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

Ninghui Dou, Zhiyuan Wang (), Guangyao Leng, Haoya Liu, Zhiqiang Hu and Ke Jiang
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Ninghui Dou: School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, 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

Energies, 2023, vol. 16, issue 6, 1-15

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.

Keywords: curing agent; viscosity reducer; compressive strength; solid-free resin; break elongation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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