HIGH FREQUENCY CEMENT BOND LOG TOOL TEST.

Higher acoustic frequencies are more difficult to attenuate in casing than lower frequencies. A field test of Company B's**2 small diameter (1-11/16″ ) cement bond log (CBL) tool with a higher frequency (30 kilohertz) indicates that results from this tool should be interpreted the same as a shorter spaced 3-5/8″ O. D. 20 KH CBL tool. ″Quantitative″ interpretation based on compressive strength estimates from amplitude readings can be made with the small tool with four foot transmitter receiver spacing using the compressive strength chart for the three foot spaced larger diameter tool.