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DCB (double-cantilever beam) fracture toughness testing device

A fracture toughness and testing device technology, applied in the field of oil and gas drilling engineering, can solve the problems of inability to measure the propagation velocity, fracture displacement and extension length of I-type cracks

Active Publication Date: 2018-07-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can predict the bending geometry of hydraulic fracturing fractures in the formation space during the initiation and expansion of hydraulic fracturing, so that the distribution of fracture width and friction of fracture surface can be calculated, which provides a scientific basis for the performance design of fracturing proppant and fracturing fluid. The foundation of the fracturing proppant can ensure that the fracturing proppant is effectively distributed on the surface of the water fracture fracture, forming an effective oil drainage channel, instead of being blocked at the crack opening of the well wall and causing the fracturing operation to fail. However, this invention cannot measure the extension of type I fractures Data such as velocity, crack displacement and elongation length

Method used

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  • DCB (double-cantilever beam) fracture toughness testing device

Examples

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Embodiment 1

[0094] In order to achieve the above object, the technical scheme adopted in the present invention is:

[0095] Such as figure 1 As shown, a double cantilever beam fracture toughness test device is used in the double cantilever beam fracture toughness test method for inducing intrinsic sharp cracks. The structure includes a mechanical transmission system, an electronic acquisition system and a data terminal processing system. The mechanical transmission system is fixed on the bearing beam 11, the electronic collection system is directly connected to the mechanical transmission system, and the data terminal processing system is directly connected to the electronic collection system.

[0096] The mechanical transmission system mainly includes a sample clamping member, a tension transmission mechanism and a pressure transmission mechanism.

[0097] The sample clamping member is arranged laterally on the upper part of the tension transmission member and axially on the lower part ...

Embodiment 2

[0164] The difference from the examples is that three samples of the research plate were prepared, and three evaluation tests were carried out to ensure the accuracy of the test results and evaluation results. The test methods and steps were the same as in Example 1.

Embodiment 3

[0166] In order to achieve the above object, the technical scheme adopted in the present invention is:

[0167] Such as figure 2 As shown, the double cantilever beam fracture toughness test method of the double cantilever beam fracture toughness test device induced intrinsic sharp cracks, which includes the following steps in order:

[0168] Step 1: Prepare rectangular thin slate slabs from rocks, end-face treatment, and draw conductive grids;

[0169] Step 2: The device clamps the rock slab, and preloads the calculated tensile force and axial force;

[0170] Step 3: The slab is left to stand for 10-15 minutes, and the external tensile force is applied continuously and evenly until the slab produces Type I fracture cracks, and the external force loading part of the experiment is completed;

[0171] Step 4: Collect and store the longitudinal potential change of crack expansion, the lateral displacement potential change of crack expansion, the tension potential change, the pr...

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Abstract

The invention discloses a DCB (double-cantilever beam) fracture toughness testing device. The device comprises a mechanical transmission system, an electronic collection system and a data terminal processing system, wherein the electronic collection system is connected with the mechanical transmission system and the data terminal processing system; the mechanical transmission system comprises a sample clamping component, a tension transmission mechanism and a pressure transmission mechanism; the electronic collection system comprises a potential data collection card, an LVDT (linear variable differential transformer) displacement sensor, a pressure sensor and a tension sensor; the data terminal processing system is used for processing, filtering and sampling the collected data. The DCB fracture toughness testing device is simple, easy to understand and convenient to operate, a test result is accurate, data such as extension speed, cracking displacement, extension length and the like ofa type I fracture can be recorded and measured effectively, and a method foundation is provided for design research of rock fracture toughness.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling engineering, and in particular relates to a double cantilever beam fracture toughness testing device. Background technique [0002] The properties of rock materials are very important to understand the process of rock fragmentation. For example, rock material properties need to be considered in rock mechanical design issues such as drilling, blasting, tunneling, cutting and crushing of rock masses. Fracture mechanics is the study of the properties of rock materials and thus makes an important contribution to practical rock engineering design. In recent years, many experts and scholars have discussed the related issues of rock fracture toughness through theoretical analysis and experimental testing methods. Fracture mechanics is an engineering discipline whose purpose is to quantitatively describe the fracture process of a complete material structure initiated by a crack. Fracture me...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/06G01N1/28
CPCG01N1/28G01N3/06G01N3/066G01N3/08G01N2203/0017G01N2203/0019G01N2203/0617
Inventor 金衍卢运虎陈勉董京楠洪国斌杨向同侯冰周舟林伯韬王世永
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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