Results 51 to 60 of about 2,972,520 (248)

Lost circulation in drilling: Mechanisms, materials, and future directions for HPHT and energy-transition wells

Unconventional Resources
Lost circulation is one of the most persistent and costly challenges in drilling operations, particularly under high-pressure and high-temperature conditions and in fractured carbonate reservoirs. Despite decades of research, no universal solution exists,
Ali Mahmoud, Rahul Gajbhiye
doaj   +1 more source

Biodegradable 3D‐Printable and Coatable Antifouling Composites for Marine Applications

Advanced Functional Materials, EarlyView.
Marine biofouling damages submerged surfaces and raises greenhouse gas emissions. Biodegradable antifouling biocomposites were developed by hot‐mixing beeswax, Tween 80, and calcium stearate or stearic acid. Adjusting the component ratio enables processing via hot‐pressing, 3D‐printing, or dip‐coating.
Gabriele Corigliano, Lorenzo Ravelli, Martina Nardi, Ruowen Tu, Elena Bellini, Valerio Isa, Carlo Filippeschi, Roberta Finazzi, Luca Ceseracciu, Niloofar Paknezhad, Vincenzo Scribano, Paolo Galli, Silvia Lavorano, Simone Montano, Barbara Mazzolai, Marco Contardi, Pietro Cataldi, Athanassia Athanassiou   +17 more
wiley   +1 more source

Design and evaluation of lost circulation materials for severe environments [PDF]

, 1988
An independent analysis of lost circulation materials for geothermal applications has been completed using unique laboratory tools developed for the purpose.
Wright, E. K., Loeppke, G. E., Glowka, D. A.   +2 more
core  

Hemocompatible Glycogen‐Tissue Plasminogen Activator Complexes for Enhanced Blood Clot Dissolution

Advanced Healthcare Materials, EarlyView.
Glycogen–heparin‐cRGD nanoparticles enable targeted delivery of tissue plasminogen activator (tPA) to thrombi through activated platelet recognition. The hemocompatible hybrids minimize interactions with blood and immune cells while retaining enzymatic biodegradability.
Nadiia Davydiuk, Vaidehi Londhe, Susanne Boye, Martin Müller, Carsten Werner, Manfred F. Maitz, Quinn A. Besford   +6 more
wiley   +1 more source

Enhanced loss of circulation prediction using Sea Lion-optimized machine learning models

Unconventional Resources
Lost circulation is a major drilling challenge that increases cost and non-productive time and is influenced by different parameters. This study develops and evaluates machine learning models for predicting lost circulation severity during drilling ...
Seyed Hossein Hashemi, Majid Mohajeri, Farshid Torabi, Saman Azadbakht   +3 more
doaj   +1 more source

The effect of storms on the Antarctic Slope Current and the warm inflow onto the southeastern Weddell Sea continental shelf [PDF]

Ocean Science
Storms have been suggested to drive enhanced southward transport of modified Warm Deep Water (mWDW) towards the Filchner Ice Front in the southern Weddell Sea. This region is a known location of dense bottom water production and is thus tightly linked to
V. Dundas, V. Dundas, K. Daae, E. Darelius, M. Janout, J.-B. Sallée, S. Østerhus   +6 more
doaj   +1 more source

State-Of-The-Art Review of Lost Circulation Materials and Treatments - Part I: General Trends and Uses

, 2019
One of the major problems facing the oil and gas industry is the problem of lost circulation. Millions of dollars are spent every year to treat this problem. Lost circulation can be occurred due to high permeability, natural fractures, induced fractures,
Rusul A. Mutar, Al-Bazzaz, Waleed H., Waleed H. Al-Bazzaz, Shari Dunn-Norman, Al-Alwani, Mustafa A., Dunn-Norman, Shari, Husam H. Alkinani, Abo Taleb Al-Hameedi, Mustafa A. Al-Alwani, Al-Hameedi, Abo Taleb T., Alkinani, Husam H., Mutar, Rusul A.   +11 more
core   +1 more source

Advanced Materials for Biologics Delivery to Brain Tumors

Advanced Materials, EarlyView.
Material innovation is central to unlocking the therapeutic potential of biologics against many central nervous system diseases, including brain cancer. By engineering carriers with controlled transport, targeting, and release properties, advanced materials can overcome the blood–brain barrier and tumor microenvironment, improving the delivery of ...
Yuran Feng, Yuxue Cao, Maria Kavallaris, Taskeen Janjua, Amirali Popat   +4 more
wiley   +1 more source

Mixing energy analysis of Bingham plastic fluids for severe lost circulation prevention using similitude [PDF]

, 2006
As the demand for oil and gas resources increases, the need to venture into more hostile environments becomes a dynamic focus in the petroleum industry. One problem associated with certain high risk formations is lost circulation.
Massingill, Robert Derryl, Jr.
core   +2 more sources

Sample class balancing based on borderline-SMOTE for lost circulation recognition

Journal of Petroleum Exploration and Production Technology
During complex oil and gas drilling, minor lost circulation is a common yet hard-to-monitor downhole incident, and its accurate detection facilitates the timely implementation of on-site well control measures to mitigate economic losses caused by such ...
Weifeng Sun, Chentao Gong, Saisai Bu, Dongyue Wang, Weimin Huang   +4 more
doaj   +1 more source