Method for acquiring data of azimuthal acoustic logging while drilling

A method for acquiring data of azimuthal acoustic Logging While Drilling (LWD), comprising:

• rotating a drilling tool in a well in a subterranean formation, wherein the drilling tool comprises an acoustic instrument having an acoustic transmitter and an acoustic receiver installed thereon;
• performing an azimuthal equal-interval acquisition mode for acoustic logging using the acoustic instrument at a first depth in the well, wherein the step of performing an azimuthal equal-interval acquisition mode for acoustic logging comprises the sub-steps of:
• a. dividing a circumference of the well into m sectors, each sector has an azimuthal angle of 360°/m, wherein m is an integer larger than one;
• b. measuring a toolface angle θ of the acoustic instrument;
• c. determining the acoustic instrument is in a kth sector when the toolface angle θ is larger than (k−1)·360°/m and smaller than k·360°/m, wherein k is in a range from 1 to m;
• d. transmitting an acoustic signal from the acoustic transmitter into the subterranean formation when the acoustic instrument is in the kth sector;
• e. receiving the acoustic signal by the acoustic receiver from the subterranean formation;
• f. digitizing and storing the received acoustic signal as data in the kth sector, wherein data is waveform data;
• g. repeating sub-steps d, e, and f so that the kth sector receives N sets of data, wherein N is a positive integer;
• h. superimposing the N sets of data to obtain an superimposed data volume for the kth sector;
• and
• i. performing sub-steps c-h for a (kth+1) sector until (kth+1) equals m.