FIELD: engines and pumps, oil-and-gas production.
SUBSTANCE: invention relates to oil-and-gas production, namely to downhole pumping units. Proposed unit comprises bucket rods and pipes with threaded upsets. Note here that, to reduce the weight of bucket rod and pipe strings, on the outside of the latter bottles are fitted that incorporate 70 to 550 mm-dia.outer pipe and plugs filled with, for example, gaseous nitrogen or inert gas at 0.0001 to 188.4 MPa.
EFFECT: higher efficiency of plunger pumps, safe operation of pumps and pumps units.
6 dwg
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