Density-Based Inflow Control for Oil-Water Fluid Discrimination
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Solution Overview
Problem
Existing viscosity-based inflow control devices in the resource recovery industry lack sufficient discriminatory action for fluid flow control, failing to differentiate between different fluids effectively.
Innovation Solution
An inflow control device with a valve responsive to pressure inputs and a fluid discriminator that utilizes differential pressure taps to distinguish between fluids, adjusting flow based on the density of the fluid, with specific configurations to optimize the pressure differential for oil and water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If viscosity-based flow control devices are used, then flow control function is provided, but discriminatory action between different fluids is insufficient
Solution Approach 1:
The patent changes the control parameter from viscosity-based to density-based by using a pressure-sensitive element that responds to differential pressure caused by density differences between fluids. The discriminator structure creates different pressure drops for oil and water based on their density ratio, enabling the valve to differentiate fluids through density rather than viscosity.
Solution Approach 2:
The patent employs hydraulic principles by using fluid pressure differentials to actuate the valve. The pressure-sensitive element (diaphragm or piston) responds to hydraulic pressure differences created by the discriminator, which generates different backpressures for different fluids based on their density. This hydraulic actuation mechanism provides automatic fluid discrimination without mechanical complexity.
2Measurement precision
If density-based discrimination is implemented, then fluid discrimination capability is improved, but device complexity increases
Solution Approach 1:
The discriminator is segmented into multiple flow paths with different flow regimes - a first flow path with a first flow regime and a second flow path with a second flow regime. This segmentation creates different pressure drops for different fluids based on their density, enabling discrimination while keeping each individual path relatively simple in structure.
Solution Approach 2:
Different portions of the discriminator structure are designed with different flow characteristics - one path optimized for laminar flow and another for turbulent flow. This local differentiation in flow regime creates density-dependent pressure differentials that enable fluid discrimination without requiring complex overall device architecture.
3Productivity
If conventional flow control is used, then basic flow management is achieved, but control efficiency for prioritizing target fluids is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the pressure-sensitive element continuously monitors the differential pressure signal from the discriminator and automatically adjusts the valve position accordingly. When water is detected (higher density), the backpressure increases, causing the valve to close and reduce flow. This automatic feedback control prioritizes oil production without manual intervention, improving control efficiency and productivity.
Solution Approach 2:
The inflow control device is self-regulating through the density-based pressure differential mechanism. The discriminator automatically generates the appropriate pressure signal based on the fluid present, and the pressure-sensitive valve automatically responds to this signal without external control systems. The device serves itself by using the physical properties of the flowing fluid to control its own operation, enhancing productivity and reliability.
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 device automatically adjusts flow rates to prioritize the desired fluid, enhancing control and efficiency by discriminating between target and nontarget fluids, reducing cavitation under high pressure conditions.
Implementation Method 1
the taps experiencing a differential pressure that is different for water and for oil flowing through the discriminator
Implementation Method 2
a valve responsive to pressure inputs
Implementation Method 3
reducing cavitation under high pressure conditions
Data Source
AI summary
An inflow control device including a valve responsive to pressure inputs, and a fluid discriminator having a first structure that supports a first flow regime and a second structure that changes the flow regime to exhibit a higher pressure, a first pressure tap at the first structure and a second pressure tap at the second structure, the taps experiencing a differential pressure that is different for water and for oil flowing through the discriminator, and the first and second pressure taps connected to the valve. A borehole system, including a borehole in a subsurface formation, a string in the borehole, and an inflow control device disposed within or as a part of the string.