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Carbon dioxide corrosion resisting cement system for oil-gas well cementation

A carbon dioxide, well cementing technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of increasing the risk and cost of cementing operations, shortening the thickening time of cement systems, and poor anti-pollution performance of high-alumina cement, etc. problems, to achieve good resistance to Portland cement pollution, excellent CO2 corrosion resistance, and improve the effect of cementing quality

Inactive Publication Date: 2012-07-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

[0009] Although the high alumina cement-phosphate cement system has excellent resistance to CO 2 Corrosion performance, but due to the poor anti-pollution performance of high-alumina cement, the anti-pollution of the entire cement system is very poor. After mixing a small amount of Portland cement, the thickening time of the cement system will be greatly shortened, and it is easy to cause cementing Accidents, the cementing equipment needs to be thoroughly cleaned before the cement system is applied to prevent the residual Portland cement from contaminating the cement system, which greatly increases the risk and cost of cementing operations

Method used

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  • Carbon dioxide corrosion resisting cement system for oil-gas well cementation
  • Carbon dioxide corrosion resisting cement system for oil-gas well cementation

Examples

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Embodiment 1

[0023] Embodiment 1, the corrosion resistance performance evaluation of the carbon dioxide corrosion resistant cement system for oil and gas well cementing of the present invention

[0024] The formula of the carbon dioxide corrosion-resistant cement system for oil and gas well cementing of the present invention: aluminophosphate cement, 15% sodium hexametaphosphate, 3.25% sodium tetraborate, and 9% bentonite. The code name is 1#.

[0025] Portland cement-based carbon dioxide corrosion-resistant cement system formula: Jiahua G grade cement, 8% silica fume, 1% fluid loss reducer JS-2 (polyvinyl alcohol), 1% dispersant SWJZ-1 ( aldehydes and ketones). Code-named 2# for comparison.

[0026] Prepare cement slurry according to GB / T 19139-2003 standard for oil well cement test methods, wherein water and other components in the cement system formula are respectively proportioned by mass percentage based on the total weight of aluminophosphate cement or Jiahua G grade; Then pour th...

Embodiment 2

[0029] Example 2, the anti-pollution performance evaluation of the carbon dioxide corrosion-resistant cement system for oil and gas well cementing of the present invention

[0030] 1# cement system formula: aluminophosphate cement, 15% sodium hexametaphosphate, 3.25% sodium tetraborate, 9% bentonite.

[0031] 3# cement system formula: add 5% of Jiahua G-grade Portland cement (proportioned by mass percentage based on the total weight of aluminophosphate cement) on the basis of the 1# cement system formula.

[0032] 4# cement system formula: Add 10% of Jiahua G-grade Portland cement (proportioned by mass percentage based on the total weight of aluminophosphate cement) on the basis of the 1# cement system formula.

[0033] Prepare cement slurry according to GB / T 19139-2003 standard for oil well cement test methods, in which water is proportioned by mass percentage based on the total weight of aluminophosphate cement. Test 1#, 3# and 4# cement system formulations at 75 ° C , Thic...

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Abstract

The invention discloses a carbon dioxide corrosion resisting cement system for oil-gas well cementation, which comprises aluminate cement, soluble phosphate 10-20%, retarder 2-4.5% and fluid loss agent 3-10%, wherein the components are proportioned by mass with the aluminate cement as total weight. Cement stones of the cement system have excellent corrosion resistance under the conditions of high temperature, high pressure and high-concentration carbon dioxide, can meet the requirements for long-term cementation of an oil-gas well with high carbon dioxide content and provides guarantee for exploration, development, efficient production and environmental protection. The carbon dioxide corrosion resisting cement system for the oil-gas well cementation is suitable for the cementation of the oil-gas well with high temperature, high pressure and high carbon dioxide content.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a carbon dioxide corrosion-resistant cement system for oil and gas well cementing. Background technique [0002] At present, the cement used in oil and gas well cementing is mostly Portland cement system. In recent years, the CO of Portland cement in well cementing 2 Corrosion issues are of great concern. This is due to the high concentration of CO in the formation 2 The source is no longer just associated gas of oil and natural gas, but also CO 2 Oil displacement and CO 2 A large amount of CO injected by technologies such as sequestration 2 , which greatly increases the CO in the formation 2 concentration. Under high temperature, high pressure and humid environment, high concentration of CO 2 In a short period of time, Portland cement will be severely corroded, manifested as an increase in the permeability of the cement and a decrease in streng...

Claims

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Application Information

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IPC IPC(8): C09K8/493
Inventor 步玉环郭辛阳郭胜来马聪
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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