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Underground coal mine while drilling collapse prevention flushing fluid and preparation method thereof

A flushing fluid and anti-collapse technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of easy collapse of the hole wall, limited slag discharge capacity of flushing fluid, etc. The effect of degradation function

Inactive Publication Date: 2018-07-13
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of limited slagging ability of conventional flushing fluid and easy collapse of the hole wall during the drilling process of underground gas drainage in coal mines, the present invention aims at the technical defects existing in the application process of existing flushing fluids, and provides an anti-collapse while drilling in coal mines Type flushing liquid and its preparation method, in order to achieve the purpose of strong ability to carry coal slag and good anti-collapse function

Method used

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  • Underground coal mine while drilling collapse prevention flushing fluid and preparation method thereof
  • Underground coal mine while drilling collapse prevention flushing fluid and preparation method thereof
  • Underground coal mine while drilling collapse prevention flushing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation approach 1

[0025] Indoor experiment of anti-slump flushing fluid while drilling: Add 1.5g of main viscosity-increasing agent, 2.0g of auxiliary viscosity-increasing agent, and 2.5g of flocculant in 500ml of clean water, stir thoroughly for 0.5 hours, and let stand for 12 hours to obtain anti-slump while drilling Type rinse fluid base fluid. Add 20g of bentonite to the base liquid and stir evenly to obtain the anti-collapse flushing liquid while drilling.

preparation approach 2

[0027] Indoor experiment of anti-slump flushing fluid while drilling: add 1.0g of main viscosity-increasing agent, 1.5g of auxiliary viscosity-increasing agent, and 2.0g of flocculant in 500ml of clean water, stir thoroughly for 0.5 hours, and let stand for 12 hours to obtain anti-slump while drilling Type rinse fluid base fluid. Add 25g of bentonite to the base liquid and stir evenly to obtain the anti-collapse flushing liquid while drilling.

preparation approach 3

[0029] Indoor experiment of anti-slump flushing fluid while drilling: Add 2.0g of main viscosity-increasing agent, 2.0g of auxiliary viscosity-increasing agent, and 1.0g of flocculant in 500ml of clean water, stir thoroughly for 0.5 hours, and let stand for 12 hours to obtain anti-slump while drilling Type rinse fluid base fluid. Add 25g of bentonite to the base liquid and stir evenly to obtain the anti-collapse flushing liquid while drilling.

[0030] On the basis of completing three different preparation schemes, various basic performance tests and decomposition performance tests were carried out on the prepared anti-collapse flushing fluid while drilling. The fully preferred formulation is, in terms of mass fraction: 4% bentonite + 0.3% carboxymethyl cellulose sodium salt + 0.4% Tianqing gum + 0.5% nonionic polyacrylamide.

[0031] (1) Basic performance test: mainly includes performance tests such as density, rheology (including apparent viscosity, plastic viscosity, dynam...

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Abstract

The invention discloses underground coal mine while drilling collapse prevention flushing fluid and a preparation method thereof, and is mainly applied to the underground coal mine drilling construction process. The while drilling collapse prevention flushing fluid adopts a formula that 3 to 4kg of a thickening main agent, 4 to 5kg of an auxiliary thickening agent, 4 to 5kg of a flocculant, 3 to 5gk of biological enzyme, and 40 to 50kg of bentonite are added into each cubic meter of water. The underground coal mine while drilling collapse prevention flushing fluid is simple in preparation method and excellent in effect, has excellent rheological property, collapse prevention wall building property and degradability, and meanwhile has high shear force and coal slag carrying capacity.

Description

technical field [0001] The invention relates to the technical field of drilling flushing fluid for underground coal mines, in particular to an anti-collapse flushing fluid while drilling for underground coal mines and a preparation method thereof. Background technique [0002] During the drilling construction process, in order to speed up the drilling progress, the drilling flushing fluid is often used to effectively remove the slag. Due to the impact of mining, there will be local stress concentration around the borehole, and the mechanical properties of the coal will also change significantly under the influence of the flushing fluid. The instability of the borehole wall is a difficult problem often encountered in the drilling process. Instability of the hole wall will lead to collapse, radial shrinkage and sticking, loss of drilling fluid, and ultimately lead to the scrapping of the borehole. Analyzing the factors of borehole instability and collapse, it can be found tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528C09K8/508C09K8/514
CPCC09K8/5083C09K8/514C09K8/528C09K2208/02C09K2208/18
Inventor 王凯黄艳涛刘昂杜锋周爱桃
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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