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Low-temperature-resistant modified cement and preparation method thereof

A low temperature resistant and modified technology, applied in the field of cement, can solve the problems of high raw material composition, unfavorable promotion and use, etc., and achieve the effects of easy construction operation, high compressive strength, and a wide range of sources.

Active Publication Date: 2021-05-04
河北承大环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high raw material composition used in this type of cement material is not conducive to the actual promotion and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A low-temperature-resistant modified cement, which is composed of the following raw materials in parts by weight:

[0025] 220 parts of Portland cement, 45 parts of fly ash, 20 parts of diatomite, 18 parts of bentonite, 30 parts of gypsum powder, 40 parts of calcium fluoride mineral powder, 7 parts of early strength agent. Among them, the early strength agent is composed of lithium chloride, ethylene glycol, ethanolamine and melamine-based water reducer in a mass ratio of 5:1:2:0.3.

[0026] The preparation method of the low-temperature-resistant modified cement is specifically:

[0027] The raw materials are weighed in proportion, and the raw materials are mechanically stirred and mixed; then the mixed raw materials are mechanically ground; finally, the ground raw materials are passed through a 60-mesh sieve to obtain the modified cement.

Embodiment 2

[0029] A low-temperature-resistant modified cement, which is composed of the following raw materials in parts by weight:

[0030] 300 parts of Portland cement, 50 parts of fly ash, 20 parts of diatomite, 20 parts of bentonite, 30 parts of gypsum powder, 40 parts of calcium fluoride mineral powder, 10 parts of early strength agent. Among them, the early strength agent is composed of lithium chloride, ethylene glycol, ethanolamine and melamine-based water reducer in a mass ratio of 5:1:2:0.3.

[0031] The preparation method of the low-temperature-resistant modified cement is specifically:

[0032] The raw materials are weighed in proportion, and the raw materials are mechanically stirred and mixed; then the mixed raw materials are mechanically ground; finally, the ground raw materials are passed through a 60-mesh sieve to obtain the modified cement.

Embodiment 3

[0034] A low-temperature-resistant modified cement, which is composed of the following raw materials in parts by weight:

[0035] 150 parts of Portland cement, 50 parts of fly ash, 20 parts of diatomite, 20 parts of bentonite, 30 parts of gypsum powder, 40 parts of calcium fluoride mineral powder, 5 parts of early strength agent. Among them, the early strength agent is composed of lithium chloride, ethylene glycol, ethanolamine and melamine-based water reducer in a mass ratio of 5:1:2:0.3.

[0036] The preparation method of the low-temperature-resistant modified cement is specifically:

[0037] The raw materials are weighed in proportion, and the raw materials are mechanically stirred and mixed; then the mixed raw materials are mechanically ground; finally, the ground raw materials are passed through a 60-mesh sieve to obtain the modified cement.

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PUM

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Abstract

The invention provides low-temperature-resistant modified cement and a preparation method thereof. The modified cement is prepared from the following raw materials in parts by weight: 150 to 300 parts of Portland cement, 30 to 80 parts of fly ash, 20 to 30 parts of diatomite, 10 to 40 parts of bentonite, 15 to 40 parts of gypsum powder, 20 to 50 parts of calcium fluoride mineral powder and 5 to 10 parts of an early strength agent. The raw materials adopted by the invention are low in cost, so that the cement has relatively long thickening time at low temperature, the construction requirement is met, and meanwhile, the cement strength at low temperature is high.

Description

technical field [0001] The invention relates to the technical field of cement, in particular to a low-temperature-resistant modified cement and a preparation method thereof. Background technique [0002] During the cementing process in deep water, there are often low temperature, potential shallow water channeling and gas channeling, narrow "window" between formation pore pressure and fracture force, easy formation leakage, prediction of cementing temperature, poor displacement, etc. Under the low temperature encountered in deep water cementing, the hydration rate of commonly used oil well cement is greatly inhibited. Therefore, improving the performance of cement under low temperature conditions in deep water and promoting the rapid development of the compressive strength of cement slurry is an urgent need in the industry. solved problem. [0003] In the Chinese patent CN201910424139.1, a cementing material suitable for low temperature environment and its production method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B111/76
CPCC04B28/14C04B2201/50C04B2111/76C04B7/02C04B18/08C04B14/08C04B14/104C04B22/126C04B22/124C04B24/02C04B24/122C04B2103/302
Inventor 关长浩
Owner 河北承大环保科技有限公司
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