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The effect of thermal properties changing (at ice-water transition) on the radius of permafrost thawingстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 декабря 2024 г.
- Авторы: Kutasov I.M., Eppelbaum L.V.
- Журнал: Cold Regions Science and Technology
- Том: 151
- Год издания: 2018
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 156
- Последняя страница: 158
- DOI: 10.1016/j.coldregions.2018.03.018
- Аннотация: Because deep wells in permafrost areas are usually drilled with a warm mud, there is some unknown degree of formation thawing around the wells. For frozen soils, ice serves as a cementing material, and therefore the strength of frozen soils is significantly reduced at the ice-water transition. If the thawing soil cannot withstand the load of overlying layers, in this case a consolidation will take place, and the corresponding settlement can cause significant surface shifts. Thus, for the long term drilling or oil/gas production the radius of thawing should be estimated to predict platform stability and the integrity of the well. It is known that physical properties of formations are drastically changed at thawing-freezing transition. Therefore, for comprehensive interpretation of geophysical logs it is important the knowledge of the radius of thawing and its dynamics during drilling and shut-in periods. Earlier we have shown that for a cylindrical system the position of the phase interface in the Stefan problem can be approximated through two functions: one function determines the position of the melting-temperature isotherm in the problem without phase transitions; and the second function does not depend on a time. For the drilling period we will use this approach to estimate the radius of thawing. For the shut-in period we will utilize an empirical equation based on results of a numerical modeling.
- Добавил в систему: Лев Виленович Эппельбаум