Valve Apparatus Using Differential Pressure for Downhole Flow Control
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Solution Overview
Problem
Existing down-hole shut-in valves for well monitoring require complex mechanical systems for fast closure and reopening, which increases costs and reduces reliability, and there is a need for a solution that can efficiently control fluid flow using pressure differences without relying on intricate mechanisms.
Innovation Solution
A valve apparatus with a shuttle piston mechanism that uses differential pressure to instantly close and reopen, coupled with an electronic timer and motor system for automated operation, and an inductive coupler for real-time data communication, allowing for efficient control of fluid flow between the wellbore and production/treatment tubing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If complex mechanical systems are used for fast closure and reopening of down-hole valves, then the valve closure speed is improved, but the device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical actuation systems with a pressure differential-driven mechanism. The valve uses a pressure equalization port that allows fluid pressure to automatically equalize between chambers, causing the valve to open and close in response to pressure changes without requiring complex mechanical actuators, motors, or control systems.
Solution Approach 2:
The valve apparatus is designed to automatically open and close in response to pressure differential changes in the wellbore environment. The pressure equalization port enables the valve to self-regulate its position based on formation pressure variations, eliminating the need for external control mechanisms during drawdown and buildup phases.
2Speed
If complex mechanical systems are used for fast closure and reopening, then the valve closure speed is improved, but the reliability decreases
Solution Approach 1:
By replacing mechanical actuation systems with a pressure differential-driven mechanism, the patent eliminates multiple moving parts, seals, and actuators that could fail. The simple design with a pressure equalization port reduces points of failure and improves reliability in the harsh down-hole environment.
Solution Approach 2:
The patent removes complex mechanical control systems, motors, and actuators from the valve design, retaining only the essential pressure-responsive elements. This extraction of unnecessary components simplifies the system and reduces potential failure points.
3Device complexity
If pressure differential mechanism is used for valve operation, then the device complexity is reduced, but the control precision may be affected
Solution Approach 1:
The patent incorporates a specifically designed pressure equalization port with precise dimensions and positioning to control the timing and rate of pressure equalization. This localized precision feature ensures accurate valve response to pressure differential changes while maintaining overall system simplicity.
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 valve apparatus achieves fast and reliable closure and reopening of the valve using differential pressure, reduces the need for complex mechanical systems, and enables real-time monitoring and control, enhancing the efficiency and cost-effectiveness of well monitoring operations.
Implementation Method 1
control fluid flow between the fluid passage and a fluid delivery conduit having one end thereof disposed within the fluid passage to facilitate delivery of fluid between an interior and an exterior of the fluid passage via a pressure difference between the fluid passage and the fluid delivery conduit
Implementation Method 2
an inductive coupler for real-time data communication
Data Source
AI summary
A valve apparatus for controlling fluid flow between a fluid passage and a fluid delivery conduit therein includes a valve housing having first and second housing ports spaced therealong, and a driven member driveable toward and away from the first housing port. A closure member having a port is coupled to the driven member and slidable therealong. The driven member and closure member close and open the closure member port during movement of the driven member toward and away from the first port to induce and relieve a pressure differential, exerted on the closure member by fluid entering the housing, acting to slide the closure member along the driven member to close the first housing port. An inductive coil extends about an open end of the housing to receive a coil-equipped end of a probe therein to communicate the probe with monitoring and control systems across the valve.