Subsurface Laboratory Methods 



319 



that form the basis for pressure maintenance, repressuring, and secondary- 

 recovery programs. Unless complete core data are available for all gas- 

 or water-injection wells, it is generally impossible to predict the course 

 of the injected fluids. The permeability profile may be used selectively 

 to perforate or pack water- or gas-injection wells so that zones of low 

 permeability will not be by-passed by the injected fluids. 



Core permeability data may be used to plot isoperm maps and thus 



Figure 133. Summary of core data, oil reserve, and recoverable oil. This sand has 

 a very high productive capacity as measured by dry-gas flow. The sand should 

 be cored and completed with oil-base fluids. The low connate-water saturation 

 together with the high porosity results in high reserve and recoverable-oil esti- 

 mates. 



