Fluid Identification - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 89

Figure 7.3 shows the expected friction gradient as a function of pipe ID and flow
rate. In normal circumstances (5½- or 7-in. casing), the friction term is negligible.
Fig. 7.3 Friction gradients caused by fluid flow in small pipe. Courtesy Schlumberger
Figure 7.4 shows a gradiomanometer recording. The tool is logged continuously
up (or down) the hole and records fluid density vs. depth. The log is normally
recorded with a sensitivity of 1 g/cm 3 per log track. An amplified curve with 5-10
times the sensitivity is commonly recorded as well.
Fig. 7.4 Gradiomanometer log. Courtesy Schlumberger