METHOD OF PREPARATION OF GAS WELL TO DEWATERING Russian patent published in 2015 - IPC E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: according to the method on the wellhead the blowout equipment is installed. Then through it on the sleeveless long-length pipe into the tubing string the plug packer is lowered which is made of soluble material and fitted with mounting arrangement. The displacement fluid is injected into the tubing string which pressurises the plug packer pressurise thus sealing the tube side of the tubing string. Into the tubing string the non-flammable gas is injected to displace the displacement fluid from this string. The sleeveless long-length pipe is lifted to the surface together with the mounting arrangement. Into the tubing string down to the plug packer on the sleeveless long-length pipe the tail pipe consisting of the tail pipe suspension with disconnector and the pipe string the diameter of which is less than internal diameter of the tubing string. Then the solvent is pumped into the tubing string. After dissolution of the plug packer the tail pipe is lowered to the necessary depth. Into the sleeveless long-length pipe the displacement plug or sphere is lowered and the displacement fluid is supplied until sitting of the displacement plug or sphere into sitting assembly of the tail pipe suspension. Then by pumping of additional portions of displacement fluid the executive mechanisms of tail pipe suspension bracket and disconnector are put in motion. After that on the sleeveless long-length pipe the disconnector together with the displacement stopper or sphere are lifted from the well. The blowout equipment is dismantled and the well is started-up.

EFFECT: ensuring safe operation of wells.

4 dwg