Wellbore percussion adapter and tubular connection

摘要

A percussion adapter that is driven to generate a percussive axial motion on a wellbore structure. One percussion adapter includes a drive connection to mechanically convert rotational drive to axially directed percussive motion. Another percussion adapter employs a valve that creates back pressure causing axially directed percussive motion. A wellbore tubular connection transitions torque to resist back off when left hand or right hand torque is applied.

主权项

1. A method for accelerating the drilling penetration of a rotary driven drill bit, the method comprising:
coupling a drilling accelerator to a rotor of a positive displacement motor the rotor being rotatable and the drilling accelerator including:
a housing,a shaft coupled to the rotor and rotatable by the rotor,a bit box sub moveable relative to the housing, anda cam assembly having a first cam surface coupled to the housing and a second cam surface coupled to the bit box sub, wherein the first cam surface and the second cam surface are moveable relative to each other between a first configuration and a second configuration; anddelivering fluid through the motor to rotate the rotor and the shaft, thereby moving the cam assembly from the first configuration to the second configuration, thereby lifting the shaft and the housing away from the bit box sub; and continuing to deliver fluid through the motor to rotate the rotor and the shaft, thereby moving the cam assembly from the second configuration to the first configuration, thereby enabling at least one of (a) the shaft impacting the bit box sub and (b) the first cam surface impacting the second cam surface, the impacting generating axial percussive force;
wherein the shaft impacting the bit box sub generates the axial percussive force;wherein during impacting, the first cam surface is spaced from impact with the second cam surface.