Pneumatic Gas Pump System for Deep Well Valve Control
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Solution Overview
Problem
Conventional gas lift systems for oil and gas wells face inefficiencies, particularly in deeper wells where existing gas pumps are not suitable due to high pressure requirements and complex valve systems, leading to reduced production efficiency and increased maintenance costs.
Innovation Solution
A gas pump system with a single fluid control line actuating both gas supply and vent valves, using bellows-responsive control valves that can be installed and replaced through the production tubing, eliminating the need for hydraulic control lines and reducing the complexity of valve operations, allowing for efficient gas lift at greater depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional gas pump systems with hydraulic control lines are used in deep wells, then production can be maintained at shallower depths, but the system becomes inoperable at depths exceeding 4,500 feet due to excessive fluid pressure
Solution Approach 1:
The patent replaces the hydraulic control system with a pneumatic control system. Instead of using hydraulic fluid pressure to actuate valves, the invention uses compressed gas pressure transmitted through gas supply and vent lines to control the bellows-responsive valves. This substitution eliminates the fundamental limitation of hydraulic systems in deep wells where fluid pressure becomes excessive, allowing reliable operation at depths of 8,000 feet or more.
Solution Approach 2:
The invention changes the control medium from hydraulic fluid to compressed gas, fundamentally altering the pressure transmission mechanism. Gas can be compressed to higher pressures without the same density and weight constraints as hydraulic fluid, enabling effective valve control at greater depths where hydraulic systems fail due to excessive backpressure.
2Ease of operation
If multiple hydraulic control lines are used to control gas supply and vent valves separately, then valve control is achieved, but system complexity increases and maintenance difficulty increases
Solution Approach 1:
The patent combines the control of gas supply and vent valves into a single integrated pneumatic control system. Both valves are actuated by compressed gas pressure transmitted through gas supply and vent lines that terminate at a common control point near the pump chamber. This merging of control functions into a unified pneumatic system reduces the number of separate control lines needed and simplifies the overall control architecture compared to multiple independent hydraulic control lines.
Solution Approach 2:
The pneumatic control system serves multiple functions through a single mechanism: compressed gas pressure simultaneously controls both the gas supply valve and vent valve operations. The bellows-responsive valve design allows a single pressure source to actuate multiple valves, providing universal control functionality that reduces system complexity.
3Productivity
If conventional gas pump systems are installed in deep wells, then production can be maintained, but valve wear increases and service life decreases due to high pressure exposure
Solution Approach 1:
By replacing hydraulic actuation with pneumatic actuation, the system reduces valve wear and extends service life. Compressed gas provides smoother, more gradual pressure application compared to hydraulic fluid, reducing mechanical shock and wear on valve components. The bellows-responsive design further protects valves by providing progressive actuation and reducing direct mechanical contact under extreme pressure conditions.
Solution Approach 2:
Changing from hydraulic to pneumatic actuation fundamentally alters the pressure transmission characteristics. Gas is more compressible than hydraulic fluid, providing a cushioning effect that reduces pressure spikes and mechanical stress on valves. This parameter change in the control medium directly reduces wear mechanisms and extends the operational life of valve components in high-pressure deep well environments.
4Ease of repair
If bellows-responsive control valves are used instead of hydraulic valves, then maintenance is simplified and service life is extended, but installation complexity increases
Solution Approach 1:
The bellows-responsive valves are designed to be self-actuating through compressed gas pressure, eliminating the need for complex hydraulic pump systems, reservoirs, and filtration equipment that would require extensive maintenance. The pneumatic system uses the well's own produced gas as the control medium, creating a self-sustaining control system that reduces maintenance requirements. The valves automatically respond to pressure changes without requiring external hydraulic power sources.
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 system enhances production efficiency by reducing valve wear, increasing service life, and simplifying maintenance, enabling reliable operation at depths up to 8,000 feet or more with reduced fluid pressure exposure, thus extending the life of the well and reducing operational costs.
Implementation Method 1
A valve body responsive to pressure in the actuating chamber and the sealed chamber opens and shuts a gas flowpath between an inlet and an outlet
Implementation Method 2
a bellows responsive to pressure in the actuating chamber and the sealed chamber
Implementation Method 3
Gas then is injected into the chamber, forcing liquid up the dip tube, out of the chamber, and into the production tubing
Data Source
AI summary
A gas lift system for oil and gas wells has a gas pump. The gas pump comprises production tubing, a chamber, a dip tube, check valves, a gas supply line and control valve, a gas vent line and control valve, and a fluid control line. Liquid is pumped to the surface by allowing it to collect in the chamber and then forcing it out of the chamber with high-pressure gas. The gas supply and vent valves preferably are controlled by a single pressure control line. The system preferably included retrievable valves that may be installed through the production tubing to provide a life-of-the-well gas lift system.