Method for reducing drilling torque in the drilling of a deviated wellbore
A method is described for the rotary drilling of a deviated wellbore with a drill string formed with a plurality of sections of drill pipe and a drill bit at the lower end thereof lying along the lower side of the deviated wellbore. The method comprises: (a) rotating the drill pipe against the friction provided by the lower side of the wellbore as the drill pipe drags along the lower side of the wall of the wellbore during the drilling of a deviated wellbore. The deviated wellbore is inclined to such an extent that the entire weight of the drill string rests on the lower side of the wall of the wellbore and the drill string does not slide along the wellbore under its own weight, and (b) rotating the drill bit oppositely of the rotation of the drill pipe such that the torque utilized for rotating the drill bit subtracts from the torque otherwise required for the rotation of the drill pipe.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4643264
- OSTI ID:
- 6759348
- Country of Publication:
- United States
- Language:
- English
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