Cement composition and application thereof

A cement composition and composition technology, applied in the direction of drilling composition, coal gasification, chemical instruments and methods, etc., can solve the problems of poor high temperature resistance, easy cracking or falling off, etc., and achieve excellent high temperature resistance Effect

Active Publication Date: 2012-07-04
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0043] The purpose of the present invention is to overcome the poor high temperature resistance of the cement stone rings of the air inlet passage and the air outlet passage in the existing underground coal gasification furnace, and are prone to cracking or falling off at high temperatures (such as temperatures above 380°C) defects, providing a cement composition with excellent high temperature resistance and its application

Method used

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  • Cement composition and application thereof
  • Cement composition and application thereof
  • Cement composition and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] This example is used to illustrate the cement composition of the present invention and its application.

[0072] (1) Preparation of cement slurry

[0073] The particle diameter of 15 parts by weight is about 150 mesh quartz sand (SiO 2 The content is about 96% by weight), the particle diameter of 15 parts by weight is about 200 mesh quartz sand (SiO 2 content is about 98% by weight), 20 parts by weight of fly ash and 2 parts by weight of water glass are mixed. Then, the obtained mixture was mixed with 100 parts by weight of G-grade oil well cement (purchased from Shandong Huayin Special Cement Co., Ltd.) and 55 parts by weight of water to obtain cement slurry A3. The density of the cement slurry A3 measured by the specific gravity method is 1.75g / cm 3 .

[0074] (2) Preparation of coal underground gasifier

[0075] Two wells with diameters of 311 mm and 215.9 mm were drilled in the formation all the way to the coal seam, the distance between the axes of the two wel...

Embodiment 2

[0077] This example is used to illustrate the cement composition of the present invention and its application.

[0078] (1) Preparation of cement slurry

[0079] The particle diameter of 8 parts by weight is about 120 mesh quartz sand (SiO 2 Content is about 96% by weight), the particle diameter of 12 parts by weight is about 180 mesh quartz sand (SiO 2 The content is about 98% by weight), 25 parts by weight of floating beads (purchased from Hebei Xingtai Hongtai Floating Bead Factory) and 2 parts by weight of calcium chloride. Then, the obtained mixture was mixed with 100 parts by weight of G-grade oil well cement (purchased from Shandong Huayin Special Cement Co., Ltd.) and 60 parts by weight of water to obtain cement slurry A2. The density of the cement slurry A3 measured by the specific gravity method is 1.60g / cm 3 .

[0080] (2) Preparation of coal underground gasifier

[0081] An underground coal gasifier was prepared according to the method of Example 1, except tha...

Embodiment 3

[0083] This example is used to illustrate the cement composition of the present invention and its application.

[0084] (1) Preparation of cement slurry

[0085] The particle diameter of 22 parts by weight is about 160 mesh quartz sand (SiO 2 Content is about 96% by weight), the particle diameter of 18 parts by weight is about 220 mesh quartz sand (SiO 2 content is about 98% by weight), 15 parts by weight of expanded perlite (purchased from Pingqiao Xinyuan Thermal Insulation Material Factory) and 2 parts by weight of water glass are mixed. Then, the obtained mixture was mixed with 100 parts by weight of G-grade oil well cement (purchased from Shandong Huayin Special Cement Co., Ltd.) and 50 parts by weight of water to obtain cement slurry A3. The density of the cement slurry A3 measured by the specific gravity method is 1.80g / cm 3 .

[0086] (2) Preparation of coal underground gasifier

[0087] The underground coal gasification furnace was prepared according to the metho...

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Abstract

The invention relates to a cement composition, which comprises oil well cement, a heat stabilizer and a lightening agent. Taking the amount of the oil well cement as 100 weight portions, the content of the heat stabilizer is 10-50 weight portions, and the content of the lightening agent is 10-30 weight portions. Based on the total weight of the heat stabilizer, the heat stabilizer comprises 40-60 percent of 100-160-mesh quartz sand by weight and 40-60 percent of 180-250-mesh quartz sand by weight. The invention also relates to an application of the composition in production of an underground coal gasification furnace. The cement stone prepared with the cement composition has good resistance against high temperature. Moreover, the underground coal gasification furnace produced with the cement composition has long service life.

Description

technical field [0001] The invention relates to a cement composition and the application of the cement slurry composition in manufacturing an underground coal gasification furnace. Background technique [0002] Coal accounts for more than 65% of the total primary energy consumption in my country, and it is the largest coal producer and consumer in the world. China has proven recoverable coal reserves of about 190 billion tons, but the total reserves are estimated to be as high as 4 trillion tons. If we step up efforts to find out the resources and use advanced technology to rationalize the development, it is expected to maintain the supply for one hundred or even hundreds of years. [0003] Traditional coal mining involves a series of environmental and health issues, such as: ground subsidence, miners' health and safety, desulfurization, dust pollution, waste (water) discharge, etc. [0004] In order to make full and reasonable use of precious coal resources and maintain su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467E21B43/295
Inventor 孙雨陈隆郝立强李华韩源包军
Owner CHINA SHENHUA ENERGY CO LTD
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