This paper was adecfed bf pmwnatbn by an SPE Program CommilbeMowing rewiw of intormafii contained In an abafracf 8ubmHfed by the author(s). Contenm of the paper, as presented, have ml taen reviewed by lfw SOcbly of Pelrobum Enginearn and are subjecf to oarreclbn by the author(s). The nwwbd, nY pmsemted, do6a not necewrily Ntbcf any podtii of the SocbIY of Pefrofeum Engineers, W officam, w mentws. POP6M wewnfed at SPE meetirw am 8@cf to publfcatbn revisw by Edbbl Cammlffwa of the society d~~-. Pwmiwbnmqb~mm*M&~wW~tis.lll_tiw Mb~.~ti_*Mtin~wkõ f where and by whom the M b presented. Write Librarian, SPE, P.O. Sox 8S38SS, Rbfwdson, TX 75wHSSE, U.S.A., Tefex 16324S SPEUT.