Computer Codes

This code was developed based on FEM code developed by Dr. Weishan Han in 2004. The improvements are on computational speed using field symmetry. The use of field symmetry does not limit generosity of full 3D simulation. Therefore, the code is able to simulate tri-axial induction logging tool response in complex anisotropic formation with tilt angles, multi-layers, and multi-invasion zones. To simplify parameter input, this tri-axial code is divided into two different codes to handle different transmitter orientations in x direction and y and z directions.

This code is designed to compute the responses of Tri-Axial tool for transmitter in y and z. Another code is available in the same release to process source in x direction. The code uses the edge-based base, Frontal solver, and can handle frequency from several KHz to several MHz.

This code is a speed-up version of the forward simulation software for MWD logging tool response in tilted, horizontal formations with anisotropy.

Simulation of a conceptual 3-D electrode-type logging tool that can show, at each logging point, the formation resistivity for different radial depths at various azimuthal angles around the borehole.

This code is for automatic inversion of tri-axial induction logs in anisotropic beds, where borehole and invasion effects are ignored. This software is applicable to logs obtained in formations with dipping angle ranging from 0 to 85 degrees. The operating frequency and coil configuration of the tri-axial induction tool are known.

Modeling dual laterolog responses in fractured Formations.

This upgraded high speed edition of tri-axial induction code is designed to simulate responses of tri-axial induction sondes in dipping anisotropic bed. This is a 1-D code and therefore, borehole is neglected as well as invasion zones. The software is applicable to logs in formations with dipping angle ranging from 0 to 85 degrees. For dipping beds, each bed is characterized by six parameters: two conductivities, one in the bedding plane and one in the direction perpendicular to the bedding plane, two relative permittivities, and two magnetic permeabilities in corresponding directions. Each layer may have different conductivities, dielectric constants or magnetic permeabilities.

Finite element codes to simulate MWD resistivity sensors in 3-D environments.

Simulates induction sondes in cylindrically layered formations. The induction sonde is assumed located in a borehole  in a thick bed, facing up to 97 invasion zones. The borehole as well as each invasion zone is characterized by conductivity, dielectric constant and magnetic permeability. Useful in studying the effects of borehole, magnetic permeability, dielectric property and invasion profile on the readings of induction tools.

This inversion interface integrates forward and inversion interfaces so that users can use logging data to conduct inversion and use forward simulation to verify the inverted results.

Simulates MWD sondes in cylindrically layered formations. The MWD sonde is assumed located in a borehole  in a thick bed, facing up to 97 invasion zones. The borehole as well as each invasion zone is characterized by conductivity, dielectric constant and magnetic permeability. Useful in studying the effects of borehole, magnetic permeability, dielectric property and invasion profile on the readings of MWD tools.

Forward modeling of induction tools with tri-axial transmitting and receiving coils in 1-D anisotropic dipping beds.

Finite element codes to simulate induction resistivity sensors in 3-D environments.

Simulation of the time-varying invasion profiles in a permeable bed.

Version 4.0 upgrade. Based on feedback from industry users, this new version will implement many new features of display, input/output of logs, formation profiles, and commands. The new code for forward modeling of the tri-axial induction tools will be included in the menu.

3-D Transmission Line Matrix simulation tool in time domain: simulates logging tools including induction and MWD tools in a 3-D environment. It can simulate both isotropic and anisotropic formations. Both time domain and frequency domain results can be obtained.