Volume 42 Issue 5
Sep.  2025
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2025  >  42(5): 686-695
LIU Yintao, KANG Zheng, ZHANG Guodong, et al.Plugging diagnosis and treatment measures of gas well for leikoupo formation in western sichuan basin[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：686-695 doi: 10.12358/j.issn.1001-5620.2025.05.016
Citation: LIU Yintao, KANG Zheng, ZHANG Guodong, et al.Plugging diagnosis and treatment measures of gas well for leikoupo formation in western sichuan basin[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：686-695 doi: 10.12358/j.issn.1001-5620.2025.05.016
shu

Plugging Diagnosis and Treatment Measures of Gas Well for Leikoupo Formation in Western Sichuan Basin

doi: 10.12358/j.issn.1001-5620.2025.05.016
  • 1.

    Petroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang, Sichuan 618000

  • 2.

    SINOPEC Chuanxi Natural Gas Exploration and Development Co., Ltd., Chengdu, Sichuan 611930

  • 3.

    The Second Gas Production Plant of SINOPEC Southwest Oil and Gas Company, Langzhong, Sichuan 637400

  • Received Date: 2025-05-13
  • Rev Recd Date: 2025-06-19
  • Publish Date: 2025-09-30
    Abstract
  • The Leikoupo Formation gas reservoir in West Sichuan Basin has been significantly plugged for more than 40 wells since the 18 wells were successively started production in 2023, which has seriously affected the gas field production. Based on systematic analysis of plugging composition and origin, combined with machine learning algorithms, this study investigates the influencing factors and distribution patterns of downhole plugging zones. A classification and mitigation strategy has been established using quantitative blockage diagnostics. The results indicate that: ①Plugging types can be categorized into organic, inorganic, and compound plugs. The composition of solid deposits shows certain similarities with those observed in early-stage sour gas fields in other regions of China. ②Early-stage plugging is associated with drilling, stimulation, and completion operations. Most plugs are distributed along production tubing, with slightly higher frequency observed near the wellhead and in the front section of horizontal well production zones. ③Acidizing fluids prepared with 15% HCl achieve a dissolution rate of 65.7% for inorganic deposits and a viscosity reduction exceeding 90% for organic substances. ④The integrated process combining quantitative diagnostics with coiled tubing intervention achieved a 100% success rate in 41 field applications, with an average productivity recovery rate of 128.6% post-treatment. The above technical results can provide a reference for similar sulfur-containing gas well plugging management.

     

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