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Journal Articles

Torsional Vibration of Drill String Induced by Heave Motion in Deepwater Drilling

Tatsuya Kaneko, Tomoya Inoue, Ryota Wada, Tokihiro Katsui, Hiroyoshi Suzuki
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. December 2025, 147(6): 061801.
Paper No: OMAE-24-1162
https://doi.org/10.1115/1.4067969
Published Online: March 18, 2025
View Article titled, Torsional Vibration of Drill String Induced by Heave Motion in Deepwater Drilling
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Topics: Drill strings, Vibration, Weight (Mass), Stick-slip, Underwater drilling, Oscillations, Torque
Proceedings Papers

Analytical and Numerical Study on Drill-String Torsional Vibration Under Weight-On-Bit Fluctuation

Tatsuya Kaneko, Tomoya Inoue, Ryota Wada, Tokihiro Katsui, Hiroyoshi Suzuki
Proc. ASME. OMAE2024, Volume 8: Offshore Geotechnics; Petroleum Technology, V008T11A004, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-125722
https://doi.org/10.1115/OMAE2024-125722
View Paper titled, Analytical and Numerical Study on Drill-String Torsional Vibration Under Weight-On-Bit Fluctuation
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Topics: Drill strings, Underwater drilling, Vibration, Weight (Mass)
Proceedings Papers

A Novel Approach of Data Science Incorporating Physical Knowledge for Early Stuck Pipe Detection

Tomoya Inoue, Tatsuya Kaneko, Yujin Nakagawa, Ryota Wada, Shungo Abe, Gota Yasutake
Proc. ASME. OMAE2024, Volume 8: Offshore Geotechnics; Petroleum Technology, V008T11A022, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-125728
https://doi.org/10.1115/OMAE2024-125728
View Paper titled, A Novel Approach of Data Science Incorporating Physical Knowledge for Early Stuck Pipe Detection
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Topics: Pipes
Proceedings Papers

Toward Efficient Infrastructure Development and Project Planning for Floating Offshore Wind Energy

Shintaro Sobashima, Ryota Wada, Lance Manuel
Proc. ASME. OMAE2024, Volume 7: Ocean Renewable Energy, V007T09A005, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-121696
https://doi.org/10.1115/OMAE2024-121696
View Paper titled, Toward Efficient Infrastructure Development and Project Planning for Floating Offshore Wind Energy
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Topics: Ocean engineering, Wind energy, Supply chains, Flow (Dynamics), Manufacturing, Simulation models, Transportation systems, Uncertainty, Wind farms
Proceedings Papers

Analytical, Numerical, and Field Data Investigation for Deriving the Condition of Stick-Slip Drill String Vibration

Tatsuya Kaneko, Tomoya Inoue, Ryota Wada, Tokihiro Katsui, Hiroyoshi Suzuki
Proc. ASME. OMAE2023, Volume 9: Offshore Geotechnics; Petroleum Technology, V009T11A047, June 11–16, 2023
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2023-102439
https://doi.org/10.1115/OMAE2023-102439
View Paper titled, Analytical, Numerical, and Field Data Investigation for Deriving the Condition of Stick-Slip Drill String Vibration
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Topics: Drill strings, Stick-slip, Vibration
Proceedings Papers

Early Stuck Pipe Detection Using Graph Attention Machine Learning

Tomoya Inoue, Yujin Nakagawa, Tatsuya Kaneko, Ryota Wada, Keisuke Miyoshi, Shungo Abe
Proc. ASME. OMAE2023, Volume 9: Offshore Geotechnics; Petroleum Technology, V009T11A004, June 11–16, 2023
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2023-101928
https://doi.org/10.1115/OMAE2023-101928
View Paper titled, Early Stuck Pipe Detection Using Graph Attention Machine Learning
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Topics: Machine learning, Pipes
Journal Articles

Estimation of Subsea Line Structure Behavior Based on Sequential Data Assimilation With Distributed Sensing

Shun Kojima, Ryota Wada, Hideaki Murayama
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. October 2023, 145(5): 051703.
Paper No: OMAE-22-1114
https://doi.org/10.1115/1.4056846
Published Online: February 28, 2023
View Article titled, Estimation of Subsea Line Structure Behavior Based on Sequential Data Assimilation With Distributed Sensing
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Topics: Ocean engineering, Parameter estimation, Sensors, Errors, Computer simulation, Particulate matter, Fibers
Proceedings Papers

