Downhole Flow Control Device with Dissipation Structure
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Solution Overview
Problem
In oil and gas operations, downhole flow control devices face issues such as erosion, corrosion, and back-flow, which can damage wellbore infrastructure like screens and gravel packs, leading to reduced production or injection rates.
Innovation Solution
A downhole flow control device with a nozzle and dissipation structure that dissipates fluid momentum before exit, minimizing impact on adjacent surfaces and structures, and incorporating a one-way valve arrangement to prevent reverse flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flow control devices are used to control fluid flow in multi-zone wellbore completions, then flow profile control is improved, but erosion and corrosion of adjacent surfaces and structures occur due to fluid impingement
Solution Approach 1:
A dissipation structure is introduced as an intermediary element between the nozzle and adjacent surfaces. This dissipation structure intercepts the high-velocity fluid jet exiting the nozzle, dissipates its kinetic energy through turbulence and mixing, and redirects the fluid in a controlled manner, thereby protecting adjacent surfaces from erosion and corrosion while maintaining the flow control function
Solution Approach 2:
The high-velocity fluid jet that causes erosion and corrosion is redirected to impinge on the dissipation structure. The kinetic energy that would otherwise be harmful to adjacent surfaces is converted into beneficial mixing and turbulence within the dissipation structure, improving flow distribution while protecting surrounding components
2Stress or pressure
If flow control devices are installed in wellbore completions, then flow restriction and back pressure control are improved, but back-flow and cross-flow between pressured zones occur during shut-in conditions
Solution Approach 1:
A one-way valve arrangement is incorporated that dynamically responds to pressure differentials across the flow control device. During normal production or injection, the valve remains open allowing controlled flow. During shut-in conditions when pressure differentials reverse, the valve automatically closes to prevent back-flow and cross-flow between zones, thereby protecting the completion system
3Productivity
If fluid exits the nozzle with high momentum to maintain flow control, then flow restriction effectiveness is improved, but impact on adjacent surfaces and structures increases
Solution Approach 1:
The dissipation structure serves as a mediator that receives the high-momentum fluid from the nozzle, dissipates the momentum through internal turbulence and eddies, and then releases the fluid at reduced velocity. This allows the nozzle to maintain effective flow control with high exit velocity while the dissipation structure protects adjacent surfaces from the harmful impact forces
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 solution effectively reduces erosion and corrosion risks, maintains well performance by controlling fluid flow direction, and accommodates both inflow and outflow operations, preventing damage to surrounding equipment.
Implementation Method 1
fluid flowing through the body in a first direction will exit the nozzle and impinge on the dissipation structure prior to exit from the flow control device
Data Source
AI summary
A downhole flow control device includes a body to be secured within a wall of a tubular, wherein the body defines a flow path therethrough, with a nozzle mounted within the flow path. A dissipation structure is positioned on a first side of the nozzle, such that fluid flowing through the body in a first direction will exit the nozzle and impinge on the dissipation structure prior to exit from the flow control device.