ANALYSIS AND JUSTIFICATION OF SELECTING CLEANING AGENTS AND TECHNOLOGY OF THEIR APPLICATION IN PERMAFROST WELL DRILLING

Abstract


The study is focused on improving efficiency of well cleanout in permafrost conditions using cleaning agents of low thermal conductivity. At present drilling in hard conditions, e.g. abnormal reservoir pressures (low or high), unstable rock, rock of higher hardness, permafrosts and so on, gains momentum. Permafrost areas are common in Russia, covering 10 million km2 in different regions and thus totaling more than 50 % of the whole territory of Russia. Large parts of Alaska (USA) and Canada also contain permafrost. A big number of oil and gas fields are located in these areas; that is why developing technologies of well drilling in hard conditions draws much attention. In doing so a depth of permafrost can reach 1400 m (for instance, the Markhinskaya well in the northwestern part of Yakutia) but usually it is 600-700 m. The permafrost temperature can make -8 °C though it mainly fluctuates between 0 and -2,5 °С. The paper offers the analysis of the Russian and foreign experience related to well drilling including cleanout by different agents and technologies of their cooling. The Russian practice based on traditional technologies tells us that defrosting, destruction of permafrost leads to a number of complications, particularly in the wellhead area resulting in poor well performance. The cleaning agents investigated include cooled air, gas-liquid disperse systems and flushing fluids.


About the authors

A. A Iakovlev

National Mineral Resources University (University of Mines)

Author for correspondence.
Email: andre_a_yakovlev@mail.ru

M. V Turitsyna

National Mineral Resources University (University of Mines)

Email: turitsyna_maria@mail.ru

E. V Mogil'nikov

LLC “SGC Drilling”

Email: evgeny.mogilnikov@mail.ru

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Copyright (c) 2014 Iakovlev A.A., Turitsyna M.V., Mogil'nikov E.V.

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