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Produtos de segurança personalizados fornece respostas para um problema antigo. Nós fabricamos as pastilhas de tração anti-derrapante originais para as diferentes áreas de trabalho no piso da plataforma. Não seja enganado por imitações inferiores. Desde 1979, mais de 8000 plataformas de perfuração e mais de 800 clientes em todo o mundo usaram o design criado por Custom Safety Products, Inc. Este design inclui o padrão familiar e padrão de sulco, bem como o método exclusivo de quebra-cabeças de fechamento de mitades rotativas . Vencedor do Prêmio Especial Especial de 1991 para Inovação de Engenharia, Produtos de Segurança Personalizados continua a melhorar o Safety Pad, com novas variações para diferentes aplicações. Nossos tapetes de uretano de alta densidade são moldados personalizados para se adequarem a qualquer área em uma plataforma de petróleo, incluindo: Tabelas giratórias Drillers Consoles Monkeyboards Steps Racks de tubos Floira completa de pisos Ao comparar sistemas de tapete, certifique-se de obter o melhor produto disponível. Safety Pad II FR: Dura 2-3 vezes mais do que a concorrência Mais de 35 anos de experiência no campo de petróleo Mais de 800 clientes amplificador 8000 plataformas em todo o mundo Personalizado moldado para caber, com ou sem patches conhecidos Padrão retardador de fogo Garantia limitada de dois anos Pesquisas revelam que nossas almofadas foram reduzidas Lesões de queda-queda 99. Mantenha-se com o original, e você pode ter certeza de que está trabalhando na superfície de trabalho não-deslizante número um no patch de óleo. Por favor, explore nosso site para ver mais de nossos produtos. Custom Safety Products, Inc. é um representante autorizado da Advanced Mat Systems e da Safeguard Technology. Todos os outros produtos consultados neste site são fabricados pela Custom Safety Products, Inc. em Friendswood, Texas, EUA. Nossos clientes AB International AB Lotos Geonafta ABC Oilfield Rental AES Electrical Supply Inc. ASW Well Service A. W.I. INC. A ampG Services Aban Abraham Ltd. Abraj Energy Services Abu Dhabi Suprimentos industriais Ace Supply Acção Produtos amplo Serviços Acumen International Adcor Nicklos Drilling Adghal Oilfield Supplies LLC Adkins Internacional Adobe Oilfield Services Adriatech srl. Advanced Energy Advanced Mat Systems Advanced Rig Services LLC Agip EUA, Inc. AL Masaood Indústria de petróleo Suprimentos amp Services Co. AL Mazroui Trading amp Serviços gerais Alaska United Drilling Alexander Ryan Marine All45Points Equipment Co. Allied International Allison Brothers Drilling Co. Allmon Serviços Alpha Hunter Drilling LLC Alpha Oilfield Supply Alton International Pte Ltd. Amerada Hess American Block Co. Amortecedor americano Amplo equipamento American Rig Tool Empresa Amoco Produção Co. Amossco EUA, Inc. Anadarko Argélia Corporation Angelo Fleet Amp. Industrial Fornecedor Angola Deepwater Drilling Empresa Apache China PT Apexindo Pratama Duta Tbk. Appalachian Drilling Applied Machinery Corp. Arabian Metals Co. Serviços Aramco Arbuckle Drilling Arco Alaska Arctic Alaska Drilling Arethusa Offshore Co. Arethusa Yorktown Arrow Supply Co. Inc. Artecol Supply Aseon AS Serviços Associados de Petróleo Astanient S. A. de C. V. Atco Drilling, Inc. Atlantic Drilling Atlantic Oilfield Services Atlantic Onshore Services BV Atlantic Pacific Marine Corporation Atlas Perfuração 45 Austrália Atlas Drilling, LLC Atlas Oilfield Supply Company Atom Supply Atwood Oceanics Automotive amp General Supply Co. Awilco Perfuração Axon Rig Concept ampDesign AS Axxis Drilling Inc Aztec Well Servicing B45G International BHL International, Inc. BKE Shelf Ltd. BMH Perfuração BMW Drilling amp Exploration B. Hansen, Inc. BP America Production Co. BP Exploration Ltd. BSI Drilling amp Workover, Inc. Baerfield Drilling LLC Baguley Engenharia Bailey45Shannon Perfuração Baker Ferramentas de óleo Baldwin Oilfield Baleros Amp. Equipos De Tampico Óleo Báltico América do Norte Bariven Corporation Serviços básicos de energia Basin Drilling Basin Supply Inc. Bastar Resources Bawden Drilling Bayard Drilling Beacon Maritime Inc. Bear Supply Bear Well Service Bechtel Beck Oilfield Beckman Production Services, Inc. Bentec GmbH Bersal Energia Beta Offshore Big quot6quot Empresa de perfuração Big Chief Empresa de perfuração Blackbrush Energia Blackhawk Especialidade Ferramentas Blake International Rigs LLC Blake Workover amplificador Drilling Blocker Perfuração Blue Line Drilling Co. LLC Blue Wings LLC Boart Longyear Drilling Services Boldon Drilling Boloil Bomac Drilling Bon Accord Texas Inc. Booker Drilling Boom Drilling Bovard Supply Boyles Branda Oilfield Products Branham Industries Brazos Serviços Técnicos, Inc. Brightek, Inc. Brinkerhoff45Signal Offshore British Drilling amp Freezing Company Bro Nco Drilling Bronco Manufacturing, Inc. Brotex International Metals LLC Broughton Offshore Limited Butler45Johnson Drilling Company C amp T Marketing Corporation CFG Specialty, Inc. CK Suprimentos Industriais CK Loosebrock EUA CNT Safety, Inc. CRC Colorado Well, Inc. CRC Mallard, Inc. CSMC Oilfield Sales Cactus Drilling Cactus International, Inc. Cal Pacífico Perfuração Campeche Jackup SA De DV Canadian Marine Drilling Canamco Serviços suprimentos de ampères Canelson Drilling Inc. Canmar 45 Leitura amplificador Bates Ltd. Cannon Oil amp Bom serviço de poço de gás Canton Drilling Canyon Drilling Capstar Drilling Caroil Caspian Drilling Empresa Caza Drilling Caza Drilling Califórnia Cendrill Supply Ltd. Challenger Bit Service Challenger Equipment amp Tool Chaparral Energy Charles E. Bearden Drilling Company Fornecimento de Cheques Cheyenne Drilling Chiles Offshore, Inc. Chuan Huat Internacional (s) Pte Ltd. Cimarron Companhia Operacional Companhia de Perfuração de Barras de Círculo Cleanblast LLC Cleere Drilling Company Clipper Energy Supply Co. Coasta L Drilling Colorado Well Service Columbia Oilfield Supply, Inc. Columbia Valve Supply Soluções de perfuração completas Conoco, Inc. Construssiones Industriales y Ecologicas 124 Del Sureste, S. A. de C. V. Continent Projects Technologies Pte Ltd Continental Drilling Company Continental Emsco Co. Control União Testing amp Inspecção BV Conval Oilfield Services Pte Ltd. Cooper Fabricação Core Óleo Amplificador Gas Corporacion de Fomento de Produção Cougar Perfuração Crawford Fornecimento Elétrico Crown Forragem Crown Energia Ciclone Drilling DB Drilling D. B.C. Enterprises, Inc. DC Sales, Inc. DHS Drilling DRC International, Inc. DS Serviços Pertoleros S. A. de C. V. DSME (Daewoo Shipbuilding amp 124 Marine Engineering Co. Ltd.) DXP Enterprises, Inc. Daiichi Jitsugyo (América), Inc. Dalian Shiheng Trading Co. Ltd. Dalma Energy amp. LLC Dan45Tex International, Inc. Dannenbaum LLC Deep Drill Equipment Delta Empresa de perfuração Derrick amp Kelly Tool Company Deutag Nederland BV Diamond Offshore Diamond Onshore, Inc. Empresa de perfuração de diatomada Discovery Industrial Services Ltd. Distribuição NOW Dixilyn45Field Drilling