To: Douglas V. Fant who wrote (70853 ) 8/14/2000 12:21:51 AM From: isopatch Respond to of 95453 "I picked up Fred's full set of slides/handout. It's at work so remind me tomorrow to post it and I'll detail the discoveries, technology, and drilling techniques." Please do Doug. I'd also be very interested in this information. Maybe there are some ideas we can use in the prospects we've been piecing together from small adjacent lease tracts since early Feb. In Illinois, even when you are drilling into a virgin pool, you tend to encounter naturally low pressure reservoirs. This is true of both sandstones and carbonates. Geoscientists have a variety of explanations for the low pressures in our reservoirs as well as those in some in other basins in the lower 48. Low permiability only accounts for part of it. One geologist told me earlier this year he believes characteristics of the formation water are the principal source of these relatively low pressures. Personally I don't know why. But we have to design our drilling and completion programs with this and other important factors clearly in mind. For example, many good producers during the past 60 years DST in the geologically quirky Aux Vases at pressures of 400 to 650 psi. Oolitic limestone pays in the O'Hara, Rosiclare test only marginally higher. Above 750-800 psi, even in those limes, and you almost always into water - big time! A friend who's an offshore coordinator for Chevron on the La. Gulf is accustomed to GOM hi perm pays with a loosely consolidated rock matrix. So pressures and IP rates are tremendous. But in 3-4 years, he tells me, they are pumping 97% salt water! Talk about depletion? Geez! Anyhow, showed him some representative Illinois DSTs and completions when he was here in Feb, and he found it hard to believe I wasn't showing him readings from depleted reservoirs. So, considering the challenges we are dealing with, there is a good deal of interest in underbalanced drilling and completions. "Dry perfing" the pay has been used with a good deal of success because without fluid in the hole there is a more immediate and stronger flow back from the formation to clean out the perfs. In zones known for clay swelling in the presence of fresh muds, some operators rotary drill to just above the top of the pay, then finish with a spudder. Such inexpensive new ways of applying old tools and techniques are practical and popular. Look forward to your post. Hope there are some things I can look into. Whether it's the market or planning a project am always looking for an edge. TIA. Isopatch