Micrometer CT rock core pretreatment method and device

Abstract

An embodiment of the invention provides a micrometer CT rock core pretreatment method and device. The method includes the steps: placing a rock core sample into a metal straight pipe, and enabling thelower end of the rock core sample to extend out of the lower end of the metal straight pipe; taking the lower end surface of the metal straight pipe as a tangent plane, and cutting off the lower endof the rock core sample extending out of the metal straight pipe, placing a carbon rod with the diameter as same as that of the rock core sample into a storage cylinder, and enabling the upper end ofthe carbon rod to extend out of the upper end of the storage cylinder; taking out the rock core sample from the metal straight pipe, and bonding the lower end of the rock core sample and the upper endof the carbon rod in an aligned manner; moving the storage cylinder upwards, and enabling the carbon rod and the rock core sample to be placed into the storage cylinder; standing for set time, and moving the storage cylinder downwards to take out a bonding body of the carbon rod and the rock core sample. The outer diameter of the metal straight pipe is matched with the diameter of the rock core sample, the lower end surface of the metal straight pipe is a horizontal plane, the storage cylinder can vertically move relative to the carbon rod, and the upper end surface of the carbon rod is a horizontal plane. The pretreatment method can ensure that a prepared sample is vertical and is convenient to operate and easy to implement.

Description

technical field [0001] The present application relates to the technical field of micro-CT core analysis, in particular to a micro-CT core pretreatment method and equipment. Background technique [0002] The micro-CT core analysis technology has developed into a very important technical means in the field of core analysis technology, which can be used in the research of core pores and fractures characterization, three-dimensional pore connectivity characterization, etc. At present, the maximum resolution of micro-CT can be several microns, and the core samples used for micro-CT observation are core samples with a diameter of several millimeters. Before the core observation, it is necessary to paste the core sample on the carbon rod with glue, and ensure that the core sample is vertical; The distance between the ray source is inconsistent, which increases the distance between the core sample and the ray source; according to the principle of X-ray optical imaging, the increase...

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Problems solved by technology

However, there are many problems in this method in actual operation: (1) when the bottom of the core sample is polished by sandpaper, there is a lot of subjective operability, and it is extremely difficult to judge the complete level of a core sample of several mm only by artificial eyes. (2) The core sample is very small, so you need to be careful when placing the core sample on the carbon rod, and a little shaking may cause the core sample to be damaged. If there is a large angle of tilt or drop, it often needs to be glued again; (3) The solidification process of the core sample and the carbon rod may take several hours, and the shaking of the tabletop and the blowing of the wind may cause the core to tilt

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