Concentric Automated Pipe Wrench for Large OD Connections
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Solution Overview
Problem
Current methods for making-up and breaking-out large diameter threaded connections in oilfield operations are cumbersome, hazardous, and time-consuming, particularly when using manual tongs, and require large, heavy machinery like power tongs for efficient torque application.
Innovation Solution
An automated pipe wrench with concentrically constrained upper and lower wrench assemblies, each with a curved segment and capable of rotating 75° to 180°, which can make-up or break-out large OD threaded connections with only a portion of a rotation, eliminating the need for extensive machinery and manual labor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual tongs are used to make-up large diameter threaded connections, then the operation can be performed with simple equipment, but the process is time-consuming and hazardous
Solution Approach 1:
The patent replaces manual mechanical tong operations with an automated pipe wrench system that uses a motorized drive mechanism. The automated wrench applies continuous rotational force through a gear system, eliminating the need for manual handling and winching operations while significantly increasing making-up speed and reducing hazards associated with manual tong operations.
Solution Approach 2:
The automated pipe wrench system performs the making-up operation autonomously once positioned on the pipe. The motorized drive system automatically applies the necessary torque and rotation to complete the threaded connection without requiring continuous manual intervention, making the system self-sufficient for the making-up process.
2Productivity
If power tongs are used to apply high torque to large diameter connections, then efficient making-up can be achieved, but the machinery becomes large, heavy, and expensive
Solution Approach 1:
The pipe wrench system is divided into separate functional modules: a motorized drive unit, a gear transmission system, and gripping jaws. This segmentation allows each component to be optimized independently and assembled only when needed, reducing the overall weight and complexity compared to a full-size power tong while maintaining the necessary torque application capability for large diameter connections.
Solution Approach 2:
The automated pipe wrench is designed to handle the specific task of making-up threaded connections on large diameter pipes without requiring the excessive capacity of a full-size power tong. The system applies just enough torque and rotational control needed for the connection process, eliminating the need for oversized machinery while maintaining efficient making-up performance.
3Loss of time
If multi-start threads are used to reduce rotation angle, then fewer rotations are needed for make-up, but the connector design becomes more complex
Solution Approach 1:
The patent compensates for the increased complexity of multi-start thread connectors by using an automated motorized drive system. The automated wrench provides precise control and sufficient torque to handle the more complex connector geometry, eliminating the need for manual operators to master the increased complexity while still benefiting from the reduced rotation angle required by multi-start threads.
Data Source
AI summary
A pipe wrench for making-up or breaking-out a threaded connection between a first tubular member and a second tubular member includes an upper wrench assembly with a pair of upper jaw assemblies configured to grip the first tubular member and a lower wrench assembly with a pair of lower jaw assemblies configured to grip the second tubular member. The upper and lower wrench assemblies are concentrically constrained, axially overlap, and radially engage with one another. Each of the upper and lower wrench assemblies independently includes a frame with a curved segment containing an arc at an angle of about 160° to about 200°. The upper and lower wrench assemblies are configured to rotate the first tubular member relative to the second tubular member and can have an angle of rotation in a range from about 75° to about 180°.