Modeling method for compact sandstone reservoir three-dimensional fracability model

A technology of tight sandstone reservoirs and modeling methods, which is applied in the modeling field of 3D fracturability models of tight sandstone reservoirs, can solve problems such as the inability to provide 3D reservoir brittleness evaluation, shorten the drilling cycle, improve the effect, The effect of shortening the recovery time

Active Publication Date: 2015-12-09
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0004] The existing brittleness and fracturing evaluation methods can only provide the brittleness evaluation of the reservoir at the drilling position, but can...

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  • Modeling method for compact sandstone reservoir three-dimensional fracability model
  • Modeling method for compact sandstone reservoir three-dimensional fracability model
  • Modeling method for compact sandstone reservoir three-dimensional fracability model

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[0037] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0038] A modeling method for a three-dimensional fracturing model of a tight sandstone reservoir, which includes the following steps:

[0039] S1. Use a high temperature and high pressure triaxial rock mechanics testing system to test the uniaxial and triaxial rock mechanical strength parameters of sandstone cores, including elastic modulus E, Poisson's ratio v, and internal friction angle et al. Determination of tensile strength, mode I and mode II fracture toughness K of tight sandstone samples by Brazilian disc experiment IC and K IIC , to establish the relationship between the internal friction angle, type I and type II fracture toughness and rock mechanical characteristic parameters:

[0040] K IC =0.271+0.107σ t

[0041] K IIC =0.0956σ n +0.1383σ t +0.027(1)

...

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Abstract

The invention relates to a modeling method for a compact sandstone reservoir three-dimensional fracability model. The method comprises the following steps: S1, establishing a relation formula among an internal friction angle, I type and II type crack fracture toughness and the parameter of sandstone mechanical characteristics; S2, establishing a shale fracability evaluation model which comprehensively considers an elastic parameter, the internal friction angle, the critical strain energy release rate and fracture toughness; S3, adopting a support vector machine algorithm to obtain a cluster analysis mode between the reservoir fracability and the elastic parameter; S4, adopting the cluster analysis mode to obtain a reservoir three-dimensional elastic parameter data body, and establishing the multi-scale compact sandstone reservoir three-dimensional fracability evaluation model based on the core, the borehole and the reservoir of multiple scales. According to the method, the fracability of an arbitrary space position in the compact sandstone reservoir can be obtained, a sweet spot with high fracability can always be drilled when drilling a compact sandstone gas well, blindness of well location selection is avoided, and the fracture modification effect and the yield after fracture are improved.

Description

technical field [0001] The invention belongs to the technical field of tight sandstone oil and gas development, in particular to a modeling method for a three-dimensional fracturing model of tight sandstone reservoirs. Background technique [0002] my country has huge reserves of tight sandstone oil and gas reservoirs. In tight sandstone reservoirs such as Sugeli Gas Field and Xuwu in western Sichuan, the method of horizontal well staged volumetric fracturing has been used to achieve commercial production. Compared with foreign countries, tight sandstone reservoirs in my country have poor physical properties, extremely low porosity and permeability, tight reservoirs, complex lithology, and alternate mixed beds of sandstone and mudstone. Due to the great differences in the internal physical properties and heterogeneity of tight sandstone reservoirs in my country, and the wellbore trajectory design mainly focuses on drilling sweet spots, and the geological sweet spot is not ne...

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Application Information

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IPC IPC(8): E21B43/26G06F17/50
Inventor 朱海燕郭建春李慧汪浩威
Owner SOUTHWEST PETROLEUM UNIV
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