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PERMEABILITY 



SURVEYING 



METHODS 



P. E. Fitzgerald 



and 



S. J. Martinez 



Permeability surveying is practiced commercially in exploratory wells, 

 development wells, and secondary-recovery projects. Its most valuable appli- 

 cation is in guiding and evaluating work-over and remedial operations. The 

 service is available to most oil-producing areas in the United States, Canada, 

 and Venezuela. 



The term permeability surveying is somewhat of a misnomer. Actually, 

 this type of well surveying results in a graphic profile indicating the relative 

 permeability of each zone in the well. Such permeability determinations, when 

 correlated with core-analysis data, may be used to estimate the absolute perme- 

 ability in darcies. 



USES Permeability -profile surveys are a source of 



vital information for such work as selective 

 acidizing, selective shooting, plugging for the control of water-oil or gas-oil 

 ratios, or nearly any type of remedial work on wells. 



When correlated with other well information such as geological data, core 

 logs, electric logs, and production data, the permeability profile also assists in 

 locating the position of high water- or gas-producing zones. It can be utilized to 

 determine the location, thickness, and relative capacities of various exposed 



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