Segmented Load Shoulder for Wellhead Tubing Support
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Solution Overview
Problem
Existing load shoulder technologies for wellheads are inadequate for supporting heavy and lengthy tubing strings, as they either limit load capacity or require complex installation processes, especially for higher load applications.
Innovation Solution
An annular load shoulder system comprising three arc-shaped segments with engagement members, which are installed by rotating them to align with a second circumferential groove, providing a secure and flexible support mechanism within a wellhead, allowing for higher load capacities and simplified installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional welded or grooved load shoulder is used, then the structure is simple and installation is straightforward, but the load capacity is insufficient for heavy and lengthy tubing strings
Solution Approach 1:
The load shoulder is divided into multiple segments that can be independently installed and positioned within the wellhead. Each segment contains engagement members that interface with corresponding features in the wellhead, allowing the distributed load to be effectively transferred to the wellhead structure while maintaining high load capacity for heavy tubing strings
Solution Approach 2:
The segmented load shoulder components are designed to be nested within the wellhead structure during installation. The segments fit into designated spaces and lock into position through engagement members, creating a compact integrated assembly that provides high strength without excessive external dimensions
2Strength
If a high strength steel segmented load shoulder is used, then the load capacity increases, but the installation process becomes more complex requiring set screws or pins
Solution Approach 1:
The engagement members on the load shoulder segments are designed to self-align and self-lock into corresponding features within the wellhead during the installation process. The segments automatically position themselves correctly as they are lowered into place, eliminating the need for additional fastening operations with set screws or pins while maintaining the high load capacity provided by high strength steel construction
3Ease of operation
If an installable load shoulder with flexibility features is used, then the installation through smaller diameter bore is easier, but the applicability for higher load applications is limited
Solution Approach 1:
Dividing the load shoulder into segments enables both installation flexibility and high load capacity. The segmented design allows the components to be maneuvered through the smaller diameter bore in a stepwise manner, while the use of high strength steel material and proper engagement member design ensures the assembled structure can support heavy and lengthy tubing strings
Data Source
AI summary
A system for supporting tubing with an installable load shoulder. The system includes a wellhead formed with an enlarged first circumferential groove in the wall of the vertical bore of the wellhead, and a second circumferential groove extending upwardly or downwardly from the first circumferential groove. At least one opening is formed in communication with the second circumferential groove. An annular load shoulder is received within the first circumferential groove, and has an inner surface adapted to support a tubing hanger. The load shoulder is formed from at least three arc-shaped shoulder segments adapted to be received within the first circumferential groove. At least one of the shoulder segments has an engagement member configured to pass through the opening to be received within the second circumferential groove. Rotating the load shoulder such that the engagement member is out of alignment with the opening secures the load shoulder within the wellhead.