Drill Bit Source Focusing With Multiplicative Seismic Imaging
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Solution Overview
Problem
Traditional seismic imaging techniques for drill bit location yield noisy, low-resolution subsurface images with high uncertainty, making accurate drill bit localization challenging, especially in seismic-while-drilling (SWD) data with low signal-to-noise ratio (SNR).
Innovation Solution
Utilizing seismic-while-drilling data with a waveform-based migration and a multiplicative imaging condition to enhance coherent events and suppress noise, promoting sparsity in the drill bit image, thereby improving spatial resolution and accuracy of drill bit localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional seismic imaging techniques are used for drill bit location, then the imaging process is simple, but the spatial resolution and accuracy are low with noisy images
Solution Approach 1:
The patent changes the imaging condition parameter from traditional summation to multiplicative imaging condition. This parameter change transforms the imaging process to promote sparsity and enhance coherent events, directly improving drill bit location accuracy and spatial resolution while managing the increased computational complexity through efficient implementation
Solution Approach 2:
The patent replaces traditional travel time-based mechanical picking methods with waveform-based migration and multiplicative imaging conditions. This substitution eliminates the need for exhaustive and accurate picking of direct arrivals, improving measurement precision while the computational approach manages the complexity trade-off
2Measurement precision
If waveform-based migration with multiplicative imaging condition is used, then spatial resolution and accuracy are improved, but the computational complexity increases
Solution Approach 1:
The patent applies multiplicative imaging conditions instead of traditional summation conditions. This parameter change in the imaging algorithm promotes sparsity of the drill bit image and enhances coherent events, achieving high-resolution imaging with reduced uncertainty while the efficient computational implementation manages the algorithmic complexity
3Manufacturing precision
If traditional summation imaging condition is used, then the processing is simpler, but the drill bit image has low resolution with high uncertainty
Solution Approach 1:
The patent changes the imaging condition from summation to multiplicative type. This parameter change promotes sparsity in the drill bit image, enhances coherent events, and eliminates random noise, directly improving image resolution and reducing uncertainty while the computational approach manages the increased complexity
Data Source
AI summary
A computer implemented method that enables drill bit source focusing is described. The method includes obtaining, using at least one hardware processor, correlated drill bit gathers comprising a direct arrival from a downhole source to surface receivers; identifying, using the at least one hardware processor, at least one window around first breaks in the correlated drill bit gathers captured by the surface receivers, wherein the first breaks are isolated/bounded the at least one window; redatuming, using the at least one hardware processor, seismic data within the at least one window captured by respective surface receivers to generate source images; and generating, using the at least one hardware processor, a seismic migration image by multiplying the generated source images.