Wellbore percussion adapter and tubular connection
First Claim
Patent Images
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; and
delivering 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.
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Accused Products
Abstract
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.
27 Citations
12 Claims
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1. A method for accelerating the drilling penetration of a rotary driven drill bit, the method comprising:
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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, and a 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; and delivering 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A drilling accelerator comprising:
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a housing; a rotatable shaft; a bit box sub moveable relative to the housing; and a 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; and rotation of the rotatable shaft moving the cam assembly from the first configuration to the second configuration, thereby lifting the rotatable shaft and the housing away from the bit box sub; and
continued rotation of the rotatable shaft 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 in the drilling accelerator;wherein the rotatable shaft impacting the bit box sub generates the axial percussive force; wherein when the rotatable shaft impacts the bit box sub, the first cam surface is spaced from impact with the second cam surface. - View Dependent Claims (10, 11)
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12. A drilling accelerator comprising:
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a housing; a rotatable shaft; a bit box sub moveable relative to the housing; and a 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 relatives to each other between a first configuration and a second configuration; and rotation of the rotatable shat moving the cam assembly from the first configuration to the second configuration, thereby lifting the rotatable shaft and the housing away from the bit box sub; and
continued rotation of the rotatable shaft 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 earn surface impacting the second earn surface, the impacting generating axial percussive force in the drilling accelerator;wherein the bit box sub is axially moveable in the housing between a compressed position with the first cam surface and the second cam surface in contact and an in-tension position where the second cam surface is spaced from the first surface and the cam assembly is unable to move between the first configuration and the second configuration.
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Specification