Results 61 to 70 of about 311 (133)

Fluid Flow Simulation for Predicting Bottomhole Pressure That Considers Wellbore Storage Effects Under Shut-In Conditions in Deepwater Drilling

Journal of Marine Science and Engineering
Under shut-in conditions in deepwater drilling, the gas invading the bottomhole ascends along the wellbore and accumulates at the wellhead, forming a high-pressure trap, challenging wellbore pressure prediction and control.
Yanli Guo, Yonghai Gao, Qingtao Gong, Lifen Hu, Yongyi Jiang, Baojiang Sun   +5 more
doaj   +1 more source

Genetic Diversity and Population Structure of Squalus cf. mitsukurii (Chondrichthyes: Squalidae) Revealed by ddRAD Sequencing

Animal Genetics, Volume 57, Issue 2, April 2026.
ABSTRACT Assessing genetic structure across ocean basins is essential to understand connectivity and guide conservation in data‐deficient open‐water sharks. In this study, we examined the population genomics of Squalus cf. mitsukurii by analyzing tissue samples collected from two distant regions: California, USA (Pacific Ocean) and Pernambuco, Brazil ...
Aisni Mayumi Corrêa de Lima Adachi, Ailton Amarante Ariza, Giovana da Silva Ribeiro, Pollyana Christine Gomes Roque, Matheus Marcos Rotundo, Marcelo Vianna, Gabriela Delpiani, Sergio Matias Delpiani, Juan Martín Díaz de Astarloa, Claudio Oliveira, Fausto Foresti, Vanessa Paes da Cruz   +11 more
wiley   +1 more source

Late Eocene to Early Oligocene (36–26 Ma) Rock Magnetism and Magnetostratigraphy of IODP Site U1553, Southwestern Pacific: Defying the Challenges of Carbonate Dilution and Reductive Diagenesis

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract The late Eocene to early Oligocene is an intriguing Paleogene period in which the Earth climate state changed from Warmhouse to Coolhouse. Accurate age models are essential for investigating these climate transitions. The southwestern Pacific International Ocean Discovery Program (IODP) Site U1553, with its almost complete succession of the ...
Yang Zhang, Wanzhang Wang, Tilo von Dobeneck, Anna Joy Drury, Thomas Frederichs, Wei Yuan   +5 more
wiley   +1 more source

Salt-Resistant Lubricant for Deep Water Drilling Fluids

Zuanjingye yu wanjingye
In deepwater drilling, drilling fluids are affected by seawater, highly mineralized brine, and polyvalent metal ions. Conventional lubricants such as mineral oils, vegetable oils, and fatty acids often exhibit poor dispersion and incompatibility in high ...
Xiaodong LIU, Yongle MA, Tao LIU, Yong ZHANG, Qingyong LI, Ningzi LUO   +5 more
doaj   +1 more source

Prediction and risk assessment of natural gas hydrate formation in deepwater wellbores

You-qi chuyun, 2020
Hydrate formed in the wellbore during deepwater shallow drilling will affect the operation safety, so it is necessary to predict and analyze the hydrate formation range and degree in the wellbore annulus.
Jingyi SHI, Jianchun FAN, Shengnan WU, Lei LI   +3 more
doaj   +1 more source

Stochastic Facies Modeling of the Lower‐Burdekin Delta Aquifer Based on Lithological Interpretation From Legacy Boreholes

Water Resources Research, Volume 62, Issue 4, April 2026.
Abstract The spatial heterogeneity of aquifer properties plays an important role in the movement of groundwater and contaminants. The characterization of heterogeneity from field observations is often needed to develop groundwater models used to inform management decisions.
Guillaume Pirot, Dylan J. Irvine, S. Cristina Solórzano‐Rivas, Adrian D. Werner   +3 more
wiley   +1 more source

Mechanical Analysis of Deepwater Drilling Riser During Inter-Well Towage in Batch Drilling and Completion Operations: A Case Study from Stabroek Block, Guyana

Journal of Marine Science and Engineering
In deepwater oil and gas development, conventional well-by-well drilling and completion involve repeated equipment deployment, resulting in low efficiency.
Lu Guo, Chao Fu, Ying Zhao, Jin Yang, Lei Li, Haoyu Wang, Li He   +6 more
doaj   +1 more source

Interference analysis and operability envelopes design for deepwater parallel strings

Oil & Gas Science and Technology, 2019
Dual derrick operations are widely used for field development during offshore drilling. During this process, complex operations and complicated hydrodynamic interaction may contribute to the interference collisions of parallel strings.
Zhu Jingyu, Liu Kang, Chen Guoming, Zhu Gaogeng   +3 more
doaj   +1 more source

Study on Drill String Fatigue Life in Deepwater Drilling

Shiyou jixie, 2016
Dynamic response of the deepwater drilling platform increases alternating loads of the drilling string.As a consequence,the calculation of drill string fatigue life becomes more complicated.By using the numerical simulation method,a method for studying ...
Wang Jiajia, Chen Jianmin
doaj  

Dual-Gradient Drilling and Riserless Mud Recovery Technology: A Review of Principles, Progress, and Challenges

Journal of Marine Science and Engineering
Deepwater drilling operations face critical challenges including narrow pore-fracture pressure windows, wellbore instability, and environmental concerns from drilling discharge.
Rongrong Qi, Hongfeng Lu, Zhibin Sha, Fangfei Huang, Yan Li, Zhiyuan Luo, Jinsong Lu   +6 more
doaj   +1 more source