LOCKING SUPPORT OF INSERT BOREHOLE PUMP Russian patent published in 2011 - IPC F04B47/02 

FIELD: engines and pumps.

SUBSTANCE: locking support consists of support coupling (SC) 1 connected to production pipe string (PPS) 2. Cylinder 4 of bottom-hole oil pump is connected through locking element (LE) 5 to housing of seal (HS) 6 of plunger (P) 7. (LE) 5 is equipped with support projection (SP) 8, with conical surface similar to conical surface on conical support projection 3, support coupling (SC) 1. (LE) 5 is equipped with thread 9 on which there installed is seal in the form of cylindrical bushing (CB) 10 with annular outer projection 11. (LE) 5 and (CB) 10 form annular gap (AG) 12 between each other. Between (CB) 10 and inner surface of (SC) 1 there formed is annular gap 13. Erection and operation of locking support of (SC) 1 on (PPS) 2 is lowered to well to the specified depth. On rod string, to axial channel of (PPS) 2 there lowered is insert borehole pump with locking support, prior to introduction to axial channel of (SC) 1 of locking element (LE) 5 with elastic interaction by means of annular projection 11 to inner surface of (SC) 1, with fit of conical surface of (SP) 8 on mating conical surface in support coupling 3. Between outer surface of annular projection 11 and inner surface of (SC) 1 there formed is stressed tight contact owing to which the pump is retained in its place at operation.

EFFECT: higher reliability.

1 dwg