7his paper was prepared for pr-ntafw at the 199S SPE ln~mat~nal Swmium W, Formation Oamage Control held In L*X, LwlAan*, 1~1~February 1T his paper was aslwtsd fcf presentation by an SPE Program Commift-follting ravimv M information cantilned in an abstTactsubmM by the atior(s), Contsn16 of the paw, as presented, have nd been r~by the -ety d Petroleum Engin@rs and are subjd to correction by the author(s), The material, as Wwnhd, d-@ nsccssarily reflect any position of the %ety of P*leum Engineers, its officers, or membars. Pa-presented at SPE meetings am subject to publicatii tisw by EdMaf Committees of the Society af Petroleum Ersginesrs. Ekctrunlc reproduction, distribution, or sforcge of any part d this paper for commercial purposes Wout the men consent of the Sociafy of Pstmleum Engim is pmhibfiOd. Permission to rsproducO in print is restriti ta an abstract of ti mom thanw orcs; illustrations may nd be cupied~abstract mu~contain mnspicuous acknowledgment @Mere and by tiom the paper ws presented Write Lrbrarisn, SPE, P.O. %x 833338, Mchardaon,~7WW30, U.S.A., fax 01 -972-952-943S. AbstractA numerical technique based on the finite element method is developed to simulate the process and the ensuing effect of an extreme overbalanced perforating teehuique. The model first considers a point presmre effeet as a resdt of the conventional jet perforating on a selected formation, and secont a time step pressure eff@ on the inner suflace area of the perforation, as a result of the extreme overbalanced process. The extreme overbalanced perforating technique in addition to the petioration tunnel c~ates micro-fractures normal to the perforation tunnels. Although these microfmctures arc not uniform in length and size, they are uniform in orientation and are extended radially and away from the shot center. Most of these micro-fractures, to a profound extend, exceed the crushed zone thickness formed during the jet perforating process. The conductivity of these microfmctures, however, overcomes the effect of cmshed zone in reducing the porosity of the formation and hence productivity of wellbore. Through this simulatio% flow rates are calculated to compare the net production rate of this process to that of a conventional completion~rforating at various formation permeability. The contribution of micro-fractures to flow by the model is presented. Aeeording to the result extreme overbalanced perforating increases the productivity of low permeability formation more than a high permeability formation.

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