CENTRALISER FOR HYDRAULIC SANDBLAST PERFORATOR Russian patent published in 2014 - IPC E21B17/10 

FIELD: process engineering.

SUBSTANCE: invention relates to oil-and-gas production, particularly, to perforator retainers. Centraliser for this perforator comprises hollow case accommodating pusher interacting with spring-loaded piston arranged there under and fitted in barrel and retaining levers fitted on said piston to turn thereabout. Barrel top part has groove to accommodate thrust ring fitted therein to displace in lengthwise direction to interact with retaining levers by its top part and to rest on resilient ring by resilient ring. Piston top part has cut-outs for fitting retaining levers therein. Every cut-out represents two inner parallel surfaces with coaxial holes. Every hole has cut-out. One end of retaining lever has symmetric stiff cylindrical elements with flats arranged in diametral opposition. Piston hole cut-out chord length corresponds to spacing between said flats, piston hole diameter corresponds to diameter of cylindrical retaining lever element while opposite end of retaining lever end can interact with caring pipe.

EFFECT: higher efficiency.

3 cl, 6 dwg