Isolation Valve Blocks Pressure Transients in Hydraulic Flow Control
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Solution Overview
Problem
Pressure transients in hydraulic actuating fluid control lines can negatively impact other hydraulically actuated devices along well completions, leading to undesired pressure fluctuations and incorrect actuation cycles in flow control valves.
Innovation Solution
Incorporating an isolation valve, such as a sequence valve with a reverse check valve, upstream of the flow control valve to establish a preset pressure level and block detrimental pressure transients, ensuring consistent and dependable actuation of flow control valves by isolating unwanted pressure drops and false pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydraulic actuating fluid is delivered via control lines to flow control valves, then the flow control valves can be actuated to control fluid flow along well completions, but pressure transients in the control line can detrimentally impact other hydraulically actuated devices and cause incorrect actuation cycles
Solution Approach 1:
The control line is segmented into isolated sections using isolation valves positioned at strategic locations. Each segment can independently handle pressure transients without affecting other segments, allowing flow control valves in different zones to operate reliably without interference from pressure fluctuations in adjacent control line sections.
Solution Approach 2:
Isolation valves act as intermediary devices between the hydraulic power source and individual flow control valves. These valves mediate the transmission of hydraulic fluid, allowing controlled flow to actuate valves while blocking the propagation of detrimental pressure transients that would otherwise cause incorrect actuation cycles.
2Productivity
If pressure transients propagate along the control line, then hydraulic actuating fluid can reach multiple flow control valves, but detrimental pressure transients cause undesired pressure fluctuations and incorrect actuation
Solution Approach 1:
The hydraulic control system is divided into isolated segments using isolation valves positioned between the hydraulic power source and multiple flow control valves. This segmentation allows each zone to be controlled independently while preventing pressure transients generated in one zone from propagating to and affecting other zones, thereby eliminating undesired pressure fluctuations.
Solution Approach 2:
The harmful pressure transient propagation is extracted or removed from the system by introducing isolation valves that block the transmission of pressure fluctuations. These valves selectively allow the useful hydraulic actuating function while extracting or eliminating the harmful transient effects that cause incorrect actuation.
3Reliability
If isolation valves are positioned upstream of flow control valves to block pressure transients, then detrimental pressure transient propagation is reduced, but the system complexity increases due to additional valve components
Solution Approach 1:
The isolation valves are designed to perform multiple functions: they provide the primary function of isolating pressure transients to ensure reliable flow control valve actuation, while also serving as control points for delivering hydraulic fluid to multiple downstream valves. This multi-functionality reduces the need for additional dedicated transient suppression devices, thereby limiting the increase in system complexity.
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 solution effectively reduces the propagation of pressure transients along the control line, preventing false indexing cycles and ensuring reliable operation of flow control assemblies by maintaining consistent pressure signals, thereby improving the dependability and predictability of well operations.
Implementation Method 1
The isolation valve establishes a preset pressure level, and the pressure of the supplied actuating fluid is raised above the preset pressure level to establish flow of actuating fluid to the flow control valve
Implementation Method 2
The isolation valve also isolates detrimental pressure transients. For example, the isolation valve may be used to reduce or block the propagation of detrimental pressure transients along the actuating fluid to other controlled devices
Data Source
AI summary
A technique facilitates controlling fluid flow in a well system or other flow related system. The control of fluid flow may be accomplished by utilizing a flow control valve which is selectively actuated via the controlled application of an actuating fluid. An isolation valve is positioned along the flow of actuating fluid at a location upstream of the flow control valve. The isolation valve establishes a preset pressure which is applied to establish flow of actuating fluid to the flow control valve and also isolates detrimental pressure transients. For example, the isolation valve may be used to reduce or block the propagation of detrimental pressure transients along the actuating fluid to other controlled devices.