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~~~. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY <br />~~ REGION VIII <br />\~\llf/~`/ 999 18th STREET -SUITE 500 <br />DENVER, COLORADO 80202-2486 <br />TEMPERATURE LOGGING FOR MECHANICAL INTEGRITY <br />January 12, 1999 <br />PURPOSE: <br />The purpose of this document is to provide a guideline for the acquisition of temperature <br />surveys, a procedure that may be used to determine the internal mechanical integrity of tubing and <br />casing in an injection well. A temperature survey may be used to verify confinement of injected <br />fluids within the injection formation. <br />LOGGING PROCEDURE <br />Run the temperature survey while going into the hole, with the temperature sensor located as close <br />to the bottom of the tool as possible. The tool need not be centralized. <br />Record temperatures a 1-5 °F per inch, on a 5 inches per 100 feet log scale- <br />Logging speed should be within 20 - 30 feet per minute. <br />Run the log from ground level to total depth (or plug-back depth) of the well. <br />When using digital logging equipment, use the highest digital sampling rate as possible. Filtering <br />should be kept to a minimum so that small scale results are obtained and preserved. <br />Record the first log trace while injecting at up to the maximum allowed injection pressure. <br />Subsequent to the temperature survey, the maximum injection pressure will be limited to the <br />pressure used during the survey. <br />LOG TRACES <br />Log the first log trace while the well is actively injecting, and record traces for gamma ray, <br />temperature, and differential temperature. <br />Shut•in (not injecting) temperature curves should be recorded at intervals depending on the length <br />of time that the injection well has been active. Preferred time intervals are shown in the following <br />table: <br />., ..r,.,., .. . <br />Active In ectlon Retord.Curves at These Times In Hours ~>s^,~.:tr <br />1 month 1 3 6 12 <br />6 months 1 6 10.122 22.24 <br />1 year 1 10.12 22.24 45.48 <br />5 years 1 10.12 22.24 45.48 90.96 <br /> <br />H:\UIC\RBUIC~Guidance\INF6TempLog.wpd January 12. 1999 <br />PrhrMd °^ Rrrayr Iepr <br />