http://www.youtube.com/watch?v=n2qA2fXMJ9Y[QUOTE=billslugg;42698]Swell packers are interesting. My guess however is that they are cheap compared to the alternative perforating and pumping. I would like to know how long it takes for “trace” amounts of hydrocarbons to swell the polymer and create the seal.[/QUOTE] "Coastguard hearings from C-Span date 10-4-10http://www.c-spanvideo.org/program/295796-1 http://www.c-spanvideo.org/program/295796-1