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A method for calculating the stress field generated by hydraulic fracturing based on dislocation theory

A hydraulic fracturing and theoretical calculation technology, which is applied in earthwork drilling, design optimization/simulation, electrical and digital data processing, etc., can solve the problems of stress change and other problems, and achieve the effect of reducing the amount of calculation and improving the calculation efficiency.

Active Publication Date: 2022-07-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, since the formation of multi-stage hydraulic fracturing fractures is affected by many different factors, it is difficult to directly obtain the stress change under the influence of various factors from the existing fracturing theory

Method used

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  • A method for calculating the stress field generated by hydraulic fracturing based on dislocation theory
  • A method for calculating the stress field generated by hydraulic fracturing based on dislocation theory
  • A method for calculating the stress field generated by hydraulic fracturing based on dislocation theory

Examples

Experimental program
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Embodiment 1

[0043] S1. Determine the basic overview of the target well, including basic parameters and whether it is staged or refracted. In this example, the elastic modulus of the reservoir rock is 40GPa and the Poisson's ratio is 0.2. Models of a single-stage horizontal well and a single horizontal well are established respectively. The single horizontal well is divided into 20 sections, and each section is 75m long.

[0044] S2. Determine the basic parameters of hydraulic fracturing fractures, including fracture location coordinates, basic size and quantity, etc. In this example, the number of fractures in a single-stage horizontal well is taken as 1 and 3 respectively for comparison; the fracture position coordinates can first determine the wellbore trajectory according to any series of three-dimensional coordinate points of the measured wellbore, and then according to any coordinate of the fracture Calculate its three-dimensional coordinates; the height and length limits of the frac...

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Abstract

The invention relates to a method for calculating the stress field induced by hydraulic fracturing based on dislocation theory. Based on the geological parameters of the target well and the basic parameters of hydraulic fractures of staged fracturing or repeated fracturing, such as fracture position coordinates, basic size and quantity, etc. The dislocation theory is used to characterize the tensile or shear failure of hydraulic fractures by dislocations occurring in different directions on the hydraulic fracture surface, and the induced stress field caused by the tensile or shearing of each hydraulic fracture is calculated separately. Finally, the superposition theory is used. The regional induced stress field is obtained by superimposing the induced stress fields of multiple hydraulic fractures. This method reasonably characterizes different types of hydraulic fractures through fracture surface dislocation, and can accurately obtain the induced stress field under the joint action of multiple hydraulic fractures.

Description

technical field [0001] The invention relates to deep energy development and related engineering fields, including oil and gas resource exploitation, coal mining and geothermal development. Background technique [0002] Multi-stage hydraulic fracturing and its refracturing are important means to efficiently develop deep oil and gas resources. In staged hydraulic fracturing, each fracturing section contains several hydraulic fractures, and hydraulic fracturing of another fracturing section is usually carried out after fracturing one fracturing section according to a certain fracturing sequence. Because the formation of hydraulic fractures in the previous section will disturb the in-situ stress, it will affect the initiation and propagation of hydraulic fractures in the subsequent fracturing section. Therefore, an in-depth understanding of the in-situ stress changes under the disturbance of hydraulic fractures can help to optimize the hydraulic fracturing design to obtain the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/28E21B43/26G06F119/14
CPCG06F30/28E21B43/26G06F2119/14
Inventor 张丰收曹澍天王小华安孟可赵峦啸
Owner TONGJI UNIV