Pressure-Regulating Check Valve Assembly for Vacuum-Induced Chatter
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Solution Overview
Problem
Check valves in chemical injection systems for hydrocarbon exploration and production often open prematurely due to negative pressure differentials, leading to vacuum creation and damage from unwanted fluid leakage, which causes repeated opening and closing that damages the sealing surfaces.
Innovation Solution
An anti-vacuum, pressure-regulating check valve assembly is introduced, featuring a housing with a first check valve and a lift check valve oriented to restrict flow in opposite directions, along with a flow dampener positioned between them to prevent immediate pressure drops and debris collection areas to manage debris, ensuring the check valves remain closed until sufficient uphole pressure is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is used to prevent fluid flow from production tubing to control line, then fluid leakage is prevented, but the valve opens prematurely due to negative pressure differentials causing vacuum creation and damage
Solution Approach 1:
A flow dampener is introduced as an intermediary component between the first and second check valves. This flow dampener restricts fluid flow to prevent immediate pressure drops that would cause the second check valve to open prematurely, thereby eliminating vacuum conditions and chattering while maintaining reliable sealing.
Solution Approach 2:
The flow dampener provides beforehand cushioning by controlling the rate of pressure equalization between the control line and production tubing. This prevents sudden negative pressure differentials that would cause vacuum damage and repeated valve opening/closing, thus protecting the valve system before harmful conditions can develop.
2Stress or pressure
If the check valve opens to equalize pressure, then pressure differential is reduced, but immediate pressure drops cause repeated opening and closing that damages sealing surfaces
Solution Approach 1:
The flow dampener acts as an intermediary that mediates pressure equalization between the control line and production tubing. It allows gradual pressure equalization while preventing immediate pressure drops that would cause the check valve to chatter and damage sealing surfaces, thus maintaining both pressure balance and sealing integrity.
Solution Approach 2:
The flow dampener provides cushioning during pressure equalization by restricting the rate of fluid flow. This prevents sudden pressure changes that would cause repeated valve opening and closing, thereby protecting sealing surfaces from damage while still achieving pressure equalization.
3Device complexity
If a single check valve is used to control fluid flow, then device complexity is low, but it cannot prevent both uphole and downhole flow in opposite directions simultaneously
Solution Approach 1:
The check valve assembly is segmented into two separate check valves (first and second check valves) oriented in opposite directions, with the flow dampener positioned between them. This segmentation allows each valve to handle flow control in one direction, achieving reliable bidirectional flow control while maintaining relatively simple device architecture.
Solution Approach 2:
The check valve assembly is designed with multi-functionality to handle both uphole and downhole flow control simultaneously. The first check valve prevents flow from production tubing to control line, while the second check valve prevents reverse flow, and the flow dampener prevents pressure drops, creating a universal solution for bidirectional flow control.
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
This solution effectively prevents the creation of vacuums and reduces the risk of damage by ensuring the check valves open only when sufficient pressure is applied, maintaining a stable seal and reducing the likelihood of chattering and leakage, thereby enhancing the reliability of control lines and valves.
Implementation Method 1
a flow dampener positioned between them to prevent immediate pressure drops
Implementation Method 2
a first check valve and a second check valve oriented to restrict flow in opposite directions
Data Source
AI summary
Apparatuses and methods for pressure regulating check valve assemblies are described. In an example, the check valve assembly comprises a housing defining a fluid passage having a fluid inlet side and a fluid outlet side. A first check valve positioned within the fluid passage oriented to restrict fluid flow from the fluid inlet side and a second check valve positioned within the fluid passage oriented to restrict fluid flow from the fluid outlet side. A flow dampener is positioned within the fluid passage and between the first and second check valves.