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In nature simultaneous manifestation of several processes takes place: diffusion and filtration of hydrocarbons, their emergence, overflows along tectonic fractures, etc. Other things being equal, the dispersion of gas accumulations occurs much faster than oil accumulation, due to greater mobility (migration ability) gases, better solubility in water, higher diffusion capacity, etc. All these natural processes that can lead to the redistribution or destruction of oil and gas accumulations take place mainly over a ...

Drilling in permafrost is accompanied by a risk of specific complications related to the disturbance of temperature conditions. The risk imposes certain restrictions on the use mud motors, depths of installation of conductor pipe and surface casing, temperature of the circulation fluid, timing of cement curing etc. This article discusses a technology of additional reaming and reciprocating the wellbore just before running casing, which is based on the properties of cryogenic rocks. Conducted an analysis of technic...