Volume 40 Issue 3
May  2023
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LAN Lin.Study on special dissolving agent of marine epoxy resin plugging agent in western Sichuan[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：410-414 doi: 10.12358/j.issn.1001-5620.2023.03.019
Citation: LAN Lin.Study on special dissolving agent of marine epoxy resin plugging agent in western Sichuan[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：410-414 doi: 10.12358/j.issn.1001-5620.2023.03.019
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Study on Special Dissolving Agent of Marine Epoxy Resin Plugging Agent in Western Sichuan

doi: 10.12358/j.issn.1001-5620.2023.03.019

  • The Engineering Technology Institute of Southwest Petroleum & Gas Branch, Deyang , Sichuan 618000

  • Received Date: 2022-11-27
  • Rev Recd Date: 2023-01-04
    • Available Online: 2023-07-21
  • Publish Date: 2023-05-30
    Abstract
  • The marine facies of the Chuanxi gas field has characteristics of ultra-deep high temperature, salt gypsum layer, and high sulfur content. The development of the triple well system with ultra-deep and high inclination results in frequent malignant and recurrent losses. Epoxy resin plugging agent has the characteristics of pumpability at room temperature, temperature control of consolidation time, high consolidation compressive strength, and significant sealing effect for large cracks. However, its viscosity is relatively high, and it is prone to adhesion and bonding in the wellbore and pipeline. After consolidation, it is insoluble and non melting, making it extremely difficult to dissolve and unblock. In response to the problems related to epoxy resin plugging agent, dissolution mechanism analysis, dissolution orthogonal analysis, and optimization of the anti-corrosion performance of the dissolution agent are conducted, develop a dissolution agent for epoxy resin plugging agent, which has a dissolution rate of 97.82% for epoxy resin plugging agent under conditions of 120 ℃ and 24 hours. The corrosion rate for N80 steel sheet is only 0.0086 g/(m2·h), which is lower than the evaluation standard for slight corrosion (0.022 g/(m2·h)). This provides a new way to solve technical problems such as rapid dissolution, unblocking, and downhole string safety after malignant leakage plugging operations.

     

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