Lessons Learned from Cased-Hole Formation Evaluation Along Unconventional Horizontal Wells

摘要: ABSTRACT Revolutionary development of unconventional resources for the last two decades has been largely enabled by horizontal drilling and multistage hydraulic fracturing. With geosteering, horizontal wells as long as 7000 meters can now be placed within a stratigraphic target window as thin as 2 meters, maximizing the wellbore exposure to the reservoir. The philosophy of engineered completions is to place perf clusters in like rock so that all perf clusters fracture simultaneously, and not have one cluster dominate over others. Petrophysical data are needed as a foundation for engineered completion efforts to maximize stimulation effectiveness. Driven by constant effort to reduce rig time, off-line cased-hole logging has been tested as an alternative to open-hole wireline logging along horizontal wells. Acquisition of petrophysical data in cased hole is possible, but there are additional complications …