Swaged Tubular Connection for Higher Tension and Torque Transfer
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Solution Overview
Problem
Existing oil field tubular connections face challenges in efficiently transferring both torque and tensile stresses while maintaining cost-effectiveness, as current methods either increase production costs or limit the performance of the connection due to inadequate design of the internal and external shoulders.
Innovation Solution
A tubular connection apparatus with a pin section having external tapered threads and a box section with internal tapered threads, where the pin member is swaged to create a controlled internal diameter before threading, allowing the mating threads to be fully contained within the reduced diameter section, and the external shoulder remains unchanged, enhancing tension and torque transfer capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the termination plane is located fully within the reduced diameter section, then tensile stress capacity is increased, but the overall connection complexity increases
Solution Approach 1:
The swaging operation is performed as a preliminary action before threading the pin member. By pre-reducing the internal diameter in the intended termination plane region before cutting threads, the structure is prepared in advance to optimize tensile stress capacity. This sequential approach integrates the diameter reduction into the manufacturing flow without requiring additional complex assembly steps or post-processing operations.
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 solution enhances the tubular connection's ability to withstand tensile and torsional loads by maximizing the cross-sectional area for tension and maintaining the external shoulder's diameter for torque transfer, thereby improving the overall performance and reducing manufacturing costs.
Implementation Method 1
a tubular body that is swaged, i.e., cold-formed, to reduce an external diameter
Implementation Method 2
external threads that are cut on the reduced diameter section
Implementation Method 3
threads which transfer tensile stresses from a box member to the pin member
Implementation Method 4
the external shoulder's capacity to transfer torque and compressive stress
Data Source
AI summary
An improved tubular connection apparatus having a pin section with external tapered threads and a box section with internal tapered threads. The tubular connection apparatus uses the relationship between an internal surface diameter and a transition region to create a connection that utilizes both a mating external shoulder that has an outer diameter equal to the tube and that preferably “straddles” the transition region such that the internal pin member also retains full benefit from the formed internal surface diameter all the way to the last engaged pin thread and thereby increasing the pin member tension strength.