Halliburton has introduced its XBAT azimuthal sonic and ultrasonic logging-while-drilling (LWD) service (Fig. 7). The XBAT LWD service delivers accurate acoustic measurements in a wide range of formations through sensors and electronics that are less sensitive to drilling noise and have a wide frequency response. The result is a greater signal/noise ratio that enables better measurements even in noisy drilling environments and poor hole conditions. The XBAT LWD service has delivered accurate measurements in formations across the globe and has been tested extensively in the challenging environments of the North Sea and the Gulf of Mexico. The XBAT LWD service uses four discrete transmitters and four azimuthally spaced receiver arrays. Each receiver is sensitive across a broad range of frequencies and is isolated from the collar to eliminate bit and mud-circulation noise. Using results from a broad range of frequencies, the XBAT LWD service provides a 3D image of the velocities around the wellbore.
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