Plugging cement composition for drilling fractured leakage as well as cement slurry and preparation method thereof

A technology of composition and cement slurry, which is applied in the direction of drilling composition, chemical instruments and methods, educts, etc., can solve the problems of cracked leakage, malignant leakage, plugging success rate, etc., and achieve simple and adjustable formula, plugging Quick and wide-ranging effects

Inactive Publication Date: 2018-02-23
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a plugging cement composition for drilling fractured leakage, so as to solve the current problems of easy occurrence of fractured leakage and low plugging success rate of malignant leakage in the process of drilling and cementing

Method used

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  • Plugging cement composition for drilling fractured leakage as well as cement slurry and preparation method thereof
  • Plugging cement composition for drilling fractured leakage as well as cement slurry and preparation method thereof
  • Plugging cement composition for drilling fractured leakage as well as cement slurry and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The plugging cement composition for drilling fracture loss in this embodiment consists of the following components by weight: 100 parts of oil well cement, 9.5 parts of lightening agent, 9.5 parts of micro silicon, 1.2 parts of expansion agent, and fluid loss reducer 2 parts, 0.28 parts of retarder, 0.06 parts of tackifier, 1.2 parts of short fiber, 2.4 parts of long fiber; lightening agent is artificial floating beads, short fiber is glass fiber with a length of 5mm, and long fiber is glass fiber with a length of 19mm For fiber, the retarder is calcium lignosulfonate, the tackifier is polyacrylamide potassium salt, and the fluid loss reducer is polyvinyl alcohol cross-linked by borax.

[0035] The cement slurry in this embodiment is composed of the plugging cement composition for drilling fluid fracture loss and water in this embodiment, and the mass ratio of water and oil well cement in the plugging cement composition for drilling fluid fracture loss is 107 :100.

[...

Embodiment 2

[0040] The plugging cement composition for drilling fracture loss in this embodiment is composed of the following components in parts by weight: 100 parts of oil well cement, 36 parts of lightening agent, 7 parts of micro silicon, 1.4 parts of expansion agent, and fluid loss reducer 3.6 parts, 0.15 parts of retarder, 0.05 parts of tackifier, 1.4 parts of short fibers, 2.8 parts of long fibers; lightening agent is artificial floating beads, short fibers are asbestos fibers with a length of 3 mm, and long fibers are asbestos fibers with a length of 6 mm For fiber, the retarder is calcium lignosulfonate, the tackifier is polyacrylamide potassium salt, and the fluid loss reducer is polyvinyl alcohol cross-linked by borax.

[0041] The cement slurry in this embodiment is composed of the plugging cement composition for drilling fluid fracture loss and water in this embodiment, and the mass ratio of water and oil well cement in the plugging cement composition for drilling fluid fractu...

Embodiment 3

[0044]The plugging cement composition for drilling fracture loss in this embodiment consists of the following components by weight: 100 parts of oil well cement, 9.5 parts of lightening agent, 9.5 parts of micro silicon, 1.2 parts of expansion agent, and fluid loss reducer 2.4 parts, 0.28 parts of retarder, 0.06 parts of viscosifier, 3.5 parts of short fiber, 1 part of long fiber; lightening agent is artificial floating beads, short fiber is glass fiber with a length of 3mm, and long fiber is asbestos with a length of 10mm For fiber, the retarder is calcium lignosulfonate, the tackifier is polyacrylamide potassium salt, and the fluid loss reducer is polyvinyl alcohol cross-linked by borax.

[0045] The cement slurry in this embodiment is composed of the plugging cement composition for drilling fluid fracture loss and water in this embodiment, and the mass ratio of water and oil well cement in the plugging cement composition for drilling fluid fracture loss is 107 :100.

[004...

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Abstract

The invention relates to a plugging cement composition for drilling fractured leakage as well as cement slurry and a preparation method thereof, and belongs to the technical field of drilling compositions. The plugging cement composition is prepared from the following components in parts by weight: 100 parts of oil well cement, 9 to 36 parts of a lightening admixture, 7 to 10 parts of micro-silicon, 1 to 2 parts of an expanding agent, 2 to 3.6 parts of a fluid loss agent, 0.15 to 2 parts of a retarder, 0.036 to 0.1 part of a tackifier, 0.6 to 3.5 parts of staple fibers and 0.18 to 3.6 parts ofcontinuous fibers. The lengths of the staple fibers are 1 to 5mm and the lengths of the continuous fibers are 3 to 19mm. The plugging cement composition has the advantages of simple and adjustable formula, wide application range, capability of meeting needs of leakage in different forms, fast onset of plugging effects and extremely low probability of secondary leakage; particularly, the pluggingcement composition has obvious advantages for the drilling fractured leakage with the depth of 3 to 10mm.

Description

technical field [0001] The invention relates to a plugging cement composition for drilling fractured leakage, cement slurry and a preparation method thereof, belonging to the technical field of drilling compositions. Background technique [0002] During the construction of oil and gas wells in the petroleum industry, complex leakage problems are generally faced. The leakage in cementing not only causes insufficient return of cement slurry, but also affects the improvement of displacement efficiency, resulting in poor cementing quality, which is not conducive to the continued drilling of oil and gas wells, and brings hidden dangers to the protection of freshwater layers and the safe implementation of oil and gas well stimulation. Well quality and faster drilling cycle, research on various cementing leak prevention and plugging technologies have attracted much attention. [0003] At present, the common plugging methods include bridging slurry plugging, cement slurry plugging,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/467C09K2208/08Y02P20/141
Inventor 刘福韩婧蒋新立席银申吴天乾李正国李明忠李德红李季
Owner 中石化石油工程技术服务有限公司
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