Long-term preservation method for well core

Abstract

The invention relates to a long-term preservation method for a well core, which mainly solves the problem of difficult preservation because a fractured and broken core taken out of a shaft bottom is difficult to cut or difficultly forms the entire plane after being cut. The method is characterized by comprising the following steps of: preparing a casting material; putting the core to be preserved into a U-shaped polyethylene support groove; slowly pouring the casting material into the U-shaped polyethylene support groove filled with the core; and sizing gel at room temperature, cutting the core after solidifying and sizing in a thermostatic drying oven, putting the core into a U-shaped transparent organic glass support groove for secondary casting and smoothing, grinding and polishing the surface of crystal gel in the U-shaped transparent organic glass support groove until the crystal gel is bright and transparent. By the method, the core can be integrally cut, a cut plane is smooth, the original core is preserved permanently and cannot be broken and the core is convenient to observe in all dimensions.

Description

technical field [0001] The invention relates to a method for preserving rock cores in the field of geological drilling and coring, in particular to a long-term preservation method for drilling rock cores. Background technique [0002] In the existing field of geological drilling and coring, after the core is taken out from the bottom of the well and decompressed on the ground, the core is easily broken and disintegrated, and after disintegration, it becomes a massive core with uneven shapes and sizes. At present, it is difficult for the commonly used cutting machine to cut the core longitudinally from the middle position, or it is difficult to form a whole plane after cutting. There are generally two methods for the preservation of this type of core: one is natural storage. The core taken out from the bottom of the well is placed in an open plastic box without any sealing measures, and is exposed to air with temperature and humidity changes for a long time, which increases t...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the problem in the background art that the fractured and disintegrated rock cores taken out from the bottom of the well are difficult to cut or difficult to form an integral plane after cutting, resulting in difficulty in preservation, and provide a long-term preservation method for drilling cores, which can be used for The overall cutting of the core, the cutting plane is smooth, the original core is permanently preserved, not broken, and it is convenient to observe the core in all directions

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