Method and apparatus for directional drilling

摘要

A method of and system for directional drilling reduces the friction between the drill string and the well bore. A downhole drilling motor is connected to the surface by a drill string. The drilling motor is oriented at a selected tool face angle. The drill string is rotated at said surface location in a first direction until a first torque magnitude without changing the tool face angle. The drill string is then rotated in the opposite direction until a second torque magnitude is reached, again without changing the tool face angle. The drill string is rocked back and forth between the first and second torque magnitudes.

主权项

1. A method of drilling a well, which comprises:
(a) orienting a downhole drilling motor at a selected face angle, said drilling motor being connected by a drill string to a surface drilling location; (b) rotating said drill string at said surface location in a first direction until a first measured torque magnitude is reached at said surface location; and then, (c) rotating said drill string in the direction opposite said first direction until a second measured torque magnitude is reached at said surface location.