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Oil well cement additive used for preventing H2S/CO2 co-corrosion, and preparation method and application thereof

A technology of oil well cement and admixture, which is applied in the field of petroleum exploration, can solve problems such as corrosion, and achieve the effect of improving compressive strength and gas permeability

Active Publication Date: 2013-05-01
CHINA PETROLEUM & CHEM CORP +1
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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 not being able to resist H at the same time in the prior art 2 S, CO 2 The problem of common corrosion, the present invention is aimed at the H contained in the Sichuan marine gas reservoir 2 S, CO 2 Common corrosive gases, in carrying out CO 2 、H 2 Based on the research on the corrosion mechanism of the cement sheath under the co-corrosion environment of S, a kind of anti-H 2 S / CO 2 Co-corroded oil well cement admixture and its preparation method and application
The purpose is to solve the CO2 resistance of the existing cementing slurry 2 、H 2 Corrosion problems in S coexistence environment

Method used

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  • Oil well cement additive used for preventing H2S/CO2 co-corrosion, and preparation method and application thereof
  • Oil well cement additive used for preventing H2S/CO2 co-corrosion, and preparation method and application thereof
  • Oil well cement additive used for preventing H2S/CO2 co-corrosion, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] 100 parts by weight of fly ash and 35 parts of slag are ground in a dry ball mill and mixed evenly to a fineness of 500 meshes, and then put into a double-screw mixer. Add 12 parts of microsilica fume, 35 parts of superfine alumina, 12 parts of organic material pitch and 7 parts of sodium methyl siliconate for mixing, repeat mixing for 2 hours, and obtain product powder 1# after being uniform.

Embodiment 2

[0058] 100 parts of fly ash, 25 parts of slag, ground in a dry-type ball mill and mixed evenly to reach a fineness of 500 meshes, then put into a double-screw mixer, add 27 parts of micro-silica fume, 12 parts of ultra-fine alumina Parts, 27 parts of organic material asphalt and 9 parts of sodium methyl siliconate were mixed and mixed repeatedly for 2 hours, and the product powder 2# was obtained after being uniform.

Embodiment 3

[0060] Take 100 parts of fly ash and 30 parts of slag, grind them in a dry ball mill and mix them evenly to reach a fineness of 500 meshes, then put them into a double-screw mixer, add 25 parts of microsilica fume, superfine alumina 30 parts, 25 parts of organic material asphalt, and 8 parts of sodium methyl siliconate were mixed and mixed repeatedly for 2 hours, and the product powder 3# was obtained after being uniform.

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Abstract

The invention discloses an oil well cement additive used for preventing H2S / CO2 co-corrosion, and a preparation method and an application thereof. The oil well cement additive comprises 100 parts of fly ash, 20-40 parts of slag, 6-10 parts of sodium methylsiliconate, 10-30 parts of organic material asphalt, 10-30 parts of micro silica powder, and 10-40 parts of ultrafine alumina. Calculated according to the weight of cement as 100 parts, 30-65 parts of the oil well cement additive used for preventing H2S / CO2 co-corrosion is added. With the additive, cement stone compactness is improved. Cement stone gas permeability is low, and hydrogen sulfide and carbon dioxide co-corrosion resistance is high. The additive can be applied in different temperatures, and an application range is wide.

Description

technical field [0001] The present invention relates to the field of oil exploration, and furthermore, relates to a method for preventing H 2 S / CO 2 Co-corrosion oil well cement admixture and its preparation and application. Background technique [0002] In recent years, Sinopec and PetroChina have discovered in the exploration of marine strata in the Sichuan Basin that not only natural gas but also H 2 S, CO 2 Corrosive toxic gas. H in Puguang Gas Field 2 S content reaches 180g / m 3 , CO 2 Content up to 80g / m 3 . H in the Luojiazhai Gas Field in Kaijiang 2 S content reaches 150g / m 3 , CO 2 Content up to 100g / m 3 . In 2003, the "12.23" human tragedy occurred in the Luojia 16 well of the Luojiazhai gas field, and in 2006, the leakage of H2 contained in the Luojia 2 well 2 S natural gas, the two accidents have caused great damage to the surrounding life, property and environment. Accident analysis shows that the accident in Well Luojia 2 has a lot to do with poor...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/48C09K8/493
Inventor 周仕明丁士东王立志陈雷王其春杨红岐桑来玉初永涛汪晓静方春飞
Owner CHINA PETROLEUM & CHEM CORP
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