Method for representing water absorption expansibility of shale microstructure by using small-angle neutron scattering experiment

A technology of neutron scattering and experimental characterization, which is applied in material analysis, measuring devices, and instruments using wave/particle radiation, can solve problems such as retention mechanism, distribution, and water-rock interaction, and achieve a rich understanding of theory, short time effect

Pending Publication Date: 2021-10-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

However, the retention mechanism, distribution and water-rock interaction of a large amount of fracturing fluid in the pore space of shale reservoirs are still unclear.

Method used

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  • Method for representing water absorption expansibility of shale microstructure by using small-angle neutron scattering experiment
  • Method for representing water absorption expansibility of shale microstructure by using small-angle neutron scattering experiment
  • Method for representing water absorption expansibility of shale microstructure by using small-angle neutron scattering experiment

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Embodiment Construction

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, the embodiments of the present invention provide a method for characterizing the water-swellability of shale microstructure by using small-angle neutron scattering experiments, comprising the following steps:

[0029] S1 Prepare the shale particle sample to be tested. The specific operation steps are: select the shale sample to be tested, grind it into shale particles with a grinder, and dry it.

[0030] Among them, it should be noted that the obtained shale particles need to be obtained from similar positions in the same core column, in order to eliminate the influence of shale heterogeneity. Specifically, the particle size of the shale particles is 177-500 μm, and they are dried in an oven at a drying temperature of 6...

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Abstract

The invention provides a method for characterizing the water absorption expansibility of a shale microstructure by using a small-angle neutron scattering experiment, which comprises the following steps of: performing the small-angle neutron scattering experiment on a to-be-detected shale particle sample to obtain original data; preparing a fluid with the scattering length density of zero, and fully infiltrating the shale particle sample to be detected in the fluid; performing a small-angle neutron scattering experiment on the fully infiltrated to-be-detected shale particle sample to obtain original data; calculating the processed data through an Irena macros plug-in in the IGOR Pro software, and obtaining pore structure information of the to-be-detected shale particle sample before infiltration and after infiltration; and comparing the pore structure information of the to-be-detected shale particle sample before and after infiltration to obtain the water absorption expansibility of the shale in the microscopic state. The technical scheme provided by the invention has the beneficial effects that a brand new experimental technology for representing the shale microscopic expansibility is provided, the understanding theory of the water-rock action on the shale microscopic expansibility is enriched, and small-angle neutron scattering has the advantages of no damage, high efficiency, short time consumption and the like.

Description

technical field [0001] The invention relates to the technical field of unconventional natural gas experiments, in particular to a method for characterizing the water-absorbing swelling properties of shale microstructures by means of small-angle neutron scattering experiments. Background technique [0002] The influence of water-rock interaction on the microstructure of shale still has many problems to be solved urgently. For example, the exploitation of shale gas needs to inject a large amount of pressure fluid containing proppant under high pressure to generate fractures. Taking shale gas exploitation in the United States as an example, only 6% to 10% of the fracturing fluid flows back on average, and the fracturing fluid that has not flowed back is believed to remain in the shale matrix, fractures, and other types of pore spaces through various mechanisms. . However, the retention mechanism, distribution and water-rock interaction of a large amount of fracturing fluid in ...

Claims

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Application Information

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IPC IPC(8): G01N23/202
CPCG01N23/202
Inventor 温建江杨五星孙梦迪包汉勇梁榜
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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