相控线阵声波辐射器在声波测井中应用的可行性分析

In this paper, both characteristics and feasibility of linear phased array in acoustic well-logging are investigated by using FEM simulation. Numerical results show that if appropriate delay times of sources are exerted on elements of phased array, direction of acoustic beam radiated from the phased array can be steered so that the refracted compressional wave and the refracted shear wave can be excited effectively. Moreover, if lower frequency or weighted phased linear array is employed, main lobe of the phased array can be widened so that the refracted compressional wave can be estimulated sufficiently both in hard formation and in soft formation. Therefore, linear phased array can be used to improve quality of well-logging data and enhance both signal-to-noise ratio and exploring capacity of acoustic well-logging radically.