SWELLABLE PACKER, SYSTEM AND METHOD FOR USE THEREOF Russian patent published in 2018 - IPC E21B33/12 

FIELD: soil or rock drilling; mining.

SUBSTANCE: group of inventions relates to packers, a method of using a packer in a well, a system used in a well. Packer used in a well comprises a tubular inner core and a swellable longitudinally segmented body mounted to the core and being adapted to swell in the presence of a triggering agent to form an annular seal at an inner surface of the well. Swellable body longitudinally extends between first and second ends of the body and comprises: a first region forming a first segment of a first material located between the first and second ends of the swellable body, to swell at a first rate and into sealing engagement with the inner surface; and a second region forming a second segment of a second material, located closer to each of the first and second ends than the first region, for swelling at a second rate and into sealing engagement with the inner surface and at a rate that is less than the first rate. Swellable body comprises a boundary between the first and second segments, the boundary tapered to tailor an increased surface exposure of one of the first and second segments to the well and triggering agent.

EFFECT: technical result is the suppression of the end effect.

11 cl, 8 dwg