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Anti-seepage plugging admixture for well cementation, and anti-seepage plugging cement paste

A technology of external admixture and cement slurry, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as insufficient solution of leakage problems, hidden dangers, influence on construction safety, etc., so as to reduce apparent permeability, Outstanding plugging effect and good plugging performance

Inactive Publication Date: 2020-04-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, various plugging materials and cement slurry systems also have certain disadvantages. For example, most of the plugging materials contain fiber and gel materials, which can easily affect the rheological properties of cement slurry, making it difficult to pump and requiring additional construction procedures; However, measures such as shortening the thickening time will affect the construction safety, and there are certain hidden dangers; in addition, most anti-seepage and plugging materials cannot fully solve the leakage problem

Method used

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  • Anti-seepage plugging admixture for well cementation, and anti-seepage plugging cement paste
  • Anti-seepage plugging admixture for well cementation, and anti-seepage plugging cement paste
  • Anti-seepage plugging admixture for well cementation, and anti-seepage plugging cement paste

Examples

Experimental program
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Effect test

Embodiment 1

[0049] An anti-seepage and plugging external admixture for well cementing, see Table 1 for each component and its weight. In the silicon carbide used therein, the sum of the particle volumes with a particle diameter of 1-10 μm accounts for more than 90% of the total volume of the silicon carbide.

[0050] According to the ratio in Table 1, the inorganic hard particle silicon carbide and the organic soft particle styrene-butadiene copolymer are fully mixed in proportion to obtain the anti-seepage and plugging external admixture for well cementing. For the particle size distribution curve of the anti-seepage plugging external admixture for well cementing, please refer to figure 1 .

[0051] The composition and the weight of the anti-seepage plugging external admixture for well cementing of table 1 embodiment 1

[0052] type Component parts by weight Inorganic hard particles Silicon carbide 5.0 Organic soft particles Styrene-butadiene copolymer 1.0...

Embodiment 2

[0054] An anti-seepage and plugging external admixture for well cementing, see Table 2 for each component and its weight. Among them, in silicon carbide and titanium dioxide, the sum of the particle volumes with a particle diameter of 1-10 μm accounts for more than 90% of the sum of the volumes of silicon carbide and titanium dioxide.

[0055] The composition and the weight of the anti-seepage plugging external admixture of table 2 embodiment 2

[0056]

[0057] According to the ratio in Table 2, the above two kinds of inorganic hard particles and two kinds of organic soft particles are fully mixed and evenly mixed according to their respective proportions, and the anti-seepage and plugging external admixture for well cementing is obtained. For the particle size distribution curve of the anti-seepage plugging external admixture for well cementing, please refer to figure 2 .

Embodiment 3

[0059] An anti-seepage and plugging external admixture for well cementing, see Table 3 for each component and its weight. Among silicon carbide, titanium dioxide, zirconium dioxide and diatomaceous earth, the sum of the particle volumes with a particle diameter of 1-10 μm accounts for more than 90% of the total volume of all hard particles.

[0060] The composition and the weight of the anti-seepage plugging external admixture of table 3 embodiment 3

[0061]

[0062]

[0063] According to the proportions in Table 3, the above four kinds of inorganic hard particles and three kinds of organic soft particles are fully mixed and evenly mixed according to their respective proportions, and the anti-seepage and plugging external admixture for well cementing is obtained. For the particle size distribution curve of the anti-seepage plugging external admixture for well cementing, please refer to image 3 .

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Abstract

The invention provides an anti-seepage plugging admixture for well cementation, and anti-seepage plugging cement paste, wherein the anti-seepage plugging admixture comprises 5-10 parts by weight of water-insoluble inorganic particles and 1-3 parts by weight of water-insoluble organic polymer particles, the particle size distribution interval of the inorganic particles is 0.1-20 [mu]m, and the particle size distribution interval of the organic polymer particles dispersed in water is 0.1-3 [mu]m. The anti-seepage plugging admixture and the anti-seepage plugging cement paste provided by the invention have good plugging effects on rock cores with various permeabilities, and have good stability, good thickening performance, good water loss performance, good compressive strength and good rheological property.

Description

technical field [0001] The invention belongs to the technical field of oil field cementing anti-seepage and plugging, and in particular relates to an anti-seepage and plugging external admixture for well cementing and an anti-seepage and plugging cement slurry. Background technique [0002] The anti-seepage and plugging technology is mainly realized by improving the seepage resistance of cement slurry and blocking the seepage channel. In order to solve the problem of cementing in leaky formations, experts at home and abroad have continuously explored new plugging materials for many years, developed many new plugging agents, and achieved very good research results, making the leakage prevention in cementing Plugging work has made great progress. There are a lot of existing plugging materials, which can be divided into bridging plugging materials, rapid fluid loss plugging materials, resolvable plugging materials, chemical plugging materials, self- It is suitable for several...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C04B16/04C04B28/02
CPCC04B28/026C04B40/0042C04B2111/00724C04B2201/50C09K8/467C04B14/324C04B16/04C04B14/305C04B14/306C04B14/08C04B2103/22C04B2103/0068C04B2103/50
Inventor 艾正青曾建国袁中涛邹双张峰李鹏晓刘爱萍刘忠飞夏元博徐力群熊钰丹王银东王建瑶高海洋石凌龙王中丽敖康伟杨昆鹏
Owner PETROCHINA CO LTD
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