Oil-well cement additive for preventing corrosion of hydrogen sulfide as well as preparation method and application thereof

A technology of oil well cement and admixture, which is applied in the direction of earthwork drilling, wellbore/well parts, etc., to achieve good H2S corrosion resistance, good corrosion resistance, and slow down the effect of corrosion speed

Active Publication Date: 2011-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the shortcoming of this cement is, the paraffin of organic material in the ceme

Method used

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  • Oil-well cement additive for preventing corrosion of hydrogen sulfide as well as preparation method and application thereof
  • Oil-well cement additive for preventing corrosion of hydrogen sulfide as well as preparation method and application thereof
  • Oil-well cement additive for preventing corrosion of hydrogen sulfide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Take 60%wt pozzolanic minerals, add 5%wt of microsilica fume, 5%wt of slag, 15%wt of aluminum salt minerals, and 5%wt of coal gangue, put them into a dry ball mill, grind them finely in the dry ball mill and mix them After the fineness reaches 200 meshes evenly, put it into the double-screw mixer, add 10%wt asphalt organic material, mix and mix, mix and mix repeatedly for 2 hours, and the product is obtained after being uniform, the product is taupe powder 1# product.

Embodiment 2

[0054] Take 40%wt pozzolanic minerals, add microsilica fume 10%wt, slag 5%wt, nano-aluminum salt minerals 20%wt, coal gangue 5%wt, put into dry ball mill, grind finely in dry ball mill and mix After mixing evenly to reach a fineness of 200 mesh, put it into a double-screw mixer, add 20%wt asphalt-based organic core-shell materials for mixing, and mix repeatedly for 2 hours. After being uniform, the product is gray-brown powder 2# product.

Embodiment 3

[0056] Take 30%wt pozzolanic minerals, add 5%wt of silica fume, 15%wt of slag, 10%wt of aluminum salt minerals, and 5%wt of coal gangue, put them into a dry ball mill, grind them finely in the dry ball mill and mix them After the uniformity reaches 200 mesh fineness, put it into a double-helix mixer, add 30%wt nano-pitch organic core-shell materials for mixing, and mix repeatedly for 2 hours, and the product is obtained after being uniform, and the product is taupe powder 3#.

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Abstract

The invention provides an oil-well cement additive for preventing corrosion of hydrogen sulfide as well as a preparation method and an application thereof, belonging to the field of oil-well cement well cementation. The oil-well cement additive mainly comprises the following components in percent by weight: 20-75% of volcano cinerea mineral, 2-35% of silica powder, 5-30% of aluminum salt mineral,2-35% of pitch organic material, 1-10% of gangue, and the like. By adding 15-60 parts of the oil-well cement additive in the well cementation cement slurry system with 100 parts of cement, the invention can enhance the tightness of a cement loop pillar, has low gas permeability and strong ability for resisting the corrosion of hydrogen sulfide, is suitable for different temperatures in the bad well cementation environment and has wider application range.

Description

technical field [0001] The invention relates to an oil well cement admixture, more specifically, an oil well cement admixture for preventing hydrogen sulfide corrosion, and a preparation method and application thereof. Background technique [0002] In recent years, in the development of some oil and gas fields, a large amount of hydrogen sulfide (H 2 S) Harmful gas, Sinopec and PetroChina found 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 . From the "12.23" major accident in Luojia No. 16 well in the Luojiazhai gas field in 2003 to the leakage of H 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 ...

Claims

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Application Information

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IPC IPC(8): C09K8/54
Inventor 周仕明王立志陈雷桑来玉
Owner CHINA PETROLEUM & CHEM CORP
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