Parallel Bleed-Off Module for Tubing Casing Annulus Pressure
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Solution Overview
Problem
Newly worked-over or drilled oil and gas wells experience pressure buildup in the tubing casing annulus due to thermal expansion, which can compromise well integrity if not properly managed, posing risks of seal damage, tubing burst, or packer dislocation.
Innovation Solution
A pressure bleed-off module with parallel paths, each equipped with a pressure relief valve, pressure gauges, recorders, and isolation valves, that channels fluid from the annulus vent to the kill valve, allowing safe and controlled pressure relief while preventing backflow and environmental contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure relief valves and monitoring devices are installed to manage TCA pressure buildup, then well integrity is protected, but device complexity increases
Solution Approach 1:
The bleed-off system is divided into multiple independent paths, each with its own pressure relief valve and monitoring devices. This segmentation allows the system to manage pressure through separate channels while maintaining overall well integrity, and enables individual path maintenance without shutting down the entire system.
Solution Approach 2:
Pressure relief valves are pre-configured with set points and isolation valves are positioned in advance to automatically activate when pressure thresholds are reached. This preliminary configuration allows the system to respond automatically to pressure buildup without requiring real-time manual intervention, protecting well integrity while managing complexity through automation.
2Manufacturing precision
If multiple parallel paths with pressure relief valves are used to safely relieve pressure, then pressure control precision is improved, but device complexity increases
Solution Approach 1:
The system uses multiple parallel paths with individually adjustable pressure relief valves, each capable of being calibrated to specific pressure set points. This segmentation enables precise pressure control by distributing the pressure relief function across multiple independently controlled channels.
Solution Approach 2:
Each pressure relief valve can be independently adjusted to different pressure set points, allowing the system to control pressure with high precision by changing the operational parameters of individual valves rather than relying on a single complex valve mechanism.
3Measurement precision
If pressure gauges and recorders are installed to monitor fluid pressure, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Pressure gauges and recorders are pre-installed at strategic locations in each path to continuously monitor pressure conditions. This preliminary instrumentation allows for precise pressure measurement and automatic triggering of pressure relief valves when predetermined thresholds are reached, eliminating the need for complex real-time control systems.
Solution Approach 2:
Pressure gauges provide continuous feedback on the pressure conditions in each path, and pressure recorders document pressure trends over time. This feedback mechanism enables precise pressure measurement and automatic system response, improving measurement precision while managing complexity through automated feedback loops rather than manual monitoring.
4Adaptability or versatility
If isolation valves are installed to control fluid flow in each path, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
Isolation valves are installed in each parallel path to allow independent control of fluid flow through each channel. This segmentation provides operational flexibility by enabling operators to isolate and maintain individual paths without affecting others, and to selectively activate paths based on pressure conditions and operational requirements.
Solution Approach 2:
The isolation valves enable dynamic reconfiguration of the bleed-off system, allowing operators to adapt the system configuration in real-time based on changing pressure conditions, maintenance needs, or operational requirements, thereby improving operational flexibility.
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 module effectively manages pressure buildup, reducing the risk of well integrity issues by providing a safe and environmentally friendly bleed-off method, minimizing over or under bleeding, and ensuring reliable well operation through redundancy and pressure monitoring.
Implementation Method 1
a pressure relief valve (PRV) dividing the path into an inlet side coupled to the inlet and an outlet side coupled to the outlet, and configured to open when the pressure of the received fluid in the inlet side exceeds a threshold
Implementation Method 2
a pressure gauge in the inlet side and configured to measure the inlet fluid pressure; a pressure gauge in the outlet side and configured to measure the pressure of the received fluid in the outlet side
Data Source
AI summary
A pressure bleed-off module for an oil well includes: an inlet receiving fluid from an annulus vent of the well; an outlet sending the received fluid to a kill valve of the well; and two paths coupled in parallel between the inlet and the outlet. Each path channels a flow of the received fluid from the inlet to the outlet and includes: a pressure relief valve dividing the path into an inlet side coupled to the inlet and an outlet side coupled to the outlet, opening when the pressure of the fluid in the inlet side exceeds a threshold, and closing when the inlet fluid pressure is below the threshold; pressure gauges measuring the inlet fluid pressure and the pressure of the fluid in the outlet side; a pressure recorder recording the measured inlet and outlet fluid pressures; and a sampling point for draining the fluid in the outlet side.