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Gold/Mining/Energy : Tusk Energy (TKE) -- Ignore unavailable to you. Want to Upgrade?

To: viper who wrote (599)	6/15/1998 6:01:00 PM
From: grayhairs	Read Replies (1) \| Respond to of 1207

viper, What I am saying is that I can not tell you what multiple would be appropriate. (the range of my expectations would be 0 to 500 !!!) If the productive zone is comprised of only intergranular porosity, and if the zone is perforated throughout with deep penetrating perfs and only a minimal "skin", then a 5 fold increase in production rate MAY be a reasonable expectation. BUT, if the productive zone includes some vugular porosity, or if the zone is fractured, then the increase in productivity after acidizing can be very, very dramatic (Eg. 500 fold increase!!). Why?? Because drilling mud used in the drilling activity and cement from the casing operation will have entered the highly permeable vugular and fracture porosity near the wellbore and plugged it off. So, when the well was perforated only the "poorer" intergranular porosity and permeability can initially contribute to the flow rate. (The best porosity has all been plugged off!!) The acid job is required to "clean up" the better quality natural porosity and to create some secondary/new porosity and permeability near the wellbore. If the first acid job improves productivity, Apache may even decide to do a second much larger acid stimulation. This too would normally be done before a lengthy 4 point flow test so .... Patience is an acquired virtue!!!! Later, grayhairs P.S.-- Did you pick up anything "on special" today??