Irregular shale sample and preparation method thereof as well as ultrasonic testing device

A technology of rules and samples, which is applied in the preparation of test samples and the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, etc., can solve the problems of high cost and difficulty, and difficulty in obtaining regular samples, and achieve fast rock testing and convenient acquisition. Effect

Inactive Publication Date: 2015-02-25
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

At present, the wave velocity measurement of rocks is usually obtained by measuring large-sized regular cores in the laboratory, but it is not easy to obtain regular samples, especially for shale with fractures, joint development and strong water sensitivity. Cores are expensive and difficult

Method used

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  • Irregular shale sample and preparation method thereof as well as ultrasonic testing device
  • Irregular shale sample and preparation method thereof as well as ultrasonic testing device
  • Irregular shale sample and preparation method thereof as well as ultrasonic testing device

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preparation example Construction

[0027] figure 2 A schematic flow chart of the irregular shale sample preparation method provided in Example 2 of the present invention, the irregular shale sample preparation method is used to prepare the irregular shale sample as described in Example 1, such as figure 2 As shown, the method includes:

[0028] 201. Put some irregular rock cores into a cylindrical container;

[0029] 202. Add a mixed solution into the cylindrical container, the mixed solution includes an epoxy resin and a curing agent, so that after the mixed solution is solidified, a disc-shaped shale sample is formed;

[0030] 203. Grinding the end faces of the shale samples to expose the two end faces of each irregular core.

[0031] Specifically, in practical applications, at least one irregular core can be selected, for example, it can be an irregular shale core. Mix epoxy resin and curing agent in a certain proportion to form a mixed solution, stir evenly and set aside. The container can be a paper ...

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Abstract

The invention provides an irregular shale sample and a preparation method thereof as well as an ultrasonic testing device. The preparation method comprises the steps of mixing epoxy resin and a curing agent according to a certain proportion and evenly stirring for later use; adding a plurality of irregular shale samples into a cylindrical container, pouring the prepared resin solution into the container, and forming a round cake-shaped sample after the resin solution is solidified; smoothing the two ends of the round cake-shaped sample by polishing so that the two end surfaces of each irregular shale sample are exposed; respectively fixing two needle type probes at the exposed two ends of each irregular shale sample by a special clamp holder; using a sound wave pulse method to obtain the ultrasonic wave forms in cores of the shale samples; adopting an autocorrelation method to obtain high-precision elastic wave velocity. The needle type probes and the autocorrelation method are adopted by the method, so that the monitoring accuracy of the elastic wave velocity is greatly improved, the elastic property of the shale can be rapidly obtained, and the problem that regular shale samples are not enough can be solved; furthermore, the method is simple to operate and suitable for evaluating the elastic property of the underground cores in real time in the oil field.

Description

technical field [0001] The invention relates to the field of ultrasonic testing of rocks, in particular to an irregular shale sample, a preparation method and an ultrasonic testing device. Background technique [0002] The wave velocity of the rock contains rich information on the internal structure of the rock, and is the basic data for wellbore stability analysis, hydraulic fracturing design, bit selection and drilling parameter optimization. At present, the wave velocity measurement of rocks is usually obtained by measuring large-sized regular cores in the laboratory, but it is not easy to obtain regular samples, especially for shale with fractures, joint development and strong water sensitivity. Cores are expensive and difficult. [0003] Therefore, how to conveniently obtain shale samples for rock mechanics testing has become an urgent technical problem to be solved. Contents of the invention [0004] The invention provides an irregular shale sample, a preparation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N29/07
Inventor 王小琼葛洪魁索彧汪道兵王剑波陈浩孟范宝
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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