METHOD OF REPEATED PRODUCING FORMATION EXPOSING AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2009 - IPC E21B43/112 

FIELD: mining.

SUBSTANCE: group of inventions relates to field of boring and operation of wells, particularly to process of repeated producing formation exposing and can be used at construction of wells of different purpose. Method of repeated producing formation exposing consists in implementation of lowering of punching unit into well on string of tubing pipes with following formation in wall of casing pipe of two diametrical slots by means of two rolling disks, transferred in reciprocating direction in the range of specified value of slot in mode of indentation effort increasing of mentioned disks into walls of string by means of successive pressure boos and consumption of circulating flush fluid. Then after expansion of formed through slots up to nominal thickness of rolling disks it is implemented fixation of punching unit in string in mode of flush fluid circulation it is implemented lifting of punching unit upwards at specified axial stretching firmly of rolling disks into top edges of formed slots. After what, with keeping of mentioned value of axial stretching, it is implemented circulation stop of flush fluid, it is implemented changeover of control head from flush fluid pumping to pumping of abrasive fluid and it is implemented erosion damage of behind-the-casing rock by means of feeding of abrasive fluid with specified working pressure in two opposite directed water jet nozzles, oriented in directions of formed perforating slots, implementing translational displacement of punching unit in limits of mentioned slots.

EFFECT: reliability growth of implementation of punching work package and depth growth of perforation ensured by increasing of providing of keeping of circular orientation of punching unit relative to formed punching slots for period of fluid circulation stop, separation during the time of bite of punching slots in string and jet punching of producing formation

3 cl, 4 dwg