Estimating Joint Extremes of Significant Wave Height and Wind Speed for Tropical Cyclones

Kosuke Sando, Ryota Wada, Jeremy Rohmer, Sophie Lecacheux, Philip Jonathan
Proc. ASME. OMAE2022, Volume 5B: Ocean Engineering; Honoring Symposium for Professor Günther F. Clauss on Hydrodynamics and Ocean Engineering, V05BT06A005, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-79888
https://doi.org/10.1115/OMAE2022-79888
View Paper titled, Estimating Joint Extremes of Significant Wave Height and Wind Speed for Tropical Cyclones
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Topics: Significant wave heights, Wind velocity, Engineering simulation, Indian Ocean, Modeling, Simulation
Proceedings Papers

Attempt of Early Stuck Detection Using Unsupervised Deep Learning With Probability Mixture Model

Tomoya Inoue, Yujin Nakagawa, Ryota Wada, Keisuke Miyoshi, Shungo Abe, Kouhei Kuroda, Hitoshi Tamamura, Hakan Bilen
Proc. ASME. OMAE2021, Volume 10: Petroleum Technology, V010T11A004, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-62739
https://doi.org/10.1115/OMAE2021-62739
View Paper titled, Attempt of Early Stuck Detection Using Unsupervised Deep Learning With Probability Mixture Model
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Topics: Machine learning, Pipes, Probability, Drilling, Artificial neural networks, Countermeasures, Support vector machines, Wells
Proceedings Papers

Experimental Identification of an Advanced Spar’s Low Frequency Drag Damping in Waves

Christopher Wright, Haruki Yoshimoto, Ryota Wada, Ken Takagi
Proc. ASME. OMAE2020, Volume 9: Ocean Renewable Energy, V009T09A072, August 3–7, 2020
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2020-19020
https://doi.org/10.1115/OMAE2020-19020
View Paper titled, Experimental Identification of an Advanced Spar’s Low Frequency Drag Damping in Waves
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Topics: Damping, Drag (Fluid dynamics), Waves, Hull, Renewable energy, Water, Wind, Climate change, Engineering simulation, Floating bodies
Proceedings Papers

Spatial Features of Extreme Waves in Gulf of Mexico

Ryota Wada, Philip Jonathan, Takuji Waseda
Proc. ASME. OMAE2020, Volume 6B: Ocean Engineering, V06BT06A007, August 3–7, 2020
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2020-19190
https://doi.org/10.1115/OMAE2020-19190
View Paper titled, Spatial Features of Extreme Waves in Gulf of Mexico
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Topics: Gulf of Mexico, Waves, Disks, Modeling, Risk, Significant wave heights, Uncertainty
Proceedings Papers

Attempt of a Real-Time Drilling State Identification With Machine Learning

Tomoya Inoue, Junya Ishiwata, Ryota Wada, Junichiro Tahara
Proc. ASME. OMAE2020, Volume 11: Petroleum Technology, V011T11A026, August 3–7, 2020
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2020-19169
https://doi.org/10.1115/OMAE2020-19169
View Paper titled, Attempt of a Real-Time Drilling State Identification With Machine Learning
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Topics: Drilling, Machine learning
Journal Articles

Assessment of Data-Inherited Uncertainty in Extreme Wave Analysis

Ryota Wada, Takuji Waseda
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. April 2020, 142(2): 021204.
Paper No: OMAE-18-1208
https://doi.org/10.1115/1.4045621
Published Online: February 6, 2020
View Article titled, Assessment of Data-Inherited Uncertainty in Extreme Wave Analysis
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Topics: Gulf of Mexico, Uncertainty, Waves, North Sea, Shapes
Proceedings Papers

Numerical Modelling of a Relatively Small Floating Body’s Wave and Low Frequency Motion Response, Compared With Observational Data

Christopher Wright, Haruki Yoshimoto, Ryota Wada, Ken Takagi
Proc. ASME. OMAE2019, Volume 9: Rodney Eatock Taylor Honoring Symposium on Marine and Offshore Hydrodynamics; Takeshi Kinoshita Honoring Symposium on Offshore Technology, V009T13A029, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-96443
https://doi.org/10.1115/OMAE2019-96443
View Paper titled, Numerical Modelling of a Relatively Small Floating Body’s Wave and Low Frequency Motion Response, Compared With Observational Data
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Topics: Modeling, Waves, Wind energy, Displacement, Ocean engineering, Seas, Approximation, Chain, Climate change, Computer simulation
Proceedings Papers

