An integrated simulation method for hydraulic fracturing flowback production process coupled with shale gas reservoirs

Abstract

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.

Description

technical field [0001] The invention relates to a shale gas reservoir hydraulic fracturing simulation method, in particular to an integrated simulating method for coupled shale gas reservoir hydraulic fracturing flowback production process. Background technique [0002] Hydraulic fracturing has become an effective method for oil and gas reservoirs, especially shale gas reservoir stimulation, but for a long time, most of the hydraulic fracturing simulation software only considered that during the hydraulic fracturing process, the injection of fracturing fluid into the formation would lead to rock rupture and fracture expansion The characteristic change of the fracturing fluid does not consider the two-phase seepage relationship between the fluid in the formation and the fracturing fluid, and only considers the injection fracturing simulation of a single fluid. As a result, most fracturing simulations cannot reflect the impact of fracturing fluid injection on the formation matr...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an integrated simulation method for hydraulic fracturing flowback production process coupled with shale gas reservoirs. This method solves the problem that the existing simulation method does not take into account the two-phase seepage relationship, and combines discrete fracture models and dynamic fractures. The design considers the two-phase flow of fracturing fluid and shale gas in the formation, and realizes the integrated simulation of hydraulic fracturing-flowback-production process of shale gas reservoirs

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