FIELD: oil and gas industry.
SUBSTANCE: at implementation of the method, cutter advancing devices are connected to a cutter; a pressure drop is created between the above cutter advancing device and the above cutter; with that, the above pressure drop causes descending movement of the above cutter advancing device and the above cutter and engagement of the above cutter at least with some part of the above cased well shaft is provided.
EFFECT: improving efficiency of an opening cutting process due to control of a load applied to a cutter.
23 cl, 3 dwg
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