TWO-DISC SLOTTED HYDRO MECHANICAL PERFORATOR Russian patent published in 2015 - IPC E21B43/112 

FIELD: process engineering.

SUBSTANCE: invention relates to secondary exposure of beds by creating of lengthwise slots in casing (operating) strings and filtering channels in bottom hole formation zone. Perforator comprises hollow case with piston at its top part and lengthwise opening at case bottom part. Rocker is fitted in said opening with axle arranged across said case. Two form discs are arranged at rocker opposite ends. Rocker drive with form discs is composed by a wedge-type pusher. Two jet nozzles are communicated via channels with the case head ends. Ball seat is arranged in the rod central bore while the spring makes the rocker return mechanism. One of said nozzles is arranged directly above lower form disc and connected with the rod inner chamber via closed channel made in the case. Wedge-type pusher is secured to the rod by clip via thrust. Ball arranged inside the rod is locked by pin. Inserts are fitted at the case and hydraulic cylinder ends to allow the device sliding and centring in the string.

EFFECT: higher efficiency and reliability.

1 dwg