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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)
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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 core experiments in the deep formations of each hydraulic fracture well, because the cost of drilling cores on a large scale is very expensive
Therefore, due to the lack of fracture toughness in deep formations, the use of various hydraulic fracturing models and the accuracy of model predictions are largely limited.

Method used

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

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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...

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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

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Application Information

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IPC IPC(8): G01N3/42G01N1/28G01N3/00
Inventor 陈勉金衍王怀英张广清
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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