s paper waa selected for presentation by an SPE Program CommittW following review of informationcontained in an abstract submined by the W'(a). Contents of the paper, ae preeentad, have not been reviewed by the S@ety of Petroleum Engineem and are subject to correction by the her(e), The material, aS presented, doee not necessarily reflect any poeitionOfthe~lefy OfpetmleUm Engineem, is OMce~, or members. paWw nted et SpE meetings are subject to publication review by Editorial Committees of the SOCieWof petrOleUM Engineem. permi=tin fO cOPYIS ,tricfedto an abstract of not more than s00 words, Illustrationsmay notba copied. The ab~ract shouldcon~in conspicuousacknowledg~nt of where jbywhomthe papr is presented. Write PubficationaManager, SPE, PO. Sox 8S3S36 Richardson, TX 7~sa. Telex, 7~89SpEDAL.

s paper waa selected for presentation by an SPE Program CommittW following review of informationcontained in an abstract submined by the W'(a). Contents of the paper, ae preeentad, have not been reviewed by the S@ety of Petroleum Engineem and are subject to correction by the her(e), The material, aS presented, doee not necessarily reflect any poeitionOfthe~lefy OfpetmleUm Engineem, is OMce~, or members. paWw nted et SpE meetings are subject to publication review by Editorial Committees of the SOCieWof petrOleUM Engineem. permi=tin fO cOPYIS ,tricfedto an abstract of not more than s00 words, Illustrationsmay notba copied. The ab~ract shouldcon~in conspicuousacknowledg~nt of where jbywhomthe papr is presented. Write PubficationaManager, SPE, PO. Sox 8S3S36 Richardson, TX 7~sa. Telex, 7~89SpEDAL.