MECHANISM FOR MECHANICAL-HYDRAULIC PERFORATOR INSTALLATION AND RETAINING INSIDE WELL Russian patent published in 2007 - IPC E21B43/112 

FIELD: oil production, particularly Perforators with extendable perforating members.

SUBSTANCE: perforator installation and fixation mechanism comprises perforation unit 1 made as body 5 with curvilinear director 6 adapted to receive flexible shaft with cutting tool. Installed under perforation unit is mechanical-hydraulic anchor 4 including body and slips. Mechanism additionally comprises pressing unit 2, which presses perforation unit to well wall. Perforation unit body wall facing pressing unit is beveled. Pressing unit comprises pivotally arranged support member with thrust anvils and has beveled surface facing perforation unit body so that beveled pressing unit surface corresponds to that of perforation unit body. Perforation unit body and support member of pressing unit may cooperate with each other along beveled surfaces and perform limited mutual sliding in radial direction. Mechanical-hydraulic anchor is made as hydraulic cylinder with piston arranged in the body. Support member and return springs are secured to upper end of mechanical-hydraulic anchor. The return springs urge the support member in transport position. Longitudinal channels are created in perforation unit body, in support member and in mechanical-hydraulic anchor so that the channels are communicated with each other and define path for working liquid delivery into underside cavity of anchor hydraulic cylinder.

EFFECT: increased efficiency.

3 cl, 3 dwg