Method for predicting fractured reservoir stress evolution based on fractured continuum model

A technology of model prediction and continuum, applied in design optimization/simulation, instrumentation, electrical digital data processing, etc., can solve the problems that the influence of induced stress has not been raised, and achieve the effect of reliable reference and guidance, and promoting development

Active Publication Date: 2020-02-04
SOUTHWEST PETROLEUM UNIV
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Summarizing the current research, it can be found that a research method that considers the influence of n

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  • Method for predicting fractured reservoir stress evolution based on fractured continuum model
  • Method for predicting fractured reservoir stress evolution based on fractured continuum model
  • Method for predicting fractured reservoir stress evolution based on fractured continuum model

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[0076] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0077] A method for predicting the stress evolution of fractured reservoirs based on the fracture continuum model, comprising the following steps:

[0078] First, establish a simulated physical model based on geological parameters, construction parameters, boundary conditions, and initial conditions, and determine basic parameters. The geological parameters and construction parameters include initial opening of natural fractures, initial matrix permeability, initial porosity, and elastic modulus. , Poisson's ratio, bottom hole pressure.

[0079] Secondly, based on the basic parameters and the fracture continuum model, a random distribution model of natural fractures is established, and the permeability of the grid corresponding to natural fractures is calculated. The fracture continuum model has been disclosed in the literature Teklu Hadgu, Elena Kalin...

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Abstract

The invention discloses a method for predicting fractured reservoir stress evolution based on a fractured continuum model, and the method comprises the following steps: building a simulated physical model based on geological parameters, construction parameters, boundary conditions and initial conditions, and determining basic parameters; establishing a natural fracture random distribution model, and calculating permeability of grids corresponding to natural fractures; establishing a stress balance equation and a continuity equation based on elastic mechanics, a finite element method and a seepage theory, and substituting the permeability into the stress balance equation and the continuity equation; and establishing a non-planar hydraulic fracture, a discrete stress balance equation and a continuous seepage equation based on a finite element method to obtain a discrete form of the discrete equation and the continuous equation, and calculating the distribution state of reservoir stress corresponding to each age limit. According to the method, stress prediction can be carried out in the later period of fractured reservoir development, a reliable guiding effect is provided for repeatedfracturing design and infilled well design, and development of oil and gas development theoretical research can be promoted.

Description

technical field [0001] The invention relates to the technical field of stress evolution in the later stage of fractured reservoir development, in particular to a method for predicting the stress evolution of fractured reservoirs based on a fracture continuum model. Background technique [0002] In oil and gas production, with the deepening of development, the pore pressure in the reservoir gradually decreases. At this time, due to the pore pressure gradient generated by the heterogeneity of reservoir pore pressure distribution, the original reservoir stress distribution is induced to change. In conventional reservoir research, the reservoir is generally considered as a porous media elastic body. When studying the coupling law of fluid flow and geological stress in the poroelastic model, it is generally believed that there are only three main directions of fluid flow. But the reason for fluid flow is due to the presence of a pressure gradient. For reservoirs like shale whe...

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Application Information

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IPC IPC(8): G06F30/23G06F119/14
Inventor 胡永全王强赵金洲任岚赵超能赵金
Owner SOUTHWEST PETROLEUM UNIV
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