DEVICE FOR PRESSURIZATION OF TORN COLUMN IN A WELL (VARIANTS) Russian patent published in 2004 - IPC

FIELD: underground well maintenance.

SUBSTANCE: device has tail piece provided with sub in upper portion with thread for removing tool during raising from well. Tail piece is made consisting of upper and lower portions, between which fixing elements in form of spring plates are placed, on external surface thereof flat fixers are placed, made with possible support against upper end of lower portion of torn column. Lower portion of tail piece is made with slant, while height of fixers is greater than space between column pipes, connected by sleeves. According to second variant, tail piece is made perforated and with ring recess placed in its center, in which fixers are placed in form of spring-loaded plates, made with possible support against upper end of lower portion of torn column. Lower portion of tail piece is made with slant. Height of fixers is greater than space between column pipes, connected by sleeves. According to third variant, upper and lower portion of tail piece are connected by inner bushing with forming of ring space. Tail piece is provided with fixer on its outer surface in ring recess, in form of T-shaped cross-section stopping spring ring, with possible support against upper end of lower portion of torn column. Height of fixer is greater than space between column pipes, connected by sleeves.

EFFECT: higher reliability.

3 cl, 7 dwg