RE-ACTIVATION OF WELL Russian patent published in 2009 - IPC E21B43/00 

FIELD: mining.

SUBSTANCE: method consists in disassembling plugs from sleeves of production tree, in assembling operations on hand wheels gates, in checking on pressure in production tree and borehole, in replacing old process solution to fresh one, in carrying out sweeping-up of operational column of well borehole by means of lowering string column with gage into well to specify its tightness, and further in verification of location and hardness of cement bridge by means of unloading with boring column onto cement bridge. Also apertures are cut in a production column above the cement bridge installed in the well during conservation; and a side borehole is drilled up to a producing formation under condition that this formation is to be opened up beyond the boundaries of mudded bottomhole zone at a removed from the well borehole distance. The side borehole is cased with a new operational column above the roof of the producing formation, and is cemented, a tail-filter is lowered into it and hung in the new operational column; after that opening-up the producing formation is repeated and communication between the producing formation and a well head is restored.

EFFECT: there is provided activation of inflow from formation due to overcoming mudded bottomhole zone of formation by means of drilling side borehole and opening producing formation with it at a significant distance from old borehole of well and from mudded bottomhole zone of formation.

1 dwg