DEVICE TO LIQUIDATE COMPOSITE FLEXIBLE STRING STICKING IN WELL Russian patent published in 2008 - IPC E21B29/02 

FIELD: oil production, particularly devices for cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells to eliminate accidents associated with flexible pipes.

SUBSTANCE: device comprises composite body including two parts and container filled with explosive charges and attached to cable. Body parts have telescopically arranged ends connected with each other by means of stop members. Inner string surface has annular groove in area of stop member location. Container has spring-loaded members to be inserted in annular string groove in operative device position. Container is connected to cable so that container may rotate relatively the cable. Container is provided with constant magnets arranged on outer explosive charge ends. In working position stop members are arranged in annular groove and flush with surface thereof.

EFFECT: increased operational efficiency due to decreased waste time.

3 cl, 2 dwg