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1. Bottom-hole assembly includes an engine, a mechanical gear box connected with the bottom-hole engine, which, after modification, can obtain the first rotary speed entrance from the bottom-hole engine; Annex II
1. Bottom-hole assembly includes an engine, a mechanical gear box connected with the bottom-hole engine, which, after modification, can obtain the first rotary speed entrance from the bottom-hole engine; Annex II
Downhole Assembly which comprises a downhole motor, a Gear Box connected to the motor Mechanical downhole Mechanical gear box that is adapted to receive an input of a First rotating speed of Rotation from the downhole motor; a Broc A rotating Cutting; Drilling method.
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