Paleo Zone Reservoir Modeling via Hysteresis Scanning Curves
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Solution Overview
Problem
Current methods for modeling oil/water or gas/water interfaces in hydrocarbon reservoirs fail to accurately capture the physics of paleo zone formation and fluid distribution, leading to inefficiencies in hydrocarbon extraction and enhanced oil recovery (EOR) processes.
Innovation Solution
A computer-implemented method that determines current steady-state pressure distribution by iteratively adjusting hysteresis scanning curves using paleo phase and current phase pressures, allowing for the generation of accurate oil/water and gas/water interfaces, which are then used for hydrocarbon management and reservoir simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to model oil/water or gas/water interfaces, then the modeling process is simple, but the accuracy of paleo zone fluid distribution and pressure distribution is insufficient
Solution Approach 1:
The method performs preliminary determination of paleo phase pressure distribution and paleo water level before current phase analysis. By establishing the historical pressure field and paleo contact position first, the method creates a foundation for accurately modeling current fluid distribution, resolving the contradiction between simplicity and accuracy by preparing essential data in advance
Solution Approach 2:
The method introduces hysteresis scanning curves as an intermediary tool to bridge paleo phase pressures and current phase pressures. These curves serve as a mathematical mediator that captures the complex fluid behavior and pressure transitions, enabling accurate interface modeling without requiring direct complex physical measurements
2Reliability
If accurate paleo zone modeling is implemented, then hydrocarbon recovery estimation improves, but computational time and processing requirements increase
Solution Approach 1:
The method pre-determines paleo phase pressure distribution and paleo water level before conducting current phase simulations. By establishing these historical parameters in advance, the method reduces the computational burden during actual reservoir simulation, as the complex paleo zone characteristics are already characterized and can be used as input constraints
Solution Approach 2:
The method uses determined current steady-state pressure distribution and interface positions to validate and refine the hysteresis scanning curves. This feedback mechanism ensures accuracy in hydrocarbon recovery estimation while optimizing computational efficiency by iteratively improving the model only where necessary
3Measurement precision
If hysteresis scanning curves are iteratively determined, then pressure distribution accuracy improves, but the complexity of the computational method increases
Solution Approach 1:
The method uses hysteresis scanning curves as a mathematical intermediary that simplifies the relationship between paleo and current phase pressures. These curves provide a structured framework for iteration, transforming a complex multi-variable problem into a more manageable form that can be solved systematically
Solution Approach 2:
The method iteratively adjusts parameters within the hysteresis scanning curves to match observed pressure data. By focusing iteration on specific curve parameters rather than the entire pressure field, the method achieves accurate pressure distribution while controlling computational complexity through targeted parameter optimization
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 enables more precise hydrocarbon management by accurately modeling paleo zone fluids and pressure distribution, improving the estimation of recoverable resources and reducing water production risks, thereby enhancing EOR processes and hydrocarbon extraction efficiency.
Implementation Method 1
determining, by iteratively determining hysteresis scanning curves using the paleo phase pressure distribution and the current phase pressures, the current steady-state pressure distribution
Data Source
AI summary
A methodology for modeling oil/water or gas/water paleo zone reservoir properties for hydrocarbon management is provided. Reservoir simulations in a subsurface, such as in an oil region bounded by a gas cap and a water region, may use an initial reservoir simulation model. The methodology determines one or both of the oil/water or gas/water interfaces to honor the equilibrium state of the subsurface. The current configuration of the subsurface may be the result of one or more processes, such as a drainage process and an imbibition process, each of which have different associated curves reflecting the physical phenomena of the fluid/rock properties in the subsurface. The methodology honors the physical process, including comporting with the different curves and with the available data, in order to determine the current state of the subsurface, including one or both of the oil/water or gas/water interfaces.