Figure 9 shows a horizontal well with 29 frac stages. Uniquely differentiable  FlowProfiler oil-soluble tracers have been pumped into every frac stage. As the well  begins to flow, Core collects and analyzes the oil, looking for all 29 tracers. If all 29  are present, the operator knows all the frac stages are flowing oil. If any tracers are  not recovered in the produced oil, the operator knows which of the 29 stages need  to be remediated to optimize flow and ultimate hydrocarbon recoveries. Because tight-oil reservoirs have ultra-low permeabilities, numerous hydraulic fracture  events are required to enable oil to flow to the surface. When these frac stages are  too far apart, as shown in Figure 10, crude oil can become stranded between two frac  events. To decrease the possibility of that occurring, Core has always recommended  more frac stages, spaced closer together to ensure reservoir drainage. Core has also  recommended longer horizontal sections to reach more reservoir rock and over-  pumping proppant to ensure the longest fracture patterns possible. Some of the over 100 companies participating in Core Laboratories’ joint-industry  projects are listed in Table B. Table C lists Core Lab’s tight-oil joint-industry projects.  Each participating company must  provide several cored intervals from  tight-oil reservoirs. From those Core  generates the analytical data sets the  client companies use to optimize the  tight-oil developments in the studies.  Core Lab anticipates that over eight  miles of shale core will be characterized  in some of these studies. Data sets and  recommendations available from the  studies are being used by the partici- pating companies to optimize drilling,  completion, and stimulation programs  in tight-oil reservoirs throughout North  America and the world. These projects, coordinated by Core’s  Reservoir Management operations, will  also utilize data sets and the services  and technologies provided by the  Company’s Reservoir Description and  Production Enhancement segments.  Reservoir Description field operations  will provide handling, preparation, and  preservation of shale cores and reservoir  fluid samples at the well site and will  transport them to the laboratory. Table B. Joint-Industry Project Participants. RESERVOIR MANAGEMENT SERVICES BP Exploration BHP Billiton Hilcorp Chevron Cabot Oil & Gas Husky ConocoPhillips Chesapeake Energy Idemitsu Oil & Gas ExxonMobil Encana Laredo Petroleum Shell EOG Resources Maersk Total Hess Corporation Murphy Oil Brunei Shell Petroleum Hunt Oil  Newfield Exploration ENI Marathon Oil Nexen KNOC Noble Energy Petroquest Energy Petro SA Oxy Range Resources Petrobras Pioneer Natural Resources Samson Saudi Aramco Devon Energy SM Energy Statoil DiamondBack E&P Swift Energy Anadarko Petroleum Enerplus Resources Ultra Resources Apache Corporation Halcon Whiting Oil & Gas Avalon & Wolfcamp Regional Study Niobrara Duvernay Regional Study North America Shales Eagle Ford Shale Oklahoma – Woodford Shales Eaglebine Pearsall Marcellus Shale Tight Oil Williston Basin Midland Basin -Tight Oil Reservoirs Tight Sands North America & Global Mississippi Lime Utica Montney Regional Study Woodford Shales – Midland Basin Table C. Tight-Oil Joint-Industry Projects.