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Geothermal Rules <br />Effective Date: September 30, 2004 <br />prior to performing a mechanical integrity test, the owner or operator shall notify the <br />State Engineer in writing of the scheduled date on which the test will be performed. <br />10.2.1 The mechanical integrity test shall include at least one of the following <br />procedures to determine whether the casing, injection pipe, or packer leaks: <br />a. a pressure test of the injection pipe of not less than thirty (30) minutes and <br />not less than three hundred (300) psi or the maximum projected injection <br />pressure, whichever is greater, while monitoring annular pressures and/or <br />fluid levels. A ten (10) percent loss or gain of pressure shall signify a <br />failure of the test; or, <br />b. any test or combination of tests considered effective by the State <br />Engineer. <br />10.2.2 In order to verify that a fluid will not escape vertically through the <br />borehole, the mechanical integrity test shall be supported by one or more of the <br />following: <br />a. cementing records; <br />b. tracer surveys; <br />C. cement bond log or other acceptable cement evaluation log; <br />d. temperature surveys; or, <br />e. any other test or combination of tests considered effective by the State <br />Engineer. <br />10.3 Well Head Equipment - The well head equipment installed on a reinjection well <br />shall be capable of controlling and monitoring expected injection and annulus <br />pressures. <br />10.4 Testing of a Geothermal Reinjection Well - A flow test shall be performed on a <br />geothermal reinjection well for a period of at least one (1) hour, and the results shall be <br />reported to the State Engineer. The test shall be designed to provide data for the <br />determination of hydraulic parameters of the injection interval and its suitability for the <br />proposed reinjection. <br />10.5 Maximum Injection Pressure - The injection pressure for a geothermal well <br />shall not exceed the maximum pressure approved by the State Engineer or a bottom <br />hole pressure that will fracture the reservoir. <br />24 <br />