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Article

Systematic Experimental Investigation on In-Situ Self-Adaptive Sealing Property of Composite Pressure-Activated Sealant for Curing Minor Tubular Leaks

1
School of Petroleum Engineering & Environment, Zhejiang Ocean Univerisity, Zhoushan 316022, China
2
Unconventional Oil and Gas Science and Technology Research Institute, China University of Petroleum (Beijing), Beijing 102249, China
3
Institute of Exploration Techniques, CAGS, Langfang 065000, China
4
Beijing Research Center of CNOOC (China) Co., Ltd., Beijing 100027, China
5
Hubei Collaborative Innovation Center for Unconventional Oil and Gas, College of Petroleum Engineering, Yangtze University, Wuhan 430100, China
6
School of Chemistry and Chemical Engineering, Queen’s University Belfast, Belfast BT95AG, UK
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(21), 5597; https://doi.org/10.3390/en13215597
Received: 22 September 2020 / Revised: 24 October 2020 / Accepted: 26 October 2020 / Published: 26 October 2020
(This article belongs to the Special Issue Advances in Drilling Fluid Technology)
Curing minor leaks and restoring the integrity of a wellbore in a safe and economical way is always challenging in oil and gas production. In this work, a composite pressure-activated sealant, combined with liquid and solid sealing materials, was prepared via the demulsification approach. The structure, morphology, and size distribution of key particulates in the sealant were examined, and the in-situ self-adaptive sealing property was examined with a specially design dynamic sealing detector. The results indicated that the pressure-activated sealant was a multi-dispersed phase system, and the dispersed colloid particles were regular in shape and had a narrow size distribution of 300–400 μm. The solid sealing materials were introduced to construct a composite pressure-activated sealant, and the sealing capability can be markedly reinforced by cooperativity of liquid and solid sealing materials. A mechanochemical coupling model was put forward to rationalize the dynamic sealing process. Finally, such sealant system was employed in a certain offshore gas well with sustained casing pressure to verify its applicability in minor defect repairs. View Full-Text
Keywords: composite pressure-activated sealant; minor leak repair; self-adaptive sealing property; liquid-solid jamming transition; cooperative sealing effect composite pressure-activated sealant; minor leak repair; self-adaptive sealing property; liquid-solid jamming transition; cooperative sealing effect
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MDPI and ACS Style

Xu, L.; Huang, X.; Huang, X.; Xu, J.; Xing, X.; Xu, M.; Ma, C.; Huang, M. Systematic Experimental Investigation on In-Situ Self-Adaptive Sealing Property of Composite Pressure-Activated Sealant for Curing Minor Tubular Leaks. Energies 2020, 13, 5597. https://doi.org/10.3390/en13215597

AMA Style

Xu L, Huang X, Huang X, Xu J, Xing X, Xu M, Ma C, Huang M. Systematic Experimental Investigation on In-Situ Self-Adaptive Sealing Property of Composite Pressure-Activated Sealant for Curing Minor Tubular Leaks. Energies. 2020; 13(21):5597. https://doi.org/10.3390/en13215597

Chicago/Turabian Style

Xu, Lin, Xiaohe Huang, Xin Huang, Jie Xu, Xijin Xing, Mingbiao Xu, Chao Ma, and Meilan Huang. 2020. "Systematic Experimental Investigation on In-Situ Self-Adaptive Sealing Property of Composite Pressure-Activated Sealant for Curing Minor Tubular Leaks" Energies 13, no. 21: 5597. https://doi.org/10.3390/en13215597

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