Hydraulic Damping Stabilizer for Drill String Torsional Vibration
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Solution Overview
Problem
Torsional vibrations in drill strings during drilling operations lead to incidents like twist-offs, back-offs, and component failures, affecting the structural integrity and accuracy of drilling operations.
Innovation Solution
A drilling apparatus with a stabilizer device that incorporates hydraulic damping mechanisms to mitigate torsional vibrations, featuring circumferentially slidable stabilizing members and a hub with fixed blades and movable pads that engage the borehole wall, providing transient anchor points for damping forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic damping mechanisms are added to mitigate torsional vibrations, then vibration mitigation effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent combines the stabilizer device with the hydraulic damping mechanism into a single integrated assembly. The stabilizer members are mounted directly on the drill string, and the hydraulic dampers are incorporated into the same structure, allowing both stabilization and vibration damping functions to be performed by one combined device rather than separate components.
Solution Approach 2:
The stabilizer device serves multiple functions: it provides lateral stabilization by engaging the borehole wall, and simultaneously acts as a mounting structure for the hydraulic damping mechanisms. This multi-functional design allows a single device to address both stabilization and torsional vibration mitigation needs.
2Reliability
If stabilizer members are made circumferentially slidable to provide transient anchor points, then vibration damping capability is improved, but ease of operation deteriorates
Solution Approach 1:
The stabilizer members are designed with circumferential slidability, allowing them to dynamically adjust their position along the drill string during rotation. This dynamic capability enables the stabilizers to engage and disengage from the borehole wall as needed, providing transient anchor points that adapt to varying vibration conditions while maintaining operational functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces torsional vibrations by applying counter-vibrational torque, enhancing the structural integrity and stability of the drill string, thereby preventing failures and improving drilling accuracy.
Implementation Method 1
hydraulic mechanisms to dampen such vibration
Implementation Method 2
movable pads that engage the borehole wall to provide transient anchor points for damping forces
Data Source
AI summary
A well tool apparatus for damping torsional vibration of a drill string comprises stabilizing members projecting radially outwards from a housing that is, in operation, rotationally integrated in the drill string, to stabilize the drill string by engagement with a borehole wall. The stabilizing members are displaceably mounted on the housing to permit limited angular movement thereof relative to the housing about its rotational axis. The well tool apparatus includes a hydraulic damping mechanism to damp angular displacement of the stabilizing members relative to the housing, thereby damping torsional vibration of the housing and the connected drill string, in use.