DOWNHOLE TUBING ROTATORS AND RELATED METHODS

摘要

Downhole tubing rotators and related methods are disclosed. A mandrel harnesses torque from a progressing cavity pump stator to which it is coupled. Operation of the pump rotor induces a torque on the pump stator, and that torque is harnessed by the mandrel. A rate of rotation of the mandrel due to the torque from the pump stator is controlled, and the rotation rate is hydraulically reduced in an embodiment. A rotation in a direction opposite to a direction of rotation of the mandrel due to the torque from the pump stator is applied to a production tubing string. The direction of rotation of the mandrel could be reduced and applied to the production tubing string by a planetary gear system, for example.

主权项

1. A downhole tubing rotator comprising:
a mandrel to be coupled to a progressing cavity pump stator; a rotation control module coupled to the mandrel, to control a rate of rotation of the mandrel due to torque applied to the mandrel by the progressing cavity pump stator; an anchor module coupled to the mandrel to anchor the downhole tubing rotator to a well casing; a rotation reversing module coupled to the mandrel, to apply to a tubing string a rotation in a direction opposite to a direction of rotation of the mandrel due to the torque applied to the mandrel by the progressing cavity pump stator; a swivel module to be coupled to the tubing string to allow the tubing string to rotate independently of the anchor module.