Method, device, and computing apparatus for calculating fracturing fluid leak-off volume in reservoir matrices

A reservoir matrix fracturing fluid loss calculation apparatus, characterized by comprising:

• An acquisition module configured to obtain pressure data from multiple measurement points along the core during the fracturing fluid damage testing of the core;
• Determination module, configured to determine the fracturing fluid invasion damage length of the core based on the pressure data;
• Permeability Calculation Module, configured to calculate the variation parameter of the reservoir matrix permeability to fracturing fluid as a function of penetration depth, based on the fracturing fluid invasion damage length;
• Fluid Loss Depth Calculation Module, configured to determine the fracturing fluid loss depth within the reservoir formation based on the fracturing fluid density, fracturing fluid viscosity, and the depth-dependent permeability variation parameter of the reservoir matrix to the fracturing fluid. The resulting fracturing fluid loss depth is:
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• In which:
• Dloss is the fracturing fluid loss depth, cm;
• ρfluid is the density of the fracturing fluid, g/cm3;
• Km(i) is the permeability at a position corresponding to a penetration depth of i, 10−3 μm2;
• i is the penetration depth of the fracturing fluid into the reservoir matrix, cm;
• Pfracture is the fluid pressure inside the fracture, MPa;
• Pformation is the reservoir pore pressure, MPa;
• μfluid is the viscosity of the fracturing fluid, mPa·s;
• Krock is the intrinsic permeability of the reservoir matrix, 10−3 μm2;
• a, b are the dimensionless regression coefficients of the porosity-permeability relationship for the reservoir matrix;
• Total fluid loss calculation module:
• configured to calculate the total fluid loss of the fracturing fluid based on the average fracture height and fracture length of the primary hydraulic fracture, the average fracture height and fracture length of the branch fractures, and the fracturing fluid loss depth within the reservoir.