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Method and device for simulating dynamic discrete cracks of oil deposit

A technology of discrete fracture and simulation method, which is applied in the field of reservoir numerical simulation, can solve the problem of large calculation amount of discrete fracture simulation method, and achieve the effect of improving efficiency

Active Publication Date: 2015-03-04
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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  • Method and device for simulating dynamic discrete cracks of oil deposit
  • Method and device for simulating dynamic discrete cracks of oil deposit
  • Method and device for simulating dynamic discrete cracks of oil deposit

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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

An embodiment of the invention discloses a method and a device for simulating dynamic discrete cracks of an oil deposit. The method comprises the following steps of performing the mesh generation on the oil deposit so as to obtain meshes of the oil deposit; further dividing the meshes of the oil deposit into multiple secondary meshes; calculating conductivities between matrices, between each matrix and cracks as well as between the cracks, calculating a fluid exchange coefficient between a storage layer and a pitshaft, and further obtaining pressure and saturability under every time step; building discriminant criteria of crack formation and dynamic extension in the water injection process, building coupling relationships between natural cracks and water injection dynamic cracks as well as between the natural cracks and pressure cracks, and judging crack extension situations at different time points; dynamically dividing the meshes by means of taking an extended new crack as a boundary condition, and meanwhile assigning the attribute information of the new crack to a mesh boundary so as to update the mesh boundary; correcting mechanical parameters of the oil deposit and rocks, performing the historical data fitting, and calculating the saturability and pressure situation of the present 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G06F17/50
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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