This paper w u p n p a r d fa pr.rentstlon at the 1997 Offahore Technology Conference held in Houston, Texu. 5-3 May 1887.Thi8 paper w u a~I.lct.d for preamtstlon by the OTC PrOpnm Committee followlng r e v h of inlormation contPlnd In M abstnct submHtd by the author(s). Contents of the psper as prs8ented, ham not bobn &owed by the Offshore Technology Conference and are subject to correction by the author(8). The materiel, as presented, does not necessarily reflect any pos~tion of the Offshore Technology Conference or Its offlcen. Electronic reproduc(1on. distnbuh, or stomp ct m y psrc of this paper lor commerclsl purposes wkhout the written consent of the Omhore Tachnology Conference Is pmhibited. Permission to reproduce In pnnt 1s reslncted to m abstrect of not more than 300 w d s ; illustrations may not be copied. The abstracl must mnteln conspicuous acknowledgment ot where and by whom the paper was presented.
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