Shale gas reservoir fracturing well group production dynamic numerical simulation method

Abstract

The invention discloses a shale gas reservoir fracturing well group production dynamic numerical simulation method. The method comprises the following steps of generating a shale reservoir and a fracturing horizontal well three-dimensional geologic body and performing unstructured tetrahedral mesh discretization; establishing a shale gas reservoir multi-stage fracturing horizontal well comprehensive seepage mathematical model; constructing a fully implicit numerical model of the comprehensive seepage mathematical model based on a control volume finite element method; establishing a fully implicit multi-stage fracturing horizontal well numerical well model based on tetrahedral mesh discretization, embedding the fully implicit numerical model, and constructing a complete multi-system synchronous simultaneous solution matrix; and performing iterative solution on the multi-system synchronous simultaneous solution matrix, and analyzing the influence of Langmuir volume and the like on the production dynamic of the shale gas reservoir fracturing well group. According to the method, the defects of an existing shale gas reservoir two-dimensional simulator are overcome, the physical interlayer heterogeneity of the shale reservoir and the longitudinal extension expansion characteristics of the hydraulic fracturing fracture are comprehensively considered, and accurate simulation and prediction of the production dynamic of the three-dimensional development fracturing well group in the three-dimensional deep shale reservoir are realized.

Description

technical field [0001] The invention relates to the technical field of exploration and development of shale gas reservoirs, in particular to a numerical simulation method for production dynamics of fracturing well groups in shale gas reservoirs. Background technique [0002] At present, my country has initially formed localized shale gas development technology, which can support the development and utilization of shale gas resources shallower than 3500m. However, there are still many problems to be solved for the scale-effective development of deep shale with a burial depth of more than 3500 m. The development practice of shale gas reservoirs shows that the volume fracturing technology of horizontal wells with long well intervals is the key to obtain the industrial productivity of shale gas reservoirs. However, due to the large difference in physical properties between deep shale layers, the production method of planar fracturing and horizontal well groups targeting the mai...

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Problems solved by technology

However, the above-mentioned numerical simulation methods generally use two-dimensional or pseudo-three-dimensional grids to discretize the spatial grids of shale reservoirs and fractured horizontal wells, without considering the characteristics of longitudinal flow and longitudinal extension and expansion of fractures, and it is difficult to realize Simulation and prediction of production performance of fracturing well groups in shale stereoscopic development

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