TELESCOPIC CONNECTION FOR COMPENSATING THERMOBARIC ALTERATIONS OF LENGTH OF COLUMN OF PIPES IN A WELL Russian patent published in 2007 - IPC E21B17/00 E21B17/07 

FIELD: well equipment, possible use during extraction of fluid or forcing of working agent into well with one or several beds.

SUBSTANCE: connection includes body and shaft built into it, interconnected by telescopic drive, sealing packer, stopper in form of cams and a shell. Body is made of several standard pipes, interconnected by sleeves. Positioned in one of them is stopper for rigid connection of body to shaft. Shaft has radial grooves for positioning of stopper and threaded radial apertures, wherein shear screws are mounted for holding in shell shaft. Shell is made with external grooves, in one of which packing ring is positioned, and in other one - shear screws. Shell is mounted in shaft with possible downward movement and has internal planting channel for its downward movement by hydraulic action by means of cable reverse valve or mechanical effect by means of impact tool, external supporting surface for stopper for rigid holding in original position of shaft and body, and external recess for positioning of stopper after its downward movement. Body has internal supporting clamp. Shaft is made with external stopping and internal stopping clamps.

EFFECT: simplified construction, manufacturing technology and, appropriately, lower costs and also increased reliability and efficiency of operation.

12 cl, 8 dwg