Density-Based Flow Control for Water and Gas Coning
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Solution Overview
Problem
In hydrocarbon production wells, existing technologies face challenges in effectively regulating the flow of formation fluids to prevent water and gas coning, minimize unwanted fluid production, and maximize oil production, as they often lack discrimination between different types of fluids and require operator control.
Innovation Solution
The implementation of an autonomous flow control device with a shuttle valve system that utilizes centrifugal force and buoyant floats to selectively restrict the flow of unwanted fluids like water and gas into the production tubing, operating passively without moving components or electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If autonomous flow control devices are used to regulate fluid flow, then fluid flow regulation is improved, but device complexity increases
Solution Approach 1:
The autonomous flow control device utilizes the density differences between formation fluids (oil, water, gas) to automatically regulate flow without external control systems. The device self-adjusts by allowing lighter fluids (oil, gas) to pass through while blocking heavier fluids (water) based on their natural buoyancy and density characteristics, eliminating the need for complex electronic controls or operator intervention.
Solution Approach 2:
The patent replaces complex electronic or mechanical control systems with a passive physical mechanism based on density separation. Instead of using motors, sensors, or control valves, the invention employs the natural physical property of density differences to achieve autonomous flow regulation, significantly simplifying the device architecture.
2Device complexity
If non-discriminating gatekeeper devices are used, then device complexity is reduced, but fluid flow discrimination capability is worsened
Solution Approach 1:
The flow control device incorporates localized density-based separation mechanisms at specific points in the flow path. By creating zones where density differences can be exploited (such as separation chambers or inclined surfaces), the device achieves fluid discrimination without requiring complex overall system architecture, maintaining simplicity while adding selective functionality.
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
This solution effectively regulates fluid flow by using centrifugal force and buoyant properties to manage the entry of fluids into the production tubing, optimizing the production of desired fluids and minimizing the production of undesired ones, thereby enhancing wellbore operations.
Implementation Method 1
a first float configured to block a first flow path when a density of the formation fluid is greater than a first threshold density and allow the formation fluid to flow through the first flow path when the density of the formation fluid is less than the first threshold density
Implementation Method 2
utilizes centrifugal force and buoyant floats to selectively restrict the flow of unwanted fluids like water and gas into the production tubing
Data Source
AI summary
A control system may comprise a flow control device, wherein the flow control device comprises water floats and gas floats and a regulatory valve connected to the flow control device through a control line. An autonomous flow control device may comprise a housing, one or more floats disposed within the housing, one or more protrusions connected to the outside of the housing, and an outlet disposed in the housing.