Drillstring anchor

The drillstring anchor addresses torsional oscillations by engaging wellbore grippers and actuators to manage torque, reducing damage and maintaining drilling efficiency.

EP4479618B1Active Publication Date: 2026-05-27GA DRILLING AS
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
GA DRILLING AS
Filing Date
2023-02-14
Publication Date
2026-05-27

AI Technical Summary

Technical Problem

Existing drillstring systems experience torsional oscillations, such as stick slip, which can cause damage and poor drilling performance due to reactive torque and friction, and existing solutions that reduce weight-on-bit to prevent stick slip compromise the depth of cut and rate of penetration.

Method used

A drillstring anchor with grippers and actuators that engage with the wellbore to react torque, allowing segments to grip and release independently, and a drive mechanism to manage longitudinal motion and rotation, reducing torsional oscillations while maintaining drilling efficiency.

Benefits of technology

The drillstring anchor effectively mitigates torsional oscillations, preventing damage and maintaining drilling performance by managing torque and allowing for efficient depth of cut and rate of penetration.

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Abstract

A drillstring anchor for reacting torque from a drillstring to a wellbore, the drillstring anchor comprising: a channel for receiving a downhole portion of a drillstring so as to be rotationally engaged therewith; multiple segments disposed along the drillstring anchor, each segment comprising a respective gripper and a respective actuator capable of being driven to cause the respective gripper to adopt at least one of (a) a first state in which it is urged outwardly for gripping the wellbore and (b) a second, passive state, the gripper of at least one segment being actuable independently of the gripper of at least one other segment; the multiple segments comprising a first segment and a second segment coupled to each other so as to permit relative longitudinal motion therebetween.
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Citation Information

Patent Citations

  • Drill Bit with Self-Adjusting Pads

    US20140311801A1

  • A regulating device and a method of using same in a borehole

    WO2016122329A1

  • Downhole equipment

    GB2307495A

  • Automatic drilling system

    US3497019A

  • Directional drilling pipelay

    US4700788A