Dolphin Drilling Ltd. Dolphin45Titan International Dome Petroleum Limited Dooley Tackaberry, Inc. Doyon Drilling Dreco, Inc. Broca Pro Incorporated Drillfor SA Equipamento de perfuração Especialidades Drillmec Inc. Drillmec SpA Drilltech BVI Ltd. 45 Colômbia Companhia de perfuração dupla Durkee Drilling, Inc. Dynamic, Inc. Grupo de compras ECS EDC Romfor Eagle Fornecimento de navios East African Drilling Ltd. Eastern Well Rigs Pty Ltd. Ecco Perfuração Egyptian Drilling Company El Dorado Drilling Company Electronica Y Comunicaciones SA de CV Elite Drilling Company Ltd. Eljay Drilling Corporation Emeco Supply Pte Ltd. Emil S. Werring ENAP (Chile) 45 Empresa Nacional Del Petroleo Serviços de Equipamentos de Energia Pte Ltd. Energia Exportação Energia Corporativa Corporativa Produção de Energia Amp. De Oleodutos Fornecimento Energia Putra Perkasa Recursos de Energia ampliação, Inc. Pesquisa de energia Empresa de perfuração Energy Ventures Int. Ensco Offshore Ensco Empresa Operadora Ensign International Energy Services Ensine Estados Unidos Drilling Entrada International Inc. Recursos de Equipamentos International Equity Drilling Company Erazo Valencia S. A. Erik W. Andersen AS Essar Gujarat Ltd. Exalo Drilling S. A. Exeter Drilling Company Exportação de perfuração internacional. LLC Export Oilfield Supply Perfuração de bobinas extremas Exxon Mobil FWA Drilling Company Falcon Drilling Faris International Felderhoff Brothers Drilling Ferrostaal Texas, Inc. Fidelity Exploration amp Production Co. Five Star Rig amp Supply Fluor Drilling Services Flux O. S. Sdn Bhd Foramer Foratex, Inc. Comércio Exterior Exportação Foritalia Forward Pass Supply Forwest, Ltd. Franklin Offshore Caspian Ltd. Freeport45McMoran Sulphur LLC Frigstad Offshore Pte Ltd. Fronteira Drilling Gaffney45Kroese Supply Corp. Garvimex S. A. de C. V. Gator Supply Co. Geod Drilling Equipment amp Supply George Boyd amp Co. Global Air Support, Inc. Global Industrial Ltd. Perfuração marítima global Goober Drilling Grace Offshore Grave Divisão do sudoeste Graham Group plc. Grand Rig International Inc. Greatship (Índia) Ltd. Greatwall Drilling Co. (Tailândia) Ltd. Forragem de lobo cinzento Fornecimento de lobo cinzento Griffin Alexander Grup Servicii Petroliere Costa do Golfo Produtos de campo petrolífero Perfuração do Golfo Forte de perfuração do Golfo Internacional Óleo do Golfo HB International Company, Inc. HampH Supply Hacker International LLC Hardie International Harpel Empresa de perfuração Harper Drilling Company Helmerich amp Payne IDC Hendra Comércio BV Henley Drilling Hercules Perfuração offshore Hersa Enterprises, Inc. Hexadyne Drilling Corporation Hickman Drilling High Arctic Energy Services Hilcorp-Alaska Hinton Drilling Hitachi Zosen Hofman Offshore (ABDN) Ltd. Hogarth Safetywear Hoogvliet EN ZN BV Hond International Co. Ltd. Horizon Energy Servies LLC Houlder Marine Drilling Ltd. Houma Distribuidores Housco Pacific Company, Inc. Houston Offshore International, Inc. Howard Supply Hudson Drilling Huthnance Divisão de Grace Hylton Drilling Hyundai Heavy Industries IDM Equipment IOT-Dosco BVIRI International Iceland Drilling Co. Ideco Dresser IMI Engineering Company Serviços de revestimento de impacto Indam International Indril, Inc. Indrill Fornecimento de Texas Industrial de Serviços ampliação Outsourcing S. A. de C. V. Infinity Marine Offshore, Inc. Inland Rentals amp Supply, LLC Innodrill LLC Integrated Drilling Equipment Co. Intelliserv, Inc. Inter-American Oil Works, Inc. Intercontinent Supply Co. Inc. Interoil Services LLC International Chandlers International Oilfield Services International Piping amp Procurement Group International Rig Equipment, LTD Ferramentas Internacionais amp Supply Company, Inc. International Trading amp Supply JB Oilfield, LLC JFP Energy J. S. Fornecimento industrial JW Gibson Drilling Company Equipamento Jacobson James Bigard Drilling Company Jardboranir HF Jaslo Oil amp Gas Exploration Co. Ltd. Jelec EUA John Energy Ltd. Joint Venture Jurong Shipyard Pte Ltd. Justiss Oil Company, Inc. KCA Deutag KCI Construstors KMC Oil Tools KS Direito Viking Ltd. Kanon Exportação e Importação Karakum Drilling LLP Keen Energy Kelley Oilfield Equipment Kenai Ltd. Keppel Fels Ltd. Key Serviços de Energia Keydril Empresa Keyes Offshore Kim Heng Marine Oilfield Pte Ltd. Knight Supply Kuwait Drilling Company L amp J Supply LLC LHR Marine LHR Serviços amp Equipment, Inc. LMJ Supply Company LTV Energy Products Labroy Offshore Engineering Pte Ltd. Lags Exploration Lamprell Energy Ltd. Lang Exploração Perfuração Lanterna Perfuração Lariat Perfuração Larsen Óleo Amplificador Gas Pte Ltd. Latco Perfuração Latshaw Perfuração Layne Christensen Co. Leeden Segurança Leonard Hudson Drilling Co. Le Tourneau Technologies Lewis Supply Company Loadmaster Universal Rigs, Inc. Lockheed Engineering Amp Science Co. Loffet Brothers Logística Internacional Lone Star Safety amp. Supply, Inc. Loosebrock Europe Trade amp Supply BV Luca Drilling Company Luke Grace Empresa de perfuração MampC Sales Co. Inc. MB Serviços de petróleo McAllen Serviços internacionais McLachlan Drilling McVay Drilling MGF Drilling Company MMA Equipment Amp Supply MND Drilling Magnum Transcontinental Corporation MST LLC Magnum Transcontinental Corporation Mallard Bay Drilling Manning Drilling Mansarovar Energia Colômbia Ltd. Mantto Offshore SA de CV Marathon Oil Company Mardrill, Inc. Marine Drilling Company Marine Technic AS Marinor Associates Hidráulica Marítima Marlin Offshore Services (Tailândia) Ltd. Martex Drilling Mason International Oilfield Supply, Inc. Matagorda Drilling Company Materiais Unlimited Corporation Mayoreo de Refacções, Motores amp Equipos, SA Mayronne Empresas Mediterranean International Mediterranean Petroleum Equipment Company Megadrill Services Meoil Mepeco srl Merkite Corporation Mermaid Drilling Mica Supply amp. Especialidades, Inc. Mid45Continent Equipment, Inc. Mid45Continent Equipment (Austrália) Midcontinent (Aberdeen) Ltd. Midcontinent (Great Yarmouth) Ltd. Midco Deutschland GMBH Midco Noruega AS Midway Tool Midwesco Mitchell Drilling MO PAC Mojo Perfuração Moller Supply Company, Inc. Montgomery Drilling Company Moranco Drilling, Inc. Murco Drilling Company Perfuração Murfin N amp. C Drilling Company NIS 45 Naftagas NSM, Inc. Nabors Drilling USA, Inc. Nabors Alaska Perfuração Nabors Loffland Drilling Na Bors Onshore Drilling Nabors Well Services Co. Nafta Sp z. o.o. National Oilwell National Oilwell (Reino Unido) National Supply Company Neddrill (Nederland) BV Nicor ​​Drilling No Limit Equipment LLC Noble Drilling Nomac Drilling Nomec, Inc. Noramco Nordrill, Inc. Nordril Supplies AG Normec Oilfield Products North Aegean Petroleum Company Norton Energy Drilling OBI Oilfield Services O8217Brien Energy OGIS Corp O8217Ryan Perfuração Oakwell Engineering Occidental Oil amp Gas Corp. Ocean Rig Operações de Angola Ocean Star Drilling Rig Ocean Wash, Inc. Oceanex Services International Odeco Odfjell Drilling Offshore Drilling Supplies, Ltd. Offshore Energy