Torque Transmitting Load Shoulder for Casing-While-Drilling
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Solution Overview
Problem
The existing load shoulder designs for wellbores, particularly in casing-while-drilling methods, face complexity due to the need for spring-biased dogs to transmit torque, which adds complexity and may not be suitable for small diameter wellbores, where there is inadequate space for mounting these components.
Innovation Solution
A tubular member with a load shoulder that integrates a torque transferring portion and an axial force transferring portion, allowing for direct transmission of torque and axial load through a matching profile on the BHA, eliminating the need for spring-biased dogs by using a sleeve with a load shoulder that can be parallel or inclined, and featuring helical or sawtooth configurations for efficient torque and load transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If spring-biased dogs are used to transmit torque from the casing to the BHA, then torque transmission is achieved, but the device complexity increases and space requirements are not met for small diameter wellbores
Solution Approach 1:
The patent combines the torque transmission function and axial load support function into a single integrated load shoulder structure. The tapered surface of the load shoulder serves dual purposes: it supports the axial weight of the BHA and transmits torque through friction and mechanical engagement, eliminating the need for separate spring-biased dogs and simplifying the overall BHA design.
Solution Approach 2:
The load shoulder structure performs multiple functions simultaneously: it acts as a stop for the BHA, supports axial loads, and transmits torque. This multi-functional design reduces the number of components needed and simplifies the BHA configuration, particularly benefiting small diameter wellbores where space is limited.
2Power
If spring-biased dogs are mounted in the BHA for torque transmission, then torque can be transmitted from the casing, but inadequate space exists in small diameter wellbores
Solution Approach 1:
The patent merges the torque transmission mechanism into the load shoulder structure itself, which is already present in the casing. By using the tapered surface of the load shoulder to transmit torque through friction and mechanical engagement, the design eliminates the need for additional space-consuming components like spring-biased dogs, making it suitable for small diameter wellbores.
3Device complexity
If a simple no-go shoulder is used to support the BHA, then the structure is simple, but torque cannot be transmitted from the casing to the BHA
Solution Approach 1:
The patent combines axial load support and torque transmission functions into the single load shoulder structure. The tapered surface is designed to handle both the vertical weight of the BHA and the rotational torque through friction and mechanical engagement, maintaining structural simplicity while achieving both functions.
Solution Approach 2:
The load shoulder structure serves multiple purposes: it acts as a mechanical stop for the BHA, supports axial loads, and transmits torque. This multi-functional design maintains simplicity while eliminating the need for separate torque transmission mechanisms.
Data Source
AI summary
A well drilling tool has a tubular member connected into a casing string that serves as a drill string. A load shoulder is located within the bore of the tubular member. The load shoulder has a torque transferring portion that extends from a lower terminus to an upper terminus. The load shoulder has an axial force transferring portion that faces upward. A bottom hole assembly is lowered through the casing string and lands on the load shoulder. The bottom hole assembly has a mating profile to the load shoulder so that it will be supported by the load shoulder and will receive torque transferred from the load shoulder.