Well System Valve Segmentation for High-Pressure Seal Integrity
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Solution Overview
Problem
Existing wellhead valves, such as Back Pressure Valves and Two-Way Check Valves, suffer from seal deformation and failure due to interference of external threads with seal seating grooves, leading to inadequate sealing and potential extrusion under pressure, which is exacerbated by operator-dependent torque application.
Innovation Solution
The design incorporates a valve body with a helical thread segment for engagement, a circumferential groove for a toroidal sealing member, and a threadless positive stop ring to ensure proper seating and prevent over-torque, enhancing the lower pressure surface area and providing a clear stop for precise installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external threads are used for valve engagement, then connection strength is improved, but seal deformation and failure occur due to thread interference with seal seating grooves
Solution Approach 1:
The valve body exterior surface is divided into three distinct segments: a first segment with helical threads for engagement, a second segment with a circumferential groove for the sealing member, and a third threadless segment intermediate between them. This segmentation isolates the threads from the seal seating groove, preventing thread interference while maintaining both connection strength and seal integrity.
2Ease of operation
If operator-dependent torque application is used, then installation flexibility is maintained, but seal failure increases due to excessive or insufficient torque
Solution Approach 1:
The valve body's third segment provides a positive stop that automatically limits the engagement depth during installation. This self-limiting feature eliminates the need for operator judgment on torque application, preventing both excessive and insufficient torque while maintaining installation simplicity. The valve self-regulates its own installation parameters through the mechanical stop.
3Device complexity
If threads extend into seal carrier grooves, then structural compactness is achieved, but seal extrusion and failure occur under pressure
Solution Approach 1:
By dividing the valve body into three segments with the third segment being threadless and intermediate between the threaded first segment and the grooved second segment, the design prevents threads from intruding into the seal carrier groove. This maintains structural compactness while eliminating the root cause of seal extrusion under pressure.
4Area of stationary object
If seal seating groove is reduced to accommodate threads, then space efficiency is improved, but sealing capability deteriorates due to inadequate lower pressure surface area
Solution Approach 1:
The segmentation of the valve body exterior surface allows the seal seating groove to maintain its full required dimensions without thread interference. The third threadless segment acts as a buffer zone, ensuring adequate lower pressure surface area for reliable sealing while preserving overall space efficiency through compact arrangement of the three segments.
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 improved valve design ensures reliable sealing and prevents seal extrusion, maintaining integrity up to 20,000 psi, eliminating the need for guesswork in installation and reducing seal failure, thereby ensuring consistent and effective pressure control.
Implementation Method 1
a second segment of the exterior surface is configured as an essentially circumferential groove to accommodate an essentially toroidal sealing member
Implementation Method 2
A first segment of the exterior surface is configured with a helical thread to engage a counter-threaded portion of the tubing hanger body
Implementation Method 3
A third segment of the exterior surface is configured to be devoid of the helical thread, the third segment being intermediate the first segment and the second segment
Data Source
AI summary
A valve for use in a hanger body of a well system comprises a valve body. The valve body comprises an exterior surface comprising three segments. A first segment of the exterior surface is configured with a helical thread to engage a counter-threaded portion of the tubing hanger body. A second segment of the exterior surface is configured as an essentially circumferential groove to accommodate an essentially toroidal sealing member. The groove comprises essentially right angle shoulders at both intersections of the groove with the exterior surface. A third segment of the exterior surface is configured to be devoid of the helical thread, the third segment being intermediate the first segment and the second segment.