Coolant capable of inhibiting anchor rod drill hole collapse in red sandstone zone

Abstract

The invention discloses a coolant capable of inhibiting anchor rod drill hole collapse in a red sandstone zone. The formulation of the coolant is as follows: the concentrations of all materials in an aqueous solution are that the concentration of calcium ions is 0-0.8 mol / L, the volume fraction of ethyl alcohol is 8-10 percent, and the pH value is 10-14. The coolant capable of inhibiting anchor rod drill hole collapse in the red sandstone zone has a better inhibition effect on red sandstone collapse and is low in cost.

Description

technical field [0001] The invention relates to a cooling liquid, in particular to a cooling liquid capable of inhibiting the disintegration of bolt holes in red sandstone areas. Background technique [0002] The so-called "red sandstone" mainly refers to the continental red rock series from the Jurassic to the Neogene, and its lithology is mudstone, sandstone, argillaceous sandstone, sandy mudstone, siltstone, etc. ". Under natural conditions, the uniaxial compressive strength of red sandstone is low, and it is a soft rock. Because most of them are cemented with mud, they are easy to soften and disintegrate when exposed to water. Studies have shown that its disintegration mechanism is as follows: the structural unit layers of clay minerals in red sandstone, especially montmorillonite, are connected by oxygen-oxygen bonds, and the bond force is extremely weak. Molecules can easily wedge themselves into it, causing them to separate. At the same time, the trivalent aluminu...

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Problems solved by technology

[0006] Due to Ca(OH) 2 low solubility, CaCl 2 The solution is slightly less effective

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