Pneumatic Well Cavity Device for Liquid Loading and Sand Management
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Solution Overview
Problem
Liquid-loading in oil and gas wells, particularly those with sandy, silty, or muddy liquids, leads to premature failure of conventional artificial lift equipment due to particulate material, resulting in reduced production and ultimate reserve recovery.
Innovation Solution
A device with a cavity and valves for controlling fluid flow, utilizing pressurized gas to displace liquids and suspended solids, and probes to manage fluid levels, along with baffles to prevent upward movement of solids, facilitating efficient gas recovery by separating liquids and solids downhole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional artificial lift equipment is used to pump liquids from gas wells, then production can be maintained initially, but the equipment fails prematurely due to particulate material (sand, silt, mud)
Solution Approach 1:
The invention uses a pneumatic pump that injects pressurized gas into the wellbore to lift liquids and particulate matter to the surface. This pneumatic mechanism avoids direct mechanical contact with solids, eliminating wear and failure issues associated with conventional mechanical lift equipment while maintaining reliable operation in sandy, silty, or muddy conditions
Solution Approach 2:
The patent replaces conventional mechanical artificial lift equipment (such as electric submersible pumps or rod pumps) with a pneumatic system that uses compressed gas to displace liquids. This substitution eliminates mechanical components subject to wear from particulate contamination, thereby improving equipment reliability while sustaining production rates
2Ease of operation
If liquids are not completely removed from the well, then production continues with minimal intervention, but liquid loading occurs causing intermittent flow and eventual well kill
Solution Approach 1:
The pneumatic pump system operates by injecting pressurized gas that automatically lifts liquids and gases to the surface without requiring external mechanical intervention. The system self-regulates by maintaining gas pressure sufficient to overcome liquid column weight, ensuring continuous liquid removal and preventing liquid loading that would otherwise cause intermittent flow and well failure
Solution Approach 2:
The invention maintains continuous production by constantly injecting pressurized gas to lift liquids and particulates. This continuous pneumatic action prevents liquid accumulation in the wellbore, eliminating the cyclic intermittent flow characteristic of liquid loading and ensuring uninterrupted gas production throughout the well's productive life
3Reliability
If siphon string technology is used to address sand, mud and silt problems, then equipment failure is reduced, but production rate and ultimate reserve recovery are limited
Solution Approach 1:
The pneumatic pump delivers higher production rates compared to siphon string technology by using pressurized gas to actively lift liquids and particulates. This pneumatic mechanism overcomes the passive suction limitation of siphon systems, enabling more efficient liquid removal and higher gas production rates while maintaining equipment durability through wear-free operation
Solution Approach 2:
The invention changes the operational parameters by using high-pressure gas injection to create sufficient lift force for liquid removal. This parameter change (from passive siphoning to active pneumatic lifting) enables both improved equipment durability and enhanced production rates, overcoming the limitations of siphon string technology
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
Enhances gas production rates and extends the life of wells by effectively managing liquid loading, reducing equipment failures, and allowing for the separation and utilization of suspended solids as value-added products.
Implementation Method 1
a gas line for providing a stream of pressurized gas to push downward on fluid in the cavity in a compression stroke which closes the lower valve and opens the upper valve
Implementation Method 2
the gas line further used to exhaust contained gas from the cavity during an exhaust stroke when infiltration of fluid into the cavity raises the fluid level in the cavity
Implementation Method 3
the cavity further contains a plurality of baffles for halting upward movement of the suspended solids in the fluid as the fluid rises during the exhaust stroke
Data Source
AI summary
A system for recovery of gas trapped by fluid and particulate matter in a well includes a device with a lower valve for controlling flow of fluid into the cavity and an upper valve for controlling flow of the fluid and suspended solids out of the cavity. The device also includes: a gas line for providing a stream of pressurized gas to push on fluid in the cavity in a compression stroke which closes the lower valve and opens the upper valve and to exhaust contained gas from the cavity during an exhaust stroke when infiltration of fluid into the cavity raises the fluid level; an effluent line for allowing exit of the fluid and suspended solids during the compression stroke; and a probe line providing powering pair of probes for initiating and halting entry of the stream of pressurized gas into the cavity.