INTRODUCTION AND SCOPE The use and value of electrical logs of all types has been greatly increased and expanded since the writing of the first edition of RP 31. It is now common practice in the industry to calculate porosity and water-saturation data from electrical logs. Many changes have evolved in log presentation and the data recorded on logs in order to facilitate the needs of users. In order to create uniformity and eliminate many of the omissions and deletions of necessary and desirable data on electrical logs@ the standard practice for these logs has been revised and brought up to date. The greatest advantage to standardization in log form and data presented in the log heading is convenience to the user by having complete information in the same location on all logs. The minimum requirements for calibration of electrical-type logs outlined herein will enhance the value of logs by substantiating their accuracy for all users. This recommended standard practice is intended to cover all electrical logs@ rather than only the conventional electrical survey (e.g.@ microdevices@ focused resistivity logs@ induction-type logs@ etc.). It is recommended that the format@ scale@ etc.@ described here be followed as closely as possible for auxiliary logs such as dipmeter@ temperature survey@ spinner@ caliper@ section gage@ formation tester@ directional survey@ collar location@ acoustic@ velocity@ sonic@ etc.
API RP 31-1959 history
1967API RP 31-1967 RECOMMENDED PRACTICE AND STANDARD FORM FOR ELECTRICAL LOGS THIRD EDITION (R 1976) (WITHDRAWN)
1959API RP 31-1959 RECOMMENDED PRACTICE AND STANDARD FORM FOR ELECTRICAL LOGS (SECOND EDITION)
1948API RP 31-1948 RECOMMENDED PRACTICE for STANDARD ELECTRICAL LOG FORM (First Edition)