Center Offshore Rigs, LLC Oil amp Gas Exploration Empresa Oil Services amp Trading Oilfield Bearing Industries, Inc. Oilfield Equipment Components, SA de CV Oilfield Supply Pty Ltd. Oilfield Tools Supply. Inc. Oilworld Supply Co. Oncor Trading, Inc. Oneok Drilling Orinokia Supply LLC Orion Drilling Company Oro Negro Overseas Equipment Services, Inc. Serviços no exterior suprimentos de amplificadores Oyster Creek Interests LLC P amp S Supply International P. T. Dati P. T. Daya Alam Tehnik PDVSA PGX Supply LLC PISC International PRC Drilling Company PV Perfuração de serviços de poços Corp. Perfuração de energia pública Overseas Company Private Ltd. Perfuração do Pacífico Pakistan Petroleum Ltd. Panalpina, Inc. Panamerican Industrial Services, Co. Inc. Paragon Offshore Contracting GmbH Parker Drilling Partech Patman Drilling International Patriot Drilling LLC Patterson UTI Drilling Co. Pearl Exploration, Inc. Pemsa Parts amp Supply, LLC Empresa de perfuração Penrod Empresa de perfuração Peregrine Perforadora México, SA Perfuração de desempenho Pergemine spa Petra Group EUA Petra Trading Petreven Petreven UTE Petro45Equipamento Troca Petro45Express Supply, Inc. Petrobras América, Inc. Petrolera EDS Serviços de perfuração do Equador Petroleum Commercial Supply, Inc. Equipamentos de petróleo International Petroleum Supply Company Petróleo Fornecedores de tecnologia Inc. Petronas Carigali Petronas Marine SDN BHD Phillips China , Inc. Phillips Petroleum Company Pinnacle Drilling Co. Pioneer Drilling Pioneer Serviços de energia Piper International Pisc Middles East FZE Pluspetrol Pool Artic Alaska Pool Intairdril Pool Offshore Company Port Hueneme Marine amp Supply Poszukiwania Naftyi I Gazu Jaslo SP. ZO. O. Power Rig LLC Precisão de Perfuração Premier Oil Services Premium Casing Services Premium Drilling (Cayman) Ltd. Pride Offshore, Inc. Pride Oil Well Service Pride Serviços de Petróleo Process Manufacturing Corp. Procureall Limited Produtores Companhia de Abastecimento Proveeduria, Obras Y Mantenimiento S. A. de C. V. Pulliam Drilling Pyramid Drilling Co. Qualidade Elevadores Queiroz Galvao Oleo e Gas SA R amp B Falcon Drilling R ampH Equipamentos R amp H Supply R amp M Electrical R amp R Adquisição R amp. T Pacific Associates RX International Raffael Energia Rainbow Drilling Company Ram International Randolph Rig Amp Equipamento Ratliff Drilling Company Raymonds Supply Co. Ltd. Re45Cal Services Real Marine AS Real SAP APS Red Man Pipe amp Supply Redpath Offshore Reelwell Reliance Produtos industriais Remote Oilfield Services Republic Drilling amp Service, Inc. Resource Rig Supply Rhema International Riceland Drilling Ricetec, Inc Richter Drilling Pty Ltd. Equipamentos de equipamento Equipamentos de equipamentos de abastecimento AP Pte Ltd. Rig Supply AS Rio Grande Supply Co. Inc. Robroy International, Inc. Rocket Drillco Rod Ric Corp. Ross Drilling Co. Equipamentos de perfuração de campos petrolíferos rotativos International Rowan Companies, Inc SASC Japan SDS Drilling SMP Drilling SST Energy Corporation SWN Drilling Co. Sabine Universal Produtos Proteção Tecnologia Safety Concept Safety Technical Services Co. Ltd. Segurança Wrap, Inc. Safeware, Inc. Saipem Sakhalin Sako Corp Salen Protexa Perfuração Saltlake Samsung Heavy Industries San Antonio Equipment Supply, Inc. Sandia Drilling Company Santa Fe (UK) Ltd. Sapura Kencana Drilling Sauer Drilling Co. Savage Drilling Scallop Materiais Serviços Scan Drilling Scan Tech AS Scandrill, Inc. Schahin Support Services LLC Schlumberger Co. Schlumberger México Schlumberger Emirados Árabes Unidos Schlumberger Venezuela SA Scorpion Offshore Seadrill Américas Seadrill Deepwater Units Pte Ltd. Seadrill Gemini Ltd. Seadrill Intrepid de México Seadrill Management AME Ltd. Seadrill Offshore Singapura Pte Ltd. Sealy amp Co. Seamans Ltd. Seawolf Oilfield Services Ltd. Sedco, Inc. Sedco45Forex See , Inc. Sendero Drilling Serinco Drilling SA Serviço de perfuração Southwest, LLC Servyco Amplificador de distribuição Setin Tred Setter Enterprises, Inc. Perfuração de prateleira Pty Ltd. Shell Offshore Shell Oil Company Shell Western EampP Sidewinder Drilling Signal Hill Petroleum Inc. Signal Oilfield Services, Inc. Prata Oak Drilling Sky Enterprises LLC Smedvig Limited 45 Aberdeen Smedvig Offshore 45 Noruega Smedvig Offshore 45 Singapura Smedvig Services (Canadá) Ltd. Snamprogetti Arábia Saudita Soeker Soilmec Branham, Inc. Solas Serviços Marítimos Sonat Offshore Drilling Songa Offshore Pte Ltd. Sonpetrol México SA de CV South Texas Offshore Drilling Company Southern Specialties amp Supply Southern Valley Specialties Southwest Refractário da Texas Southwestern Energy Company Empresa de fornecimento de equipamentos especiais Sphere Overseas Supply, Inc. Sphere Supply, Inc. Ferramentas de produção de espelhos Estágio 3 Separação Standard Drilling, Inc. Equipamento padrão Amp. De aprovisionamento, Inc. Stanley Drilling Star Oriente Médio Star Steel amp Trading Stena Drilling Limited Stewart amp Stevenson Stoneham Drilling, Inc. Suez Oil Company Sundowner Offshore Services Sunset Serviços Superior Derrick Services, LLC Supreme Supply amp Serviços Sweetman Drilling Co. Inc. TMBRSharp TR International TRG Drilling Co. TSC Manufacturing amp Supply Tabasco Jackup SA de CV Tanda Supply LP Tasman Oil Tools Pty Ltd. Tauzin, Gary L. Tecon Oil Services Ltd. Teledyne Movible Offshore Temple Drilling Tetra Applied Technologies, Inc. Tex45Co International, Inc. Texaco, Inc. Texas Drilling Company Texas Mill République Tecnologia LLC Textrin, Inc. The Offshore Drilling Company, Inc. Thomas Kurze GMBH Thornton Drilling Thums Long Beach Company Tioman Drilling Co. Sdn Bhd Tivca Toolpusher Fornecimento Top Oil Services Total Oil Marine PLC Segurança total Total de fornecimento de serviços Totoh Rental Tower Drilling Company Tradepoints International Tradequip Services amp Marine, Inc. Trainser Trance Industries LLC Trans45M, Ltd. Transocean Transocean Cyprus Capital Mgmt Public Ltd. Transocean Offshore Deepwater Drilling, Inc. Transoceanic Netherlands Transtexas Gas Corp. Transworld Drilling Company Trend Drilling Triade Drilling Co. Tri45Service Drilling Company Trinidad Drilling Ltd. Triumph International Tropic Drilling amp Exploration True Drilling Company Tucker Drilling Turnkey EampP Corporation Perfuração da Toscânia International Two R Drilling UMW Standard Drilling Sdn Bhd USS Oil Well Supply Company International, Inc. UTI Drilling Union Drilling, Inc. União Oil Company Unidade de perfuração United Service amp Supply Co. United Supply amp Chemical Suporte de perfuração universal LLC, LLC Unocal UK Ltd. Testemunhos A quem possa interessar, por isso, em nome de Astanient S. A. de C. V. Gostaríamos de compartilhar com prazer nossa experiência com a Custom Safety Products, Inc. (CSPI). Somos uma empresa localizada no Golfo do México no campo petrolífero de perfuração offshore. Normalmente, precisamos de piso de perfuração e tapetes. Depois de olhar para o mercado, consideramos a CSPI como a melhor