An experimental analysis method for the study of compressibility of shale samples

An experimental analysis and sample technology, applied in the direction of analyzing materials, using stable tension/pressure to test material strength, strength characteristics, etc., can solve problems that need to be deepened and have not been clarified, whether cracks are formed inside brittle minerals, etc.

Active Publication Date: 2021-11-30
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, from another perspective, there are few reports on the mineral composition of shale and fracture formation after fracturing. The formation and distribution of shale fractures after fracturing, especially the The relationship between brittle minerals (quartz, etc.) has not been clarified. Are cracks formed inside brittle minerals? Or is it easy to form between brittle mineral particles? Or does it develop at the edges of brittle mineral grains? These studies on the mechanism of shale fracture formation need to be deepened in order to better guide the evaluation of shale compressibility and the practice of shale gas development

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  • An experimental analysis method for the study of compressibility of shale samples

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawing.

[0028] Such as figure 1 As shown, it includes a cylindrical autoclave and an autoclave top cover arranged at the opening of the autoclave. The center of the top cover is provided with a through hole for passing the high-pressure pipeline. The high-pressure pipeline can lead into the autoclave cavity. One end of the high-pressure pipeline is provided with a pressure sensor and a fluid booster pumping device. An annular sealing ring is arranged at the through hole of the top cover of the autoclave.

[0029] During the experiment, the shale sample was first processed into a cylindrical plunger 4, and a hole 5 was drilled axially at the center of the plunger 4, and the drilled plunger 4 was placed in a In the sleeve 3 of plunger equal length. The outer edge of the sleeve 3 with the built-in shale sample plunger 4 is coated with a little silicone grease, and then placed in th...

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Abstract

An experimental analysis method for studying the compressibility of a shale sample, comprising the following steps: processing the shale sample into a cylindrical plunger, and drilling a hole axially along the axis of the plunger; The plunger sample is placed in the sleeve; the outer edge of the sleeve with the built-in shale plunger sample is coated with silicone grease and put into the autoclave; the fluid is pumped into the autoclave, and the autoclave is heated at the same time and detected by the pressure sensor Pumping pressure; after the shale sample is broken, adjust the temperature of the autoclave until the fluid solidifies, and keep it for a time t1; cut and grind the formed fractured specimen into thin slices, and analyze and observe the fracture morphology characteristics. The present invention simulates the fracturing of shale fluid and maintains the original state after fracturing. With the help of technical means such as microscope, scanning electron microscope and energy spectrum analysis, the shape, direction, quantity and mechanism of fracturing of fluid fracturing are analyzed. Conduct observation and statistical analysis to provide theoretical guidance for shale sample frackability evaluation and fracturing practice.

Description

technical field [0001] The invention is an experimental device and method for evaluating the compressibility of shale applied in the field of geology, in particular an experimental device and method for evaluating the compressibility of mud shale. Background technique [0002] Fracturing is a necessary technical means to obtain high-yield gas flow in shale formations, and the fracability evaluation of shale is an important part of shale gas evaluation research. The frackability of shale refers to the property that shale reservoirs can be effectively fractured to increase production. Shale with different frackability forms different fracture networks during hydraulic fracturing. In order to evaluate the compressibility of shale, many scholars have carried out a lot of research work from different angles. [0003] Some analyze and study the avalanche fragments of shale samples through uniaxial strength experiments, and take the arithmetic average of the brittleness index, str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0019G01N2203/0048G01N2203/0062G01N2203/0067
Inventor 鲍云杰鲍芳李志明蒋启贵黎茂稳钱门辉
Owner CHINA PETROLEUM & CHEM CORP
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