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The shut-in temperature log is included in Appendix A, and a compressed plot of the log is shown in Figure 3.2. The log was run after the wellbore fluid had been static for about 73 hours following a change over from mud to a six percent potassium chloride completion fluid. The temperature profile is normal, although there are some small anomalies which are apparent residuals of drilling fluid invasion. There are no indications of interzonal flow, which would be characterized by a smooth, isothermal (or nearly isothermal) interval in the profile. 4.0 CLEANOUT AND PRODUCTION BY NITROGEN LIFT It was originally planned that after perforating, the well would be produced for water samples using an electric submersible pump. However, because of the running sand problem, it was clear that a pump would not work. Instead, the sand was cleaned out and the well was produced for samples in a combined operation using nitrogen injection through coil tubing. This was done on May 15. Nitrogen was injected at rates of 300 to 400 scfm through 1'/z-in. coil tubing to produce the well by gas lift and to clean out the sand. Production (returns) from the well were piped from the tubing head side outlet valves to the rig's shale shaker and mud tank. During the nitrogen lift operation, water was transferred from the mud tank to a 500-barrel temporary holding tank from which it was pumped, filtered and transferred to three clean 500-barrel tanks. The filtered formation water was stored in the clean tanks for an injection test to be done later. During the cleanout and production operation, the four 500-barrel tanks were gauged periodically to determine the volume of water produced and the flow rate between gaugings. Water Mesquite Group, Inc. -5