opção para nós, bom tempo de entrega, produtos de alta qualidade e excelente atendimento ao cliente que responderam a cada pequena pergunta que tivemos e explicamos amplamente todos os pontos importantes no processo de compra. Nossa experiência com CSPI é completamente satisfatória. Recomendamos os seus produtos e serviços. Oswaldo A. Perez Aco. 124 Comprador. Para: Kendall Kinchen, Custom Safety Products A Kendall, as novas esteiras de chão de design, sem os parafusos prisioneiros, superaram as nossas expectativas. O ambiente difícil que encontramos no campo de Baaken é desafiador em todos os aspectos. Condições de inverno apresentam oportunidades para uma queda de deslizamento em uma base constante. O fluido de perfuração utilizado é quotinvertquot um tipo de base de óleo que combinado com temperaturas sub-zero pode ser muito liso. Nós equipamos todas as nossas plataformas Bakken com seus produtos. Isso nos permitiu a todos, mas eliminamos as quedas de deslizamento no chão da plataforma. Os únicos comentários de nossos funcionários eram que os parafusos de aço eram duros em botas e joelhos. Os novos tapetes de design resolveram esses tópicos. Nossa decisão de colocar as tiras de racking nas plataformas frias do país foi uma decisão sábia. Não tivemos um único problema de cobertura de gelo desde que os instalamos. O fluido de perfuração, a neve e a água drenam a cada vez. O fluido de perfuração drena para os lados onde nossas panelas de drenagem pegam o fluido. A maior vantagem tem sido para nossos funcionários. Se tropeçar tubulação ou tubo de retaguarda na tração da porta-V não é um problema e não tivemos um incidente. No campo petrolífero moderno, a segurança é um valor central. Fazer um investimento para manter um ambiente de trabalho seguro é uma obrigação. O equipamento que adquirimos da Custom Safety Products tem mais que pago por si mesmo através da redução de acidentes na frota de perfuração. Kendall, graças a você e seus funcionários por ajudar a proteger nossos funcionários. Matt Smith 124 Gerente de compras e gastos 124 Bronco Drilling Company Inc. Estamos orgulhosos de endossar seu produto e sua empresa. Compramos os primeiros tapetes para as nossas plataformas há mais de 25 anos e continuamos a fazê-lo por cada uma das nossas 20 plataformas. Nós tentamos um tapete de importação feito de algum tipo de material reciclado há cerca de 5 anos, mas rapidamente começou a curvar-se e criou um perigo de viagem no nosso piso da plataforma. Nós também adquirimos as suas estampas e esteiras de centro que sustentaram, bem como as esteiras rotativas. Na Scandrill Inc., apreciamos o relacionamento de longo prazo e a sua vontade de reparar ou substituir seções perdidas ou anos de tapete danificados e anos após a data de compra original. The Performance Driven Drilling Contractor of Choice na região de Ark-La-Tex Paul Mosvold 124 Vice-Presidente 124 SCANDRILL Inc. 124 11777 Katy Frwy Suite 470 124 Houston, TX 77079 A Custom Safety Products forneceu uma esteira de broca que é satisfatória para os requisitos da empresa . Depois de perguntar a vários gerentes de qual vendedor vender as esteiras, a única resposta foi C. S.P. Isso fala muito sobre os resultados que este tapete produziu, uma vez que não havia até uma sugestão de pesquisar outros fornecedores. Robert Belair 124 Ensco International O departamento de segurança e gerenciamento de operações deseja agradecer-lhe por nos apresentar o bloco de segurança I e o bloco de segurança II. Desde a nossa introdução ao pad em 1980, quando nosso primeiro grande equipamento foi para o trabalho, adquirimos 11 almofadas para nossas plataformas. Fomos muito satisfeitos com as almofadas a durabilidade da almofada e a prevenção da não deslizamento com a superfície antiderrapante e os sulcos fizeram a diferença. Podemos dizer honestamente que não tivemos um acidente grave ou grave no chão da plataforma que resultou em alguém escorregando, torcendo os joelhos ou caindo no chão do equipamento. Podemos contribuir com vários fatores por que a almofada de segurança tem sido um grande atributo para nossas plataformas. Um produto durável não usa e detém todos os tipos de aditivos químicos e de lama de perfuração. A superfície antiderrapante evita o deslizamento dos pés. Os sulcos profundos ajudam os homens a terem um pé direito ao puxar escorregas ou ao encaixar pinças em tubos de perfuração. Fácil de manter limpo e pode ser ressurgido sem tempo de inatividade para o equipamento. Dá aos homens uma almofada mais macia nos pés. Elimina a fadiga corporal quanto à colocação em grades de aço duro. Um recurso de segurança adicional ao apresentar a plataforma para o trabalho. Nós só queríamos que você soubesse que, nos últimos cinco anos, ficamos muito satisfeitos por ter essas almofadas de segurança em nossas plataformas e continuaremos a usá-las. E o motivo para comprar essas almofadas é ajudar a evitar acidentes no piso da plataforma. Obrigado novamente por um bom produto. Roland 124 Diretor de Segurança 124 Booker Drilling Company, Inc. Nosso primeiro Safety Pad II foi instalado no Rig 13 em novembro de 1981. Desde então, o Rig 13 registrou mais de 700 dias de operação e a almofada ainda fornece uma superfície de trabalho resistente a deslizamento em torno da Mesa rotativa. Como você sabe, continuamos comprando o Safety Pad II até que todas as nossas 17 plataformas baseadas em terra fossem equipadas. Estou convencido de que o Safety Pad II foi um dos investimentos em equipamentos de segurança da plataforma mais sábios e rentáveis ​​que fizemos. Eu não identificei uma única lesão, onde a base insegura em torno da mesa rotativa foi a principal causa ou uma causa contributiva, onde o Safety Pad II estava em uso. Eu acredito que o fotograma seguro que a almofada fornece é um importante fator que contribuiu para a redução de 69 nos nossos acidentes incapacitantes incidente taxa de 1981 a 1984. Eu não hesitaria em recomendar o Safety Pad II, se adequadamente dimensionado e instalado, como um efetivo Dispositivo de segurança em plataformas de perfuração de poços de petróleo e gás. Gus 124 Basin Drilling Corp. Houston Offshore International gostaria de agradecer a instalação experimental do Safety Pad II em nossas unidades móveis de perfuração offshore, Sabine I e Sabine IV. Os supervisores da fábrica afirmam que têm várias vantagens que os tornam um ativo para o piso da plataforma. Primeiro, o Safety Pad II reduz os incidentes de deslizamento e queda praticamente nula. Os funcionários são capazes de manter a tração em torno da mesa rotativa, mesmo que possa estar molhado ou coberto com fluidos de perfuração. Tempo de viagem, ambos entrando e saindo do buraco são reduzidos até trinta (30) minutos por viagem, o que equivale a uma hora por ida e volta. Em segundo lugar, os custos operacionais da plataforma são reduzidos na medida em que não é mais necessário usar papel de cobertura ou tapetes de coco como superfície antiderrapante. A superfície da almofada de segurança, mesmo após o período de