Results 21 to 30 of about 838 (163)

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  

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 quantitative description of gas-cut degree in deepwater drilling

Petroleum Exploration and Development, 2016
Through the analysis of gas-cut features in deepwater drilling and shortages of existing gas-cut detection methods, the feasibility of early detection of gas cut at the bottom of riser was demonstrated, and a method was proposed for quantitative ...
Yuqiang XU, Zhichuan GUAN, Huizeng ZHANG, Hongning ZHANG   +3 more
doaj   +1 more source

Numerical Investigation of Wellbore Stability in Deepwater Shallow Sediments

Geofluids, 2021
An elaborate poro-elastoplastic numerical model has been developed in this paper to explore the stability characteristics of wellbore in shallow sediments of deepwater oil/gas wells.
Wei Liu, Hai Lin, Hailong Liu, Chao Luo, Guiping Wang, Jingen Deng   +5 more
doaj   +1 more source

Wellbore multiphase flow behaviors during gas invasion in deepwater downhole dual-gradient drilling based on oil-based drilling fluid

Energy Reports, 2022
Knowledge of wellbore multiphase flow characteristics is important for early gas invasion identification and treatment, especially in oil-based drilling fluid.
Hongwei Yang, Jun Li, Geng Zhang, Hui Zhang, Boyun Guo, Wang Chen   +5 more
doaj   +1 more source

Study on Three-Dimentional Vibration Response Characteristics of Drilling String in Deepwater Riserless Drilling

Shiyou jixie, 2022
In deepwater riserless drilling system,drill string in seawater is affected by external ocean load,torque of top rotary table and bottom bit-formation force,so it is prone to vibrate in the three directions of longitudinal,transverse,and torsional,making
Liu Jun, Chen Feiyu, Li Jian, Guo Xiaoqiang   +3 more
doaj  

Methodology for kick tolerance calculation and well killing in deepwater drilling

Natural Gas Industry B, 2016
Kick tolerance is a key parameter to indicate whether shut-in operation can be carried out safely and a proper well killing method should be chosen in well drilling.
Yequan Jin, Cheng Li, Qian Wu
doaj   +1 more source

Bacteria-Oil Microaggregates Are an Important Mechanism for Hydrocarbon Degradation in the Marine Water Column

mSystems, 2021
Vast quantities of oil-associated marine snow (MOS) formed in the water column as part of the natural biological response to the Deepwater Horizon drilling accident. Despite the scale of the event, uncertainty remains about the mechanisms controlling MOS
Amanda M. Achberger, Shawn M. Doyle, Makeda I. Mills, Charles P. Holmes, Antonietta Quigg, Jason B. Sylvan   +5 more
doaj   +1 more source

Recoil Control of Deepwater-Drilling Riser with Optimal Guaranteed Cost H_∞ Control

Applied Sciences, 2022
In deepwater-drilling engineering, it is necessary to disconnect the bottom equipment of the lower marine-riser package from the blowout preventer when encountering multi-hazard environmental factors.
Yue-Ting Sun, Yan-Dong Zhao, Bao-Lin Zhang, Wei Zhang, Hao Su   +4 more
doaj   +1 more source

Gas kick and lost circulation risk identification method with multi-parameters based on support vector machine for drilling in deep or ultradeep waters

Engineering Science and Technology, an International Journal
In deepwater and ultra-deepwater drilling, formation pressures are complex and the drilling fluid density window is narrow, which makes it prone to well control incidents such as kicks and lost circulation.
Kai Feng, Shujie Liu, Zhiming Yin, Yi-long Xu, Meipeng Ren, Deqiang Tian, Bangtang Yin, Baojiang Sun   +7 more
doaj   +1 more source