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skin. An outline of the calculations is in Appendix D. A kh of 12,500 and-ft and a permeability <br /> of 54.4 and were calculated. For skin factor, a value of 0.11 was calculated. The effective <br /> length of the completion interval (h) used in the calculations is 230 ft. This was derived on the <br /> following premises: <br /> 1. The June 8 shut-in temperature profile indicates that "injected" fluid was confined <br /> vertically below the top perforation at 4,234 ft. Therefore, sands above this <br /> depth are not effectively in the injection interval, at least within the radius <br /> affected by this test. <br /> 2. Although the 21-ft interval, 4,411-4,432 ft was not perforated, the rest of the <br /> 117-ft sand body from 4,390 to 4,507 ft was perforated. Therefore, it is assumed <br /> that the entire 117 ft is part of the effective completion interval. <br /> 3. The bottom perforated interval, 4,567- 4,573 ft is blocked off by sand fill. <br /> 4. The interval 4,528-4,538 ft is open to injection, but the spinner and temperature <br /> logs indicate it is taking little if any water. <br /> 5. By eliminating the bottom two sands (below 4,528 ft), the net sand interval open <br /> to injection is estimated to be 230 ft. <br /> Shown in Figure 8.4 is a plot of sandface pressure difference (psi) versus stabilized <br /> injection rate (gpm). The slope of a straight line drawn through these points is the Injectivity <br /> Index (II). The II was found to be 0.537 gpm/psi. If it is assumed that each point in the <br /> injectivity plot represents steady-state conditions, then the radial form of Darcy's law can be <br /> used to estimate the formation permeability. Needed in this type of analysis is an estimate of <br /> Mesquite Group, Inc. -26 <br />