teste de 90 dias, parece não ter desgaste da superfície. Bob 124 Coordenador de Segurança e Treinamento 124 Houston Offshore International 9 de fevereiro de 1984 Com base em boa experiência e declarações positivas para o produto am do pessoal de perfuração no WEST VANGUARD, adquirimos o Safety Pad II também para WEST VENTURE. A bordo do WEST VANGUARD, utilizou-se aproximadamente 10 meses. Podemos também acrescentar que, durante este período, não houve uma única lesão na cauda deslizante na mesa rotativa. Finn 124 Inspector de Segurança 124 STATOIL Drilling 9 de fevereiro de 1984 O SAFETY PAD II em torno da mesa rotativa foi colocado em serviço em 17 de janeiro de 1983. Deve ser um dos melhores encontrados no mercado. Estamos extremamente satisfeitos com isso, e não foi danificado. Subjugado a um tratamento muito áspero. O abaixo-assinado apresentou-o no WEST VENTURE, tendo visto isso em uso no VILDKAT, onde eles também usam lama à base de óleo. Dá um pêndulo extremamente bom e, apesar dos derramamentos de lama à base de óleo, aumentou a segurança para os trabalhadores. O uso de outros remédios, como cascas de parede, etc., não tem o mesmo efeito. Estes estão se dissolvendo e podem causar problemas aos rolamentos de esferas para o roteador. O abaixo-assinado é altamente recomendado. Inge 124 STATOIL 7 de fevereiro de 1983 Tivemos o Safety Pad II a bordo de 17 de abril de 1983. A equipe do WEST VANGUARD está muito satisfeita com isso. Tem uma superfície um pouco áspera com um padrão quadrado aproximado de 20 x 20 cm no topo. Além disso, existem alguns pequenos espigões de aço que ficam aproximadamente 5 mm. Isso dá uma boa fricção aos pés. Após um uso de quase um ano inteiro, dificilmente pode-se ver qualquer desgaste na almofada. Normalmente, os tubos pesados ​​ou as estacas de perfuração não são colocados no tapete, mas outros equipamentos pesados, como os XO pesados, caíram sobre ele, sem danificá-lo. O abaixo-assinado também viu o Safety Pad II em uso no DR NORDSKALD (GLOMAR BISCAY 2). Lá, também foram armazenados tubos de limpeza na almofada, sem causar nenhum dano. Por 124 Chefe do Departamento de Perfuração 124 STATOIL Gostaria de chamar sua atenção para o status do Safety Pad que a Grace Offshore Company adquiriu nos últimos 8 anos. Como uma empresa de perfuração envolvida em atividades diárias no chão da plataforma e as pessoas que usam seus corpos para torcer, girar, girar e usar suas costas enquanto tropeçam dentro e fora do furo e pinças de trava, sua almofada de segurança II tem sido um grande trunfo para nós ao longo dos anos. Não podemos recordar quaisquer acidentes ou incidentes graves que tenham resultado em um acidente com perda de tempo. A durabilidade da almofada ao longo dos anos com pouca manutenção, a superfície antiderrapante e os sulcos fizeram a diferença em nossa gente não escorregando e caindo no chão da plataforma. Quando temos manutenção no pad e a plataforma vai trabalhar sem ele, as ferramentas e as equipes do chão da plataforma querem saber onde a almofada de segurança, isso só nos diz que nosso dinheiro foi bem gasto para um produto que entrou no mercado apenas Há 8 anos, quando nos apresentamos pela primeira vez. Nós, da Grace Offshore, queremos agradecê-lo por trazer este produto à nossa atenção e que qualquer outro equipamento que funcione sem ele terá um, o mais cedo possível. Obrigado novamente por um bom produto. Roland 124 Diretor de Segurança 124 Grace Offshore Company 14 de janeiro de 1983 Estamos impressionados com os desempenhos de seu produto e pretendemos fornecer cada uma de nossas plataformas com uma como permissões orçamentárias. Pete 124 Gerente de Administração 124 Peter Bawden Drilling Inc. Eu queria escrever você para informar o quanto nós apreciamos seu produto, Safety Pad II. Eu conversei com os toolpushers em ambos os engates e a maioria dos homens que temos no Gulfdrill que estão usando isso. Todos me disseram que é a melhor maneira que eles já viram controlar o problema de escorregar em uma mesa rotativa enlameada. A partir de supervisores de segurança, parece que está funcionando melhor do que eu pensava. Nós quase eliminamos todos os nossos acidentes no chão devido a quedas ou deslizando com a almofada de segurança. As reivindicações das lesões que estávamos tendo foram até um ponto agora que o pad quase pagou por si mesmo. Quero complementá-lo novamente em seu produto. Tenho certeza de que, com o tempo, iremos ligar para uma plataforma para cada uma das nossas plataformas que temos agora. J. D. 124 Supervisor de treinamento de amplificador de segurança 124 Nordrill, Inc. Gostaríamos de expressar nossa opinião sobre as esteiras em torno da mesa rotativa. As esteiras oferecem muito bom equilíbrio mesmo com lamas à base de óleo. As esteiras oferecem mais estabilidade de base, ajudando a manter a produção no máximo. As esteiras ajudam a manter os acidentes baixos, devido ao menor deslizamento. It is in our opinion that floor mats would be of great concern around rotary table and drill floors. All crews on Continental Drilling Co. Rig 3 would like to thank the company for providing the rotary table mat on this rig, and would like to have these mats around floor as well. Bill 124 Continental Drilling Co. January 19, 1982 Your request for accident information in regards to our using your Safety Mats is, I am certain, an honest one. So with this in mind, I will give you an honest answer and it is that we at AWI have nothing but praise for your product. We not only feel it has reduced our slip and fall accidents to zero wherever we install your mats, but our employees morale has also greatly improved. As you are well aware, we did not limit your mats to the rig floor area, but also on the monkey boards to help improve footing for the derrickmen. In conclusion, since we installed your safety mats on ten of our eleven rigs, we have not had one slip related accident. Mike 124 Safety Director 124 AWI, Inc. Copyright copy Custom Safety Products, Inc. 2015Drilling rig monitoring system US 4616321 A In a drilling rig of drill depth conventional structure, parameters of interest (e. g. rate of penetration and drill bit location, number of stands, monkey board position) are calculated and displayed by a unified electronic system. A weight transducer measures the load of the drill string on the rig. A movement sensor provides information on movement of the hook. An internal clock provides time signals. The relevant parameters are calculated using a microprocessor from these three factors. (10) 1. In a drilling rig having a derrick including a crown block having a fast line pulley and a travelling block operable to lift pipe lengths to assemble and disassemble a drill string, and a rotary table engageable with the drill string to rotate it, an improved instrumentation system comprising: a weight transducer mounted to provide a weight signal which is a function of the weight of the drill string on the rig a sensing means for providing at least a movement signal representative