Then Equation 8 becomes 



This relationship may be used to approximate the radial distance from a 

 wellbore that a barrier can be detected on a DST chart. The permeability, k, is 

 in md, and the flow time, t , is in minutes. For example, if the effective perme- 

 ability were 100 md, and the total flowing time were 100 minutes, then it would 

 be unreasonable to expect the detection of barrier interference at a range 

 greater than 100 ft. 



Reprinted from the Journal of Petroleum Technology and Petroleum Transactions, 

 AIME, v. 210, p. 318-324 (Nov. 1957). T. P. 4667) 



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761 



