Elastomeric Valve Actuation for Wellbore Chemical Injection
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Solution Overview
Problem
Existing chemical injection systems for oil and gas wells face limitations in controlling valve opening and closing due to hydraulic pressure constraints, often requiring expensive and complex electronics for precise control of fluid flow rates in the annulus and wellbore.
Innovation Solution
A chemical injection system that utilizes a pilot line and chemical line connected to a valve, where the pilot line is hydraulically actuated to control the flow rate, and includes a backflow prevention valve and flow restrictors to manage pressure and flow rates, allowing for adjustable actuation pressures and flow rates through a network of valves and lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydraulic control lines and flow regulators are used to control valve choking position, then valve control is achieved, but the control is limited by the amount of hydraulic pressure that can be applied downhole
Solution Approach 1:
The patent replaces the traditional hydraulic control system with an elastomeric actuator system. The elastomeric actuator uses elastic deformation of a flexible membrane or diaphragm to convert pressure differential into mechanical motion for valve actuation. This substitution eliminates the need for complex hydraulic control lines and flow regulators, allowing valve control without being limited by downhole hydraulic pressure constraints.
2Measurement precision
If permanent gauges with complex electronics are used for monitoring, then precise measurement is achieved, but the system becomes expensive
Solution Approach 1:
The elastomeric actuator system is inherently observable through its mechanical deformation. The position of the flexible membrane or diaphragm directly indicates the valve choking position without requiring separate sensors or electronics. This self-indicating mechanism provides measurement functionality built into the actuator itself, eliminating the need for expensive permanent gauges and complex electronic monitoring systems.
3Ease of operation
If traditional hydraulic control systems are used, then valve actuation is achieved, but the system requires complex electronics and is expensive
Solution Approach 1:
The patent replaces electronic control systems with a purely mechanical elastomeric actuation system. The elastomeric actuator responds directly to pressure differential across its membrane, converting this differential into mechanical displacement that actuates the valve. This mechanical response eliminates the need for electronic controllers, sensors, and communication systems, simplifying the overall system while maintaining ease of operation.
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
Enables precise control of fluid flow rates into the wellbore, minimizing downtime and intervention costs by allowing adjustable actuation pressures and flow rates, while preventing backflow and stabilizing valve operation.
Implementation Method 1
A pilot line may attach to the valve and hydraulically actuate the valve to open and/or closed position
Implementation Method 2
A first flow restrictor may be disposed in the chemical line and operable to reduce a flow rate of the fluid
Data Source
AI summary
Systems and method for injection a chemical into a wellbore. A chemical injection system may comprise a first valve, a chemical line, a pilot line, an injection line, and a backflow prevention valve disposable in the injection line. A production fluid recovery system may comprise a chemical injection system, a first valve, a pilot line, an injection line, a backflow prevention valve, a production tree, a wellhead, and production tubing. A method for actuating a valve in a chemical injection system may comprise pushing a fluid into a chemical line, pressurizing a pilot line to open a first valve, pushing the fluid through the first valve, increasing pressure in the pilot line to open a second valve, pushing the fluid through the second valve, pushing the fluid through a chemical line, and injecting fluid into a wellbore from the chemical line.