This paper was prepared tor presentatiOn at Offshore Europe 87. Aberdeen. 8-11 September. 1987. Permiss1on to copy is restricted to an abstract of not more than 300words Illustrations may not be cop1ed. The abstract shouldconta1n consp1cuous acknowledgement of where and by whom the paper was presented. Publication elsewhere IS usually granted upon request prov1ded proper cred1l is made
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