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Oil-well cement additive against carbon dioxide corrosion as well as preparation method and application thereof

An oil well cement and carbon dioxide technology, which is applied in earth-moving drilling, wellbore/well components, etc., can solve problems such as difficulty in promotion, and achieve the effects of reducing permeability, preventing erosion, and having good resistance to carbon dioxide corrosion.

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

However, the above-mentioned systems are highly targeted in application, and there are large differences due to the specific geological conditions and production conditions of each oilfield, such as temperature and pressure, so it is difficult to generalize

Method used

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  • Oil-well cement additive against carbon dioxide corrosion as well as preparation method and application thereof
  • Oil-well cement additive against carbon dioxide corrosion as well as preparation method and application thereof
  • Oil-well cement additive against carbon dioxide corrosion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Take 60%wt pozzolanic minerals, add 5%wt of microsilica fume, 5%wt of slag, 15%wt of aluminum salt minerals, put them into a dry ball mill, grind them finely in the dry ball mill and mix them evenly to reach a fineness of 200 mesh Finally, put it into a double-helix mixer, add 10%wt paraffin organic material and 5%wt sodium methyl siliconate to mix, mix repeatedly for 2 hours, and prepare gray powder admixture 1 after being uniform #product.

Embodiment 2

[0053] Take 40%wt pozzolanic minerals, add 15%wt of silica fume, 5%wt of slag, and 20%wt of aluminum salt minerals, put them into a dry ball mill, grind them finely in the dry ball mill and mix them evenly to reach a fineness of 200 mesh Finally, put it into a double-screw mixer, add 17%wt paraffin organic material and 3%wt of sodium methyl siliconate to mix, mix and mix repeatedly for 2 hours, and prepare gray powder admixture 2 after being uniform #product.

Embodiment 3

[0055] Take 30%wt pozzolanic minerals, add 10%wt micro-silica fume, 15%wt slag, 12%wt aluminum salt minerals, put them into a dry ball mill, grind them finely in the dry ball mill and mix evenly to reach a fineness of 200 mesh Finally, put it into a double-screw mixer, add 30%wt paraffin organic material and 3%wt of sodium methyl siliconate to mix, mix repeatedly for 2 hours, and prepare gray powder additive 3 after being uniform #product.

[0056] 2. Application example of oil well cement admixture to prevent carbon dioxide corrosion

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PUM

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Abstract

The invention provides an oil-well cement additive against carbon dioxide corrosion as well as a preparation method and application thereof, relating to the field of well cementation of oil-well cement. The oil-well cement additive mainly comprises the following raw materials in percentage by weight of: 20-65%wt of volcanic gray minerals, 2-25%wt of silica fume, 5-25%wt of aluminum salt mineral, 5-35%wt of organic paraffin material, 1-10%wt of methyl silanol sodium, and 3-25%wt of slag. When 15-60 parts of the oil-well cement additive is added into 100 parts of cement, the compactness of cement columns can be strengthened, with low gas permeability and strong resistance against carbon dioxide corrosion. The oil-well cement additive is suitable for different temperatures, and has wider application.

Description

Technical field: [0001] The present invention relates to an oil well cement admixture, more particularly, relates to an oil well cement admixture for preventing carbon dioxide corrosion, its preparation method and application. Background technique: [0002] Carbon dioxide exists in formations as an associated gas in oil and gas production or as a component of formation water. Carbon dioxide will corrode the oil well cement ring column, that is, cement stone in a wet environment. As we all know, the oil well cement ring column mainly plays the role of sealing off oil, gas and water, supporting and protecting the casing, and prolonging the life of the oil and gas well. The pilot corrosion of the cement ring column can cause and accelerate the corrosion and destruction of the casing. And may induce other downhole accidents, shorten the production life of oil and gas wells. [0003] Currently domestic CO 2 Although the problem of corroding downhole tubing has attracted the a...

Claims

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Application Information

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IPC IPC(8): C09K8/54
Inventor 周仕明丁士东王立志杨红歧
Owner CHINA PETROLEUM & CHEM CORP
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