HYDRAULIC PROBING PERFORATOR Russian patent published in 2015 - IPC E21B43/114 

FIELD: process engineering.

SUBSTANCE: invention relates to oil production and serves to make deep perforated channels in productive bed. Perforator comprises split case with rotary guide channel connected with hydraulic cylinder provided with brake piston, probe with adapter and its regulator composed of casing with stepped bore to house spring-loaded slide valve with ring piston at outer surface. End valve at lower end makes with said case a circular chamber engaged via drain channel with hydraulic cylinder piston head chamber. The latter communicates via bypass channel with throttle with cavity above ring piston of stepped slide valve. Brake piston is provided with hollow rod with nut in axial channel extending into split case axial channel. Said probe is provided with retainer at upper end extending in hollow rod axial channel to make a sliding joint with the nut. Hydraulic cylinder piston head chamber is continuously communicated by bypass bores with hollow rod axial channel. Stepped slide valve body has circular bore and incorporates hollow link with skew at end to make top end extend beyond said steeped slide valve. Said case has limiter with ball valve spring-loaded seat arranged above said stepped slide valve to allow interaction between ball wall with hollow rod end, inner circular ledge with seat on inner surface and spring-loaded retainer fitted to interact with lock ring bore at hollow rod at initial position. Circular bore in stepped slide vale is communicated via bypass bores with circular chamber composed of the case and end valve body. Limiter seat has lengthwise grooves at outer side to make a sliding joint with stepped slide valve top end. Circular channel is composed between case circular ledge and hollow rod with lock ring to communicate with hydraulic cylinder piston head chamber.

EFFECT: possibility to return said probe to initial position.

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