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Mechanical plugging—solid expandable tubular refracturing technology

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Abstract

To solve the three major problems of low production, low efficiency and low permeability of oil fields, it is necessary to develop new tight oil layers or shale oil outside the original perforated section in the well that has been perforated. The key to the success of repeated fracturing operations is the ability to block the original perforation of the well. At present, with tubing fracturing construction, volume fracturing of the target reservoir cannot be achieved due to limited displacement, and the effect of reservoir transformation is not obvious, affecting the productivity of the old well. Based on the above problems, this paper proposes a new blocking method suitable for fracturing wells - solid expansdable tubular (SET) plugging. In this paper, it established SET-expansion cone-casing-rubber ring 2D dynamic model which considers the friction, and contact, to analyze the effect of compression and length of rubber ring and the constraint condition of SET on sealing performance; laboratory experiments were carried out and data on driving force, sealing capacity and suspension force were obtained. The results show that optimizing the parameters of expansion cone structure can effectively reduce the residual stress of SET and driving force after expansion; the construction method of SET and the parameters of rubber ring are the main factors that affect the suspension sealing ability, and paper proposes an effective solution; in addition, experiment results show that the SET meets the requirements of fracturing construction with internal pressure greater than 60 MPa and suspension force greater than 600 kN after expansion, and can be used to seal the well body structure of refracturing wells with fewer perforations and shorter distances, and the diameter can be guaranteed to reach 112 mm. The research results provide new ideas and solutions for repeated pressure wells and high-pressure plugging.

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Acknowledgments

This work was supported jointly by the National Natural Science Foundation of China (Grant No. 51674214 and 51604234), Youth Scientific Research Innovation Team Project of Sichuan Province (2017TD0014), and the State Key Laboratory of Mechanical Transmissions open fund (Grant No. SKLMT-KFKT-201610).

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Authors and Affiliations

  1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500, China

    Xiaohua Zhu, Feilong Cheng, Changshuai Shi & Kailin Chen

Authors
  1. Xiaohua Zhu
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  2. Feilong Cheng
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  3. Changshuai Shi
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  4. Kailin Chen
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Corresponding author

Correspondence to Xiaohua Zhu.

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Recommended by Editor Chongdu Cho

Xiaohua Zhu received his B.S., M.S., Ph.D. degrees in mechanical design and theory from Southwest Petroleum University of China, in 2000, 2002, and 2005, respectively. He is currently a Professor at the School of Mechatronic Engineering in the Southwest Petroleum University, as well as a member of the Chinese Mechanical Engineering Society. His main research interests include design downhole drilling tools, drill string dynamics analysis, new methods for improving drilling efficiency.

Feilong Cheng received his bachelor of engineering degree from Southwest Petroleum University in 2017, majoring in mechanical design, manufacturing and automation. Since September 2018, he has been studying for his master’s degree in Southwest Petroleum University. His main research direction is the new solid expandable tubular technology.

Changshuai Shi received his B.S. degree in process equipment and control from the Southwest University of Science and Technology in 2008, and M.S. and Ph.D. degrees in mechanical design and theory from Southwest Petroleum University of China, in 2011 and 2014, respectively. His main research interests include design of downhole drilling tools, fatigue of rubber component, and optimization of process craft of screw pump.

Kailin Chen, male, graduate student, graduated from the Mechanical Engineering Department of Southwest Petroleum University with a bachelor’s degree in mechanical engineering in June 2017. He is currently engaged in research on solid expandable tubular and drilling speed-up tools.

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Zhu, X., Cheng, F., Shi, C. et al. Mechanical plugging—solid expandable tubular refracturing technology. J Mech Sci Technol 34, 2357–2364 (2020). https://doi.org/10.1007/s12206-020-0512-x

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  • DOI: https://doi.org/10.1007/s12206-020-0512-x

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