Subsurface Laboratory Methods 



305 



4. Coring with oil-base mud.^'^ 



5. Calculations based on salinities of core water.^^ 



6. Empirical calculations based on the porosity and residual fluid 

 saturations.^^ 



Figure 129. Summary of core data, oil reserve, and recoverable oil of well B. Be- 

 cause of the gas cap and the probability of a water drive, it is apparent that 

 the ultimate recovery will be higher than the solution gas recovery indicated. 



■" Stuart, R. W., Use of Oil Base Mud: Oil Weekly, pp. 41-45, May 27, 1946. 



^' Sage, H. F., and Ai.ustrong, D. M., Estimation of Connate Water from the Salt Content of the 

 Core: Am. Petroleum Inst. Prod. Bull. 223, May 1939. 



** Lewis, J. A., Core Analysis — An Aid to Increasing the Recovery of Oil: Am. Inst. Min. Met. Eng. 

 Trans., pp. 68-75, 1942. 



