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Cement paste system and preparation method thereof

A cement slurry and system technology, applied in the field of cement slurry system and its preparation, can solve the problems of damage, loss of sealing annulus, cement annulus can not maintain elastic properties, etc., to ensure sealing ability and effective interlayer isolation , The effect of reducing the risk of pressure in the annular space

Active Publication Date: 2020-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The basic properties of the high-temperature-resistant and high-density cementing slurry currently used can meet the construction requirements, but considering the requirements of the shale gas target layer cementing construction, the existing cement slurry system does not add enough elastic materials, and the cement sheath cannot maintain a good Elastic performance, easy to be damaged in the later stage of large-scale fracturing construction, and lose the effect of sealing the annulus

Method used

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  • Cement paste system and preparation method thereof
  • Cement paste system and preparation method thereof
  • Cement paste system and preparation method thereof

Examples

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preparation example Construction

[0031] Unless otherwise specified, the high-temperature-resistant elastic material used in each embodiment of the present invention and comparative examples is SFP-1 purchased from Dezhou Continental Shelf Petroleum Engineering Technology Co., Ltd., which is nano-silica-rubber composite particles. The preparation method includes the following steps: Add rubber particles with an average particle size of 160 mesh and nano-silicon with an average particle size of 200nm to the mixer of the particle compounding system in a certain proportion, and adjust the experimental process parameters of the quantitative metering system so that the nano-silicon and rubber particles are fully mixed in the host machine. Contacting, mixing, and under the control of the control system, the powder is finally obtained in the collection device, forming a core-shell structure of micro-silicon-coated rubber particles.

[0032] Unless otherwise specified, the G-grade oil well cement used in the examples a...

Embodiment 1

[0041] (1) Dry mix 100 parts by mass of G grade oil well pure cement, 60 parts by mass of weighting agent, 30 parts by mass of high temperature strength stabilizer and 4 parts by mass of high temperature resistant elastic material, and form a large sample of ash for storage and in a closed ash tank ready for use.

[0042] (2) Add 4 parts by mass of anti-high temperature fluid loss reducer, 5 parts by mass of high temperature resistant inorganic anti-channeling emulsion, 0.8 parts by mass of dispersant, 0.8 parts by mass of slurry regulator and 1 part by mass of retarder into 55 parts by mass of on-site water , fully circulate to ensure that the admixture is completely dissolved and mixed evenly to form a large sample of water, which can be used for construction.

[0043] (3) Pour the large-sample ash into the large-sample water and stir well to form a high-density cement slurry suitable for shale gas well cementing.

[0044] The dosage of each component is shown in Table 1. ...

Embodiment 2

[0046](1) Dry mix 100 parts by mass of G grade oil well cement, 70 parts by mass of weighting agent, 40 parts by mass of high temperature strength stabilizer and 5 parts by mass of elastic material, form a large sample of ash and store it in a closed ash tank for future use use.

[0047] (2) 4 mass parts of fluid loss reducer, 6 mass parts of high temperature resistant inorganic anti-channeling emulsion, 1 mass part of dispersant, 0.8 mass part of slurry regulator and 1.2 mass parts of retarder are added to 57 mass parts of on-site water, fully Circulation to ensure that the admixture is completely dissolved and mixed evenly to form a large sample of water, which can be used for construction.

[0048] (3) Pour the large-sample ash into the large-sample water and stir well to form a high-density cement slurry suitable for shale gas well cementing.

[0049] The dosage of each component is shown in Table 1.

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Abstract

The invention provides a cement paste system and a preparation method thereof. The cement paste system comprises the following raw materials: G-grade oil well cement, a high-temperature-resistant elastic material, a high-temperature-resistant fluid loss agent, a high-temperature-resistant inorganic anti-channeling emulsion, a weighting agent, a high-temperature strength stabilizer, a dispersing agent, a paste regulator, a retarder and water. A cement sheath formed by using the cement slurry system in a high-temperature and high-pressure environment and in a later large fracturing constructionprocess has good elastic performance, can maintain the integrity for a long time, effectively ensures interlayer sealing, and reduces the risk of sustained casing pressure of a shale gas well.

Description

technical field [0001] The invention provides a cement slurry system and a preparation method thereof, in particular a high-temperature resistant high-density cement slurry system suitable for deep shale gas well cementing. Background technique [0002] In recent years, the exploration and development of shale gas has continued to deepen, and the technology of deep shale gas exploration and development has become the focus of research. [0003] Deep shale gas generally has geological characteristics such as high temperature and high density, which poses a huge challenge to existing drilling and completion technologies, especially cementing technologies. [0004] The basic properties of the high-temperature-resistant and high-density cementing slurry currently used can meet the construction requirements, but considering the requirements of the shale gas target layer cementing construction, the existing cement slurry system does not add enough elastic materials, and the cement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C09K8/467C09K8/48
CPCC04B28/00C09K8/467C09K8/48C09K2208/10C04B2201/50C04B2201/20C04B2111/00146C04B18/142C04B18/146C04B18/22C04B22/02C04B20/0008C04B24/16C04B14/06C04B24/30C04B12/04C04B22/002C04B2103/22Y02W30/91
Inventor 陶谦杜晓雨谭春勤刘飞陆沛青张林海
Owner CHINA PETROLEUM & CHEM CORP
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