METHOD OF ENTERING PRODUCTIVE FORMATIONS FROM WELLS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2012 - IPC E21B43/11 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry and can be used at entering the productive formations from wells reinforced by well tubing that are and were in operation. Method includes drilling of perforating channels in the wall of well tubing and annular space with the aid of a bore that is delivered to well tubing wall by bore supply unit through surface pipe. Bore build up is done after each deepening by the length of its rod that is automatically supplied from the loader by rod of the same length. Disconnection of bore supply unit from the composite rod left in perforated channel is done after reaching the specified depth of the channel. In the course of perforating channel formation the bore and composite rod are kept from moving in transverse direction inside the surface pipe rotating together with the bore and composite rod. The surface pipe and composite rod inside the surface pipe are fixed to prevent rotation in the moment of bore build up.

EFFECT: increase of reliability of productive formation entering irrespectively of getting into drilling zone of previously created channels, also presence of cavities and less dense areas in annular space.

6 cl, 6 dwg