of the amount of movement of the travelling block, said sensing means detecting the movement of the crown block fast line pulley clock means providing a timing signal calculating means connected to receive the weight signal, the movement signal and the timing signal to calculate therefrom the weight on bit and rate of penetration said calculating means having a memory for storing data defining the relationship between the length and weight of the drill string, said calculating means including means t o calculate true drilling depth from the weight signal, the movement signal and said stored data and a unitary display means responsive to said calculating means to make all of said signals and the calculations calculated by said calculating means available to an operator, wherein the sensing means comprises a plurality of magnet means substantially inwardly disposed with respect to the rim of the fast line pulley and equispaced about said fast line pulley, and a sensor unit also substantially inwardly disposed with respect to the rim of the fast line pulley responsive to passage of said plurality of magnet means, said sensor unit including further means for producing a pulse signal representative of said movement signal and a signal indicative of the direction of movement. 2. The system of claim 1, further including input means disabling the weight signal during addition or removal of pipe. 3. The system of claim 1, in which the sensing means detects rotation of a drill pipe hoisting pulley. 4. The system of claim 1, including means detecting movement of the travelling block and supplying a signal representative thereof to the calculating means, the latter including means to produce an alarm signal if the travelling block approaches unduly closely to a fixed part of the system. 5. The system of claim 1 where said sensor unit includes three magnetic field detectors sequentially disposed adjavent said fast line pulley where actuation of the detectors in a first sequence is representative of movement of the travelling block in a first direction and actuation thereof in a sequence opposite to that of said first sequence is representative of movement of the block in a second direction opposite to that of the first direction. 6. In a drilling rig having a derrick including a crown block having a fast line pulley and a travelling block operable to lift pipe lengths to assemble and disassemble a drill string, and a rotary table engageable with the drill string to rotate it, an improved instrumentation system comprising: a weight transducer mounted to provide a weight signal which is a function of the weight of the drill string on the rig sensing means for providing at least a movement signal representative of the amount of movement of the travelling block, said sensing means detecting the movement of the crown block fast line pulley clock means providing a timing signal calculating means connected to receive the weight signal, the movement signal and the timing signal to calculate therefrom the weight on bit and rate of penetration said calculating means having a memory for storing data defining the relationship between the length and weight of the drill string, said calculating means including means to calcu late true drilling depth from the weight signal, the movement signal and said stored data and a unitary display means responsive to said calculating means to make all of said signals and the calculations calculated by said calculating means available to an operator, wherein said sensing means comprises paint markers substantially inwardly disposed with respect to the rim of the fast line pulley and equispaced about said fast line pulley, and a paint nark photocell detector unit also substantially inwardly disposed with respect to the rim of the fast line pulley responsive to the passage of said marks, said photocell detector unit including further means for producing a pulse signal representative of said movement signal, and a signal indicative of the direction of movement of the travelling block. 7. The system of claim 6 where said photocell detector unit includes photosensitive detectors sequentially disposed adjacent said fast line pulley where actuation of the detectors in a first sequence is representative of movement of the travelling block in a first direction and actuation thereof in a sequence opposite that of said first sequence is representative of movement of the block in a second direction opposite to that of the first direction. 8. The system of claim 6, further including input means disabling the weight signal during addition or removal of pipe. 9. The system of claim 6, in which the sensing means detects rotation of a drill pipe hoisting pulley. 10. The system of claim 6, including means detecting movement of the travelling block and supplying a signal representative thereof to the calculating means, the latter including means to produce an alarm signal if the travelling block approaches unduly closely to a fixed part of the system. This invention relates to a system for acquiring operational data in a drilling rig. In conventional oil drilling rigs, data is acquired and displayed by separate instruments for the various parameters of interest. The instruments used are electromechanical or purely mechanical, and they have poor accuracy and low reliability in the arduous conditions usually present in drilling rigs. The system of the present invention is based on the need in the oilwell drilling field for a reliable, accurate and trouble free drilling instrument. During the past, and even up to the year 1979, drilling instruments commercially available were mechanical-hydraulic or mechanical-electronic systems such as those produced by Martin-Deckar of San Anna, Calif. Totco of Norman, Okla. and Geolograph of Oklahoma City, Okla. The majority of sensors utilized by such instruments contained mechanical movement which is subject to wear and tear or complete failure due to the environmental conditions normally encountered in the drilling industry. U. S. Pat. No. 4,156,467 (Patton et al) shows one form of electronic instrumentation, using sensors which are located at the draw-works drum and utilise the Hall-effect to detect magnetic markings which are fastened to the flange of the drum. However, sensing the magnetic strips attached to the flange of the drawworks drum is only good in theory. Configuration of drawworks is different with different manufacturers. Normally the rim is not easily accessible. Installation of the magnetic strips will mean practically dismantling the drawwork which is not acceptable practice. During normal operation, the lubricant from the drilling line builds-up on the magnetic strip and the Hall-effect sensors, and consequently affects its effectiveness. The rims of the drawworks drum are not machined surfaces so attaching magnetic strip cannot be carried out satisfactorily, and the distance between the sensors and the strip can vary more than a Hall-effect sensor sensing