A method for characterizing the occurrence state of water in shale by using frozen high-pressure mercury intrusion injection
A technology of occurrence state and shale, applied in the direction of permeability/surface area analysis, measuring device, suspension and porous material analysis, etc., can solve problems that have not yet developed effective, economical and convenient technical means Experimental technical methods and other issues to achieve the effect of convenient implementation and accurate characterization results
Active Publication Date: 2021-03-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology
Whether the fracturing fluid enters the shale matrix, the proportion of the fracturing fluid entering the pores of the matrix, and the distribution of the fracturing fluid’s storage space in the shale, these issues have not yet been studied with effective experimental techniques and methods, and have not yet been developed and mastered. Economical and convenient technical means to characterize the occurrence state of liquid in shale
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[0020] 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.
[0021] The basic principle of a method for characterizing the occurrence state of water in shale by using frozen high-pressure mercury intrusion described in the present invention is: the shale is placed in different humidity environments and water immersion conditions, and water will enter and fill the shale under the action of capillary force. Shale pores, so the filled pores will show a lower amount of mercury injection in the mercury injection experiment; in the comparison with the parallel sample drying group, the difference in the amount of mercury injection under the same pore throat diameter, its significance is The volume of water in the pore throat pores.
[0022] The basic principle of mercury intrusion experiment: Mercury is not wet to genera...
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The invention provides a method for characterizing the occurrence state of water in shale by using frozen high-pressure mercury injection. The method mainly comprises the following steps: S1, cuttingn groups of parallel samples; S2, respectively drying the n groups of parallel samples; S3, respectively setting a standard pretreatment condition and n-1 groups of different humidity balance pretreatment conditions, and respectively pretreating the parallel samples; S4, after the pretreatment is finished, respectively performing liquid nitrogen quick-freezing and heating refrigeration treatment on the n-1 groups of parallel samples in sequence; S5, obtaining the porosity of the parallel sample and a pore throat diameter-mercury injection amount distribution curve; and S6, performing difference processing on the pore throat diameter-mercury injection amount curve of the parallel sample subjected to humidity balance pretreatment and the pore throat diameter-mercury injection amount curve ofthe parallel sample subjected to standard pretreatment to obtain a pore throat diameter-occurrence water volume curve, wherein the pore throat diameter-occurrence water volume curve represents occurrence space distribution of water in the parallel sample.
Description
technical field [0001] The invention relates to the technical field of unconventional oil and gas experiments, in particular to a method for characterizing the occurrence state of water in shale by using a freezing method and high-pressure mercury injection. Background technique [0002] Over the past few decades, shale gas has become an important part of global energy. However, many problems have been encountered in the production of shale gas. At present, the overall recovery rate of oil shale gas wells is very low. [0003] In the prior art, shale gas exploitation is carried out by staged fracturing of horizontal wells, and hydraulic fracturing requires pumping a large amount of fracturing fluid into the formation. After shale fracturing, low flowback causes a large amount of fracturing fluid to remain in the reservoir. The study on the occurrence state of fracturing fluid and its interaction mechanism with shale has important guiding significance for the efficient and s...
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IPC IPC(8): G01N15/08G01N5/00
CPCG01N5/00G01N15/0886
Inventor赵翔孙梦迪王小明郑爱维王超
OwnerCHINA UNIV OF GEOSCIENCES (WUHAN)