Normalization of borehole temperature regime when drilling through permafrost rocks with bottom-hole cleaning by air
Authors:
Abstract
Permafrost is spread on the area of about 49.7% of the USSR territory. Drilling of boreholes in frozen rocks is connected with a number of specific difficulties. Weakly bound loose Quaternary sediments, as well as destroyed bedrock cemented in the frozen state by ice, are very sensitive to violation of their temperature state. When ice thaws, such rocks lose cohesion and stability and may become fluid. Any frozen rocks, including monolithic and stable rocks, are accumulators of huge reserves of cold, which also significantly complicates the processes of conducting wells.
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References
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