Analysis and Correction of Borehole Effect on the Responses of Multicomponent Induction Logging Tools

Sun, Xiang Yang; Nie, Zaiping; Li, Aiyong; Luo, Xi

doi:10.2528/pier08072206

Cited by 17 publications

(5 citation statements)

References 18 publications

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“…Many inversion methods have been used to interpret log responses, among which gradient-based methods (e.g., the most rapid descent and Gauss-Newton methods) are favored for their ease of implementation and fast convergence (Sun et al, 2008;Kara and Farquharson, 2022). However, in complex inhomogeneous formations, the inversion based on MCFL to determine the formation parameters is non-linear and ill-posed (Shen et al, 2020;Hao et al, 2021).…”

Section: Mcfl Data Processing and Applicationsmentioning

confidence: 99%

Research and application of high-resolution micro-cylindrically focused logging tool

Xia

et al. 2023

Front. Earth Sci.

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The unknown nature and complexity of non-uniform formations cause new difficulties and challenges to the accurate detection of electrical instruments in shallow formations. The micro-cylindrically focused logging tool (MCFL) can provide three original measurement curves, RB0, RB1, and RB2, with different detection depths, which reflect the flushing zone resistivity, mudcake resistivity, and mudcake thickness. In this study, the finite element method was used to model and analyze the micro-cylindrically focused logging tool tool in a three-dimensional non-uniform medium model. By converting the partial differential equation into a generalized polar problem, the logging response characteristics of the micro-cylindrically focused logging tool tool at different detection depths and ranges, mudcake thicknesses, flush zones, and mudcake resistivity contrasts were investigated. Inverse processing of the micro-cylindrically focused logging tool data using the least-squares method was used to obtain the flush zone resistivity, mudcake resistivity, and mudcake thickness, based on which the micropotential and microgradient curves were synthesized. In addition, a digital focusing method was proposed to improve the focusing accuracy and flexibility of the instrument, enhancing the performance of the micro-cylindrically focused logging tool. The optimized design of the focusing method significantly improved the detection performance of the pole plate. This plays an important role in the evaluation of thin layers and oil-water reservoirs.

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Section: Mcfl Data Processing and Applicationsmentioning

confidence: 99%

Research and application of high-resolution micro-cylindrically focused logging tool

Xia

et al. 2023

Front. Earth Sci.

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“…When the GF of the transmission line is known, the components of the spectral GF of the magnetic field generated by the magnetic current source can be obtained by comparing (A-10) with (10).…”

Section: Case 3: the Field Point Is Above The Layer Where The Source Point Is Locatedmentioning

confidence: 99%

Numerical Simulation and Analysis of Multicomponent Induction Logging Response in Anisotropic Formation

Sun

et al. 2020

IEEE Access

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In this article, the response characteristics of multicomponent induction logging (MCIL) tool in anisotropic formation are analyzed. To solve the 1-D MCIL problems, we use a planar layered anisotropic medium (PLAM) Green's function (PLAMGF) method which is derived from the layered-medium Green's function (LMGF) and combined with MCIL excitation source and anisotropic formation environment, and then use it to investigate the equivalence of the MCIL tool responses in two models, i.e. the microscopic thin interbed formation and macroscopic anisotropic formation, and also analyze the effects of shoulder bed and formation dip on MCIL tools. In addition, in order to solve the complex 3-D problems, such as the effects of borehole, tool eccentricity and invasion on the tool response, we use the finite element method (FEM) based on a proposed new meshing scheme to simulate and analyze. This new meshing scheme includes two aspects: the use of cylindrical hexahedron element and the flexible meshing strategy combined with domain decomposition. Finally, some key detection performances of coaxial coils and coplanar coils of MCIL tool are studied. Numerical experiments are conducted to prove the effectiveness of our proposed method and provide the detailed results of the aforementioned aspects.INDEX TERMS Multicomponent induction logging (MCIL), Green's function (GF), electric anisotropy, finite element method (FEM).

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“…In Wang et al [] Fourier series expansion was used to reduce the original 3‐D problem to a series of independent 2‐D problems that were solved semianalytically using normalized Bessel and Hankel functions. In addition, an analytical low‐frequency formulation based on the generalized reflection and transmission coefficient matrices was used to simulate and study the effect of eccentricity on induction tool responses [ Sun et al , ].…”

Section: Introductionmentioning

confidence: 99%

Fast electromagnetic modeling in cylindrically layered media excited by eccentred magnetic dipole

2016

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We developed a fast algorithm to calculate a response of cylindrically layered media excited by the vertical magnetic dipole eccentred with respect to the axis of symmetry. The algorithm calculates response in the range of frequencies typical for induction and dielectric logging. The media conductivity and dielectric constant are described by piecewise‐constant functions. The corresponding boundary value problem is solved by method of separation of variables. Fourier transform is applied to Maxwell equations and boundary conditions to express field components through Fourier transforms of vertical components of an electrical and magnetic field. In addition, an expansion of vertical components into an infinite series with respect to angular harmonics is used to reduce the original problem to a series of 1‐D problems that only depend on the radial coordinate. The solution to each 1‐D radial problem for the angular harmonics is presented as a linear combination of modified Bessel functions. Finally, inverse Fourier transformation is applied to the angular harmonics of vertical components to derive electrical and magnetic field of the original boundary value problem. We provide detailed discussion on the elements that are critical for the numerical implementation of the algorithm: a proper normalization, convergence, and integration. Specifically, we show how to perform integration in the complex plane by avoiding intersection of the integration pass with the cuts located on the Riemann surface. Numerical results show the usefulness of the algorithm for solving inverse problems and for studying the effect of eccentricity in induction and dielectric logging.

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Analysis and Correction of Borehole Effect on the Responses of Multicomponent Induction Logging Tools

Cited by 17 publications

References 18 publications

Research and application of high-resolution micro-cylindrically focused logging tool

Research and application of high-resolution micro-cylindrically focused logging tool

Numerical Simulation and Analysis of Multicomponent Induction Logging Response in Anisotropic Formation

Fast electromagnetic modeling in cylindrically layered media excited by eccentred magnetic dipole

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