Shinji Yoneshima’s Post

View profile for Shinji Yoneshima, graphic

London Business School Sloan Fellow '24 | Ph.D. | PMP | Oil&gas/Automotive/AI | Seismologist/Geophysicist

This is one of my early works in the oil&gas industry more than a decade ago. https://lnkd.in/eaiSMtbp The LWD (Logging-While-Drilling) has the advantage of being capable of measuring the borehole physical properties (e.g. formation slowness) while drilling a wellbore. This LWD technology reduces the time&cost compared with the conventional Wireline measurement which deploys a measurement tool after the drilling which requires additional cost & time. The technology of LWD measurement was getting popular at that time and was getting more attention, but its technology was quite yet unmatured. This is partly because, as its name of the LWD suggests, the measurement of the formation slowness while drilling was extremely challenging (quite noisy because of a drilling noise, and banging noise etc). Accordingly, previously this work, the measurement of the shear slowness in the LWD condition was quite limited. In this work, for the first time in the oil&gas industry, a new technology was introduced to enable a robust slow shear measurement under the LWD condition. More importantly, not only this new technology gives a measurement robustness, it also allowed to extend the measurement range, meaning that it was a key enabler for a new formation measurement that could not be explored/assessed in this LWD technology (it was possible only in the Wireline measurement tools). I contributed, as a geophysicist/algorithm developer, to this work to establish an entire data processing workflow to solve an inverse problem* and its algorithm quality evaluation. At that time, the term of the Artificial Intelligence (AI) was not popular yet (no deep learning, but support vector machine in the machine learning was popular), but this kind of technical activity was more than AI, in the sense that everything should be white-box (i.e. explainable) with a rigorous validation process, including a failure and success of the measurement/processing. Now we have an AI in a various industry/daily use, and it is not difficult to develop/apply the AI if we don't need to take the quality/explainability into account or a research (it is inherently a black-box type of approach). But when it comes to the aplication to any mission-critical use cases, it is still quite a challenge. In this sense, I would say that AI is getting popular, but still its robustness/applicability is somewhat challenging as we previously faced with for the early LWD technology. In my next career endeavor, I will work for the AI. It will be my pleasure if I can dedicate myself to such AI challenges for various business scenes. *inverse problem: One field of mathematics/optimization problem. In this context, to extract a formation shear slowness from pressure sensor data based on a physics model in the wellbore.

Slow Formation Shear From An Lwd Tool: Quadrupole Inversion With A Gulf Of Mexico Example

Slow Formation Shear From An Lwd Tool: Quadrupole Inversion With A Gulf Of Mexico Example

onepetro.org

To view or add a comment, sign in

Explore topics