How to optimize motor drilling in non-deviated wells
- Dresser Security, Houston, TX (United States)
- Nabors Drilling, Houston, TX (United States)
Since the introduction of drilling with positive displacement motors (PDM) in the 1960s, considerable effort has been devoted to increasing motor life, reliability, power and efficiency. Nabors Drilling has studied vertical drilling with downhole motors extensively, and has found that a detailed hydraulics analysis combined with optimized motor-bit selection can improve the economics markedly. Many tangible and intangible benefits have been documented. To reduce bottomhole assembly (BHA) failures and improve deviation control, Nabors Drilling implemented PDMs in the 9 7/8-in. upper hole section during a recent 1-year drilling program. This interval consisted of a sandstone formation to be drilled with a tooth type bit and a shale to be drilled with a polycrystalline diamond compact (PDC) bit. BHA failures were eliminated and in turn, fishing time and costs were reduced. Deviation control was also improved.The penetration rate increased significantly, reducing operating time from 12 days to 8 days. In addition, PDMs eliminated a trip when stabilizers were used while drilling out of the casing shoe, and extended PDC bit life.
- OSTI ID:
- 5086501
- Journal Information:
- Petroleum Engineer International; (United States), Journal Name: Petroleum Engineer International; (United States) Vol. 66:2; ISSN 0164-8322; ISSN PEEID4
- Country of Publication:
- United States
- Language:
- English
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