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Mechanical property detection and data processing method for hydrate-containing sediments

A technology containing hydrates and data processing, applied in the direction of strength characteristics, using a stable shear force to test the strength of materials, measuring devices, etc. And other issues

Pending Publication Date: 2020-06-05
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) There is a deviation between the strain measured by strain gauges and other methods and the actual strain;
[0006] (3) According to the stress-strain relationship curve, the time point of structural failure of the hydrate-containing sediment during the triaxial loading process cannot be accurately obtained;
[0008] (5) It is impossible to dynamically obtain the location and extension path information of the crack

Method used

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  • Mechanical property detection and data processing method for hydrate-containing sediments
  • Mechanical property detection and data processing method for hydrate-containing sediments
  • Mechanical property detection and data processing method for hydrate-containing sediments

Examples

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Effect test

Embodiment 1

[0062] A method for detecting mechanical properties and data processing of hydrate-containing sediments, the specific steps are as follows:

[0063] 1. Install the sample to be tested and impose a simulated environment;

[0064] 2. Adjust the three-axis loading acoustic emission signal detection device to perform zero point calibration;

[0065] 3. On the control host, set the amplifier gain, the logic sequence of the switch on and off in the multi-channel signal switching module, and configure the parameters of the data acquisition module. The parameters include sampling mode, sampling frequency, sampling amplitude range, and sampling channel; open parameter acquisition analyzers, acoustic emission source locators and crack imagers;

[0066] 4. For the static detection process, start the motor when the sample to be tested is in a stable state, apply axial stress to shear the sample, and control the shearing rate of the sample by controlling the magnitude of the axial stress;...

Embodiment 2

[0074] Triaxial loading acoustic emission signal detection device. The triaxial pressure chamber is an important part of the triaxial loading device. It is composed of an upper metal cover, plexiglass and a base, and is a cylindrical space. The surrounding pressure system is used to control the pressure in the pressure chamber. The confining pressure system includes a pressure pump, a pressure display instrument and a regulating valve. By adjusting the relationship between the pressure in the pressure chamber and the external pressure, the pressure in the pressure chamber can be automatically compensated and stabilized. . The gear box is driven by a motor, and the pressure chamber can move from bottom to top through the transmission system to withstand axial pressure. At this time, the principal stress of the sample in the pressure chamber in the three directions cannot maintain balance, and the sample will be under the shear force. The axial stress can be controlled separatel...

Embodiment 3

[0077] Refer to attached Figure 3-7 The installation method of the designed sensor, the installation method of the acoustic emission sensor includes two aspects: the number of sensors and the installation location.

[0078] 1) When using 2 acoustic emission sensors, install the sensors on the inner metal wall surface of the sample holder (the end surface of the sensor is flush with the inner wall), and fix it with a magnetic adsorption fixture, which is divided into two ways: facing and non-facing. The axial position can be changed;

[0079] 2) When 4 acoustic emission sensors are used, they are divided into two pairs and fixedly installed on the inner metal wall surface of the sample holder (the end surface of the sensor is flush with the inner wall), and the upper sensor on the axial direction and the upper end surface of the cylindrical sample There needs to be a certain distance between the middle and lower layer sensors and the lower end surface of the cylindrical sampl...

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Abstract

The invention discloses a mechanical property detection and data processing method for hydrate-containing sediments, and the method comprises the following steps: installing a to-be-detected sample, and applying a simulation environment; adjusting the three-axis loading acoustic emission signal detection device to perform zero calibration; setting amplifier gain and the logic sequence of on-off ofswitches in the multi-channel signal switching module on the control host, configuring parameters of the data acquisition module, and turning on a parameter acquisition analyzer, an acoustic emissionsource locator and a crack imager; obtaining and processing static detection data, and obtaining and processing dynamic detection data; changing the particle size of sediments in the sample and the content of added clay, and repeatedly obtaining static and dynamic detection data; measuring the pore pressure and temperature of the sample in real time, calculating the hydrate content in the samplebased on the amount of consumed methane gas, and performing further calculating to obtain the hydrate saturation. According to the invention, the defect change trend can be dynamically reflected without additional energy; the fracture time point of the sample in the triaxial loading process can be accurately identified; and the method achieves the accurate positioning of defect locations.

Description

technical field [0001] The invention relates to a mechanical property detection and data processing method of a hydrate-containing sediment, belonging to the technical field of natural gas hydrate exploration and development. Background technique [0002] Natural gas hydrate is generally considered to be the most promising clean strategic resource in the future. Understanding the physical characteristics of natural gas hydrate is a necessary guarantee to expand the possibility of exploitation, ensure the safety of the exploitation process, and improve the exploitation efficiency. Carrying out petrophysical simulation experiments in the laboratory is an important means to obtain the physical characteristic parameters of hydrate-bearing sediments. It is necessary to simulate the occurrence environment of hydrate in nature in the experiment. Parameter expansion can accurately obtain the qualitative and quantitative relationship between these physical characteristic parameters a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N3/02
CPCG01N3/24G01N3/02G01N2203/0003G01N2203/0025G01N2203/005G01N2203/0218G01N2203/0246G01N2203/0256G01N2203/0658G01N2203/0676G01N2203/0694
Inventor 邢兰昌徐源葛新民魏周拓王斌宋钰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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