BENT-HOUSING TURBODRILLS IMPROVE HARD-FORMATION DIRECTIONAL DRILLING

Leo Koot, Koos Koole Shell U.K. Exploration & Production Lowestoft, England Tom Gaynor Neyrfor-Weir Ltd. Aberdeen, Scotland 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.

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