Method for computing rock II-type fracture toughness

A technology of fracture toughness and calculation model, applied in the directions of strength properties, preparation of test samples, measurement devices, etc., which can solve the problems of expensive core cost, unrepresentative type II fracture toughness test values, and unrealistic rock fracture toughness. and other problems to achieve the effect of improving the prediction accuracy

Inactive Publication Date: 2006-08-16
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF0 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The depth, composition and in-situ stress of the same layer in an oil field will change in the formation space, so the limited test values ​​of the type II fracture toughness of deep formation rocks are not widely representative
In addition, it is impractical to test the fracture toughness of rock by drilling cor

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 computing rock II-type fracture toughness
  • Method for computing rock II-type fracture toughness
  • Method for computing rock II-type fracture toughness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] The method for calculating rock II type fracture toughness among the present invention, comprises the following steps:

[0041] 1. For the oil layer and upper and lower interlayers in an oilfield development area, through the fracture toughness test under confining pressure conditions, the fracture toughness of rocks under different confining pressures is obtained. The specific operations are as follows:

[0042] 1) Use a diamond slicer to cut the rock core with a diameter of about 100mm into a disc-shaped rock core section with a thickness ranging from 30-50mm. , make the cylindrical surface relatively smooth, and then use a drill bit with a diameter of about 5mm to drill a through hole in the center of the disc, and finally process a suitable prefabricated initial crack through the central through hole. The ratio of the le...

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

A method for calculating II type breaking toughness of rock includes testing II type breaking toughness of rock, testing compression strength of rock, setting up calculation model of II type breaking toughness for rock and utilizing set-up model to calculate out II type breaking toughness of rock.

Description

technical field [0001] The invention relates to a method for calculating type II fracture toughness of rocks in deep formations. Background technique [0002] Rock fracture toughness is widely used in petroleum engineering, such as hydraulic fracturing, wellbore stability, joint rock formation stability, rock blasting, and rock drilling equipment design. [0003] Hydraulic fracturing, as the main measure of oil and gas stimulation, has been widely used in modern petroleum engineering, and plays an important role in the production of low permeability oil and gas reservoirs. At the same time, it has also played an important role in other fields such as geothermal resources and nuclear waste storage. The theory of hydraulic fracturing mechanics is based on the understanding of the crack propagation characteristics in deep formations. Since rock is a mainly brittle material, the theory of linear elastic fracture mechanics is often used to analyze the fracture propagation behav...

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
IPC IPC(8): G01N3/42G01N1/28G01N3/00
Inventor 陈勉金衍王怀英张广清
Owner CHINA UNIV OF PETROLEUM (BEIJING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap