Hammered Tubular Threaded Connection With Shoulder-Nose Load Transfer
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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, making it difficult to determine final make-up and leading to impaired performance and sealing issues due to impact forces during hammering.
Innovation Solution
The threaded connection is designed with a box nose in contact with the external shoulder at final make-up, allowing for easy determination of make-up completion and redirecting impact forces through a longer radial path, incorporating hooked threads and retainer surfaces to absorb energy and protect against damage from overpressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal is provided between the engaged threaded portions and the pin nose to protect against overpressure damage, then the threaded connection is protected against overpressure damage, but the sealing performance is negatively affected by hammering impact forces
Solution Approach 1:
The invention divides the protective function into two separate mechanisms: a seal for overpressure protection and the box nose-external shoulder contact for impact force protection. This segmentation allows each component to specialize in one protective function, preventing the seal from being damaged by hammering impact forces while maintaining its sealing capability.
Solution Approach 2:
The box nose acts as an intermediary element that intercepts hammering impact forces before they can reach the seal. By positioning the box nose to contact the external shoulder at final make-up, the impact forces are redirected through this intermediary path, protecting the seal from damage while preserving its sealing function.
2Ease of operation
If the threaded connection is hammered into the ground without the external shoulder and box nose in contact, then the threaded connection can be installed, but the impact forces damage the engaged pin and box threaded portions through galling and plastic deformation
Solution Approach 1:
The invention requires that final make-up be achieved with the box nose in contact with the external shoulder before hammering begins. This preliminary action of proper make-up creates a protected load path that prevents damage to the threaded portions during subsequent hammering operations.
Solution Approach 2:
The invention converts the potentially harmful impact forces into a beneficial protective mechanism. By designing the box nose-external shoulder contact interface, the impact forces that would normally damage the threaded portions are instead redirected through this interface, protecting the threaded connections from galling and plastic deformation.
3Ease of manufacture
If the box nose is not in contact with the external shoulder during make-up, then the threaded connection can be assembled, but it becomes difficult or time consuming to determine if final make-up is reached
Solution Approach 1:
The invention creates a visible or detectable change at final make-up through the box nose contacting the external shoulder. This contact creates a distinct state that can be easily identified during make-up, providing a clear indication that final assembly has been achieved without requiring additional measurement tools or time-consuming procedures.
Data Source
Figure 1A
Figure 1B
Figure 1C
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.