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Curve N 5 representhe diameter of well bore after 45 ~s of water injection. Note the <br />leaching action that has caused increased hole diameter in the upper four salt sections. This was <br />an undesired result as it was hoped to force leaching in the bottommost salt section first. <br />When it is impractical to pull a liner to determine where solution action is taking place, a <br />Neutron Log may be run in lieu of pulling the liner and running a Caliper. In Fig. 8 Curve N 1 is a <br />Gamma Ray Log and indicates lithology. Curve ~' 2 is a Neutron Log chat was made with hole di- <br />ame[ers as indicated by the Caliper (Curve R 3). After approximately five months injection, an- <br />other Gamma Ray-Neutron Log (Curves N 4 and N 5) was run to determine which salt zones were <br />being affec[ed. The changes in zones from 2, 062 to 2, 100 feet and 2, 106 to 2, 138 feet is apparent. <br />Some change had been made in the zone from 2, 002 to 2, 035 feet. Note the eight-foot zone from <br />2, 030 to 2, 038 feet. At the time the liner was pulled, along-armed Caliper was recorded to con- <br />firm washed out zones indicated by the Neutron Log. <br />A Temperature tool and log may be classified as a formation evaluation as well as a well <br />completion tool. The Temperature tool depicted in Fig. 9 displays a gamma ray tool to which the <br />temperature module is attached. The temperature sensing device must be so posi[ioned that the <br />temperature of the material supporting it will not affect the recorded temperature. The pictured <br />tool utilized a thermistor as the temperature sensing device. It con[ains an element whose resis~- <br />ance changes appreciably wi[h small change's in temperature. A thermis[or has a very short time <br />constant in water and accep[able time constants in gas and air. <br />GRAYA NEUTRON CALIPER GRAYA NEUTRON CALIPER <br />A. E I. CALIERATO! A F I CALIBRATOR <br />UNITS UNITS <br />0 tl ,b <br />2~ <br />71W <br />~~ <br />1~ <br />I~ 0 W IT. <br />7~ <br />ZIP <br />2~ <br />)~ <br />Figure 8 <br />Y C Ii' A li 7f if 16 d ,i <br />Figure 9, Tempcruure Toot <br />62 <br />,. <br />