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High-temperature-resistant large-temperature-difference elastic-tough cement paste system and preparation method thereof

A cement slurry, large temperature difference technology, applied in chemical instruments and methods, drilling composition and other directions, can solve the problem of less research on high temperature resistant elastic and tough cement slurry system, the integrity of cement ring seal is easy to seal failure, long sealing It is difficult to guarantee the quality of cementing in the section, so as to prevent the decline of high temperature strength, improve the mechanical properties, and enhance the sealing performance.

Inactive Publication Date: 2021-03-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single-stage sealing of long sealing section is an exploration and attempt of super-long sealing section cementing in deep wells and ultra-deep wells, which is more conducive to the overall integrity of the cement sheath. , the top cement slurry is prone to over-retarding or even non-setting problems, and the brittle and hard characteristics of conventional cement stones make it easy for the cement sheath to fail after pressure changes in the casing, which seriously affects the long-term sealing of the cement sheath
[0003] At present, in view of the problem that the cementing quality of the long sealing section is not easy to guarantee, domestic and foreign studies have been carried out on long sealing section and large temperature difference cementing technology, which is mainly reflected in the large temperature difference retarder and fluid loss reducer. There are few studies on the high-temperature-resistant elastic-ductile cement slurry system for one-time sealing of the ultra-long sealing section of high-pressure gas wells, and the conventional large temperature difference system has the problem of easy sealing failure in terms of the integrity of the cement sheath

Method used

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  • High-temperature-resistant large-temperature-difference elastic-tough cement paste system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 600g of G-grade high sulfate-resistant oil well cement, 210g of strength-stabilizing material, 18g of expansion agent, 36g of elastic material, 0.6g of toughening material, 30g of fluid loss reducer, 15g of retarder, 9g of early strength agent, and defoamer 3g, fresh water 250g.

[0042] Among them: the G-grade high sulfur-resistant oil well cement is Jiahua G-grade high sulfate-resistant oil well cement, Sichuan Jiahua Cement Factory, G-grade high sulfate-resistant oil well cement;

[0043] The strength-stabilizing material is silicon powder (120 mesh);

[0044] The expansion agent is magnesium oxide;

[0045] The elastic material is an elastic particle (solid);

[0046] The toughening material is an organic toughening fiber;

[0047] The retarder AMPS-IA multi-polymer copolymer retarder;

[0048] The fluid loss reducer is an AMPS terpolymer fluid loss reducer;

[0049] The early strengthening agent is sodium metasilicate;

[0050] The defoamer is a silicon...

Embodiment 2

[0054] Weigh 600g of G-grade high sulfate-resistant oil well cement, 300g of strength-stabilizing material, 24g of expansion agent, 48g of elastic-resistant material, 6g of toughening material, 15g of fluid loss reducer, 18g of retarder, 6g of early strength agent, and defoamer 6g, fresh water 392g.

[0055] Among them: the G-grade high sulfur-resistant oil well cement is Jiahua G-grade high sulfate-resistant oil well cement;

[0056] The high-temperature strength stable material is compounded from silicon powder (120 mesh) and silicon powder (180 mesh), the mass ratio of the two is 2:3, and the two can be evenly mixed dry;

[0057] The expansion agent is magnesium oxide;

[0058] The elastic material is styrene-butadiene latex;

[0059] The toughening material is an inorganic mineral fiber;

[0060] The fluid loss reducer is an AMPS terpolymer fluid loss reducer;

[0061] Described set retarder is AMPS-IA multiple copolymer retarder;

[0062] The early strengthening agen...

Embodiment 3

[0066] Weigh 600g of G-grade high sulfur-resistant oil well cement, 360g of strength-stabilizing material, 30g of expansion agent, 60g of elastic material, 9g of toughening material, 12g of fluid loss reducer, 23g of large retarder, 9g of early strength agent, and 30g of interface enhancer , defoamer 9g, fresh water 300g.

[0067] Among them: the G-grade high sulfur-resistant oil well cement is Jiahua G-grade high sulfate-resistant oil well cement;

[0068] The high-temperature strength-stabilizing material is compounded of silicon powder (120 mesh), silicon powder (180 mesh), and microsilicon. The mass ratio of the three is 2:3:1, and the three can be evenly mixed dry;

[0069] The expansion agent is magnesium oxide;

[0070] The elastic material is styrene-acrylic latex;

[0071] The toughening material is an inorganic mineral fiber;

[0072] The fluid loss reducer is an AMPS terpolymer fluid loss reducer;

[0073] Described set retarder is AMPS-IA multiple copolymer ret...

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Abstract

The invention provides a high-temperature-resistant large-temperature-difference elastic-tough cement paste system, which comprises the following components in parts by weight: 100 parts of G-grade oil well cement, 2-10 parts of retarder, 1-8 parts of fluid loss agent, 2-15 parts of elastic material, 0.05-3 parts of toughening material, 0-75 parts of strength stabilizing material, 2-8 parts of expanding agent, 0.5-4 parts of early strength agent, 0-300 parts of a weighting agent, 0-10 parts of an interfacial cementation enhancer, 0.5-3 parts of a defoaming agent and 35-200 parts of water. According to the invention, the requirement for one-time sealing of an ultra-long sealing section of an ultra-deep high-temperature high-pressure oil-gas well can be met, the overall sealing performance of a cement sheath of the ultra-long sealing section is improved, and a wellhead is prevented from being under pressure.

Description

technical field [0001] The invention relates to a high-temperature-resistant and large-temperature-difference elastic-tough cement slurry system and a preparation method thereof. Background technique [0002] The wellhead pressure problem of high temperature and high pressure gas wells seriously affects the safe production of oil and gas wells, and the demand for long-term sealing of cement sheaths is urgent. Single-stage sealing of long sealing section is an exploration and attempt of super-long sealing section cementing in deep wells and ultra-deep wells, which is more conducive to the overall integrity of the cement sheath. , the cement slurry at the top is prone to over-retarding or even non-setting problems, and the brittle and hard characteristics of conventional cement stones make it easy for the cement sheath to fail after pressure changes in the casing, which seriously affects the long-term sealing of the cement sheath. [0003] At present, in view of the problem t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C09K8/467C04B111/50
CPCC04B28/00C09K8/467C04B2111/00724C04B2111/503C04B2201/20C04B2201/50C04B18/146C04B22/066C04B16/06C04B2103/22C04B2103/46C04B12/04C04B24/42C04B24/2676C04B14/38C04B24/2641C04B2103/0068
Inventor 高元杨广国周仕明陆沛青陶谦桑来玉杨红歧
Owner CHINA PETROLEUM & CHEM CORP
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