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
CN103074044AActive Publication Date: 2013-05-01CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2013-05-01

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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.
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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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