This review article revisits and outlines the perfectly matched layer (PML) method and its
various formulations developed over the past 25 years for the numerical modeling and …

Rock elastic properties play an important role in the geological characteristics of reservoirs.
The analysis of these properties is normally based physical experiments on rocks. However …

Well cementation, pum** cement into the annulus between the casing and rock or
between two casings after drilling, is a key step of well completion to keep well and …

We use a 3-dimensional finite difference method (3DFD) to study acoustic reflection
wavefields generated by a monopole-logging tool in a fluid-filled borehole surrounded by …

The monopole acoustic transmitters of existing logging while drilling (LWD) tools rarely have
directional radiation capacity. Only a small amount of energy is radiated to geological …

During logging-while-drilling (LWD) operations, complex drill string movements and the
weight of the drill pipe often lead to a measurement tool that is not centralized. Therefore …

The accuracy of velocity measurements made using a monopole acoustic logging-while-
drilling (ALWD) measurement tool is influenced by the eccentering of the tool due to …

The acoustic method, being the most effective method for cement bond evaluation, has been
used by industry for more than a half century. However, the methods currently used are …

Elastic properties of rock are being used to help evaluate reservoir properties. Distinctive
properties of shale, such as low porosity and permeability, anisotropy, and complicated …

As a key technology to evaluate cement bonds in the cased hole, an advanced ultrasonic
logging tool combines pulse-echo and pitch-catch measurements in which the latter one …