Secondary Recovery of Petroleum 791 



Questions 



1. Define "secondary recovery." 



2. Why has secondary-recovery procedure become more important in 

 the oil industry during the past few years? 



3. Summarize the early history of secondary-recovery operations. 



4. What methods are used in secondary-oil-recovery procedure? 



5. What type of field is most adaptable for secondary-recovery methods? 



6. What geologic factors have an important bearing on the results of 

 secondary recovery? 



7. Give a general statement on the costs of secondary-recovery opera- 

 tions. 



8. What are some of the limiting factors on secondary operations? 



