Hooked Threaded Connection for Hammered Tubular Make-Up and Sealing
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Solution Overview
Problem
Existing threaded connections for hammering interconnected tubular members into the ground for hydrocarbon exploration and production are prone to damage, difficulty in determining final make-up, and impaired sealing due to hammering impacts.
Innovation Solution
A threaded connection design featuring hooked threads with radial interference, contact between the pin nose and external shoulder at final make-up, and absence of seals between engaged portions, allowing impact forces to be transferred through the external shoulder and box nose, with energy absorption and protection against deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal is provided between the engaged threaded portions and pin nose to protect against overpressure damage, then protection against overpressure is improved, but the threaded connection becomes more complex and the seal may be damaged by hammering impacts
Solution Approach 1:
The patent removes the seal from the threaded connection structure between the engaged threaded portions and pin nose. By extracting this component, the design eliminates the complexity associated with seals while relying on the inherent structural design of the hooked threads and box nose to provide protection against overpressure and hammering impacts.
2Reliability
If hooked threads with radial interference are used to transfer impact forces through the external shoulder and box nose, then protection against hammering damage is improved, but the threaded connection structure becomes more complex
Solution Approach 1:
The patent employs hooked threads with curved geometry that provide radial interference between the pin and box members. The curved thread profile allows impact forces to be redirected through the external shoulder and box nose, transforming the force transmission path to protect the threaded portions while using the geometric form itself rather than additional protective components.
3Measurement precision
If the box nose is positioned to contact the external shoulder at final make-up, then final make-up detection is improved, but the threaded connection structure becomes more complex
Solution Approach 1:
The patent designs the box nose and external shoulder to automatically contact each other at final make-up, creating a self-indicating mechanism. This geometric arrangement allows the components themselves to signal when proper engagement is achieved, eliminating the need for separate detection devices or complex indication 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
Ensures reliable final make-up detection, protects against damage from hammering impacts, and maintains sealing integrity by absorbing energy and preventing deformation, enhancing the structural integrity of the threaded connection.
Implementation Method 1
the pin threaded portion and the box threaded portion comprise hooked threads providing radial interference between crests of the pin threaded portion and roots of the box threaded portion
Implementation Method 2
the threaded connection is configured to have the box nose in contact with the external shoulder at final make-up... allows that one can determine during rotational make-up of the threaded connection when final make-up is achieved... protects against damage from hammering impacts, and maintains sealing integrity by absorbing energy and preventing deformation
Data Source
AI summary
A threaded connection for hammering interconnected tubular members into a ground, such as onshore land, for exploration and production of a hydrocarbon well, said threaded connection comprising a pin member comprising an external shoulder, a pin nose and a tapered pin threaded portion located between the external shoulder and the pin nose, and a box member comprising an internal shoulder, a box nose and a tapered box threaded portion located between the internal shoulder and the box nose.