Manufacturing method of shale cylindrical sample

Abstract

The invention provides a manufacturing method of a shale cylindrical sample. The manufacturing method comprises the following steps: step 1, wrapping a shale sample with a plastic film; step 2, mixinggypsum powder with water to make a lacteal product; step 3, putting the shale sample wrapped by the plastic into the lacteal gypsum slurry; step 4, after solidification of the gypsum slurry, seamlessly integrating the gypsum slurry and the shale sample into a whole; step 5, performing cylindrical drilling on the shale in the absence of water; and step 6, taking out the cylindrical sample. According to the method, because cylindrical sample drilling in water and concrete pouring outside original sample are not required, the success rate of preparation of the shale cylindrical sample is greatlyimproved and the rock sample is prevented from being polluted, thereby laying the solid foundation for the effective analysis of subsequent shale rock physical property parameters (such as porosity and permeability). In addition, the method has the advantages of short preparation period, simple operation and the like.

Description

technical field [0001] The invention belongs to the field of petroleum geology, and in particular relates to a method for preparing a shale cylinder sample. Background technique [0002] Shale cylindrical samples are an important basis and prerequisite for determining petrophysical parameters (such as porosity and permeability) in shale, but because shale is easily broken, it is very difficult to successfully drill cylindrical samples in shale, which affects the Accurate detection of shale physical parameters. [0003] At present, the drilling of rock cylinder samples is carried out according to the conventional rock cylinder drilling instrument in the presence of water. Since the shale bedding is relatively developed and easy to break, it is more likely to break due to water absorption and swelling when it encounters water. This method is more difficult for shale drilling. Search related technologies through the State Intellectual Property Office. The search formula is "s...

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Problems solved by technology

[0002] Shale cylindrical samples are an important basis and prerequisite for determining petrophysical parameters (such as porosity and permeability) in shale, but because shale is easily broken, it is very difficult to successfully drill cylindrical samples in shale, which affects the Accurate detection of shale physical parameters

[0003] At present, the drilling of rock cylinder samples is carried out according to the conventional rock cylinder drilling instrument in the presence of water. Since the shale bedding is relatively developed and easy to break, it is more likely to break due to water absorption and swelling when it encounters water. The method is more difficult for shale drilling

Search related technologies through the State Intellectual Property Office. The search formula is "shale cylinder" and "cylinder", and no relevant patents are found. The search formula is "shale, experimental sample", and 2 patents are retrieved: one CN104330310A, an oil shale hydraulic fracturing simulation experimental system and a method for making experimental samples, this patent focuses on the invention of hydraulic pressure simulation experiments; another patent CN105973667A, a method for preparing shale hydraulic fracturing experimental samples, After comparative research, the patent and its method have certain similarities with the present invention, and the purpose is to obtain columnar samples, but the method of pouring concrete outside the original state is cumbersome and pollutes the rock samples

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