Multi-function Sub for Casing Thread Makeup with Real-time Sensing
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Solution Overview
Problem
Existing thread makeup compensator systems in oil well drilling and casing operations lack comprehensive data sensing capabilities for torque, weight, and rotational speed, limiting the efficiency and precision of casing joint makeup processes.
Innovation Solution
A multi-function sub is introduced, connecting between a casing gripper and a top drive, equipped with a thread makeup compensator, torque and tension gages, and a rotation sensing device, which provides real-time data on torque, weight, and rotational speed through an annular instrument housing with integrated circuitry and an RF transmitter, utilizing telescoping members and anti-rotation mechanisms to maintain precision during thread makeup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a traditional thread makeup compensator is used, then the casing joint can be made up, but real-time data on torque, weight, and rotational speed is not provided
Solution Approach 1:
The patent combines multiple sensing functions (torque gage, tension gage, rotation sensing gage) and thread makeup compensation into a single integrated sub assembly. This merging of previously separate components into one unified device provides comprehensive real-time data while maintaining operational efficiency in casing joint makeup operations.
Solution Approach 2:
The sub assembly is designed as a multi-functional device that simultaneously performs thread makeup compensation and provides multiple measurement functions (torque, tension, rotation). This universal design eliminates the need for separate compensators and sensors, reducing overall system complexity while enhancing information availability.
2Measurement precision
If multiple sensing gages are integrated into the sub, then comprehensive data is provided, but the device complexity increases
Solution Approach 1:
Multiple sensing gages (torque, tension, rotation) are merged into a single integrated sub assembly with common mounting structures and shared operational mechanisms. This consolidation provides comprehensive measurement capabilities while avoiding the complexity of multiple separate sensing systems.
Solution Approach 2:
The sub assembly serves multiple measurement functions simultaneously through a unified design, where a single device structure supports torque measurement, tension measurement, and rotation sensing, thereby achieving high measurement precision without proportionally increasing device complexity.
3Manufacturing precision
If the sub telescopes to compensate for thread makeup, then the casing joint can be made up accurately, but the structural complexity increases
Solution Approach 1:
The sub is divided into telescoping segments (upper and lower members) that can move relative to each other to compensate for thread makeup. This segmentation allows precise control of the makeup process while keeping each segment's structure relatively simple and manageable.
Solution Approach 2:
The sub incorporates dynamic telescoping capability where the upper and lower members can extend and retract to accommodate thread engagement. This dynamic structure enables precise makeup compensation without requiring a completely complex rigid mechanism, as the telescoping action naturally adapts to the thread makeup process.
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
The multi-function sub enhances the accuracy and efficiency of casing joint makeup by providing real-time data on torque, weight, and rotational speed, enabling better control and monitoring of the drilling process, thereby improving the overall operation of oil well drilling and casing operations.
Implementation Method 1
An external pump is connected by a line to the sleeve for supplying pressurized fluid into the sleeve, which acts against the piston to bias the upper and lower members to a contracted position
Implementation Method 2
A torque measuring gage is mounted to the sub for measuring torque applied to make up the joint of casing with a casing string
Implementation Method 3
A tension measuring gage may be mounted on the sub for measuring tension applied through the sub so that the weight of the string is known
Implementation Method 4
a rotation sensing gage may be mounted to the sub for sensing a speed of rotation of the casing joint
Implementation Method 5
Circuitry for the gages, one or more batteries and an RF transmitter may be mounted within the instrument housing
Data Source
AI summary
A multi-function sub is connected between a top drive of a drilling rig and a casing gripper. The sub has telescoping upper and lower members that rotate with each other. A sleeve is mounted to one of the members. That sleeve is prevented from rotation with the upper and lower members by an anti-rotation device. A piston is located on the other member and reciprocally carried within the sleeve. An external pump is connected to the sleeve for supplying pressurized fluid into the sleeve to act against the piston. This fluid provides compensation for thread makeup when a new joint of casing is being secured to a string of casing.