This paper was prepared for presenlat!cf! al the Offshore TechnolwY Ccmference fwld In Ho.mton TeXSS, 6-9 !.ay 1W Thm paF%r was selected for presentat wn by the OTC Prcgram Committee following revmw' of !nformatum contained In an abstract subintted by the autfwr(s) Contents of the paper as presenled, have not bean rev!ewed by the Offshole Technology and are subject to CorrectIon by the author(s) The material, as presented, does not nec.nssarIIY raflacf any posmon of the Offshore Technology Conference or Its offcers Permlssoon to copy IS restmted 10 an abstract of not more than X30 words Ii!ustratmns may not ba ccpedThe absfract should Wntaln conspicuous acknowfedgemenl of where and by whom the pap+r was pW3antfKf