DEVICE FOR OIL RECOVERY AND TREATMENT OF BOTTOM- HOLE Russian patent published in 2000 - IPC

FIELD: oil producing industry; applicable in oil recovery with concurrent treatment of bottom-hole zone. SUBSTANCE: device cylindrical body in its upper part, at level of inlet holes, has internal groove whose width is not less than diameter of inlet holes. Body is provided on its outside, at level of inlet holes, with filter fixed by means of clamp in form pressing member and collet consisting of a set of wedges. Internal surface of wedges is knurled and corresponds to outer diameter of cylindrical body. External surface of wedges is made conical and in correspondence to internal surface of pressing member. Installed in body is reciprocating plunger with valve. EFFECT: higher reliability of downhole pumping equipment, and improved effect of cleaning of bottom-hole zone. 2 dwg