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Development and Performance Evaluation of Novel Solid-Free Epoxy Resin System for Remediation of Sustained Casing Pressure

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  • Ninghui Dou

    (School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
    SINOPEC Research Institute of Petroleum Engineering Co., Ltd., Beijing 102206, China)

  • Zhiyuan Wang

    (School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China)

  • Guangyao Leng

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China)

  • Haoya Liu

    (SINOPEC Research Institute of Petroleum Engineering Co., Ltd., Beijing 102206, China)

  • Zhiqiang Hu

    (SINOPEC Research Institute of Petroleum Engineering Co., Ltd., Beijing 102206, China)

  • Ke Jiang

    (PetroChina Coalbed Methane Company Limited, Beijing 100028, China)

Abstract

Sustained casing pressure (SCP) is a common problem during an entire life span of oil and gas wells. When conventional methods are deployed to resolve the issue, the methods seem to have some setbacks by being unable to seal microcracks in the wellbores. A new solid-free resin sealant was developed by increasing the amount of active hydrogen in the curing agent. This low-temperature cure results in low viscosity, excellent mechanical properties, and chemical stability. The experimental results show that the resin sealant can be used at temperatures ranging from 20 to 50 °C, and the curing time can be controlled within 0.25 to 20 h by increasing the curing agent content. The viscosity of the resin is reduced from 35.7 Pa·s to less than 0.065 Pa·s with the addition of the viscosity reducer, which can greatly promote resin penetration into the microcracks of the cement sheath. After 24 h of curing, the compressive strength can reach 55 Mpa, which is significantly higher than conventional cement. With an increase in the viscosity reducer content from 0% to 25%, the elongation of the sealant demonstrates a remarkable rise, ranging from 1.9% to 18%. The cement with 20% resin caused a significant decrease in permeability by 46.3% as compared to conventional cement. Additionally, the sealing pressure attained an impressive value of 14.7 Mpa. The solid-free resin sealant is miscible with cement slurry, which improves cement tightness, reduces permeability, and improves wellbore annulus sealing ability.

Suggested Citation

  • Ninghui Dou & Zhiyuan Wang & Guangyao Leng & Haoya Liu & Zhiqiang Hu & Ke Jiang, 2023. "Development and Performance Evaluation of Novel Solid-Free Epoxy Resin System for Remediation of Sustained Casing Pressure," Energies, MDPI, vol. 16(6), pages 1-15, March.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2771-:d:1099267
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    References listed on IDEAS

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    1. Abdulaziz Ellafi & Hadi Jabbari, 2021. "Unconventional Well Test Analysis for Assessing Individual Fracture Stages through Post-Treatment Pressure Falloffs: Case Study," Energies, MDPI, vol. 14(20), pages 1-25, October.
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    Cited by:

    1. Ben Qi & Jiawen Fu & Jinfei Sun & Zaoyuan Li & Xin Yang & Fujie Yang & Xuning Wu, 2023. "Numerical Simulation on the Safety and Quality of Cementing by Using Pad Fluid in Horizontal Wells," Energies, MDPI, vol. 16(9), pages 1-15, April.

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