2011-08-17_HYDROLOGY - P2008046 - Laserfiche WebLink

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Mr. Travis Marshall Mr. Kent Walter Ms. Wendy Cheung Page 2 of 4 general completion information for the test well, a description of the test procedure, summary of test results, tabulation of recorded down -hole pressure data, and graphical representations of down -hole pressures. The step rate test was conducted within well TM -1, an Area of Review well located approximately 75 feet (ft) from the well T1 -P (the injection well). The test interval in the well extended from the casing point (1,976 ft below ground surface [bgs]) to the bottom of the well bore (2,255 ft bgs). As shown in the cross section, the test interval includes each of the injection intervals specified in the UIC Program permit: lithologic zones R1, LO, and R0. The test was designed to not exceed a bottom -hole pressure of 1,170 pounds per square inch (psi); the surface pressure required to achieve the maximum bottom -hole pressure was calculated to be 138 psi. Beginning at an initial surface pressure of 0 psi, the surface pressure was incrementally increased by 25 psi to complete each step, to a maximum surface pressure of 140 psi. During each step, the well was shut - in, and pressure- recording devices were used to continuously monitor the surface and down -hole pressures for a period of 15 minutes. The final step to 140 psi was monitored and recorded for 60 minutes Test results are summarized in Tables 1 and 2 of the step rate test report presented in Attachment A. Table 1 presents the surface pressure readings for each step, the equivalent (calculated) down -hole pressures, and the final surface pressure at the end of each step. Table 2 presents the recorded maximum down -hole pressure after each step was initiated and the final recorded down -hole pressure at the end of each step. Test results are graphically depicted in Chart 1 of the step rate test report. As shown, each incremental surface pressure increase resulted in a proportionate increase in the down -hole pressure. The results further show that no abrupt deviations in the increasing trends were observed which otherwise would have indicated that the fracture pressure had been exceeded. These results demonstrate that the MAID established in the UIC permit does not exceed the fracture pressure of the injection zone, and in fact, the fracture pressure of the injection zone is greater than 1,068 psi. Well BH -1 Resistivity and Porosity Logs In accordance with Appendix B of the UIC permit, a porosity log and a resistivity log were run in well BH -1, instead of well T -1P. Well BH -1 was completed and logged as shown on the stratigraphic cross section presented in Attachment B. The well was drilled to a total depth of 2,400 ft bgs on May 4, 2009. The well was completed with surface casing to a depth of 40 ft bgs, below which the hole was uncased to the bottom of the well bore. The well was logged on May 30 — 31, 2009. Well BH -1 porosity and resistivity measurements were obtained by Schlumberger using the Platform ExpressTM integrated wireline logging tool. Measurement results are presented on the two logs provided in Attachment B. Both logs present the same measurements for porosity, but the logs utilize different logging configurations for resistivity measurement; 1) High- Resolution Laterlog and 2) Array Induction. The logs presented in Attachment B show the results of caliper, gamma ray, SP, and multiple resistivity and porosity measurements for well BH -1. On the induction log, resistivity is presented in multiple depths of investigation using lateral spacings of 10, 20, 30, 60 and 90 inches. The logs for the various depths of investigation are generally similar within the scale presented. Porosity is presented as a density log (DPHZ) and a neutron log (NPOR). It is important to note that in the Parachute Creek Member of the Green River Formation where kerogen content is common, the DPHZ and NPOR logs represent both water and kerogen porosity.