Acoustic emission detection method of supercritical carbon dioxide fracturing phase change

A carbon dioxide and detection method technology, which is applied in the detection of supercritical carbon dioxide phase transition based on acoustic emission signals, supercritical carbon dioxide phase transition detection, and can solve problems such as the complexity of the fracturing process

Active Publication Date: 2018-11-30
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, SC-CO 2 The fracturing process is complex, which is the key pro

Method used

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  • Acoustic emission detection method of supercritical carbon dioxide fracturing phase change
  • Acoustic emission detection method of supercritical carbon dioxide fracturing phase change
  • Acoustic emission detection method of supercritical carbon dioxide fracturing phase change

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Embodiment 1

[0077] This embodiment provides that the present invention provides an acoustic emission detection method for supercritical carbon dioxide fracturing phase change, the process of which is as follows figure 1 As shown, the acoustic emission detection method specifically includes the following steps:

[0078] Step 1: Prepare the partition specimen, its structure is as follows figure 2 shown, including the following steps:

[0079] Mix cement and sand at a ratio of 1:1, prepare a cube specimen with a specification of 300mm×300mm×300mm, and place it for 15 days to obtain cement matrix 5;

[0080] Drilling a wellbore hole, the wellbore hole is used to pass the wellbore 1, wherein the diameter of the wellbore hole is 20mm and the length is 150mm;

[0081] Drill 12 probe holes, of which the diameter of the carbon well hole is 20mm and the length is 25mm;

[0082] Cut the acoustic emission wire groove on the surface of the test piece;

[0083] Reserve a space with a length of 10 ...

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Abstract

The invention provides an acoustic emission detection method of supercritical carbon dioxide fracturing phase change. The detection method comprises the following steps: preparing a partition specimen; carrying out supercritical carbon dioxide fracturing experiment on the partition specimen and detecting change of acoustic emission signals when the supercritical carbon dioxide generates phase change in the fracturing process to obtain a standard curve of the acoustic emission signals when the supercritical carbon dioxide generates phase change; preparing a sample specimen; carrying out supercritical carbon dioxide fracturing experiment on the sample specimen, detecting the acoustic emission signals of the supercritical carbon dioxide in the fracturing process, and obtaining the phase change characteristics of the supercritical carbon dioxide fracturing process. The detection method of the supercritical carbon dioxide fracturing phase change is a judgment method of the occurrence situation of the supercritical carbon dioxide fracturing phase change and is capable of obtaining the phase change characteristics of the supercritical carbon dioxide in the supercritical carbon dioxide fracturing process.

Description

technical field [0001] The invention relates to a detection method for the phase transition of supercritical carbon dioxide, in particular to a detection method for judging the phase transition of supercritical carbon dioxide according to an acoustic emission signal, and belongs to the technical field of tight rock oil and gas resources development. Background technique [0002] Tight rock oil and gas reservoirs are widely distributed in China, with huge resources. Supercritical carbon dioxide (SC-CO 2 ) has a density close to that of a liquid, a viscosity close to that of a gas, a strong solvating ability, a larger diffusion coefficient than a liquid, good mass transfer, and zero surface tension. Because of SC-CO 2 These advantages, in recent years, SC-CO 2 Fracturing has received widespread attention and has broad application prospects in the development of tight rock reservoirs. [0003] However, SC-CO 2 The complexity of the fracturing process is a key problem restr...

Claims

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Application Information

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IPC IPC(8): G01N29/14
CPCG01N29/14
Inventor 张广清赵辉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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