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Analysis on Fishing Failure Mechanism of Downhole Choke in Tight Gas Well

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Abstract

In view of the failure causes of downhole choke fishing in tight gas wells, taking the choke fishing failure in Daning–Jixian block as representative, the failure causes are summarized through the actual fishing data and phenomena on site. This study analyzes from 11 aspects: (1) the influence of fishing time on throttle fishing; (2) the influence of the running depth of the choke on the fishing success rate of the choke; (3) the influence of gas well effusion on the success rate of choke fishing; (4) the influence of sand production on choke fishing; (5) the influence of restrictor structure on fishing success rate; (6) life analysis of restrictor; (7) type selection of throttle; (8) throttle structure design; (9) choke fishing; (10) choke sand blockage; (11) impact of switching well. This paper analyzes the methods to improve the fishing success rate of a choke and puts forward a reasonable solution to the fishing failure of choke, to ensure the safety of tight gas well construction.

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Acknowledgments

This project was supported by the National Natural Science Foundation of China (52004215, 12101482, 51674199).

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Authors and Affiliations

  1. School of Mechanical Engineering, Xi’an Shiyou University, Xi’an, 710065, Shanxi, People’s Republic of China

    Jie Zheng, Yihua Dou & Zhenzhen Li

  2. School of Science, Xi’an University of Architecture and Technology, Xi’an, 710055, Shanxi, People’s Republic of China

    Yarong Zhang

  3. Xi’an Special Equipment Inspection Institute, Xi’an, 710065, Shanxi, People’s Republic of China

    Jie Zheng, Xu Yang & Cheng Bi

  4. School of Power and Energy, Northwestern Polytechnical University, Xi’an, 710072, Shanxi, People’s Republic of China

    Jie Zheng

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  1. Jie Zheng
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Correspondence to Jie Zheng.

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Zheng, J., Dou, Y., Li, Z. et al. Analysis on Fishing Failure Mechanism of Downhole Choke in Tight Gas Well. J Fail. Anal. and Preven. 22, 426–435 (2022). https://doi.org/10.1007/s11668-022-01338-4

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  • DOI: https://doi.org/10.1007/s11668-022-01338-4

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