Results 251 to 260 of about 35,311 (304)

Ethylene–Vinyl Acetate Copolymer and Resin-Stabilized Asphaltenes Synergistically Improve the Flow Behavior of Model Waxy Oils. 1. Effect of Wax Content and the Synergistic Mechanism

, 2018
Both polymeric pour point depressants (PPDs) and asphaltenes can improve the flowability of waxy oils. However, the effect of polymeric PPDs together with asphaltenes on the flowability of waxy oils is not clear.
Bo Yao, Chuanxian Li, Fei Yang, Xiaoping Zhang, Zhonghua Mu, Guangyu Sun, Yansong Zhao   +6 more
semanticscholar   +1 more source

Surface Interaction of Water-in-Oil Emulsion Droplets with Interfacially Active Asphaltenes.

Langmuir, 2017
Adsorption of interfacially active components at the water/oil interface plays critical roles in determining the properties and behaviors of emulsion droplets.
Chen Shi, Ling Zhang, Lei Xie, Xi Lu, Qingxia Liu, Jiajun He, César A. Mantilla, F. G. A. van den Berg, Hongbo Zeng   +8 more
semanticscholar   +1 more source

A Mesoscopic Model for an Asphaltene and Complex Mixtures of Asphaltenes

Petroleum Science and Technology, 2015
A representation for an asphaltene system and asphaltene mixtures is proposed based on experimental data reported by Socrates et al. These were modeled at the mesoscopic level by applying dissipative particle dynamics (DPD), where DPD beads correspond to the main structure that constitutes the real asphaltene fraction.
openaire   +2 more sources

Squalene in Petroleum Asphaltenes

Science, 1981
Squalene, 2,6,10,15,19,23-hexamethyl-2,6,10,14,18,22-tetracosahexaene, a new biological marker, has been detected in various petroleum asphaltenes and their pyrolysis products. Since squalene is the most common triterpenoid in nature and the biological precursor of the important tetra- and pentacyclic triterpane markers, its detection in asphaltene ...
Douglas S. Montgomery, N. Samman, Otto P. Strausz, Teresa Ignasiak, C. J. Chen   +4 more
openaire   +3 more sources

Effect of Asphaltene Concentration on the Aggregation and Precipitation Tendency of Asphaltenes

Energy & Fuels, 2014
Destabilized asphaltenes can easily adhere to the oil well production equipment, the transportation pipelines, and also the refining and storage facilities, resulting in significant remediation costs. Therefore, it is of great importance to the energy industry to understand the factors that govern the kinetics of asphaltene aggregation and ...
Haji-Akbari Nasim, Teeraphapkul Phitsanu, Fogler H. Scott   +2 more
openaire   +3 more sources

Asphaltenes Adsorption onto Metal Oxide Nanoparticles: A Critical Evaluation of Measurement Techniques

, 2018
The adsorption of asphaltenes onto nanoparticles (NPs) has received a lot of attention in recent years. However, the effect of the measurement technique on the adsorption isotherms has never been addressed.
N. L. Ezeonyeka, A. Hemmati-Sarapardeh, M. Husein   +2 more
semanticscholar   +1 more source

Systematic Investigation of Asphaltene Deposition in the Wellbore and Near-Wellbore Region of a Deepwater Oil Reservoir Under Gas Injection. Part 1: Thermodynamic Modeling of the Phase Behavior of Polydisperse Asphaltenes

Energy & Fuels, 2019
Thermodynamic modeling is conducted for a high-asphaltene, high-resin crude oil produced from a deepwater reservoir using the perturbed-chain statistical associating fluid theory (PC-SAFT).
Mohammed I. L. Abutaqiya, Caleb J. Sisco, Jianxin Wang, F. Vargas   +3 more
semanticscholar   +1 more source

Stability and Aggregation of Asphaltenes in Asphaltene−Resin−Solvent Mixtures

Energy & Fuels, 2004
The Integral Equation Theory (IET) of fluids and molecular dynamics (MD) simulations have been used to study the stability and aggregation of asphaltenes in asphaltene−resin mixtures with different host solvents (n-heptane, toluene, and pyridine).
Y. Duda, † and F. Guevara-Rodriguez, C. Lira-Galeana, ⊥ A. Ortega-Rodriguez   +3 more
openaire   +2 more sources

Interaction Mechanism of Oil-in-Water Emulsions with Asphaltenes Determined Using Droplet Probe AFM.

Langmuir, 2016
Emulsions with interface-active components at the oil/water interface have long been of fundamental and practical interest in many fields. In this work, the interaction forces between two oil droplets in water in the absence/presence of asphaltenes were ...
Chen Shi, Ling Zhang, Lei Xie, Xi Lu, Qingxia Liu, César A. Mantilla, F. G. A. van den Berg, Hongbo Zeng   +7 more
semanticscholar   +1 more source

Asphaltenes: The Cholesterol of Petroleum

Proceedings of Middle East Oil Show, 1995
ABSTRACT Asphaltene precipitation and deposition has been recognized to be a significant problem in oil production, transmission, and processing facilities. The precipitation of asphaltenes is caused by a number of factors including changes in pressure, temperature, chemical composition of the crude oil, mixing the oil with diluents or ...
Selim G. Sayegh, Sunil Kokal
openaire   +2 more sources