WELL SUCKER ROD PUMP Russian patent published in 1999 - IPC

FIELD: oil producing industry; pumping out liquids containing mechanical admixtures at gum and paraffin deposits. SUBSTANCE: pump filter has spring centralizers installed on end sections of perforated cylinder. Space of cylindrical reservoir is hydraulic communicated with string borehole annulus through holes made in its upper part. Sludge receiver is arranged on lower end face of cylindrical reservoir. Sludge receiver is made in form of truncated cone whose larger base corresponds to diameter of spring centralizers, and smaller base is mated with cylindrical reservoir. EFFECT: enhanced reliability and efficiency in operation owing to prevention of getting of gun and paraffin deposits to intake and overlapping of filter holes by wall of string. 1 dwg