Tubular Make-up Stencil Plate for API Thread Positioning
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Solution Overview
Problem
Current methods for determining the proper make-up of API threaded connections in oil field tubular goods are either complex, costly, or prone to errors, lacking a simple and accurate visual method to ensure proper sealing and torque positioning.
Innovation Solution
A method utilizing a tubular make-up stencil plate and a dial indicator to ensure precise positioning and torque application, eliminating the need for complex instrumentation and calibration, by using a specially manufactured stencil plate with internal threads and a dial indicator for accurate measurement of make-up loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If torque-only method is used to monitor make-up, then operational cost is reduced, but measurement precision is insufficient to distinguish quality control problems
Solution Approach 1:
A make-up indicator is introduced as an intermediary component between the pin and box members. This indicator visually displays the make-up position and torque status, providing precise measurement information without requiring complex electronic instrumentation. The indicator acts as a mechanical mediator that translates internal connection status into visible external signals.
2Measurement precision
If torque-turn method with sophisticated electronics is used, then measurement precision is improved, but device complexity and operational cost increase
Solution Approach 1:
The patent replaces complex electronic sensing and computation systems with a purely mechanical indicator mechanism. The make-up indicator uses mechanical engagement between its indicator member and the connection members to directly display torque and turn information through visual markings, eliminating the need for electronic sensors, computers, and complex signal processing systems.
3Measurement precision
If barrette method is used for visual determination, then measurement precision is improved, but ease of operation is reduced due to limited applicability
Solution Approach 1:
The make-up indicator is designed with universal applicability to work with both hooked threads and non-hooked threads. The indicator member can engage with various thread configurations through its specially designed engagement surfaces, allowing the same device to provide accurate visual indication across multiple connection types without requiring different measurement tools.
4Ease of operation
If permanent mark on OD is used, then ease of operation is improved, but manufacturing precision and time are compromised
Solution Approach 1:
The make-up indicator performs self-positioning through its engagement mechanism. As the pin and box members are made up, the indicator member automatically positions itself relative to the connection geometry, eliminating the need for pre-applied marks or external positioning references. The indicator's position is self-determined by the mechanical interaction with the threaded connection during the make-up process.
Data Source
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AI summary
A method by which threaded pipe sections are connected to form a tubular joint having proper sealing positioning at proper make-up torque. This is accomplished by manufacturing a make-up stencil plate for each specific size of pipe to be coupled. The plate is manufactured at the specific taper and make-up loss of a given connection with very tight tolerance. The plate is placed on the pin pipe end of the connection. A dial indicator with a magnetic base is placed on the outer surface of the pipe pin end with the indicator flush with the end of the stencil plate. Once the indicator is set to zero, the stencil plate is removed and the coupling is installed on the pin connector hand tight. Then a bucking unit or power tong is applied to the coupling to screw the coupling onto the pin.