Logging through casing is an important measurement for reservoir surveillance in mature fields. In the last 70 years, thousands of producers have been drilled in Y field, Saudi Arabia, and many are producing water. Successfully identifying by-passed oil and monitoring oil/water movements are critical for successful management of the Y field. In this study, cased-hole formation resistivity (CHFR*) was field tested and evaluated in two wells in the Y field and in a third well in Z field. The three tests cover the following conditions; carbonate and shaly sand reservoirs, vertical and horizontal wells, and oil producing and water injection wells. In general, the CHFR measurements agree well with the open- hole wireline and LWD logs. In low and high resistivity reservoir intervals, differences were observed. To address these differences, CHFR theory is reviewed and application conditions of CHFR logging are discussed. Guidelines for future CHFR jobs are presented.
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