Rotary steerable drilling tool
First Claim
1. A rotary steerable drilling tool, comprising:
- a tool collar comprising an interior, an upper end and a lower end, a bit shaft comprising an exterior surface, an upper end and a lower ends the bit shaft being supported within the tool collar for pivotal movement about a fixed position along the bit shaft;
a variable bit shaft angulating mechanism, located within the interior of the tool collar, comprising a motor, an offset mandrel having an upper end and a lower end and a variable offset coupling, having an upper end and a lower end, the motor attached to the upper end of the offset mandrel and adapted to rotate the offset mandrel, the upper end of variable offset coupling being uncoupleably attached to an offset location of the lower end of the offset mandrel, and the upper end of the bit shaft being rotatably coupled to the variable offset coupling;
a torque transmitting coupling adapted to transmit torque from the tool collar to the bit shaft at the fixed position along the bit shaft; and
a seal system adapted to seal between the lower end of the collar and the bit shaft.
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Abstract
The invention refers to a rotary steerable drilling tool having a tool collar and a bit shaft. The bit shaft is supported within the tool collar for pivotal movement about a fixed position along the bit shaft. Moreover, the rotary steerable drilling tool includes a variable bit shaft angulating mechanism, located within the interior of the tool collar. The variable bit shaft angulating mechanism includes a motor, an offset mandrel, and a variable offset coupling. The motor is attached to the upper end of the offset mandrel and adapted to rotate the offset mandrel. The upper end of the variable offset coupling is uncoupleably attached to an offset location of the lower end of the offset mandrel, and the upper end of the bit shaft is rotatably coupled to the variable offset coupling. The rotary steerable drilling tool also includes a torque transmitting coupling adapted to transmit torque from the tool collar to the bit shaft at the fixed position along the bit shaft. Finally, a seal system is adapted to seal between the lower end of the tool collar and the bit shaft.
58 Citations
31 Claims
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1. A rotary steerable drilling tool, comprising:
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a tool collar comprising an interior, an upper end and a lower end, a bit shaft comprising an exterior surface, an upper end and a lower ends the bit shaft being supported within the tool collar for pivotal movement about a fixed position along the bit shaft;
a variable bit shaft angulating mechanism, located within the interior of the tool collar, comprising a motor, an offset mandrel having an upper end and a lower end and a variable offset coupling, having an upper end and a lower end, the motor attached to the upper end of the offset mandrel and adapted to rotate the offset mandrel, the upper end of variable offset coupling being uncoupleably attached to an offset location of the lower end of the offset mandrel, and the upper end of the bit shaft being rotatably coupled to the variable offset coupling;
a torque transmitting coupling adapted to transmit torque from the tool collar to the bit shaft at the fixed position along the bit shaft; and
a seal system adapted to seal between the lower end of the collar and the bit shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A variable bit shaft angulating mechanism comprising:
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a motor, an offset mandrel comprising an upper end and a lower end, the motor attached at the upper end of the offset mandrel and adapted to rotate the offset mandrel, a variable offset coupling mechanism comprising an upper end and a lower end; and
a lock ring, wherein the lock ring is adapted to uncoupleably attach the upper end of the variable offset coupling at an offset location of the lower end of the offset mandrel. - View Dependent Claims (21, 22, 23, 24)
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25. A torque transmitting coupling comprising:
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a first shaft comprising a periphery;
protrusions extending from the periphery of the first shaft;
a second shaft comprising a inner surface and a ring, the ring having an inner surface and a plurality of perforations around its perimeter and surrounding the first shaft, each protrusion being aligned with one perforation of the ring; and
a plurality of cylinders each comprising a lower end, each lower end having a slot;
wherein the plurality of cylinders are located within the plurality of perforations of the ring and the protrusions enter the slot of the lower end of each of the plurality of cylinders. - View Dependent Claims (26, 27, 28, 29)
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30. A rotary steerable drilling tool comprising:
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a tool collar comprising an interior, an upper end and a lower end;
a bit shaft comprising an exterior surface, an upper end and a lower end, the bit shaft being supported within the tool collar for pivotal movement about a fixed position along the bit shaft;
a variable bit shaft angulating mechanism, comprising;
a motor;
an offset mandrel comprising an upper end and a lower end, the motor attached at the upper end of the offset mandrel and adapted to rotate the offset mandrel;
a variable offset coupling mechanism comprising an upper end and a lower end, and a lock ring;
wherein the lock ring is adapted to uncoupleably attach the upper end of the variable offset coupling at an offset location of the lower end of the offset mandrel;
a torque transmitting coupling adapted to transmit torque from the tool collar to the bit shaft at the fixed position along the bit shaft; and
a seal system adapted to seal between the lower end of the collar and the bit shaft.
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31. A rotary steerable drilling tool comprising:
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a tool collar comprising an interior, an upper end and a lower end;
a bit shaft comprising an exterior surface, an upper end and a lower end, the bit shaft being supported within the tool collar for pivotal movement about a fixed position along the bit shaft;
a variable bit shaft angulating mechanism, located within the interior of the tool collar, comprising a motor, an offset mandrel having an upper end and a lower end and a variable offset coupling, having an upper end and a lower end, the motor attached to the upper end of the offset mandrel and adapted to rotate the offset mandrel, the upper end of variable offset coupling being uncoupleably attached to an offset location of the lower end of the offset mandrel, and the upper end of the bit shaft being rotatably coupled to the variable offset coupling;
a torque transmitting coupling comprising;
a first shaft comprising a periphery;
protrusions extending from the periphery of the first shaft;
a second shaft comprising a inner surface and a ring, the ring having an inner surface and a plurality of perforations around its perimeter and surrounding the first shaft, each protrusion being aligned with one perforation of the ring;
a plurality of cylinders each comprising a lower end, the each lower end having a slot;
wherein the plurality of cylinders are located within the plurality of perforations of the ring and the protrusions enter the slot in the lower end of each of the plurality of cylinders; and
a seal system adapted to seal between the lower end of the collar and the bit shaft.
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Specification