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CALIPER AND 



TEMPERATURE 



LOGGING 



Wilfred Tapper 



The uses of caliper and temperature records are sometimes so interrelated 

 that a discussion of one log presupposes a discussion of the other. Here, however, 

 for purposes of clarity, the records and the tools used to obtain them are 

 treated separately. 



It is the purpose of this chapter to give an outline of the history, develop- 

 ment, construction, and uses of caliper and temperature electrodes. A know- 

 ledge of the physical construction of both types of electrodes results in a clearer 

 understanding of the data obtained and more efficient utilization of the logs. 



The few anomalies cited as examples do not pretend to be comprehensive. 

 The uses for the various logs listed surely do not exhaust present or future 

 possibilities in the oil industry or in other fields. 



The writer is indebted to Mr. H. K. McArthur, Mr. J. K. Reynolds, and 

 Mr. W. D. Owsley, of the Halliburton Oil Cementing Company, for advice and 

 criticism in the preparation of this chapter. 



CALIPER LOGGING Even in the early days of cable-tool drilling, 



oil men were well aware that drill holes did 

 not stand true to gauge. As holes were drilled deeper and exploration moved 

 southward into the Gulf Coast area, this fact became painfully obvious. 



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