FIELD: oil industry.
SUBSTANCE: invention relates to the oil industry and is intended for the extraction of oil from wells complicated by scaling in downhole pumping equipment. Declared is a downhole rod pumping unit for oil production under conditions complicated by scaling in downhole pumping equipment, containing a plug-in rod downhole pump driven by a drive through a string of sucker rods, a string of production tubing, a liner, a fitting installed in the coupling connection of the liner and branch pipe, a diaphragm valve between the pump and the shank. At the same time, the liner is made of tubing with a diameter greater than the diameter of the production tubing string. Inside the shank, internal pipes are installed coaxially with the shank, plugged with plugs in the lower part. Perforations are made in the upper part of the side surface of the inner pipes. At the same time, the inner pipes and tubing pipes of the liner are interconnected by transfer sleeves.
EFFECT: increasing the efficiency of pump protection against scale buildup.
4 cl, 1 dwg
