Fractured reservoir simulation
AssigneeSchlumberger Technology Corporation
InventorHussein Mustapha
Life of this patent
Estimating the term…
Abstract
Simulating fluid flow in a fractured reservoir includes generating a grid for a fractured reservoir model that includes a fracture and a matrix to obtain a generated grid. Cross-flow equilibrium elements are generated based on the generated grid. A volume expansion parameter is selected for the cross flow equilibrium elements, and used, along with physical properties, pore volume and transmissibility multipliers. The physical properties are included in the cross flow equilibrium elements. A fluid flow in the fractured reservoir model is simulated using the pore volume and transmissibility multipliers and a fracture relative permeability curve to obtain a result, which is presented. The fluid flow is calculated for the cross flow equilibrium elements.
Claims20
A method for increasing computational efficiency of a computing system during calculation of fluid fluxes in a reservoir model, the method comprising:
- generating a set of grid blocks based on a hybrid grid mesh;
- selecting a set of scaling factors that include a pore volume scaling factor and a fracture hydraulic transmissivity scaling factor;
- determining whether a fracture aperture distribution is isotropic wherein:
- based on a determination the fracture aperture distribution is isotropic, a scaled cross-flow equilibrium-cross-flow equilibrium (CFE-CFE) relative permeability is calculated for each grid block in the set of grid blocks, or based on a determination the fracture aperture distribution is not isotropic, a fracture relative permeability that is transversal to a cross-flow equilibrium (CFE) is calculated for each grid block in the set of grid blocks,
- the set of scaling factors are used when calculating the scaled CFE-CFE relative permeability for each grid block in the set of grid blocks, and
- the fracture aperture distribution is isotropic when changes in hydraulic transport properties are equal in a plurality of directions in the set of grid blocks;
- calculating fluid fluxes of the set of grid blocks using the scaled CFE-CFE relative permeability;
- and
- presenting the fluid fluxes.
A system comprising:
- one or more processors;
- memory;
- instructions stored in the memory and executable by at least one of the one or more processors to increase computational efficiency of the system during calculation of fluid fluxes in a reservoir model by performing operations comprising:
- generating a set of grid blocks based on a hybrid grid mesh;
- selecting a set of scaling factors that include a pore volume scaling factor and a fracture hydraulic transmissivity scaling factor;
- determining whether a fracture aperture distribution is isotropic wherein:
- based on a determination the fracture aperture distribution is isotropic, a scaled cross-flow equilibrium-cross-flow equilibrium (CFE-CFE) relative permeability is calculated for each grid block in the set of grid blocks, or based on a determination the fracture aperture distribution is not isotropic, a fracture relative permeability that is transversal to a cross-flow equilibrium (CFE) is calculated for each grid block in the set of grid blocks,
- the set of scaling factors are used when calculating the scaled CFE-CFE relative permeability for each grid block in the set of grid blocks, and
- the fracture aperture distribution is isotropic when changes in hydraulic transport properties are equal in a plurality of directions in the set of grid blocks;
- calculating fluid fluxes of the set of grid blocks using the scaled CFE-CFE relative permeability;
- and
- presenting the fluid fluxes.
A non-transitory computer readable storage medium storing computer readable program code for causing a computing system to perform operations for increasing computational efficiency of the computing system during calculation of fluid fluxes in a reservoir model, the operations comprising:
- generating a set of grid blocks based on a hybrid grid mesh;
- selecting a set of scaling factors that include a pore volume scaling factor and a fracture hydraulic transmissivity scaling factor;
- determining whether a fracture aperture distribution is isotropic wherein:
- based on a determination the fracture aperture distribution is isotropic, a scaled cross-flow equilibrium-cross-flow equilibrium (CFE-CFE) relative permeability is calculated for each grid block in the set of grid blocks, or based on a determination the fracture aperture distribution is not isotropic, a fracture relative permeability that is transversal to a cross-flow equilibrium (CFE) is calculated for each grid block in the set of grid blocks,
- the set of scaling factors are used when calculating the scaled CFE-CFE relative permeability for each grid block in the set of grid blocks, and
- the fracture aperture distribution is isotropic when changes in hydraulic transport properties are equal in a plurality of directions in the set of grid blocks;
- calculating fluid fluxes of the set of grid blocks using the scaled CFE-CFE relative permeability;
- and
- presenting the fluid fluxes.
Dependencies are inferred from the claim text.