Downhole assembly
First Claim
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1. A downhole assembly for insertion into a borehole comprising a stabilizer sleeve element radially collocated about a bi-partite mandrel having an articulating and compliant metal-to-metal point of torque transfer, said stabilizer sleeve having passive and active damping mechanisms associated therewith operating upon said bi-partite mandrel and located about said articulating and compliant metal-to-metal point of torque transfer.
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Abstract
A downhole assembly for insertion into a borehole comprising an articulated mandrel, a passive and an active damping mechanism operating on said mandrel for exercising control over torsional stick-slip and further proposing an improvement over the prior art which diminishes lateral shock.
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Citations
24 Claims
- 1. A downhole assembly for insertion into a borehole comprising a stabilizer sleeve element radially collocated about a bi-partite mandrel having an articulating and compliant metal-to-metal point of torque transfer, said stabilizer sleeve having passive and active damping mechanisms associated therewith operating upon said bi-partite mandrel and located about said articulating and compliant metal-to-metal point of torque transfer.
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22. A method of controlling vibration in a downhole assembly said method comprising;
- providing a stabilizer sleeve element radially collocated about a bi-partite mandrel having an articulating and compliant metal-to-metal point of torque transfer in a borehole; and
both passively and actively damping said bi-partite mandrel about said articulating and compliant metal-to-metal point of torque transfer. - View Dependent Claims (23, 24)
- providing a stabilizer sleeve element radially collocated about a bi-partite mandrel having an articulating and compliant metal-to-metal point of torque transfer in a borehole; and
Specification