Microfluidic Sensor Flushing with Piston-Driven Fluid Control
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Solution Overview
Problem
Existing fluid analysis tools face challenges in accurately measuring properties of reservoir fluids due to issues like phase change, contamination, and inefficient flushing, particularly in downhole environments where traditional laboratory methods are impractical.
Innovation Solution
A microfluidic system with a piston-controlled flow line, microfluidic sensor, and flushing fluid reservoir is used to measure fluid properties, allowing for efficient flushing and minimizing contamination by alternatingly pushing and pulling a flushing fluid across the sensor, reducing the volume of fluid required for cleaning and enabling accurate measurements in harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional laboratory methods are used for fluid analysis, then comprehensive fluid property measurement is achieved, but device complexity and space requirements increase significantly
Solution Approach 1:
The system divides the fluid analysis process into separate functional modules: a microfluidic flow line for fluid transport, a piston for pressure control, and a microfluidic sensor for measurement. This segmentation allows each component to perform its specific function efficiently, reducing overall system complexity while maintaining measurement capabilities.
Solution Approach 2:
The microfluidic sensor is integrated within the microfluidic flow line, with the piston positioned to control pressure at a specific location along the flow line. This nested arrangement allows multiple functions (fluid transport, pressure control, and measurement) to be compactly organized in a hierarchical structure, minimizing space requirements while preserving comprehensive fluid analysis capabilities.
2Reliability
If flushing fluid is used to clean the microfluidic flow line, then contamination is reduced, but fluid volume consumption increases
Solution Approach 1:
The piston alternates between pushing flushing fluid through the microfluidic flow line and allowing the flow line to drain. This periodic push-pull action efficiently removes contaminants from the flow line using minimal flushing fluid volume, as the fluid is recirculated and the process is repeated until cleaning is complete, rather than requiring continuous large-volume flushing.
Solution Approach 2:
The flushing process is integrated into the continuous operation of the fluid analysis system. The piston can switch between analyzing formation fluid and flushing the flow line without requiring system shutdown or external intervention, maintaining continuous useful action while using minimal additional fluid for cleaning purposes.
3Ease of operation
If piston is used to control fluid pressure, then fluid flow control is improved, but device complexity increases
Solution Approach 1:
The piston serves multiple functions within the system: it controls fluid pressure in the microfluidic flow line, drives flushing fluid through the system for cleaning, and can potentially function as a sampling mechanism. This multi-functionality reduces the need for separate pressure control devices, valves, and pumping mechanisms, thereby simplifying the overall device architecture while maintaining excellent fluid flow control capabilities.
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 microfluidic system effectively measures properties like density and viscosity with reduced contamination and fluid volume, enabling rapid and accurate analysis of reservoir fluids, even in extreme downhole conditions, by utilizing a small volume of solvent to flush out previous fluids, thus stabilizing dewpoint measurements efficiently.
Implementation Method 1
a flushing fluid reservoir configured to deliver a flushing fluid into the microfluidic flow line in response to a pressure gradient exerted by the piston
Data Source
AI summary
A method and an apparatus for characterizing a fluid provide for flowing a sample fluid through a microfluidic flow line and subsequently flushing the flowline with flushing fluid alone or together with heating and/or exposure to a pulsating electromagnetic field. A tracer fluid is injected and tracked in a microfluidic line based on known properties of the tracer fluid.