Paper: Acoustic Cement Evaluation ACE Operation Calibration Interpretation

The ACE log is an efficient aid in determining the quality of reservoir isolation achieved through primary or squeeze cementing. A subject of controversy since its inception, cement bond evaluation has improved with advanced technology and with continued concern by the industry for an effective evaluation meth0d.l A better understanding of the operations principles by service company and operations personnel, meaningful calibration, and the application of logic to interpretation are some of the factors responsible for increased acceptance by the industry. Properly run ACE logs respond to downhole conditions that are present, which may or may not correspond to the expected conditions. Unlike formation evaluation logs, there are no correlative factors extending from well to well to act as repeatability checks. Each log must stand on its own, and its interpretation must be supported with logic. The lack of standardization of logging systems by service companies should not present an insurmountable problem to log quality or interpretation if proper basic logging principles are followed.