Downhole Inflow Valve Using Dual Restrictors for Breakthrough Control
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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 leading to initial production losses and limited reservoir contact, with existing autonomous ICDs being either ineffective or requiring external control mechanisms.
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 autonomous ICDs are used to prevent gas and water breakthrough, then coning effects are mitigated, but initial oil production is choked and recovery is delayed
Solution Approach 1:
The device changes the flow regime parameter from turbulent to laminar by using a long, narrow tortuous path instead of a direct flow path. This parameter change allows the device to differentiate between oil and water/gas based on their different flow characteristics, enabling selective prevention of unwanted fluids while maintaining oil production
Solution Approach 2:
The invention uses a tortuous fluid path with curves and bends instead of a straight path. This curved geometry creates different flow dynamics for different fluid types, allowing the device to exploit the differences between oil and water/gas flow behavior to achieve selective control
2Manufacturing precision
If external control mechanisms are used to adjust flow area, then flow control precision is improved, but device complexity and cost increase
Solution Approach 1:
The device performs self-control by automatically adjusting the effective flow area based on the fluid type present. The tortuous path geometry inherently responds to fluid properties, eliminating the need for external actuators, sensors, or control systems while maintaining precise flow control
Solution Approach 2:
The invention removes the external control mechanism from the system entirely. Instead of adding complex actuators and control systems, the device uses a passive geometric structure that automatically responds to fluid properties, simplifying the overall system while maintaining control 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
The solution effectively increases oil production and recovery by autonomously controlling fluid flow, preventing choking and enhancing reservoir contact, with a significant increase in production efficiency and cost-effectiveness.
Implementation Method 1
a first fluid flow restrictor (1) configured to generate a substantially laminar flow
Implementation Method 2
a second fluid flow restrictor (2) configured to generate a substantially turbulent flow
Implementation Method 3
utilizing the pressure change in the chamber (B) that occurs when a property of the fluid (e.g. viscosity) changes
Data Source
AI summary
A fluid flow control system 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.