Coiled tubing - Operations and services
- Imperial Oil Resources Ltd., Calgary, Alberta (Canada)
Drilling with a continuous (rather than jointed) drill string is an old concept that is gaining new attention as a result of recent advances made in coiled tubing and drilling technology. The development of larger diameter, reliable, high-strength coiled tubing and smaller diameter, positive displacement motors, orienting tools, surveying systems and fixed cutting drill bits have given drilling with a continuous drill string a capability that was previously unattainable. Like its many other uses, (e.g., squeeze cementing, wellbore cleanouts, flow initiation, logging) the continuity of coiled tubing gives it several advantages over conventional drill strings. These include: drilling underbalanced safely, significantly reduced trip time, continuous circulation, smaller surface requirements. Coiled tubing drilling operations have smaller surface lease requirements than most conventional rigs due to the smaller footprint of the coiled tubing unit and associated equipment. Current coiled tubing drilling operations have the following limitations: conventional rig assistance is required for well preparation; conventional rigs must assist in running long protective and production casing strings or liners; hole sizes are smaller; working depth capabilities are shallower, coiled tubing life is less. This paper goes on to discuss the history of continuous drill strings and includes information on tubing units, circulating systems, drilling fluids, well control systems, downhole tools, orientation tools, and bottomhole assemblies. It then gives a cost comparison and an application of this type of drilling.
- OSTI ID:
- 6512042
- Journal Information:
- World Oil; (United States), Journal Name: World Oil; (United States) Vol. 214:4; ISSN 0043-8790; ISSN WOOIAS
- Country of Publication:
- United States
- Language:
- English
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COMPARATIVE EVALUATIONS
COST BENEFIT ANALYSIS
DESIGN
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
ECONOMIC ANALYSIS
ECONOMICS
ENHANCED RECOVERY
EQUIPMENT
EVALUATION
NATURAL GAS WELLS
OIL WELLS
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TECHNOLOGY ASSESSMENT
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