Variable Orifice Injection Valve for Flapper Chatter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing injection valves for hydrocarbon wells face challenges in maintaining optimal flow rates and preventing flapper valve chatter due to fixed orifice diameters, leading to pressure drops and potential damage from fluid flow variations.
Innovation Solution
A tubing retrievable injection valve with a variable orifice nozzle assembly that adjusts to changing flow rates, ensuring the flapper valve remains fully open and minimizing pressure drops, and includes a temporary lockout feature to prevent damage from fluid flow during injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed orifice diameter is used in the injection valve, then the valve structure is simple, but the pressure drop increases and flapper valve chatter occurs when injection flow rates vary
Solution Approach 1:
The patent applies the dynamics principle by making the orifice diameter variable rather than fixed. The nozzle assembly includes a movable nozzle body that can change the orifice diameter dynamically in response to flow rate variations. This allows the valve to adapt to changing injection conditions, preventing flapper valve chatter and maintaining stable operation across different flow rates while preserving structural simplicity through automated adjustment mechanisms.
2Reliability
If a variable orifice nozzle assembly is used, then pressure drop is minimized and flapper valve chatter is prevented, but the device complexity increases
Solution Approach 1:
The patent implements the self-service principle by designing the nozzle assembly to automatically adjust its orifice diameter in response to flow rate changes without requiring external control systems. The movable nozzle body is positioned such that flow conditions directly influence the orifice opening, enabling the system to self-regulate and maintain optimal performance while minimizing complexity through elimination of complex control mechanisms.
Solution Approach 2:
The patent applies the nesting principle by integrating the movable nozzle body within the existing valve structure. The nozzle assembly is nested within the valve body, with the movable nozzle positioned inside the stationary housing. This nested configuration allows the variable orifice mechanism to be incorporated without significantly increasing overall device complexity, as the adjustment mechanism utilizes the existing structural space.
3Adaptability or versatility
If the nozzle assembly is made retrievable via wireline/slickline, then the orifice diameter can be changed on surface to adapt to different flow rates, but the device complexity and operation complexity increase
Solution Approach 1:
The patent applies the universality principle by designing the nozzle assembly with a standardized retrieval interface that allows the same assembly to serve multiple functions: it can be installed, retrieved, and reinstalled using standard wireline or slickline operations. The universal design of the retrieval mechanism enables the nozzle to be adapted to different flow rate requirements by simply replacing the entire assembly with one having a different orifice diameter, rather than requiring complex in-situ adjustment mechanisms.
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 variable orifice nozzle assembly maintains optimal flow rates and prevents flapper valve chatter across a range of injection rates, reducing pressure drops and protecting the valve assembly from harmful fluid flow conditions.
Implementation Method 1
The nozzle is designed to generate a pressure drop sufficient to hold the flapper valve fully open
Implementation Method 2
an injection safety valve having a restrictor to create a pressure differential so as to move a flow tube past a flapper valve
Data Source
AI summary
A wireline retrievable injection valve for an oil or gas well has an internal valve that is initially moved to open a flapper safety valve and also opens to allow fluid flow through the valve. The internal valve includes a sleeve that opens the flapper safety valve and shields the flapper safety valve from fluid. In this manner the flapper valve is protected from being caused to “flutter” or “chatter” due to pressure variations in the fluid flow, thereby damaging the seat.