This paper wee eelaotedfor praeentafkmby an SPE ProgramCommitteefollowi~review of information mntained in an abstractsubmittedby the author(s).Oontenteof the paper, ae presented,have not been reviewedby the Sodety of PatroieumEngineersand are subjectto corraotionby the author(a). The material,ee presented,does not necaaaarifyreflect any Poaitii orthe SOOiaty of PetrolaumEngineers,iteoffiira, or mambara.Paw prmm~at SpE rnaatinEawe aubj-to p@lkatlon r~~w by Editorial comm~ees of the *i* of PetrofaumEngineers. Parmbebntocopyiareetriied toan ebatractofnotrnwathenWI) words.Illuatreticma maynotbe copied.The slwtraotahouidcontainmnapicuoua acknowledgment of where and by whomthe paper is praaanted.Wrhe Ubrariam SpE, p.o. sox s33S3S. Richati=n, TX 7~'-3333, U.S.A. Te~x, 1""5 SpEUT. Abstract

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