CENTRING SKID FOR SAND JET PERFORATOR Russian patent published in 2012 - IPC E21B17/10 E21B43/114 

FIELD: oil and gas production.

SUBSTANCE: centring skid for a sand jet perforator comprises a hollow body, a pusher and fixator levers installed in it on axes as capable of rotation. At the same time in the lower part of the body there is a piston spring-loaded at the bottom, the pusher contacts with the piston and the fixator lever, which represents a double-arm lever. The double arm lever is installed on the axis fixed in the body. One arm of the lever contacting with the pusher has a shaped curvilinear surface, and the second arm has an extended part capable of interaction with a casing string, and the opposite end of this arm - with the side cylindrical surface of the pusher. The pusher is installed in the body via a bushing by means of rubber rings with alternation of fitting along external and internal diameters. Section weakening is arranged in the area of transition between one arm of the lever into the second one.

EFFECT: device finds largest application during opening of beds in wells of complicated shape and horizontal, inclined wells.

1 cl, 2 dwg