Drillstring sub cuts torque and casing wear
- Security DBS, Aberdeen (United Kingdom)
- Pilot Drilling Control, Lowestoft (United Kingdom)
A new downhole tool, the drillstring torque-reducing sub, minimizes torque losses and reduces casing wear in extended reach drilling. This drillstring sub effectively reduced torque losses and helped improve torque transfer to the bit on some of the extended reach wells drilled on BP Exploration`s Miller development in the UK North Sea. Problems with excessive torque during drilling of the Miller field template wells led to a concurrent engineering design and testing program to develop a tool to minimize torque losses. When available technology was judged inadequate to solve these problems, a torque-reduction sub was designed, tested, and used in this series of critical, high-angle, deep, platform wells. The paper discusses the background of the problem, the drill pipe leaving sub, the Lo-Torq sub, nonrotating protector, low-torque drill pipe, the drill string torque reducing (DSTR) sub, DSTR sub spacing, laboratory tests and results, Miller trials, casing wear results, and future developments.
- OSTI ID:
- 382936
- Journal Information:
- Oil and Gas Journal, Journal Name: Oil and Gas Journal Journal Issue: 42 Vol. 94; ISSN OIGJAV; ISSN 0030-1388
- Country of Publication:
- United States
- Language:
- English
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