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Method for making cement sample for simulating pore characteristics of original rock

A production method and cement technology, applied in the preparation of test samples, etc., can solve the problems of large gaps in pore structure, reduce the efficiency and accuracy of physical simulation experiments, and achieve the effect of reducing test costs

Inactive Publication Date: 2018-11-16
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0003] At present, in the process of simulating the pore structure of rocks, the method of prefabricating hard paper sheets in cement samples is widely used in China. This method is quite different from the pore structure of the original rock, which greatly reduces the efficiency and efficiency of physical simulation experiments. accuracy

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  • Method for making cement sample for simulating pore characteristics of original rock
  • Method for making cement sample for simulating pore characteristics of original rock

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Embodiment Construction

[0021] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] refer to figure 1 , in this preferred embodiment, a kind of preparation method of the cement sample that is used to simulate the pore characteristic of original rock, comprises the following steps:

[0023] Step S10, testing the mechanical strength and pore characteristics of the original rock in the target block, and selecting the ratio of water, ash and sand in the raw materials of the cement sample 20 according to the mechanical strength test results, mixing the raw materials and uniformly stirring to form a mixture;

[0024] The original rock is subjected to compressive and flexural strength tests, and the mechanical strength test results are obtained. Based on the mechanical strength test results, a number of small samples with different ratios of water, ash, and sand are made, and several small samples ar...

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Abstract

A disclosed manufacture method for a cement sample used for simulating parent-rock porosity character comprises the following steps: measuring the mechanical strength and the porosity character of a target-area parent rock, selecting the ratio of water, lime and sand in the cement sample raw materials according to the mechanical strength measurement result, mixing the raw materials, and uniformly stirring to form a mixture; adding the mixture into a sample mold in batches, taking the parent-rock porosity character measurement result as a basis, and adding a modified polyvinyl alcohol slice into each batch of the mixture according to the measured pore position, size and direction in the parent rock; after the cement sample is solidified, demolding, and maintaining at a preset condition, so as to obtain the cement sample. By employing the provided manufacture method for the cement sample used for simulating parent-rock porosity character, the manufactured cement sample can relatively well simulate the bedding and natural crack cases of rock, and the efficiency and the accuracy of physical simulation experiments for hydraulic fracturing, oil-gas exploitation and reservoir damage and recovery evaluation are improved.

Description

technical field [0001] The invention relates to the technical field of cement sample preparation methods, in particular to a cement sample preparation method for simulating the pore characteristics of original rock. Background technique [0002] As a low-porosity and low-permeability sedimentary rock, shale has thin-sheet bedding and complex natural fracture systems. Since the study of the mechanism of hydraulic fracturing requires a large number of experiments, it is impossible to conduct all of them based on the original rock. Therefore, the development of cement samples with similar physical and mechanical properties to the original rock is the basis for the physical simulation of hydraulic fracturing. In addition, it is also necessary to produce a large number of cement samples in the process of simulating oil and gas exploitation indoors and evaluating reservoir damage and restoration. [0003] At present, in the process of simulating the pore structure of rocks, the m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 刘天乐解经宇王荣璟蒋国盛彭力
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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