PROCEDURE FOR REPAIR OF ANNULUS SPACE OF STRING BOREHOLE WITH TWO EXPOSED FORMATIONS Russian patent published in 2010 - IPC E21B33/13 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in lowering running packer on pipe string. The packer is equipped with a nipple with side openings and with a plug fixed from below, nipple performs lengthwise travels in a lengthwise opening of the packer. Upon packer seating between two exposed formations, a protective composition is pumped into an upper formation at an isolated wellhead through side openings of the nipple. The pipe string is lowered so, that side openings of the nipple are positioned below the packer. A blocking composition is pressurised into the lower formation, whereupon there is pumped insulating material creating excess pressure. After forcing insulating material through into annulus space the pipe string with the nipple is lifted till the plug is fixed in a through channel of the packer. Excesses of insulating material are washed off in above-the packer space. The pipe string is extracted from the well. The packer is drilled out upon insulating material setting.

EFFECT: maintaining collector properties of formation after repair due to prevention of mudding with solid grouting mortar; saving time of insulating operations and increasing their reliability.

2 cl, 1 dwg