Active Stabilizer Torque Control for Downhole Power Generation
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Solution Overview
Problem
Directional drilling faces challenges in powering downhole tools due to limited space and unreliable power transmission through electrical wires, especially in deep and corrosive well environments.
Innovation Solution
The implementation of active stabilization systems, including rotation alteration devices and variable brakes, allows for torque control and power generation using active stabilizers in contact with the borehole wall, enabling steering and power supply for downhole equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power sources such as batteries are carried downhole, then power supply for downhole tools is achieved, but the limited space on the drill bit and associated tooling prevents effective implementation
Solution Approach 1:
The patent extracts the power generation function from the drill bit assembly by using the borehole wall itself as the power source. The active stabilizer contacts the borehole wall to generate power through relative motion, eliminating the need to carry batteries or other power sources downhole, thus resolving the space constraint while providing power supply.
2Use of energy by moving object
If electrical wires or cables are used to transmit power from surface, then power supply is achieved, but reliable transmission is difficult in deep and corrosive well environments
Solution Approach 1:
The patent uses the borehole wall as an intermediary medium to generate power locally at the drill bit. Instead of transmitting power through vulnerable electrical wires from the surface, the system uses the mechanical interaction between the active stabilizer and the borehole wall to generate electricity in-situ, eliminating the need for long electrical cable runs through corrosive environments.
3Use of energy by moving object
If active stabilizers contact the borehole wall to generate power, then power supply is achieved, but control over the stabilizer rotation is needed to manage torque and steering
Solution Approach 1:
The patent employs a variable brake system that can dynamically adjust the torque applied to the active stabilizer. This allows the system to control the rotation speed and torque of the stabilizer in real-time, optimizing power generation while maintaining steering capability and preventing excessive wear on the borehole wall.
4Manufacturing precision
If the drill string rotational radius is altered to enable active stabilization, then steering precision is improved, but additional rotation alteration devices are required
Solution Approach 1:
The active stabilizer serves multiple functions simultaneously: it provides structural support to maintain borehole shape, enables steering by contacting the borehole wall, and generates power through its rotation. This multi-functionality eliminates the need for separate rotation alteration devices, achieving steering precision while minimizing additional equipment.
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
This solution effectively generates power and steers the drill bit, overcoming the limitations of space and environmental conditions, enhancing drilling efficiency and precision.
Implementation Method 1
a variable brake configured to control a rotation of the at least one active stabilizer relative to the drilling tool
Implementation Method 2
an actuation system configured to control a torque placed on the active stabilizer through contact with a wall of a borehole
Data Source
AI summary
Active stabilization is provided. In one possible implementation a drilling tool associated with a drill bit includes one or more rotation alteration devices configured to alter a rotational radius of a drill string. The drilling tool also includes at least one active stabilizer rotatively attached to the drilling tool, as well as a variable brake configured to control a rotation of the at least one active stabilizer relative to the drilling tool. In another possible implementation, a drilling tool includes an active stabilizer rotatably coupled to the drilling tool, as well as an actuation system configured to control a torque placed on the active stabilizer through contact with a wall of a borehole.