Unlock instant, AI-driven research and patent intelligence for your innovation.

True triaxial loading hydraulic fracturing strain measurement device for large-scale shale-like samples

A hydraulic fracturing and strain measurement technology, which is applied in the direction of measuring devices, using stable tension/pressure testing material strength, instruments, etc., can solve the problems of different samples and single measured strain, so as to reduce interference and realize effective The effect of monitoring

Active Publication Date: 2021-09-03
CENT SOUTH UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of various factors, the method of comprehensively measuring strain is still insufficient when performing true triaxial hydraulic fracturing. For example, when measuring the corresponding strain of the sample under triaxial hydraulic fracturing conditions, only fixed Measure the strain at a certain point of the sample, and the sticking position of the strain gauge is fixed, the strain gauge can only be pasted vertically, the measured strain is single, and the strain in different directions of the sample is different during the deformation process

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
  • True triaxial loading hydraulic fracturing strain measurement device for large-scale shale-like samples
  • True triaxial loading hydraulic fracturing strain measurement device for large-scale shale-like samples
  • True triaxial loading hydraulic fracturing strain measurement device for large-scale shale-like samples

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as Figure 1-Figure 4 As shown, Embodiment 1 of the present invention provides a true triaxial loading hydraulic fracturing strain measurement device for large-scale shale-like samples, including a box-shaped mold surrounded by a plurality of mold plates 1 and a loading plate for loading 2. Among them, the mold plate 1 is provided with a plurality of installation holes 3, which are arranged in a matrix of multiple rows and columns. In addition, the middle part of the mold plate 1 is also provided with a separate installation hole 3, and each installation hole 3 is provided with a detachable Plug piece 4. The device also includes a plurality of strip sheets 5, the two ends of the strip sheets 5 are respectively provided with a spring clamping structure 6, and the spring clamping structures 6 can be clamped and fixed in any mounting hole 3, so that the strip sheets 5 fit together on the inner wall of the mold plate 1.

[0028] After the box-shaped mold is assemble...

Embodiment 2

[0034] refer to Figure 5 , taking the measurement of the four side strains of a 300*300*300mm sample as an example:

[0035]Sample preparation: Attach the strip sheet 5 to the four mold plates 1 on the side through its own spring clamping structure 6, all in the form of a cross, first install and clamp vertically, the length is 300mm, and the width is 15mm , a strip-shaped sheet 5 with a thickness of 2mm, and then install and clamp two sections of strip-shaped sheet 5 with a length of 142.5mm, a width of 15mm, and a thickness of 2mm perpendicular to the strip-shaped sheet 5, and finally connect the bottom surface and the mold plate 1 of the bottom surface with the The side mold plate 1 is engaged, the bolts adjacent to the side mold plate 1 are tightened, the pre-prepared shale material is poured into the assembled box mold, and after a period of time, demoulding and maintenance are carried out to obtain the strain required for the test. of samples.

[0036] Loading: Accord...

Embodiment 3

[0038] refer to Figure 5 with Image 6 , taking the measurement of the top, bottom and two sides of a 200*200*200mm sample as an example:

[0039] Sample preparation: the strip sheet 5 with a diamond-shaped tip 9 is attached to the mold plate 1 on the side through its own spring clamping structure 6, and they all cross diagonally and vertically. The mold plate 1 on the top and bottom surfaces is similar to that of Example 2 processing, and finally the mold plate 1 is assembled, and the pre-prepared shale material is poured into the assembled box-shaped mold. After a period of time, demoulding and curing are performed to obtain the samples required for testing the strain.

[0040] Loading: Paste the strain gages in the strip-shaped installation groove of the sample according to a certain distance and in the way of half-bridge connection, lead the relevant lines along the strip-shaped installation groove, and attach the loading plate 2 to the sample for three times. The shaft...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a true triaxial loading hydraulic fracturing strain measuring device for large-scale shale-like samples, which includes a box-shaped mold surrounded by a plurality of mold plates and a loading plate for loading, and the mold plate is provided with A plurality of mounting holes, each of which is provided with a detachable plug, and the device also includes at least one strip-shaped sheet, and a spring clamping structure is provided at both ends of the strip-shaped sheet, and the The spring clamping structure can be clamped and fixed in any of the mounting holes, so that the strip-shaped sheet is attached to the inner side wall of the mold plate. The invention realizes the installation of the strain gauges in different positions and directions of the sample, and can measure the strain more comprehensively under the condition of true triaxial loading hydraulic fracturing.

Description

technical field [0001] The invention relates to the field of rock mechanics, in particular to a true triaxial loading hydraulic fracturing strain measuring device for large-scale shale-like samples. Background technique [0002] In recent years, due to the massive consumption of conventional energy, people have paid more and more attention to the exploitation and utilization of unconventional energy. The main way to develop unconventional energy is to transform the reservoir through hydraulic fracturing, so the process of hydraulic fracturing It is very necessary to study the change of rock mechanical properties and fracture propagation. In order to better simulate the rock stress distribution at the mining site, many researchers use a true triaxial loading system to load the sample to study the change of the mechanical properties of the sample under the true triaxial loading condition. [0003] In the hydraulic fracturing test, in order to better study the fracture propaga...

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 Patents(China)
IPC IPC(8): G01N3/02G01N3/04G01N3/12
CPCG01N3/02G01N3/04G01N3/12
Inventor 曹函高强孙平贺赵钰陈裕朱浩龙
Owner CENT SOUTH UNIV