Four-dimensional dynamic ground stress simulation method

Abstract

The invention discloses a four-dimensional dynamic ground stress simulation method which comprises the following steps: S1, establishing a three-dimensional geologic model; S2, establishing a three-dimensional oil reservoir model and predicting a three-dimensional pore pressure field and a temperature field at different stages by utilizing production/injection dynamic parameters; S3, establishing a three-dimensional ground stress model; S4, forming an initial ground stress field; S5, establishing a four-dimensional dynamic ground stress model according to an initial three-dimensional ground stress filed model by taking the dynamic three-dimensional pore pressure field and the temperature field; S6, making a seepage-stress coupled solution and analyzing and calculating dynamic ground stress and pore elasticity parameters used for guiding wells engineering practice. The method has the beneficial effects that the changing situations of the dynamic ground stress and the pore elasticity parameters in an oil and gas exploitation process can be accurately reflected, so as to provide guidance for refracturing of old wells and drilling and completion operation of new wells.

Description

technical field [0001] The invention relates to the field of oil and gas resource development, in particular to a four-dimensional dynamic ground stress simulation method. Background technique [0002] In the process of oil and gas resource development, the in-situ stress model is mainly a three-dimensional static model, focusing on describing the current in-situ stress distribution state. However, for compaction and subsidence during oil and gas development, pressure distribution in salt rock formations, pore pressure depletion or stress inversion near salt domes or faults, and reservoirs with obvious anisotropy characteristics, the conventional 3D static geostress model It is impossible to accurately describe the current state of in-situ stress or predict the change of in-situ stress in a certain period of time in the future based on past production or injection dynamics. Therefore, establishing a high-precision four-dimensional dynamic in-situ stress model based on produ...

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Problems solved by technology

However, for compaction and subsidence during oil and gas development, pressure distribution in salt rock formations, pore pressure depletion or stress reversal near salt domes or faults, and reservoirs with obvious anisotropy characteristics, the conventional 3D static geostress model It is impossible to accurately describe the current state of in-situ stress or predict the change of in-situ stress in a certain period of time in the future based on past production or injection dynamics

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