Influence of Thermal Cycling on Cement Sheath Integrity in Permafrost Conditions
- سال انتشار: 1405
- محل انتشار: ماهنامه بین المللی مهندسی، دوره: 39، شماره: 1
- کد COI اختصاصی: JR_IJE-39-1_012
- زبان مقاله: انگلیسی
- تعداد مشاهده: 54
نویسندگان
Department of Wells Drilling, Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia
Department of Wells Drilling, Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia
Department of Automation of Technological Processes and Production, Faculty of Mineral Processing, Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia
Scientific Center “Arctic”, Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia
Scientific Center “Arctic”, Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia
چکیده
Cementing wellbore intervals in permafrost environments presents significant challenges due to cyclic freeze-thaw conditions, which induce microstructural degradation in the cement sheath, compromising zonal isolation and long-term well integrity. While existing studies have addressed thermal effects on cement properties, the interplay between alternating temperatures, unhydrated fluid behavior, and stress evolution in the pore space remains poorly understood. This study introduces an integrated methodology to systematically investigate the impact of cyclic thermal loads on cement sheath microstructure and mechanical performance under simulated permafrost conditions. A combination of advanced laboratory techniques – including X-ray microtomography, strain gauge monitoring, and controlled thermal cycling – was employed to analyze pore redistribution, microcrack propagation, and stress dynamics. Key findings reveal that unhydrated mixing fluid, trapped in the pore space, undergoes phase transitions during freeze-thaw cycles, generating internal stresses that exceed the cement’s tensile strength, leading to irreversible structural damage. To mitigate these effects, we proposed the use of a synthetic polyacrylamide-based polymer (PAM) as a multifunctional additive. Experimental results demonstrate that PAM reduces fluid loss by ۵۴.۷۶%, enhances compressive strength by ۲۰%, and maintains Young’s modulus (۱۳.۱ GPa) after three freeze-thaw cycles. These improvements can be attributed to PAM’s ability to delay fluid loss, redistribute pore stress, and stabilize the cement matrix through enhanced coagulation and gelation mechanisms. The study’s scientific contribution lies in its holistic framework for evaluating cement degradation mechanisms in permafrost, coupled with actionable solutions for optimizing slurry design. This work advances the practical application of polymer-modified cements in Arctic well construction, offering a pathway to improve durability and reduce environmental risks in extreme cold environments.کلیدواژه ها
Permafrost, Well Cementing, Temperature cycle, stress-strain stateاطلاعات بیشتر در مورد COI
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