Torque-Dependent Oscillation for Drill String Connection
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Solution Overview
Problem
Existing methods for connecting pipe sections in drill strings face issues such as misalignment, excessive torque, and wear due to continuous rotation during connection, leading to potential damage and inefficiency in horizontal directional drilling operations.
Innovation Solution
Implementing a torque-dependent oscillation method where the inner pipe section rotates in alternating directions until a predetermined torque threshold is reached, automatically reversing direction to prevent excessive torque and ensuring proper alignment, thereby reducing wear and ensuring efficient connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If continuous rotation is applied during pipe section connection, then alignment may be achieved, but excessive torque is applied causing wear and potential damage
Solution Approach 1:
The system applies periodic oscillation between clockwise and counter-clockwise rotation instead of continuous unidirectional rotation. The carriage alternates rotation direction based on detected torque thresholds, creating a periodic action that achieves alignment while limiting total torque accumulation and reducing wear on the connection interface.
Solution Approach 2:
The system incorporates torque sensing feedback to control the rotation process. A torque sensor detects the magnitude of torque applied during rotation, and the control system uses this feedback information to determine when to switch rotation direction or stop rotation, preventing excessive torque from causing damage while ensuring proper alignment.
2Object-affected harmful factors
If torque threshold monitoring is implemented, then wear is reduced, but device complexity increases
Solution Approach 1:
The system uses a torque sensor to provide feedback on the torque applied during rotation. The control system monitors this feedback signal and automatically adjusts rotation direction or stops rotation when the torque threshold is exceeded, reducing wear without requiring complex manual control mechanisms.
Solution Approach 2:
The system performs self-regulation by automatically detecting torque levels and switching rotation directions based on pre-programmed thresholds. This self-service capability reduces wear through automated torque management without requiring external intervention or complex control systems.
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 method enhances the reliability and reduces wear on connections by applying only the necessary torque for connection, preventing damage and improving the efficiency of pipe section assembly in drill strings.
Implementation Method 1
rotating the inner pipe section in a first direction until the inner pipe section applies a first torque to the inner pipe string
Implementation Method 2
The pipe section comprises an inner pipe section and an outer pipe section, and the drill string comprises an inner pipe string and an outer pipe string
Data Source
AI summary
A method for building a dual-member drill string comprising an inner drill string and an outer drill string. Inner pipe sections are connected using non-threaded connections, while outer pipe sections are connected using threaded connections. A new inner pipe section is rotated in a first direction until the inner pipe section applies torque to the existing inner pipe string. If the magnitude of the torque applied to the inner pipe string exceeds a pre-determined threshold value, the inner pipe section is automatically rotated in an opposite second direction. The inner pipe section rotates between opposite directions, once torque is sensed in each direction, until the inner pipe section is coupled to the inner pipe string.