Backpressure Valve Seal Testing Mechanism
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Solution Overview
Problem
Existing backpressure valves in drilling systems do not enable seal testing during installation, leading to increased time and effort in the installation process due to the need for separate trips to verify the valve's functionality.
Innovation Solution
A backpressure valve system that includes a body with first and second seal pistons, allowing for axial movement to align a test passage and form a test chamber, enabling fluid to be pumped through for seal testing before uncoupling and withdrawal, thus reducing installation steps and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing backpressure valves are installed without seal testing capability, then the installation process requires separate trips to verify valve functionality, but this increases the number of trips and installation time
Solution Approach 1:
The patent incorporates a seal testing mechanism that allows the running tool to perform seal testing on the backpressure valve during the installation trip itself, before the valve is fully set and before the running tool is withdrawn. This preliminary action eliminates the need for a separate retrieval trip to test the valve, thereby reducing installation time while ensuring reliability.
Solution Approach 2:
The running tool is designed with multi-functionality, serving both to install the backpressure valve and to test its seal functionality. By integrating the seal testing capability into the installation tool, the system eliminates the need for separate operations, reducing the number of trips required and improving overall installation efficiency.
2Reliability
If existing backpressure valves require separate trips for seal testing, then valve functionality can be verified, but the number of trips and installation steps increase
Solution Approach 1:
The patent merges the seal testing operation with the installation operation by integrating a test passage and test chamber into the backpressure valve body. The running tool simultaneously performs both installation and seal testing functions, combining what were previously separate operations into a single integrated process, thereby improving productivity.
Solution Approach 2:
The seal testing is performed as a preliminary action during the installation trip itself, before the running tool is withdrawn. This allows functionality verification to be completed as part of the installation process rather than requiring a separate retrieval trip, thus improving installation efficiency.
3Productivity
If backpressure valve seal testing is performed during installation, then the number of trips is reduced, but the device complexity increases due to additional components
Solution Approach 1:
The patent employs a nested structure where the test passage and test chamber are integrated within the existing backpressure valve body. The seal piston moves within the valve body to control the test passage, and the test chamber is formed using existing valve components. This nesting approach minimizes additional external components while enabling seal testing functionality.
Solution Approach 2:
The sealing mechanism is segmented into multiple seal pistons (first seal piston and second seal piston) that can move independently to control different aspects of the sealing and testing process. This segmentation allows for precise control of the seal testing operation while using compact, integrated components within the valve body.
Data Source
AI summary
A system including a backpressure valve (BPV) system configured to mount in a hydrocarbon extraction system, wherein the BPV system includes a body comprising a vent port and a test passage, and a plunger configured to form a seal with the body around the vent port wherein the BPV system is configured to test the seal by pumping a fluid into the body through the test passage.