WELL PLUGGING BACK METHOD WITH BRIDGE CREATION, EQUIPMENT FOR EXECUTION AND SLURRY BARRIER Russian patent published in 2009 - IPC E21B33/134 

FIELD: oil-and-gas production.

SUBSTANCE: invention related to underground reservoir, particularly to method of cement bridge construction in a well, with production string installation at the same time. Device includes piping string and connected to it bearing pipe with central pass canal and radial holes. Slurry barrier connected to bearing pipe, consisting from folded material and auxiliary constructions, which perform barrier opening and keep it opened. Barrier executed as void shell with closed around bearing pipe volume. Auxiliary constructions executed as a flexible frame, consisting of multiunit tapes, which cover shell in the barrier shut of position. Also device has centralisers, installed on bearing pipe by the both sides of the barrier. Connected to each other devices forms well production string. For the method execution connect bearing pipe to pipe string, descent the barrier in to the well on a tubing string, which is shut of in correspondence to not cased part of the well, chosen for bridge creation. Pump slurry down though piping string and bearing pipe till shell complete volume filled in, which leads to barrier displacement form shut of to opened position.

EFFECT: increase wells with complicated profile plugging quality, and avoid equipment damage during operation.

8 cl, 7 dwg