Volume 40 Issue 2
Mar.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(2): 163-168
WEI Anchao, LIU Shujie, JIANG Donglei, et al.Synthesis and evaluation of epoxy resin self-degradation plugging agent for fractured formation[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：163-168 doi: 10.12358/j.issn.1001-5620.2023.02.003
Citation: WEI Anchao, LIU Shujie, JIANG Donglei, et al.Synthesis and evaluation of epoxy resin self-degradation plugging agent for fractured formation[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：163-168 doi: 10.12358/j.issn.1001-5620.2023.02.003
shu

Synthesis and Evaluation of Epoxy Resin Self-Degradation Plugging Agent for Fractured Formation

doi: 10.12358/j.issn.1001-5620.2023.02.003
  • 1.

    CNOOC China Limited, Hainan Branch, Haikou, Hainan 570311

  • 2.

    School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580

  • Received Date: 2022-10-05
  • Rev Recd Date: 2022-11-20
  • Publish Date: 2023-03-30
    Abstract
  • In view of the technical difficulties in plugging and protecting fractured reservoirs, based on the analysis of the self-degradation mechanism of epoxy resin materials, this paper developed a new type of epoxy resin self-degradation plugging agent, and experimentally explored the influence of the dosage of curing agent and modifier on the performance of the new type of epoxy resin self-degradation plugging agent. With the help of pressure bearing strength experiment, long fracture plugging simulation experiment device, reservoir protection tester, etc., the compressive strength, fracture plugging and reservoir protection performance were systematically tested. The experimental results show that the newly developed epoxy resin self-degradable plugging agent has good degradation performance. The final degradation rate can reach more than 90% at all temperatures, and the degradation rate is more than 95% at 120 ℃ for 96 h. The environmental temperature and pH can promote its degradation; At the same time, the self-degradable plugging agent has a high elastic modulus and a good compression crushing rate, and the compression crushing rate is only 6.2% under 30 MPa. Combined with the particle size grading optimization, the new epoxy resin self-degradable plugging agent can effectively block the cracks between 0.5-4 mm, and has a good crack pressure bearing sealing effect, the result of reservoir protection experiment shows that after 8 days of degradation of self-degradable plugging agent, the core permeability recovery rate reaches 99.1%, and the reservoir protection effect is good.

     

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