The increasing knowledge of the problems of fluid injection in secondary recovery operations has resulted in the need for improved accuracy of well profile information. As profiling techniques have been improved and well information accumulated, the importance of well conditions to the interpretation of profile surveys is becoming more apparent. Conditions such as changes in tubing or casing sizes, variations in open hole diameter, paraffin or scale deposits, and vertical fractures are some of the factors that cause errors in interpretation. The mechanical and chemical conditions, as well as the human factor, are covered in this paper to provide the engineer with information needed and the proper procedure to use to obtain more efficient profiles.

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