Azimuthal cement evaluation with an acoustic phased-arc array transmitter：numerical simulations andfi eld tests

• Published in: 应用地球物理（英文版） Vol. 13; no. 1; pp. 194 - 202
• Main Authors: Che Xiao-Hua, Qiao Wen-Xiao, Ju Xiao-Dong, Wang Rui-Jia
• Format: Journal Article
• Language: English
• Published: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China 2016
• Subjects: amplitude; azimuthal resolution; Cement bond quality; arrival time; phased-arc array transmitter
• ISSN: 1672-7975; 1993-0658
• DOI: 10.1007/s11770-016-0537-1

We developed a novel cement evaluation logging tool, named the azimuthally acoustic bond tool (AABT), which uses a phased-arc array transmitter with azimuthal detection capability. We combined numerical simulations andfi eld tests to verify the AABT tool. The numerical simulation results showed that the radiation direction of the subarray corresponding to the maximum amplitude of the first arrival matches the azimuth of the channeling when it is behind the casing. With larger channeling size in the circumferential direction, the amplitude difference of the casing wave at different azimuths becomes more evident. The test results showed that the AABT can accurately locate the casing collars and evaluate the cement bond quality with azimuthal resolution at the casing–cement interface, and can visualize the size, depth, and azimuth of channeling. In the case of good casing–cement bonding, the AABT can further evaluate the cement bond quality at the cement–formation interface with azimuthal resolution by using the amplitude map and the velocity of the formation wave.