Mud-Operated Rotary Steerable System with Rolling Housing
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Solution Overview
Problem
Current directional drilling systems face challenges in achieving precise three-dimensional control of drill bit direction, particularly in navigating complex geological formations and maintaining directional accuracy during drilling operations.
Innovation Solution
A mud-operated rotary steerable drilling system that utilizes drilling fluid pressure to control the position and rotation of a housing with radially extendable borehole engagement members, which can be extended or retracted to push the drill bit off-center and control the direction of the borehole, combined with a control system that uses sensors and a processor to determine the desired drilling direction and adjust the engagement members accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mud pressure actuation system is used to control borehole engagement members, then three-dimensional directional control of drill bit is achieved, but device complexity increases
Solution Approach 1:
The patent employs a mud pressure actuation system that utilizes hydraulic pressure from drilling fluid to extend and retract borehole engagement members. This hydraulic mechanism enables precise three-dimensional directional control of the drill bit by selectively engaging members in different radial directions, resolving the contradiction by using fluid pressure to achieve complex control functionality without proportionally increasing mechanical complexity
Solution Approach 2:
The borehole engagement members are designed to be dynamically extendable and retractable via the mud pressure actuation system, allowing the drilling device to adapt its configuration in real-time. This dynamic capability enables three-dimensional directional control while maintaining a relatively simple base structure, as members can be engaged or disengaged as needed rather than requiring all control mechanisms to be permanently active
2Measurement precision
If control system with sensors and processor is implemented, then directional accuracy is improved, but device complexity increases
Solution Approach 1:
The control system incorporates sensors that detect the position and orientation of the drill bit, feeding this information back to a processor. The processor then adjusts the mud pressure actuation system to correct any deviations from the desired drilling direction. This feedback loop improves directional accuracy by continuously monitoring and correcting the drilling path, while the automated control reduces the need for complex manual intervention systems
3Adaptability or versatility
If borehole engagement members are extended to push drill bit off-center, then directional control is achieved, but force required increases
Solution Approach 1:
The borehole engagement members are segmented into multiple individual units that can be extended or retracted independently. Rather than requiring one large forceful member, the system can distribute the directional control function across multiple smaller members, each exerting less individual force but collectively achieving the desired directional control through coordinated action
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
Enables full three-dimensional directional control of the drill bit, allowing for precise deviation and formation of straight or curved borehole sections, improving drilling efficiency and accuracy by dynamically adjusting the engagement of borehole engagement members based on real-time data and desired drilling profiles.
Implementation Method 1
a mud pressure actuation system that controls fluid flow through the through port to control movement of the borehole engagement members
Data Source
AI summary
A directional drilling device for drilling a borehole having a borehole wall, the device including an outer housing and a driveshaft selectively rotatable with respect to the housing and including an axial flow bore and a through port formed in the driveshaft wall. The device also includes one or more borehole engagement members rotatable with and radially moveable with respect to the outer housing toward engagement with the borehole wall to urge the directional drilling device in a radial direction with respect to the borehole. The device further includes a mud pressure actuation system. The mud pressure actuation system controls fluid flow through the through port to control hydraulic pressure on a piston device and thus movement of the borehole engagement members into engagement with the borehole wall to maintain a rotational position of the outer housing and the corresponding radial direction in which the device is being urged.