FIELD: oil and gas industry.
SUBSTANCE: method is implemented by periodic opening of channel between cavity of tubing string and annular space. Tubing is equipped with valve, located above hole pump above liquid dynamic level, parallel to axis of tubing string, which valve is made in form of cylindrical valve box and shutoff element, made from material with density less than density of pumped oil. Upper part of said box is hydraulically connected to tubing string and bottom, to annular space.
EFFECT: continuous operation of marginal well is provided.
1 cl, 2 dwg
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