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• <br />Figure 10 indicates what can be determined by a temperature log as a result of an endother- <br />mic process such as occurs when sodium chloride is dissolved in water. The absorption of heat <br />from the injection water results in the anomalies shown in this slide. <br />Curve # 1 and # 2 is a Gamma Ray-Neutron Log run on an injection well. Curve # 3 is a <br />Temperature Log run on the well the same day. Note the Neutron Log indicating a cavity at 2, 220 <br />to 2, 240 feet, and another cavity from 2, 265 to 2, 330 feet. The Neutron Log does not show solu- <br />tion activity too conclusive, bu[ the Temperature Log indicates activity down to 2, 480 feet. <br />GAMMA NEUTRON CALIPFR TEMPERATURE <br />RAY <br />(OfAMEifR) CF) <br />1100 <br />7W <br />7300 <br />1~C0 <br />1500 <br />Figure 10 <br />Curve # 1 and # 2 of Fig. 11 is a Gamma Ray-Neutron Log run on the well at completion <br />date, The Temperature logs were run under the following conditions: Curve # 1 was recorded <br />after the well had been inactive for approximately 30 days. The log indicates that solution activity <br />had taken place from I, 990 to 2, 140 feet. Curve # 2 was recorded after one hour of injection. The <br />well was flowing back at the rate of 20 gallons per minute. Solution activity is apparent at the base <br />of the pipe set a[ 1, 990 fee[. Following the recording of Curve A 2, the well was injected into for <br />nine days. The injection was stopped and the well allowed to reach a static condition. Curve # 3 <br />represents the Temperature Log indicating where the endothermic process took place in the well. <br />Figure 12 indicates the temperatures and calipers recorded on an active injection and pro- <br />ducing well. Curve # 1, a Caliper, indicates the top of the cavity to be at 2, 338 fee[. This is pre- <br />cisely the depth the Temperature, Curve # 2, indicates solution activity is taking place in the in- <br />jection well. Curve # 3 shows a cavity existing at 2, 368 feet in the active. producing well. Curve <br /># 4, a Temperature Log, indicates no solution activity in this well. It can, therefore, be assumed <br />all solution activity is taking place in the injection well. <br />An example of how a magnetic casing collar locator and a Caliper Log may be used to deter- <br />mine apoor pipe condition existing in a well is presented in Fig. 13. Curve # 1 is a Gamma Ray <br />Log of the well. Curve # 2 is the recorded casing collar locator. An examination of the curve in- <br />dicates unexpected metal changes at 2, 025 and 2, 118 feet. Curve 8 3 is a Neutron Log of the prob- <br />lem well. Note the washed out salt section from 1, 985 to 2, 026 feet. Also, the sal[ section <br />immediately above and below the depth of 2, 118 feet. Curve # 4 is a Caliper Log of the <br />63 <br />., <br />