distance. Furthermore, using the layer of cable and the cable diameter, etc. (disclosed in Patton et al) as factors of depth measurement again is not practical. The cable is not necessarily wound on the drum uniformly every time and any wear on the cable can effect the measurement. It is more practical to have the depth sensor mounted on the crown block and sense the movement of the fast line pulley because the fast line pulley is readily accessible on almost any type of drilling rig. Furthermore, it is not likely for the sensor to get knocked off in normal operation and the tar oil normally used for drilling line lubrication will not build up in the sensing area. Normally no modification is required on the fast line pulley. The probes simply sense the spokes or holes normally existing on the pulley or simply attached small metal pieces on the side. All of the above represent a practical and workable method. By using this method, the system of the present invention can be installed in almost any drilling rig and provide maintenance free and trouble free data gathering. With the improvement of drilling techniques, looking for oil in more hostile geographical areas and the introduction of new safety legislation, the conventional drilling instrumentation with its fundamental handicaps is not able to fulfill the requirements. The system of the present invention is unique from any other system in that it provides a practical approach in the method of sensing the information, the installation of sensors and the method in which it presents the vital drilling information to the operator. It offers the driller reliable information which requires no human interference during normal operation. The installation is simple, practical and easily accessed it will not foul-up due to the environmental factor in simple terms it is a drillers tool, it is practical and it works well. An object of the invention is to provide a significant improvement on known arrangements, and to provide an integrated electronic system with no (or very few) moving parts. A further object is to provide drilling data which cannot be obtained by existing instruments. The invention accordingly provides, in a drilling rig having a derrick including a crown block and a travelling block operable to lift pipe lengths to assemble and disassemble a drill string, and a rotary table engagable with the drill string to rotate it, an improved instrumentation system comprising: a weight transducer mounted to provide a weight signal which is a function of the weight of the drill string on the rig sensing means arranged to provide a signal representative of movement of the travelling block clock means providing a timing signal calculating means connected to receive the weight signal, the movement signal and the timing signal to calculate therefrom the weight on bit and rate of penetration said calculating means having a memory for storing data defining the relationship between the length and weight of the drill string, said calculating means further being arranged to calculate true drilling depth from the weight signal, the movement signal and said stored data an d a unitary display means arranged to make all of said signals and parameters available to an operator. The system also provides detection of approach of the elevator (travelling block) to a fixed part of the rig structure, such as the monkey platform, and the crown block and to an alarm in response thereto. The invention will now be described in more detail, referring to the accompanying drawings, in which: FIG. 1 shows a diagram of the system of the present invention used in conjunction with conventional drilling apparatus FIG. 2 is a block diagram illustrating one embodiment of the invention FIG. 3 is a side view of a crown block assembly carrying a sensor used in the system of FIG. 1 FIG. 4 is an end view of the crown block assembly of FIG. 3 and FIG. 5 illustrates a drillfloor unit used in the system of FIG. 1. Referring to FIG. 1, the conventional drilling apparatus comprises a crown block assembly 70 which supports a travelling block 64. A dead line anchor 66 is operated to lower and raise the travelling block 64. A number of drill pipes 74 are attached to the travelling block 64 via a Kelley 75. The pipes 74 are rotated by means of a rotary table 72 and a slip 80. A driller collar 78 and a drill bit 76 are located at the remote end of the drill pipes 74 for drilling through the earth formation 82. The system of the present invention is based on a computer 10 utilising a microprocessor of known type, suitably a Z80 microprocessor by Zilog. The computer 10 receives signals from a depth sensor 12, a weight sensor 14, an elevator sensor 15, a tong torque switch 19 and rotary table speed sensors 16,18 and 20, and processes these to provide drilling data to output peripherals. The weight sensor 14 is installed at the dead-line anchor 66 or at the crown block 70 to give a signal representative of the load of the entire drill string acting on the drilling rig. Information such as hook load, weight on bit, number of stand and accurate depth measurement can then be obtained. The weight sensor 14 may suitably be a strain guage. The elevator sensor 15 is installed near the moving path of the travelling block 64, to check and reset its position. This is especially important when the cable in the pulley assembly has slipped and cut after it has worn to the limit. By installing this elevator sensor 15 the travelling block 64 is monitored at all times. Therefore information like monkey board position, crown alarm and crown stop can be obtained and dangerous block collisions can be avoided. The tong torque switch 19 is provided to sense the usage of the tong. This is also a unique feature of the present drilling computer system. By using this signal, together with the weight and depth signals and the computer memory, the computer 10 can establish precisely and automatically the status of the process: whether it is a drilling process or a tripping process or a non-drilling related function. Rotary-table speed sensors 16,18 and 20, located at the rotary table 72 are included in the drilling computer system to sense the turning rate of the drillbits for controlling or optimizing the speed of drilling through a given earth formation. The depth sensor 12 is illustrated in greater detail in FIGS. 3 and 4. The depth sensor is installed at the crown block assembly 70 of the drilling rig derrick near the fast line pulley 24a. This location is readily accessible for installation of the sensors normally no dismantling of machinery or modification is required. The crown block assembly 70 includes a base 22 secured to the drilling derrick, and pulleys 24 independently rotatable on a pulley shaft 26 journalled in the base 22, as is conventional. The sensor 12 is secured to the base 22 adjacent the fast line pulley 24a, and comprises three magnetic proximity detectors, or photo-cell mark detectors 28,30,32 which produce output