Research and Application of Tough Cement Slurry Systems with Multi-Scale Fiber

ZOU Shuang; FENG Minghui; ZHANG Tianyi; ZOU Jianlong; ZENG Jianguo; ZHAO Baohui

doi:10.11911/syztjs.2020084

Volume 48 Issue 6

Nov. 2020

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Petroleum Drilling Techniques > 2020 > 48(6): 40-46. > DOI: 10.11911/syztjs.2020084

ZOU Shuang, FENG Minghui, ZHANG Tianyi, ZOU Jianlong, ZENG Jianguo, ZHAO Baohui. Research and Application of Tough Cement Slurry Systems with Multi-Scale Fiber[J]. Petroleum Drilling Techniques, 2020, 48(6): 40-46. DOI: 10.11911/syztjs.2020084

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Research and Application of Tough Cement Slurry Systems with Multi-Scale Fiber

ZOU Shuang^{1, 2, 3,},
FENG Minghui^{1, 2, 3},
ZHANG Tianyi^{1, 2, 3},
ZOU Jianlong^{1, 2, 3},
ZENG Jianguo^{1, 2, 3},
ZHAO Baohui^{1, 2, 3}

1.
CNPC Tianjin Boxing Engineering Science & Technology Co., Ltd., Tianjin, 300451, China
2.
Laboratory of Cementing Technology, CNPC Key Laboratory of Drilling Engineering, Tianjin, 300451, China
3.
Laboratory of Cementing Technology, National Engineering Laboratory of Petroleum Drilling Technology, Tianjin, 300451, China

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Received Date: January 07, 2020
Revised Date: June 11, 2020
Available Online: August 17, 2020

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Abstract

Abstract

To solve the problems of high brittleness, low tensile strength, poor impact resistance and fracture resistance of the cement stone in oil wells, a multi-scale fiber toughener BCE-230S was formed by selecting inorganic fibers in three different scales and conducting orthogonal tests for compound. In addition, the effects of the dosage of BCE-230S on the construction performance of cement slurry and the mechanical properties of cement were investigated, the optimal dosage was determined, by which a tough cement slurry system with multi-scale fiber was formed. The results showed that the splitting tensile strength, compressive strength and impact resistance of the cement stone were significantly improved when compared with common cement.Young’s modulus decreased significantly and the construction performance was ideal. The tough cement slurry system with multi-scale fiber was applied in the low permeability reservoir in the Jidong Oilfield for more than 10 times in the well, and the cementing quality of the two cementing surfaces was measurably improved compared with that of adjacent wells. Fracturing in later stage was successful, and no fluid channeling was observed during well testing. The results indicated that the tough cement slurry system with multi-scale fiber can effectively solve the problem of brittleness of cement stone in oil well, so as to ensure the integrity of the wellbore and the long-term cementing quality, with a potential for wide application.
- low permeability reservoir,
- cementing,
- multi-scale fiber,
- toughener,
- cement slurry,
- mechanical property

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