Alan N. Simon & John J. Keesey, Pan American Petroleum Corp.
In recent years, the practice of running one or more of a variety of downhole logging tools to obtain a dynamic production profile has gained considerable acceptance. This method is particularly useful in multiple zone reservoirs where identification of productive intervals by the more conventional means of selective testing is difficult. Recently, Pan American Petroleum Corp. conducted 13 such surveys in several West Texas waterflood projects to assist in evaluation of waterflood performance. Eleven of the surveys were obtained by running the logging tools through the tubing casing annulus in wells equipped with either 5-1/2 in or 7-in. casing. Appropriate steps necessary to prepare these wells for logging tools employed. Several problems encountered during logging operations and their solutions are also discussed. Results of the surveys are reviewed along with the results of remedial work subsequently performed on two wells.