| 摘要 |
The invention relates to A system (10) for improving zonal isolation in a well in a subterranean formation, comprising: a tubular (1) having a outer surface (11); and a swellable coating (2) coating the outer surface (11) of said tubular (1), said swellable coating (2) having an external surface (21); and/or a composition? (20) provided in an annular space outside said tubular (1). According to the invention the swellable coating (2) is made of a first swellable material (3) able to swell in contact with a first fluid (6) on said external surface (21) and/or the composition (20) is made of a second swellable material (4) able to swell in contact with a second fluid (7), and wherein said first (3) and/or said second (4) swellable materials include an elastomer compounded with an aqueous polymer inverse emulsion of particles of a polymer comprising a betaine group, said elastomer being able to swell in contact with hydrocarbon and saline aqueous fluids. The invention applies, in particular, in the oil and gas industry. |
