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A method and device for simulating dynamic discrete fractures in a reservoir

A technology for discrete fractures and oil reservoirs, which is applied in the field of dynamic discrete fracture simulation of oil reservoirs, which can solve the problem of large amount of calculation in the discrete fracture simulation method, and achieve the effect of improving efficiency.

Active Publication Date: 2017-10-17
PETROCHINA CO LTD
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Problems solved by technology

However, the disadvantage of the discrete fracture simulation method is that the calculation amount is relatively large.

Method used

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  • A method and device for simulating dynamic discrete fractures in a reservoir
  • A method and device for simulating dynamic discrete fractures in a reservoir
  • A method and device for simulating dynamic discrete fractures in a reservoir

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[0044] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0045] figure 1 It shows a method for simulating dynamic discrete fractures of reservoirs provided by the embodiment of the present application, such as figure 1 As shown, the method includes the following steps:

[0046] Step S101: performing grid division on the reservoir to obtain the grid of the reservoir;

[0047] Step S102: furth...

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Abstract

The embodiment of the present application discloses a method and device for simulating dynamic discrete fractures in a reservoir. The method includes: performing grid division on the reservoir to obtain a grid of the reservoir; further dividing the grid of the reservoir into multiple level grid; calculate the conductivity between matrix and matrix, matrix and fracture, fracture and fracture, and calculate the fluid exchange coefficient between reservoir and wellbore, and further obtain the pressure and saturation at each time step; establish water injection Discrimination criteria for fracture formation and dynamic extension during the process, and establish the coupling relationship between natural fractures, water injection dynamic fractures, and pressure fractures, and judge the fracture extension at different time points; use the extended new fractures as boundary conditions to dynamically divide the grid , at the same time assign the attribute information of the new fracture to the grid boundary to update the grid boundary; modify the reservoir and rock mechanics parameters, perform historical data fitting, and calculate the saturation and pressure at the current time step.

Description

technical field [0001] The present application relates to the technical field of numerical simulation of oil reservoirs, in particular to a method and device for simulating dynamic discrete fractures of oil reservoirs. Background technique [0002] In the field of reservoir seepage calculation, the fracture simulation method is widely used. There are mainly two fracture simulation methods in the prior art, namely, dual-porosity and double-permeability simulation methods and discrete fracture simulation methods. [0003] The dual-porosity and dual-permeability method uses the equivalent continuum model to simulate the coupling effect of fractures and matrix, and uniformizes the fractures. In this model, rock-matrix voids provide the main storage space for fluids, while the main fluid flow occurs in fractures and between fractures. Fluid exchange between the fracture and the matrix is ​​described using a "transport equation" or "shape factor". Although the calculation effic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 雷征东田昌炳石成方王文环王方彭缓缓侯建锋李军诗王锦芳
Owner PETROCHINA CO LTD
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