Downhole Water Removal Tool for Mature Reservoirs
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Solution Overview
Problem
In the oil and gas industry, high water-cut in mature reservoirs reduces economic viability and often requires abandoning wells, as existing surface-based hydrocarbon-water separation methods compromise oil production capacity.
Innovation Solution
A downhole hydrocarbon-water separation tool that includes a hydrocarbon-water separation system with a gravity separator, heating element, or emulsifier injection line, which separates hydrocarbon-water emulsions downhole and injects water back into a water zone, reducing surface water production and enhancing oil recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If surface-based hydrocarbon-water separation is used, then water can be separated from hydrocarbons, but oil production capacity is compromised and water-cut becomes extremely high
Solution Approach 1:
The patent divides the wellbore into distinct functional zones: a separation zone with a gravity separator for hydrocarbon-water separation, a heating zone with heating elements for emulsion breaking, and an injection zone for water disposal. This segmentation allows each zone to perform its specific function efficiently, separating water downhole before it reaches the surface, thereby reducing surface water production while maintaining oil production capacity.
Solution Approach 2:
The patent transitions the separation process from the surface dimension to the downhole dimension. By implementing separation, heating, and injection operations downhole within the wellbore annulus, the system eliminates the need for surface pumps and changes the operational dimension from surface-based to subsurface-based processing, thereby resolving the contradiction between water removal and oil production maintenance.
2Quantity of substance
If water encroachment is blocked by mechanical means or chemicals, then water production is reduced, but oil production capacity is adversely compromised
Solution Approach 1:
The patent converts the harmful effect of water encroachment into a beneficial process by using the water itself as an injection fluid. The separated water is reinjected into the formation to maintain reservoir pressure and drive additional oil production. This transforms the problem of water production into a solution for enhanced oil recovery, eliminating the need for mechanical or chemical blocking methods that would compromise oil production.
Solution Approach 2:
The patent changes the physical parameters of water by heating it to break emulsions and separate hydrocarbons. By controlling temperature and other parameters in the separation zone, the system efficiently separates water from hydrocarbons without using mechanical barriers or chemicals that would reduce oil production capacity.
3Quantity of substance
If downhole separation is implemented, then surface water production is minimized, but device complexity increases
Solution Approach 1:
The downhole tool is designed as a multi-functional integrated system that combines separation, heating, and injection capabilities in a single device. The gravity separator handles separation, heating elements provide thermal processing, and injection lines enable water disposal - all within one downhole tool assembly. This multi-functionality reduces the need for multiple separate devices and surface equipment, making the increased downhole complexity worthwhile by eliminating surface water production.
Solution Approach 2:
The system is designed to be self-sufficient downhole, with the gravity separator automatically separating hydrocarbons and water based on density differences, heating elements self-regulating temperature, and injection lines automatically injecting separated water back into the formation. This self-service capability reduces the need for complex surface control systems and monitoring equipment, thereby managing device complexity while achieving the goal of minimized surface water production.
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 downhole tool minimizes surface water production, allows independent hydrocarbon fluid production without surface pumps, and prevents water from reaching the hydrocarbon zone, thereby maintaining well viability and optimizing oil production.
Implementation Method 1
a flow of the hydrocarbon-water emulsion is directed to accumulate in a compartment of a hydrocarbon-water separator. The hydrocarbon-water separator is configured to separate the hydrocarbon-water emulsion into water and a hydrocarbon fluid
Implementation Method 2
The downhole tool includes a hydrocarbon-water separation system that includes at least one of a gravity separator, a heating element, or an emulsifier injection line
Implementation Method 3
activating, in response to a first sensor detecting a first water level in the annulus, a pump that pumps the water from the annulus into a water zone below the wellbore
Data Source
AI summary
In some implementations, a method involves determining a level of accumulation of a hydrocarbon-water emulsion in an annulus of a wellbore. The method further involves based on the level of accumulation, determining an operating setting of a hydrocarbon-water separator and operating the hydrocarbon-water separator at the operating setting, where the hydrocarbon-water separator separates the hydrocarbon-water emulsion into water and a hydrocarbon fluid. Further, the method involves activating, in response to a first sensor detecting a first water level in the annulus, a pump that pumps the water from the annulus into a water zone below the wellbore. Yet further, the method involves deactivating the pump in response to a second sensor detecting a second water level in the annulus, where the second sensor is located below the first sensor.