pulses when passed by mild steel pieces 34 secured to the adjacent face of the fast line pulley 24a. There are suitably eight pieces 34 equispaced about the pulley 24a, the positioning being such that the distance D12D2sin 22.5 the distance D2 is not critical and can conveniently be 400-500 mm. Eight strips of white paint are used as marks in place of mild steel pieces when using the photo-cell marker detector. Instead of attaching steel pieces 34, the magnetic proximity detectors can sense spokes or holes, where these are present in the fast line pulley. The centre detector 30 is used to provide datum pulses which can be switched with the pulses from the detectors 28, 32 to distinguish forward and reverse movement. Thus the sensor 12 provides an output to the computer 10 comprising (1) a signal distinguishing forward and reverse, and (2) a pulse signal wherein each pulse indicates a unit of distance travelled by the travelling block, and the pulse rate indicates the speed of movement. The depth sensor is unique it uses three sensing probes and is arranged in such a way that only the logic of 1-2-3 represents the up movement and 3-2-1 represent the down movement. No misrepresentation is possible with this simple method, rather than using magnetic strip and Hall-effect sensor. The sensors are proximity sensors. They sense the target at a greater distance and can sense any piece of metal, therefore no precise alignment is necessary. A duplicate sensor 12a is provided as a standby. The above signals are processed by techniques known per se in the computer 10, together with time signals generated by an internal clock, to generate parameters of interest as detailed below. (1) True drilling depth is derived by reading movement of the crown block pulley and accumulating the total for downward movement only. The total depth thus derived is a nominal depth equal to the unstretched length of the drill string. The microprocessor of the present apparatus is provided with memory and program data to allow a corresponding algorithm to be performed to calculate true depth for immediate display. The memorised data is suitably provided in an EPROM, which can readily be set up initially with information relevant to the specific rig. (2) Rate of penetration (ROP) is derived by dividing the drilling depth signal by time. (3) Drill bit location is derived by accumulating both upward and downward movement of the crown block pulley when under load. (4) Trip speed (i. e. the speed of the drill string while being removed from the drill hole) is derived by dividing the upward movement of the crown block pulley by time, during upward movement under load. (5) The tonmile reading of the drill line is derived from the total travel of the cable of the travelling blockcrown block assembly and the weight on the travelling block. Thus total work done on the cable is measured, which is vital for evaluation of the safe life of the cable. (6) Hook load indication comes directly from the drill string transducer signal. (7) Weight on bit (WOB) is developed by storing total hook load before the bit is at bottom and subtracting from this the instantaneous hook load. (8) Digital timer and stop watch functions are supplied by the clock circuit. The system also enables the information from the crown block sensor to be used to generate safety signals, by initially storing in the memory of the computer 10 data representing the position of the elevator relative to the monkey board and the permissible range of movement of the (travelling block) elevator relative to the crown block. Thus: (9) A signal representing the relative position of the elevator to the crown block and to the monkey board is developed from the movement of the crown block pulley and activates an alarm if the travelling block approaches within a safe limit from the crown block. The paramaters derived by the computer 10 can be output to a range of peripherals as shown in FIG. 1, such as a local VDU 50, a remove VDU 52, a printer 54, a recorder 56 (e. g. a chart plotter or a multi-track tape recorder or magnetic tapedisc recorder), and a drillfloor unit 58. The drillfloor unit, shown in greater detail in FIG. 4, is positioned on the drillfloor for use by the drilling crew. The rate of penetration is displayed by a meter 60 since this accords with traditional drillfloor practice, and the other parameters on digital displays. The availability of the computer 10 permits the monitoring of other functions to be easily added. For example, as shown in FIG. 1, the additional sensors 16,18,20 may supply the computer with speed data for the rotary table and two mud pumps, respectively, for suitable display or recording. Before drilling has begun, the travelling block weight is registered into the computer 10. The length of the drill pipe 74 is also registered, when the pipes are joined up with the drill-bit 76 and drill collar 78 at the other end. The depth sensor 12 measures the length of each pipe, the weight sensor 14 registers the weight increase during the Kelley hoist-up of the pipe to be added on. When the pipe is joined onto the length of pipe just being drilled with the tong torque being used to tighten-up the joint, using the tong trigger, the tong switch 15 in turn instructs the computer 10 to stop the process of bit depth regardless of weight changes on the travelling block 64 (hook). When the connection is completed, the travelling block 64 moves slightly upward to enable the removal of the slip 80, at the same time the total weight is applied to the hook, which is considerably larger than the travelling block weight. This instructs the computer 10 to start up-dating the bit depth measurement. When the bit depth reaches the previously drilled depth, the depth begins to up-date, as do the rate of penetration, bit time, weight on bit, etc. When the added-on length has been drilled through, the hook moves back to the previous location, the drill depth remains at the last reading, but the bit depth reads the distance above the depth. The slip is set and the hook load returns to the empty block weight. During this time the bit depth stops processing and the number of stand is increased 13 stand. When the tong torque is used to disconnect the Kelley, it further advises the computer 10 that a slip is set and no bit depth information should be processed, regardless of the hook load changes. This unique feature has proved to be very important for reliable depth measurement and prevents confusing information affecting the depth measurement. When the slip is set, and the tong has broken the connection, the Kelley is picking up a new length of pipe to join on to the previous length and the drilling process continues. The invention allows the parameters of interest to be derived from a limited number of sensors entirely without moving parts, thus giving improved reliability and low maintenance costs. Since the system replaces a number of conventional instruments, the initial cost is also competitive.