31 results about "Discrete fracture model" patented technology

The invention discloses an integrated simulation method coupling the hydraulic fracturing, flowback and production processes of a shale gas reservoir. The method comprises the steps of first, settinga fracture potential expanding path on the basis of stratum natural fracture distribution, and the magnitude and the direction of ground stress; second, dividing a space into unstructured grids by adopting triangular units with all the potential fractures as the grid boundaries; third, using a gas-water two-phase discrete fracture model based on the unstructured grids to calculate the pressure onand the saturation of fractures and substrate grids in the fracturing, flowback and production processes; fourth, simulating the fracture expanding process; fifth, judging the intersection action of the fractures when one fracturing fracture expands forwards and meets one natural fracture; and sixth, simulating the flowback and production processes after the fracturing expanding process simulationis finished. According to the integrated simulation method coupling the hydraulic fracturing, flowback and production processes of the shale gas reservoir, the discrete fracture model and dynamic fractures are used in combination, flow of two phases including fracturing fluid and shale gas in the stratum is taken into consideration, and it is implemented that the shale gas reservoir hydraulic fracturing flowback production process is integrally simulated.

The invention relates to a fractured reservoir reverse imbibition recovery prediction method. The method is characterized by, establishing a fractured medium model with isolated cracks, irregularity of matrix block cutting and diversity of contact between the cracks and matrixes being taken into consideration; and carrying out imbibition process and rule numerical simulation of the fractured medium model based on a numerical simulation method of a discrete crack model and coupling between the cracks and matrixes, and predicating recovery change. The method realizes comprehensive simulation of imbibition process and rules of fractured reservoir, studies change of remaining oil in the fractured medium under the function of imbibition predication, realizes precise description of the cracks, can simulate influence of the isolated cracks, is accurate in predication result, and meets the defects of a conventional numerical simulation method.

The present invention relates to an integrated numerical simulation method of pressure-production with full coupling of reservoir flow, which comprises the following steps in sequence: (1) establishing structured reservoir grids and initial units of fractures; (2) calculating artificial fractures during the fracturing process Half-length, width distribution of artificial fractures, fluid pressure distribution in artificial fractures, matrix oil phase pressure distribution and matrix liquid phase saturation distribution; (3) Calculation of reservoir pressure distribution and reservoir water saturation distribution during oil well flowback-production process ; (4) Calculate the productivity of the oil well. The invention adopts a structured grid and an embedded discrete fracture model, and the use of the structured grid can facilitate the processing of reservoir boundary problems. The embedded discrete fracture model has the advantages of simple grid division, fast calculation, and easy processing of complex fractures. The invention is used for simulating the fracturing, flowback and production process of oil reservoir development, and obtains the production dynamics of the oil well closer to the actual situation through the integration, so as to guide the fracturing construction and the design of the production system.