scholarly journals Signals of electromagnetic tool with toroidal coils in highly deviated wells

2021 ◽  
Vol 2099 (1) ◽  
pp. 012059
Author(s):  
I Mikhaylov ◽  
I Surodina ◽  
V Glinskikh ◽  
M Nikitenko
Keyword(s):  
Numerical Analysis ◽  
Finite Difference ◽  
Three Dimensional ◽  
Simulation Algorithm ◽  
Wide Range ◽  
Electromagnetic Signals ◽  
Water Saturated ◽  
Oil Gas ◽  
Logging Tool ◽  
Deviated Wells

Abstract The research is aimed at expanding the applicability of the logging tool with toroidal coils from vertical to highly deviated wells. Its electromagnetic signals are computed with a three-dimensional finite-difference simulation algorithm on the computing resources of the Siberian Supercomputer Center of SB RAS, which is accompanied by a multi-aspect numerical analysis of the signals. We consider a wide range of geoelectric models with various resistivity contrasts: those of oil-, gas- and water-saturated reservoirs having a different number of horizontal boundaries and varying thicknesses, including the case of fine layering.

Using 3D finite-difference modeling to design wide-azimuth surveys for improved subsalt imaging

Geophysics ◽  
2007 ◽  
Vol 72 (5) ◽  
pp. SM231-SM239 ◽  
Author(s):  
Carl J. Regone
Keyword(s):  
Image Quality ◽  
Finite Difference ◽  
Three Dimensional ◽  
Design Parameters ◽  
Ocean Bottom ◽  
Field Development ◽  
Wide Range ◽  
Dense Grid ◽  
Subsalt Imaging ◽  
Important Design

Three-dimensional finite-difference modeling studies conducted over subsalt structures in the deepwater Gulf of Mexico confirm the deficiencies of narrow-azimuth towed-streamer surveys and predict significant improvement in image quality with wide-azimuth methods. Finite-difference modeling has provided important design parameters for two separate approaches for wide-azimuth surveys: ocean-bottom receivers distributed in a sparse grid on the ocean floor coupled with a dense grid of source points on the surface, and a wide-azimuth towed-streamer method using multiple seismic vessels in a novel configuration. These two methods complement each other. Ocean-bottom receivers may be used effectively where field development has resulted in many obstacles that might interfere with towed-streamer methods, where the required size of the 3D survey is not too extensive, or where very long offsets are required for all azimuths. Towed-streamer methods are more efficient for large surveys, and key parameters in the wide-azimuth towed-streamer method can be varied to provide a wide range of cost versus data-quality options to make the method suitable for application in scenarios ranging from exploration to field development.

Three-Dimensional Numerical Analysis of Excavation and Support of Deep Foundation Pit

2012 ◽  
Vol 446-449 ◽  
pp. 1922-1926
Author(s):  
Chang Zhi Zhu ◽  
Xing Lian Zheng
Keyword(s):  
Numerical Analysis ◽  
Finite Difference ◽  
Three Dimensional ◽  
Horizontal Displacement ◽  
Test Results ◽  
Deep Excavation ◽  
Analysis Model ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit

Based on a project, a numerical analysis model was established by the finite difference program and the process of the deep excavation and support was simulated by computer, the distribution of the horizontal displacement and settlement of the top of slope of the slope soil were obtained. The simulation result was consistent with the test results. It shows that the method of numerical analysis can be used to the simulation of the excavation and support of Deep Foundation Pit, and it will provide the basis for the design and construction of practice project.

scholarly journals SUBSTANTIATION OF PHYSICAL EXPERIMENTS WITH ELECTROMAGNETIC TOOL IN THIN-LAYER MODELS SUBSEQUENT TO NUMERICAL SIMULATION RESULTS

2021 ◽  
Vol 2 (2) ◽  
pp. 168-173
Author(s):  
Igor V. Mikhaylov ◽  
Marina N. Nikitenko ◽  
Irina V. Surodina
Keyword(s):  
Numerical Simulation ◽  
Finite Difference ◽  
Thin Layer ◽  
Physical Experiments ◽  
Simulation Results ◽  
Electromagnetic Signals ◽  
Logging Tool

We performed 3D finite-difference simulation of electromagnetic signals from the logging tool with toroidal coils in electrolytic-tank-based thin-layer models. Following the simulation results, we elucidated the thicknesses and resistivities of the interlayers, for which the signals in a thin-layer and the equivalent macroanisotropic model coincide within the specified error.

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