Experimental device and method for researching long-term soaking corrosion effect of shale and supercritical carbon dioxide

A carbon dioxide, experimental device technology, applied in measuring devices, using stable tension/pressure to test material strength, instruments, etc., can solve the problems of not taking into account the influence of deep shale stress, inability to deform and real-time monitoring of micro-fracture characteristics, etc.

Pending Publication Date: 2021-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no special equipment for this experimental research at home and abroad. Most of the existing research adopts the method of natural immersion, without considering the influence of deep shale stress and temperature on the experimental results; Real-time monitoring of deformation and microfracture characteristics during long-term immersion-dissolution

Method used

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  • Experimental device and method for researching long-term soaking corrosion effect of shale and supercritical carbon dioxide
  • Experimental device and method for researching long-term soaking corrosion effect of shale and supercritical carbon dioxide
  • Experimental device and method for researching long-term soaking corrosion effect of shale and supercritical carbon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A deep shale supercritical carbon dioxide immersion-dissolution experiment device, the device is mainly composed of triaxial stress loading system, carbon dioxide pumping system, electromagnetic induction heating system, 16-channel core deformation measurement system, embedded acoustic emission monitoring system and The data acquisition system constitutes, such as figure 2 and image 3shown. The triaxial stress loading system is used to simulate the stress environment of deep shale; the carbon dioxide injection system is used to pump carbon dioxide into the acid-resistant self-balancing triaxial chamber; the electromagnetic induction heating system is used to simulate the stress environment of deep shale. high temperature environment; the 16-channel core deformation measurement system is used to measure the axial and radial deformation characteristics of samples under different immersion times; the embedded acoustic emission monitoring system is used to monitor the lo...

Embodiment 2

[0055] Utilize the device of embodiment 1 to carry out the method for deep shale supercritical carbon dioxide long-term immersion-dissolution experiment, comprise the following steps:

[0056] Step 1: Sample processing and preparation, first process the downhole full-diameter core into a cylinder with a diameter of 50mm and a height of 100mm, observe the surface bedding of the sample and the development of natural fractures, make records and weigh them;

[0057] Step 2: If figure 1 As shown in , mark lines are drawn on the surface of the sample, and 16 strain gauges are attached to the specified positions in turn to test the radial and axial deformation at different positions during the soaking process of the sample;

[0058] Step 3: After the strain gauge is firmly pasted, place the sample in the triaxial chamber and fix it. At the same time, place the acoustic emission probe on the upper and lower ends of the sample, and lead the wire out to the monitor through the right end...

Embodiment 3

[0065] Using the device in Example 1 and the method in Example 2, long-term carbon dioxide immersion experiments were carried out on the Longmaxi Formation marine shale in the Sichuan Basin. Two rock samples were selected for the experiment, and the experimental sample numbers were WBL1 and WBL2.

[0066] The strain curve of shale-supercritical carbon dioxide immersion is shown in Figure 4 . The experimental results show that during the long-term immersion of supercritical carbon dioxide, the axial and radial deformation of shale increases significantly, accompanied by significant microfractures. For example, a very significant change of WBL1 during the soaking process is that a fracture runs through the shale surface, as shown in Figure 5 shown. Electron microscope analysis before immersion shows that there are no natural cracks in this area. The most obvious feature before and after immersion on the shale surface is that some minerals dissolve and disappear, and new por...

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Abstract

The invention discloses an experimental device and method for researching the long-term soaking corrosion effect of shale and supercritical carbon dioxide. The invention belongs to the technical field of shale gas exploitation. The device mainly comprises a triaxial stress loading system, a carbon dioxide pumping system, an electromagnetic induction heating system, a 16-channel rock core deformation measuring system, an embedded acoustic emission monitoring system and a data acquisition system. The device belongs to special equipment for analyzing the interaction of rock and critical carbon dioxide, can monitor the corrosion, deformation and micro-fracture characteristics of the shale under the condition of long-term soaking of the supercritical carbon dioxide in real time, and provides an experimental platform for the research of the supercritical carbon dioxide fracturing production increasing mechanism of the shale.

Description

technical field [0001] The invention relates to the technical field of shale gas exploitation, in particular to an experimental device and method for studying the long-term immersion-corrosion effect of shale and supercritical carbon dioxide. Background technique [0002] At present, with the completion of shale gas demonstration areas such as Fuling, Changning, and Weiyuan, my country's shale gas development is gradually advancing to the deep layer. The so-called deep shale refers to shale gas reservoirs with a buried depth exceeding For example, Shanshan and other areas have deep shale gas reserves as high as 400 billion cubic meters, with broad prospects for exploration and development. However, compared with medium-shallow shale gas, deep shale generally has prominent problems such as high fracture pressure, large two-way horizontal stress difference, enhanced formation shaping, underdeveloped bedding and natural fractures, and low hydraulic fracture complexity. As a res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/06G01N3/12
CPCG01N3/02G01N3/06G01N3/12G01N2203/0003G01N2203/0019G01N2203/0048G01N2203/024G01N2203/06G01N2203/0658
Inventor 王海涛左罗蒋廷学仲冠宇卞晓冰李双明肖博卫然
Owner CHINA PETROLEUM & CHEM CORP
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