Downhole Rotating Connection for Differential Rotation
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Solution Overview
Problem
Downhole drilling tools face challenges in efficiently managing rotational independence between components and effectively communicating data across differentially rotating parts, leading to complexity, wear, and reduced reliability in drilling operations.
Innovation Solution
A downhole connection system featuring a rotating member and an independently rotating member, where a solenoid is rotationally fixed to the independently rotating member, and a moving member is connected to an actuation valve, allowing for differential rotation rates and communication through selective activation of the solenoid to actuate the moving member and control downhole tools like mud pulse generators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If components are rotationally independent to enable differential rotation, then adaptability and functionality are improved, but device complexity increases
Solution Approach 1:
The system is divided into distinct rotational segments: a drill string rotating at a first rotational rate and a bottom hole assembly rotating at a second rotational rate. This segmentation allows each component to rotate independently at different speeds, enabling differential rotation while maintaining manageable complexity through modular design
Solution Approach 2:
A rotational joint acts as an intermediary connection between the drill string and bottom hole assembly. This intermediate component facilitates differential rotation by allowing torque and rotational motion to be transmitted while accommodating different rotational rates between the two components
2Strength
If mechanical connections are used between rotating components, then structural integrity is improved, but wear increases and reliability decreases
Solution Approach 1:
The system replaces traditional mechanical drive shafts and gear connections with a rotational joint that transmits torque through controlled slip. This substitution reduces mechanical wear by allowing relative rotation between components while maintaining torque transmission, thereby improving reliability in the harsh downhole environment
3Loss of information
If data communication is implemented across differentially rotating parts, then information transfer capability is improved, but system complexity and difficulty of detection increase
Solution Approach 1:
Data communication is achieved through periodic modulation of the rotational joint's operation. By encoding information in the periodic engagement and disengagement of the rotational joint or in periodic variations of torque transmission, the system enables data transfer across differentially rotating components while maintaining relatively simple detection mechanisms at the surface
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 reduces wear, increases reliability, and simplifies the drilling system by allowing independent rotation and data communication between differentially rotating components, enhancing drilling efficiency and accuracy.
Implementation Method 1
A solenoid is rotationally fixed to the independently rotating member and a moving member is connected to the rotating member. The moving member is movable by the solenoid
Data Source
AI summary
A downhole connection includes a rotating member and an independently rotating member. A solenoid is connected to the independently rotating member and a moving member is connected to the rotating member. The moving member is movable by the solenoid and connected to an actuation valve of a downhole tool on the rotating member.