Downhole Inflow Valve Using Viscosity-Triggered Flow Restrictors
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Solution Overview
Problem
Current inflow control devices for hydrocarbon production struggle to efficiently prevent gas and water breakthrough while maintaining oil production, often choking oil flow and lacking reversibility and robustness under harsh well conditions.
Innovation Solution
A fluid flow control device with a housing featuring a first fluid flow restrictor for laminar flow and a second for turbulent flow, utilizing pressure changes due to fluid properties like viscosity to actuate a valve, ensuring autonomous and reversible operation to prevent unwanted fluids from entering the production flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ICDs with fixed flow area are used to prevent water and gas breakthrough, then coning effects are mitigated, but oil production is choked and recovery rates are reduced
Solution Approach 1:
The patent employs dynamic flow control elements that can adjust their flow area in response to changing fluid conditions. The device transitions from fixed-area ICDs to systems with movable components that dynamically respond to fluid density and viscosity changes, allowing the flow area to be larger for oil (higher viscosity) and smaller for water/gas (lower viscosity), thus resolving the contradiction between preventing breakthrough and maintaining production
Solution Approach 2:
The invention changes the operational parameters of the flow control device by utilizing fluid property variations (density, viscosity) to trigger different flow resistance states. By designing the device to respond to these parameter changes, it automatically adjusts its flow characteristics to favor oil production while blocking water and gas, thereby improving both reliability and productivity simultaneously
2Reliability
If autonomous ICDs with valve elements are used to choke flow when water and gas enter, then fluid breakthrough is prevented, but the device lacks reversibility and cannot reopen when oil flow resumes
Solution Approach 1:
The patent implements feedback mechanisms where the flow control device continuously monitors fluid properties and adjusts its state accordingly. When oil flows (higher viscosity), the device receives feedback that opens the valve; when water or gas enters (lower viscosity), the feedback triggers valve closure. This feedback loop provides both reliable shut-off and automatic reversibility, resolving the contradiction between these two features
Solution Approach 2:
The device is designed to be self-regulating, using the inherent properties of the flowing fluids themselves to control its operation. The fluid's own density and viscosity variations provide the actuating force for the valve, eliminating the need for external control systems and enabling automatic reversible operation that adapts to changing reservoir conditions
3Reliability
If external control systems are used to adjust tortuous fluid path cross-sectional area, then flow control is achieved, but the system becomes expensive and complex
Solution Approach 1:
The patent eliminates external control systems by designing a self-actuating mechanism where the fluid itself provides the control force. The varying density and viscosity of different fluids (oil vs. water/gas) create pressure differentials that automatically move the flow control elements, achieving reliable flow control without expensive external actuators or control systems
Solution Approach 2:
The invention replaces complex external mechanical control systems with a simpler internal mechanism that uses fluid pressure and density differences as the actuating force. This substitution of the control mechanism reduces device complexity and cost while maintaining effective flow control capability
4Area of stationary object
If the number of ICD sections is increased to cover more zones, then reservoir contact is improved, but the device complexity and cost increase
Solution Approach 1:
The patent designs a universal ICD module that can be replicated and combined to cover multiple zones. Each module performs the same multi-functional role of dynamically controlling flow based on fluid properties, allowing the system to extend reservoir contact by adding identical standardized sections rather than designing increasingly complex custom systems for each additional zone
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 prevents choking of oil production, increases recovery rates by 10%, and is economically viable due to its robust and autonomous design, efficiently closing off undesired fluid phases without impairing oil flow.
Implementation Method 1
the first fluid flow restrictor is configured to impose substantially laminar flow characteristics on a fluid flowing through the restrictor
Implementation Method 2
the second fluid flow restrictor is configured to impose substantially turbulent flow characteristics on a fluid flowing through the restrictor
Implementation Method 3
The first fluid flow restrictor and the second fluid flow restrictor are configured to generate different pressure drops across them when a property of the fluid, such as viscosity, changes
Data Source
AI summary
A fluid flow control device serving as an inflow port from a fluid reservoir (R) to the interior of a production pipe (S) is in the form of a housing (3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i, 3j, 3k, 3l). The housing has a primary flow path (18) and a secondary flow path (19). The secondary flow path is in fluid communication with a chamber (B) in which is arranged an actuator (5) for a valve device (4), the valve device arranged to open and close the primary flow path. At least one flow restrictor (1,2) is arranged in the secondary flow path, the flow restrictor arranged to provide a pressure to chamber (B) sufficient to actuate the valve to an open position when the fluid flowing through the secondary flow path is oil, and a pressure sufficient to actuate the valve to a closed position when the fluid has a viscosity and/or density less than oil.