Designing problems of oil fields infrustructre in the Arctic under the climate change

Background. Designing problems of oil fields infrastructure in the Arctic under climate change, namely, applying of temperature coefficient when calculating bearing capacity, heaving of lightly loaded foundations, optimization of thermal stabilization solutions are presented in the article. Aim. To change the strategy for designing foundations on permafrost by choosing the worst soil conditions to the implementation of an invariant matrix for designing and construction of soil bases and foundations considering specifics of industrial facilities of oil and gas fields based on unified numerical calculations (regulations). Materials and methods. An overview of the current regulatory requirements to the design of foundations on permafrost is made. The analysis of forecast modeling of the temperature of soil bases of typical industrial facilities of oil and gas fields to justify design solutions and also the use of thermal stabilization systems is done. Results. It is proposed to develop a regional directory of weather stations with long observation period based on updated climate data to decrease the volume of designing work and the amount of mistakes in applying of thermal stabilization systems. It is necessary to create regional dynamic models of permafrost geosystems, implement forecast modeling of seasonal thawing potential depth and frozen ground temperature in natural landscapes on the base of geotechnical monitoring data and select adaptation methods to existing or expecting climate change trends. Conclusions. Regulations on designing and construction of soil bases and foundations on permafrost considering specifics of industrial facilities of oil and gas fields is an effective solution. It allows moving on the strategy implementation of uniform approaches to oil fields development on permafrost: from designing for every structure on the base of typical solutions and results of engineering surveys to invariant matrix of project solutions.

permafrost, forecast modeling, soil base temperature regime, frost heaving, composite piles

1. Hjort J., Karjalainen O., Aalto J., Luoto M., Westermann S., Etzelmüller B., Romanovsky V.E., Nelson F.E.. Degrading permafrost puts Arctic infrastructure at risk by mid-century. Nature Communications. 2018, vol. 9, no. 1, p. 5147.

2. Стрелецкий Д.А., Шикломанов Н.И., Гребенец В.И. Изменение несущей способности мерзлых грунтов в связи с потеплением климата на севере Западной Сибири // Криосфера Земли. — 2012. — Т. 16. — №1. — С. 22–32.

3. Курчатова А.Н., Посконина Е.А. Моделирование теплового взаимодействия песчаной насыпи и мерзлых грунтов основания // Основания, фундаменты и механика грунтов. — 2018. — №4. — С. 28–32.

4. Посконина Е.А., Курчатова А.Н. Стабилизация температурного режима грунтов оснований путем применения прослойки из Теплонита в теле насыпи // Наука и техника в газовой промышленности. — 2019. — №1. — С. 13–19.

5. Посконина Е.А., Курчатова А.Н. Определение минимальной длины термокейса при выбранном расстоянии между скважинами // PROНЕФТЬ. Профессионально о нефти. — 2019. — №2. — С. 66–70.

6. Посконина Е.А., Курчатова А.Н. Оптимизация решений по термостабилизации грунтов оснований // Известия вузов. Нефть и Газ. — 2020. — №2. — С. 49–59.