... вращения ротора. Lately almost universally complicated drilling conditions. Increased drilling depth, started to drill horizontal wells with a large deviation from the vertical.Today an increasingly important role played by the total weight of the drill string, depending on the weight increase of the friction force, more effort and stress-strain state of the column. For deep, ultra-deep drilling and horizontal drilling pipes of aluminum alloys have an advantage over steel - the weightof the ...

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