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Natural-fracture-containing tight-reservoir volume-fracturing tree-shape random fracture net description method

A technology of natural fractures and volume fracturing, which is applied in instrumentation, design optimization/simulation, calculation, etc., and can solve problems such as the indescribable shape of tree-like fracture network

Inactive Publication Date: 2016-04-20
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0013] The object of the present invention is a dendritic random fracture network description method for volume fracturing of tight reservoirs containing natural fractures, which is used to solve the existing conditions of natural fractures The indescribable problem of tree-like fracture network in which main fractures and multi-level random secondary fractures coexist in volumetric fracturing in lower tight reservoirs

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  • Natural-fracture-containing tight-reservoir volume-fracturing tree-shape random fracture net description method

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Embodiment Construction

[0048] The present invention is described further below:

[0049] The description method of volume fracturing tree-like random fracture network in tight reservoirs with natural fractures:

[0050] Step 1. Select a rock sample without natural fractures that is relatively close to the physical properties of the reservoir rock at the point to be pressed, and conduct an indoor hydraulic fracturing simulation experiment according to the three-dimensional stress at the point to be pressed;

[0051] Step 2. Use large-scale industrial CT to scan the images of cracks in the fracturing rock samples in the laboratory, divide the cracks generated on the rock samples into n segments from the root to the tip of the cracks, and calculate the fractal dimension D of the cracks in each segment by using the box dimension method i , i=1,2,3...n, count and calculate the average rotation angle θ between each crack;

[0052] Step 3, determine that the main fracture is the longest fracture in the sc...

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Abstract

The invention relates to a natural-fracture-containing tight-reservoir volume-fracturing tree-shape random fracture net description method. Rock samples which do not contain natural fractures are selected to carry out a hydraulic fracturing simulation experiment; the fractal dimension each section of fracture is calculated, and the average rotation angle of each fracture is counted and calculated; major fractures and secondary fractures are determined, and the secondary fractures are graded; statistics is carried out to the number and the total length of each grade secondary fractures of a first section of fracture closest to the root of the fracture; a generator main stem pitch number is given, generator parameters of a fractal system are determined, and a generator production formula of the multistage random tree-shape fracture net is obtained; the length, the width and the height of each major fracture are calculated, and the proportional relation between the width and the height of each grade secondary fractures and the width and the height of the major fractures is set; a three-dimensional tree-shape fracture net figure is generated; the section number and the bifurcate grade of natural fractures which can be opened are determined; and a three-dimensional tree-shape fracture net figure of the stratum containing natural fractures is generated. According to the invention, the shape of the natural-fracture-containing tight-reservoir volume-fracturing tree-shape random fracture net can be described.

Description

technical field [0001] The invention relates to the volume fracturing technology of tight reservoirs, in particular to a description method for volume fracturing of tight reservoirs containing natural fractures in tree-like random fracture network. Background technique [0002] Due to the characteristics of low porosity and low permeability, tight reservoirs must adopt large-scale volume fracturing technology to achieve industrial development. Volume fracturing technology refers to the application of segmented multi-cluster perforation technology and fracture diversion technology, and the use of large displacement to pump low-viscosity fracturing fluid to increase the net pressure in the fracture. The higher net pressure in the fracture promotes the opening of natural fractures and brittle fractures. The rock produces shear slip, which forces the formation of first-order secondary fractures on both sides of the artificial main fractures. At the same time, it continues to bra...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 冯福平胡超洋艾池金春玉王轩滨韩旭
Owner NORTHEAST GASOLINEEUM UNIV
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