Bent-housing turbodrills improve hard-formation directional drilling
- Shell U.K. Exploration and Production, Lowestoft (United Kingdom)
- Neyrfor-Weir Ltd., Aberdeen (United Kingdom)
Improvements in the design of turbine-powered downhole motors allowed steerable drilling in a hard formation at a high rate of penetration (ROP). Drilling in this dolomite formation with the rotary or with positive-displacement motors (PDMs) was slow during steering operations. Shell's solution to the steering penetration rate problems was to change the well plans if suitable directional drilling tools weren't available. Where possible, the wells were designed with the Zechstein interval drilled as a tangent section with non-steerable turbodrills. However, a better solution was the use of a steerable turbodrill-a tool unavailable on the market at that time. The paper describes motor development, a field test, and the design and operation of the motor.
- OSTI ID:
- 5938504
- Journal Information:
- Oil and Gas Journal; (United States), Journal Name: Oil and Gas Journal; (United States) Vol. 91:7; ISSN OIGJAV; ISSN 0030-1388
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
BEARINGS
CARBONATE MINERALS
CONTROL
COUPLINGS
DESIGN
DIRECTIONAL DRILLING
DOLOMITE
DRILL BITS
DRILLING
DRILLING EQUIPMENT
ENGINES
EQUIPMENT
FIELD TESTS
FLEXIBILITY
MECHANICAL PROPERTIES
MINERALS
MOTORS
NAVIGATION
OPERATION
PROCESS CONTROL
TENSILE PROPERTIES
TESTING
WELLS