Microfluidic Pore Structure Analysis for Fluid Trapping Quantification
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Solution Overview
Problem
During energy industry operations like hydraulic fracturing, water-based fluids can cause fluid retention issues due to trapping in the formation, leading to reduced hydrocarbon permeability and prolonged production time, especially in tight formations where it's difficult to discern and quantify the trapping mechanism.
Innovation Solution
A method and system that involve injecting a water-based fluid into a substrate with fabricated fluid channels mimicking the formation's pore structure, followed by injecting oil to displace the fluid, imaging, and determining the remaining fluid to estimate trapping volume, which helps in deciding on chemical treatments and fluid effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water-based fluids are injected into the formation during hydraulic fracturing, then fracture stimulation and hydrocarbon production are enhanced, but fluid trapping occurs in the pore space reducing permeability and productivity
Solution Approach 1:
The patent creates microfluidic copies of formation pore structures on solid substrates that replicate the geometric and topological characteristics of actual reservoir pores. These simplified models allow systematic study of fluid trapping mechanisms without the complexity of field conditions, enabling prediction of fluid behavior in real formations and optimization of fracturing fluids to minimize trapping while maintaining productivity
Solution Approach 2:
The patent replaces traditional mechanical core flooding methods with microfluidic systems that use controlled fluid injection through fabricated pore structures. This substitution enables precise control of flow rates, pressures, and fluid compositions while allowing direct optical observation of trapping mechanisms, replacing indirect mechanical measurements with visual detection methods
2Reliability
If outcrop cores are used to confirm fluid trapping, then existence of damage can be verified, but it is difficult to clearly discern trapping mechanism and accurately determine trapping location and volume
Solution Approach 1:
The patent segments the complex three-dimensional pore structure into two-dimensional cross-sectional views that can be directly imaged through the transparent substrate. This segmentation allows systematic analysis of trapping at different locations along the flow path, enabling identification of specific zones where trapping occurs and quantification of trapped fluid volumes in discrete pore regions
Solution Approach 2:
The patent uses dye-colored fluids to visually distinguish between injected water-based fluids, native formation fluids, and trapped fluids within the pore structure. This color differentiation enables direct observation and mapping of trapping mechanisms, allowing researchers to clearly identify where and how fluids are trapped without complex analytical procedures
3Productivity
If high production rates are used to clean up trapped fluids, then fluid removal is accelerated, but significant time is still required even at high rates especially in tight formations
Solution Approach 1:
The patent uses microfluidic modeling to perform preliminary analysis of trapping mechanisms and predict cleanup behavior before actual field production begins. By studying simplified pore structures under controlled conditions, researchers can identify optimal production rates and timing strategies that minimize total cleanup time while avoiding excessive pressure gradients that might cause additional formation damage
Solution Approach 2:
The patent enables systematic variation of flow rates and fluid compositions in periodic sequences to optimize cleanup efficiency. By alternating between high-rate flushing and lower-rate stabilization periods, the system can effectively remove trapped fluids while maintaining formation integrity, reducing total cleanup time compared to continuous high-rate production
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
This approach allows for systematic analysis of fluid trapping, enabling effective evaluation of fluid behavior and potential chemical treatments to mitigate trapping issues, thereby improving hydrocarbon production rates and reducing fluid retention time.
Implementation Method 1
The apparatus includes a reservoir channel having a pore structure... injecting a water-based fluid into the reservoir channel... injecting oil into an inlet of the reservoir channel
Implementation Method 2
injecting oil into an inlet of the at least one fluid channel until at least a selected amount of the injected oil exits the channel
Data Source
AI summary
An embodiment of a method of evaluating fluid trapping in an earth formation includes injecting a water-based fluid into at least one fluid channel fabricated on a substrate, the at least one fluid channel having a pore structure configured to represent a condition of an earth formation. The method also includes injecting oil into an inlet of the at least one fluid channel until at least a selected amount of the injected oil exits the channel, imaging the fluid channel and determining an amount of remaining fluid in the fluid channel after injection of the oil, the remaining fluid being an amount of the oil and/or an amount of the water-based fluid, and estimating a proportion of the total volume of the fluid channel occupied by the remaining fluid to determine an amount of fluid trapping in the pore structure. The method further includes analyzing the amount of fluid trapping.