Rotational Hold Down System for Drilling Torque Isolation
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Solution Overview
Problem
Traditional drilling systems experience reduced efficiency due to unwanted torque transfer to the drill string and Bottom Hole Assembly, which decreases the torque delivered to the drill bit, leading to instability and inefficiency in drilling operations.
Innovation Solution
The implementation of a rotational hold down system using bars and projections within the drilling system, which limits the rotation of the Bottom Hole Assembly and directs torque to the drill bit, thereby reducing unwanted torque transfer and enhancing drilling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a downhole motor is used to generate torque for drilling operations, then drilling power is provided efficiently, but unwanted torque is transferred to the drill string causing instability and reducing overall drilling efficiency
Solution Approach 1:
The patent extracts the harmful torque transfer from the system by introducing a torque isolation mechanism between the downhole motor and the drill string. This mechanism separates the useful function (torque delivery to the bit) from the harmful effect (torque transfer to the drill string), allowing the motor to generate power while preventing the unwanted torque from affecting drill string stability.
Solution Approach 2:
The patent introduces an intermediary torque isolation mechanism that acts as a mediator between the downhole motor and the drill string. This intermediary component allows torque to be transmitted to the drill bit for effective drilling while blocking or isolating the harmful torque that would otherwise be transferred to the drill string, thus resolving the contradiction between power delivery and stability.
2Ease of operation
If torque is transferred to the drill string during drilling operations, then the drill string rotates, but this reduces the torque available at the drill bit and decreases drilling efficiency
Solution Approach 1:
The patent extracts the harmful torque transfer pathway by implementing a torque isolation mechanism that prevents torque from being transferred to the drill string. This ensures that the full torque generated by the downhole motor is delivered to the drill bit, maximizing drilling efficiency while the drill string remains stable and does not rotate unnecessarily.
Solution Approach 2:
The torque isolation mechanism serves as an intermediary that selectively transmits torque to the drill bit while blocking torque transfer to the drill string. This mediator ensures optimal torque distribution, allowing efficient drilling operations without the loss of torque to drill string rotation.
Data Source
AI summary
Systems and methods for reducing the amount of torque transferred to the Bottom Hole Assembly and the drill string during drilling operations are disclosed. The drill string includes an optionally non-rotatable portion. A rotational hold down system is positioned at a first position on the drill string where it is not rotationally coupled to the drill string. The rotational hold down system is then moved to a second position on the drill string where it is rotationally coupled to the optionally non-rotatable portion of the drill string. In the second position, one or more bars on the rotational hold down system substantially prevent rotation of the optionally non-rotatable portion of the drill string.