Estimating Extreme Waves in the Gulf of Mexico Using a Simple Spatial Extremes Model

Ryota Wada, Philip Jonathan, Takuji Waseda, Shejun Fan
Proc. ASME. OMAE2019, Volume 9: Rodney Eatock Taylor Honoring Symposium on Marine and Offshore Hydrodynamics; Takeshi Kinoshita Honoring Symposium on Offshore Technology, V009T13A007, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-95442
https://doi.org/10.1115/OMAE2019-95442
View Paper titled, Estimating Extreme Waves in the Gulf of Mexico Using a Simple Spatial Extremes Model
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Topics: Gulf of Mexico, Waves, Uncertainty, Modeling, Ocean engineering, Design, Manufacturing systems, Significant wave heights, Underpinning
Proceedings Papers

Combining Physics-Based and Data-Driven Models for Estimation of WOB During Ultra-Deep Ocean Drilling

Tatsuya Kaneko, Ryota Wada, Masahiko Ozaki, Tomoya Inoue
Proc. ASME. OMAE2018, Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology, V008T11A007, June 17–22, 2018
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2018-78229
https://doi.org/10.1115/OMAE2018-78229
View Paper titled, Combining Physics-Based and Data-Driven Models for Estimation of WOB During Ultra-Deep Ocean Drilling
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Topics: Physics, Underwater drilling, Drill strings, Drilling, Tension, Annulus, Artificial neural networks, Computer simulation, Displacement, Drills (Tools)
Proceedings Papers

Analytical Approach on Dynamic Tension of Free Hanging Configuration

Motoyasu Kanazawa, Ryota Wada, Masahiko Ozaki
Proc. ASME. OMAE2018, Volume 5: Pipelines, Risers, and Subsea Systems, V005T04A007, June 17–22, 2018
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2018-77361
https://doi.org/10.1115/OMAE2018-77361
View Paper titled, Analytical Approach on Dynamic Tension of Free Hanging Configuration
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Topics: Tension, Pipeline risers, Risers (Casting), Compression, Pipes, Water, Weight (Mass), Flexible risers, Maintenance, Polishing equipment
Proceedings Papers

Benchmark for the Sources of Uncertainty in Extreme Wave Analysis

Ryota Wada, Takuji Waseda
Proc. ASME. OMAE2018, Volume 3: Structures, Safety, and Reliability, V003T02A033, June 17–22, 2018
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2018-78216
https://doi.org/10.1115/OMAE2018-78216
View Paper titled, Benchmark for the Sources of Uncertainty in Extreme Wave Analysis
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Topics: Uncertainty, Waves, Gulf of Mexico, North Sea, Errors, Meteorology, Pacific Ocean, Seas
Proceedings Papers

On the Aleatory and Epistemic Uncertainty of the Wave Resource Assessment in the North West Pacific

Yusuke Kidoura, Ryota Wada, Takuji Waseda
Proc. ASME. OMAE2014, Volume 9B: Ocean Renewable Energy, V09BT09A046, June 8–13, 2014
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2014-24496
https://doi.org/10.1115/OMAE2014-24496
View Paper titled, On the Aleatory and Epistemic Uncertainty of the Wave Resource Assessment in the North West Pacific
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Topics: Pacific Ocean, Uncertainty, Waves, Seas, Arctic region, Oscillations, Wave energy, Climate, Emission spectroscopy, North Atlantic Ocean
Proceedings Papers

Consideration of Epistemic Uncertainty in Extreme Wave Height Estimation

Ryota Wada, Takuji Waseda
Proc. ASME. OMAE2014, Volume 1A: Offshore Technology, V01AT01A022, June 8–13, 2014
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2014-23364
https://doi.org/10.1115/OMAE2014-23364
View Paper titled, Consideration of Epistemic Uncertainty in Extreme Wave Height Estimation
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Topics: Significant wave heights, Uncertainty, Design, Gulf of Mexico, Offshore structures, Oceans, Waves