Sound field forward modeling numerical simulation method and system based on axisymmetric finite difference

Through the numerical simulation method of sound field forward performance based on axisymmetric finite difference, the problem of large calculation amount and low solution speed in the prior art is solved, and efficient and stable wellbore sound field response simulation is achieved, which is suitable for complex models.

CN119720619APending Publication Date: 2025-03-28CHINA NAT PETROLEUM CORP +1
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Patent Information

Application Number
CN202311273259.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the prior art, when the forward performance numerical simulation method realizes the wellbore sound field response simulation in complex models, the calculation amount is large, the solution speed is low, the applicability and stability are insufficient.

Method used

A numerical simulation method for the forward performance of the sound field based on axisymmetric finite difference is adopted. By obtaining the geometric and material parameters of the user model, dividing the interleaved grid, and iterating the finite difference to obtain the stress value and velocity field value of the receiving point.

Benefits of technology

It improves computing efficiency, reduces the requirements for equipment, increases convergence, and is suitable for media with arbitrary Poisson's ratio. It has small grid dispersion, good stability, and improves calculation accuracy.

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Abstract

The invention discloses a sound field forward modeling numerical simulation method and system based on axisymmetric finite difference, and belongs to the field of oil exploration and development. According to the method, a speed component and a stress component are distributed on a space grid in a staggered mode by using a staggered grid division mode in time and space, and aiming at the characteristics of a numerical model under the well condition, small grids are used around a borehole, and large grids are used in other media for dispersion. Performing initialization processing and boundary setting on the model parameters through the set wellbore parameters, performing time domain finite difference solution based on the initialized parameters and the set boundary, and quickly outputting a stress value and a velocity field value. The sound field response mechanism and rule are reflected through the stress value and the velocity field value, an efficient and stable numerical simulation tool is provided for design and research and development of an acoustic logging instrument, and an important supporting effect is achieved for research of an acoustic logging method.
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