Results 21 to 30 of about 180,228 (166)

Influence of Auxiliary Pipelines of the Deepwater Drilling Riser on the Dynamic Characteristics of the Subsea Wellhead

Journal of Marine Science and Engineering, 2023
During deepwater drilling, the subsea wellhead will be subjected to dynamic loads transmitted from the marine environment, floating drilling platform, riser, and blowout preventer (BOP).
Jinduo Wang, Yanbin Wang, Deli Gao, Rui Li, Liurui Guo   +4 more
doaj   +1 more source

Measurement of laser absorptivity for operating parameters characteristic of laser drilling regime [PDF]

, 2008
Publisher version : http://iopscience.iop.org/0022-3727/41/15/155502/Laser drilling in the percussion regime is commonly used in the aircraft industry to drill sub-millimetre holes in metallic targets.
SCHNEIDER, Matthieu, BERTHE, Laurent, FABBRO, Rémy, MULLER, Maryse   +3 more
core   +1 more source

Study on Flow Regulation and Bottom Hole Pressure Control of RMR System under Normal Working Conditions

Shiyou jixie, 2022
For lack of deepwater drilling technology and theory, riseless mud recovery system(RMR)is difficult to meet practical requirements. Therefore, according to the double gradient drilling principle of RMR system, the control equation of bottom hole pressure
Zhang Jie, Wang Zhiheng, Li Xin, Li Cuinan, Li Rongxin, Sun Ruitao   +5 more
doaj  

Refined Assessment on Vortex-induced Fatigue of Deepwater Subsea Wellhead

Shiyou jixie, 2022
Subsea wellhead is the key equipment for deepwater drilling and vortex-induced fatigue failure is prone to occur under the action of ocean current.Present research mainly focuses on the global vortex-induced fatigue analysis of deepwater drilling riser ...
Huang Yi, Liu Shujie, Meng Wenbo, Liu Hexing, Li Lei, Tong Wujun, Liu Xiuquan   +6 more
doaj  

Risk-based Reliability Assessment of Subsea Control module for Offshore Oil and Gas production [PDF]

, 2014
Offshore oil and gas exploitation is principally conducted using dry or wet tree systems, otherwise called the subsea Xmas tree system. Due to the shift to deeper waters, subsea production system (SPS) has come to be a preferred technology with ...
Umofia, Anietie Nnana
core   +5 more sources

Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid

Applied Sciences, 2017
In deepwater oil and gas drilling, the high-molecular-weight encapsulator aggravates the thickening of the drilling fluid at low temperatures. Therefore, it is hard to manage the downhole pressure, and drilling fluid loss occurs.
Xin Zhao, Zhengsong Qiu, Yongjun Zhang, Hanyi Zhong, Weian Huang, Zhichuan Tang   +5 more
doaj   +1 more source

THE VIOLENCE OF FULL COST RECOVERY: Financing Water Infrastructure, and the History and Future of Perpetual Crisis in Mombasa

International Journal of Urban and Regional Research, EarlyView.
Abstract Foregrounding the role of finance, this article examines the historical production and future trajectory of the urban water crisis in Mombasa. Drawing on archival research and contemporary fieldwork, it traces how principles of full cost recovery—institutionalized during the colonial period and later reworked through postcolonial ...
Joe Williams
wiley   +1 more source

Hawaii Scientific Drilling Project 1993 [PDF]

, 1994
Content: Project Summary, History of Hawaii Project, Permit History, Continental Scientific Drilling Office's Role, Setup and Coring of Kahi Puka Site, Downhole Problems, Cures for Problems, Conclusions, Appendices: Correspondence for Increase in Depth ...

core   +3 more sources

Chironomid‐based summer temperature reconstruction of the Eemian–Weichselian transition at Lichtenberg, northern Germany

Boreas, EarlyView.
Understanding the temperature variability of past interglacial cycles is essential to predict future climates. We present a new summer temperature reconstruction, based on the subfossil chironomid record from a small palaeolake adjacent to the Middle Palaeolithic site of Lichtenberg, northern Germany. The record spans from the Saalian late glacial over
Sonja Rigterink, Bartosz Kotrys, Michael Hein, Xuan Li, Neda Rahimzadeh, Agnieszka Gruszczyńska, Marcel Weiss, Brigitte Urban, David Colin Tanner, Tobias Lauer, Antje Schwalb   +10 more
wiley   +1 more source

Mechanisms of Low Temperature Thickening of Different Materials for Deepwater Water-Based Drilling Fluids

Gels
During deepwater drilling, the low mudline temperatures and narrow safe density window pose serious challenges to the safe and efficient performance of deepwater water-based drilling fluids.
Zhongyi Wang, Jinsheng Sun, Kaihe Lv, Xianbin Huang, Zhenhang Yuan, Yang Zhang   +5 more
doaj   +1 more source