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The measured electromagnetic resistivity from the logging-while-drilling (LWD) tool is affected by mud-filtrate invasion. An inversion method is carried out to obtain accurate formation resistivity, resistivity of flushed zone, and invasion depth. We studied the invasion pattern of mud-filtrate based on the data of inversion. We observed that the invasion depth can be expressed as a function of parameters...
A vector finite element method (FEM) combined with the algebraic multigrid (AMG) method and a multifrontal solver is used to simulate the response of a electromagnetic logging-while-drilling (LWD) tool in a three dimensional (3D) inhomogeneous medium. A layered medium with a dipping borehole and invaded zones is partitioned into tetrahedrons. Each tetrahedron has six vector edge elements. The algorithm...
This article describes a volume adaptive integral method (VAIM) for electromagnetic scattering from three-dimensional (3-D) inhomogeneous objects. By projecting the unknown current density within an arbitrary element in the inhomogeneous object onto a fictitious uniform grid, this method calculates the far-zone interactions of basis and testing functions through the fast Fourier transform, thus greatly...
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