Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for calculating hydraulic fracturing inclined crack induced stress of shale reservoir

A technology for hydraulic fracturing and shale reservoirs, applied in the directions of calculation, special data processing applications, instruments, etc., can solve the problem of inability to determine the stress reversal zone induced by hydraulic fracturing inclined fractures in shale reservoirs, etc.

Active Publication Date: 2016-05-04
SOUTHWEST PETROLEUM UNIV
View PDF3 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the technical problem to be solved in this application is that the prior art cannot determine the induced stress inversion zone of hydraulically fractured inclined fractures in shale reservoirs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for calculating hydraulic fracturing inclined crack induced stress of shale reservoir
  • Method for calculating hydraulic fracturing inclined crack induced stress of shale reservoir
  • Method for calculating hydraulic fracturing inclined crack induced stress of shale reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0135] In this embodiment, the method for calculating the induced stress of inclined fractures by hydraulic fracturing in shale reservoirs is applied, and the details are as follows:

[0136] The basic parameters of in-situ stress and inclined fractures of the shale reservoir are as follows:

[0137] Table 1 Basic Physical Parameters

[0138]

[0139] Such as image 3 As shown, the σ x The change of induced stress value along the direction of fracture width x. It can be seen that as the distance from the fracture center increases, σ x The value shows an overall downward trend. When the fracture dip angle is 30°, σ x The induced stress value first decreases sharply to a negative value, and then gradually increases to zero; when the fracture inclination angle is 60° and 90°, σ x The induced stress value gradually decreases until it tends to zero, and the range of the curve changes from sharp to gentle. σ from different fracture dip angles x From the comparison of the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The application discloses a method for calculating a hydraulic fracturing inclined crack induced stress of a shale reservoir. The method comprises the following steps of: 1, collecting basic parameters of the shale reservoir and a hydraulic crack; 2, establishing a calculation model of the hydraulic fracturing inclined crack induced stress of the shale reservoir; and 3, calculating the hydraulic fracturing inclined crack induced stress of the shale reservoir, and by analyzing change rules of the inclined crack induced stress in an x crack width direction and a z crack length direction, determining a stress inverted region. According to the method disclosed by the application, aiming at the inclined crack induced stress formed in the horizontal well fracturing process of the shale reservoir, simulation is carried out, and an induced stress field distribution condition under the inclined crack is analyzed, so that guidance is provided for optimization of a hydraulic crack position where the complex crack is formed by a fracturing horizontal well of the shale reservoir, and a fracturing effect of the shale gas reservoir is improved.

Description

technical field [0001] The application belongs to the field of oil and gas field development, and in particular relates to a method for calculating the induced stress of oblique fractures in hydraulic fracturing of shale reservoirs. Background technique [0002] The reservoirs of shale gas reservoirs are generally characterized by low porosity and low permeability, and the resistance to gas flow is greater than that of conventional natural gas. All wells need to be hydraulically fractured to be recovered. The strong heterogeneity of shale reservoirs and the characteristics of low permeability reservoirs require a sufficiently large volume of stimulation in the fracturing state in order to obtain high production. When the reservoir itself is not capable of forming complex fractures through fracturing, the induced stress field generated by hydraulic fracturing fractures can promote the formation of volumetric fractures. At present, researchers have carried out extensive resea...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 曾凡辉郭建春李超凡
Owner SOUTHWEST PETROLEUM UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com