Retarding cement slurry composite for replacement of super-deep freezing hole and preparation method thereof

Abstract

The invention discloses a retarding cement slurry composite for replacement of super-deep freezing hole and a preparation method thereof. The composite consists of silicate cement, retarder, a stabilizing agent and water; and retarding silicate cement slurry is prepared according to the mass ratio of 1:0.7-1:1.5 parts of water and cement, wherein the added retarding agent accounts for 0.1-0.3 parts of the cement; and the added stabilizing agent accounts for 0-10 parts of the cement. The retarding agent is JS-1 type retarding agent and consists of hydroxy carboxylic acid as well as salt thereof and inorganic salt, wherein the hydroxy carboxylic acid and salt thereof accounts for 50-70 parts and the inorganic salt counts for 30-50 parts. The preparation method comprises the following steps of: weighing water, and pouring the water into a stirring box; weighing the retarding reagent and stirring; weighing the bentonite and continuously stirring; and weighing the cement and continuously evenly stirring. The invention has the comprehensive advantages of long retarding time, good replaceability and high concretion intensity, and can be widely applied to industries, such as coal mine, petroleum and the like.

Description

technical field [0001] The invention relates to a slow-setting cement slurry composition, in particular to a slow-setting cement slurry composition for replacing ultra-deep frozen holes. Background technique [0002] The freezing method is to use artificial refrigeration to freeze the strata around the wellbore into a closed cylindrical frozen wall before the wellbore is excavated to resist ground pressure and isolate the connection between groundwater and the wellbore, and then excavate under the protection of the frozen wall. A special construction method for masonry work. [0003] In recent years, with the development of deep coal and various ore bodies, the shaft depth has been increasing. In order to ensure the safe and smooth construction of the wellbore, the method of freezing the topsoil section and grouting the bedrock section is often used for construction. This method requires two sets of processes of freezing and grouting, with long construction period, high in...

AI Technical Summary

Problems solved by technology

When using the method of one-time freezing and full-depth construction, since the frozen pipe needs to pass through the Matoumen and other chambers at the bottom of the shaft, after the shaft bottoms out, the frozen wall will naturally thaw, and a large amount of water and mud and sand may flow in through the annular space between the frozen pipe and the surrounding rock. The bottom of the well may cause water inrush and flooding accidents in severe cases

For example, in Yangzhuang Coal Mine in Yanzhou, Shandong Province, a well flooding accident occurred due to a large amount of water gushing into the bottom of the well through the annular space between the frozen pipe and the surrounding rock, which not only caused serious economic losses, but also extended the construction period of the well.

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