Reservoir Flowpath Identification via Electrical Resistivity Imaging
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Solution Overview
Problem
In enhanced oil recovery (EOR), existing methods struggle to monitor and evaluate the impact of reservoir treatments on flow patterns in real-time, often relying on breakthrough to observation wells and lacking continuous assessment of fluid flow paths and pore geometry characteristics.
Innovation Solution
A method and system for monitoring and evaluating the impact of treatment schemes on hydrocarbon production by measuring and comparing the quantities of formation material in produced fluids before and after altering the treatment, allowing for real-time evaluation of flowpath geometry and effectiveness in enhancing hydrocarbon recovery, using a processing unit and fluid monitoring systems to analyze the produced fluid for dissolved rock material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional tracer materials (radioactive isotopes, compounds like potassium iodide) are used to determine fluid origination, then knowledge of fluid flow path can be obtained, but monitoring can only occur after breakthrough to observation wells, preventing real-time assessment
Solution Approach 1:
The patent replaces conventional mechanical/chemical tracer methods with electrical resistivity imaging technology. Instead of using radioactive isotopes or chemical compounds that require breakthrough detection, the system uses electrical signals to continuously map subsurface flow paths in real-time, eliminating the time delay inherent in traditional tracer methods
Solution Approach 2:
The electrical resistivity imaging system provides continuous monitoring of flow paths throughout the treatment process, rather than providing discrete measurements only after tracer breakthrough. This continuous action allows real-time assessment and adjustment of EOR operations
2Productivity
If treatment schemes are altered to enhance hydrocarbon recovery from untreated areas, then recovery effectiveness may improve, but the impact on flow path geometry and pore space characteristics cannot be evaluated without advanced monitoring
Solution Approach 1:
The electrical resistivity imaging system serves multiple functions: it tracks fluid flow paths, characterizes pore space geometry, evaluates treatment effectiveness, and monitors changes in formation properties. This multi-functionality provides comprehensive information needed to assess both productivity improvements and flow path geometry changes
Solution Approach 2:
The system provides real-time feedback on flow path evolution and treatment impact, allowing operators to assess whether altered treatment schemes are successfully accessing previously untreated reservoir areas and to make informed adjustments to optimize hydrocarbon recovery
Data Source
AI summary
Systems and methods for analyzing produced fluids in a mature water flood (or EOR scheme) and determining whether the introduction of an EOR agent, such as a chemical or a gas additive, or some other alteration in treatment, is enhancing the recovery of hydrocarbon from parts of the reservoir otherwise untouched by injected fluids. The monitoring can be used to identify subtle changes in the produced fluid caused by their flow through different pore structures. In a carbonate formation for example, ions and salts from the rock fabric are dissolved into the reservoir fluids, whether they are water or oil. These can be detected by various fluid analysis and particularly water analysis methods. The changes in reservoir fluid paths associated with the injection of an EOR agent are detected in the observation well.