DEVICE TO ISOLATE PROBLEMATIC ZONES BY PROFILE PACKER WITH CYLINDRICAL SECTIONS AT WELL DRILLING Russian patent published in 2014 - IPC E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: device includes a profile packer with cylindrical sections and threaded connections, a shoe installed at its lower end with a back valve and a fishing head at the top, an expansion head made of several sections and consisting of a pipe string connection unit at the top and a lock unit from below, which is connected hermetically to the upper end of the profile packer with a fishing tool below for the shoe fishing head. The upper and lower ends of the profile packer are made as a longitudinal corrugated pipe with five and more branches. The lock unit above the profile packer is equipped with a special mandrel, which cone surface and the lower guide has protrusions for an inner surface of branches at the profile packer ends. The guide is made so that it can interact with an inner mandrel in the cylindrical section of the profile packer. The shoe is an assembled unit consisting of an inner insert with a fishing head and a valve placed hermetically in the cylindrical section of the packer lower end and a fixture interacting with the lower butt end of the profile packer and connected to the inner insert.

EFFECT: higher reliability, expanded technological capabilities.

5 dwg