INSERTABLE ANNULAR BENCH OF CASING PIPE OF WELL AND DEVICE FOR ITS DELIVERY AND INSTALLATION IN CASING PIPE Russian patent published in 2009 - IPC E21B7/08 E21B23/00 

FIELD: mining engineering.

SUBSTANCE: group of inventions relate to mining industry, particularly to technology and engineering of construction and operation of multidirectional wells. It includes insertable annular bench and device for delivery and installation of annular bench. Annular bench is implemented from one or more co-axial connected to each other into set of thin-walled bushes. Each bush is implemented from spring steel with longitudinal for full height cut and with incisions on external surface. Device for delivery corresponds top and bottom reducing taper elbows, connected to each other by rod, between which it is installed flexible hydraulic chamber. Bushes, tie up by strip belts, are located in device of delivery of and lowered to the place of bench installation, after what hydraulic pressure is supplied, from which at expansion of flexible hydraulic chamber strip belts are destroyed, and bushes are impacted to inner surface of casing pipe, forming united bench. After pressure relief device of delivery is returned to the surface. It provides azimuthally-oriented fit in casing pipe of previously drilled well of bench for installation and orientation on it of manufacturing equipment, requiring ejection to bottom.

EFFECT: it provides regulation of bench weight-carrying ability, allowing pass of maximum possible diametre in bench without additional operations that provides well's operation lower the bench.

4 cl, 8 dwg