Autonomous Flow Control Device for Viscosity-Dependent Production
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Solution Overview
Problem
Current autonomous inflow control devices for hydrocarbon-bearing subterranean wells face limitations such as fatigue failure, intricate component failures, and lack of sensitivity, making it difficult to control fluid flow rates as fluid compositions change over time without requiring well intervention or complex structures.
Innovation Solution
An autonomous flow control device with a valve assembly that distinguishes between viscosity dominant and inertia dominant fluid flows, adjusting resistance based on fluid viscosity to regulate production rates, eliminating the need for biasing devices and intricate components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If autonomous inflow control devices are used to control fluid flow rates, then production control capability is improved, but device complexity increases leading to component failure
Solution Approach 1:
The flow control device is divided into multiple independent flow paths (first flow path with first resistance and second flow path with second resistance). Each path is designed to handle specific fluid types, allowing the device to control different fluid phases separately without requiring complex moving parts or actuators.
Solution Approach 2:
Different sections of the flow control device have different resistance characteristics tailored to specific fluid types. The first flow path is optimized for viscous fluids while the second flow path is optimized for non-viscous fluids, allowing each section to perform its specific function effectively.
2Measurement precision
If intricate components are used in flow control devices, then control precision is improved, but reliability decreases due to fatigue failure
Solution Approach 1:
The flow control device automatically adjusts fluid flow distribution based on fluid viscosity without requiring external control systems, sensors, or actuators. The device self-regulates by directing viscous fluids through the first flow path and non-viscous fluids through the second flow path, eliminating components that could fail.
Solution Approach 2:
The invention replaces complex, failure-prone intricate components with simple, robust flow path structures that have no moving parts. The design prioritizes reliability over sophisticated control mechanisms, using straightforward resistance-based flow management that can withstand harsh downhole conditions.
3Device complexity
If fixed flow control systems are used, then device simplicity is maintained, but adaptability to changing fluid compositions deteriorates
Solution Approach 1:
The flow control device dynamically adapts to changing fluid compositions by providing multiple flow paths with different resistance characteristics. As fluid viscosity changes, the flow automatically redistributes between the first and second flow paths, allowing the device to respond to varying production conditions without mechanical adjustment.
Solution Approach 2:
The flow control device is designed to handle multiple fluid types (viscous and non-viscous) simultaneously through its dual flow path structure. This multi-functional design allows a single device to control various fluid compositions that may change over time, eliminating the need for multiple specialized control systems.
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 controls fluid flow rates by adapting to changing fluid viscosities, maximizing production of desired fluids and minimizing production of undesired fluids without requiring well intervention, thus enhancing the efficiency and reliability of fluid production.
Implementation Method 1
When the viscosity of the fluid flowing therethrough is greater than a first predetermined level, the fluid follows the viscosity dominant flow path with the first flow resistance. When the viscosity of the fluid flowing therethrough is less than a second predetermined level, the fluid follows the inertia dominant flow path with the second flow resistance
Implementation Method 2
an inertia dominant flow path configured to provide a second flow resistance
Data Source
AI summary
An autonomous flow control device includes a valve plate having a surface and a valve element at least partially formed on the surface. The valve element has an inlet and an outlet with a fluid flow path extending therebetween. The fluid flow path included a viscosity dominant flow path configured to provide a first flow resistance and an inertia dominant flow path configured to provide a second flow resistance that is greater than the first flow resistance such that when the viscosity of the fluid flowing therethrough is greater than a first predetermined level, the fluid follows the viscosity dominant flow path with the first flow resistance and when the viscosity of the fluid flowing therethrough is less than a second predetermined level, the fluid follows the inertia dominant flow path with the second flow resistance, thereby regulating the production rate of the fluid responsive to changes in fluid viscosity.