Results 171 to 180 of about 1,915 (207)

Efficient Modelling of Asphaltene Precipitation

SPE Annual Technical Conference and Exhibition, 1993
AbstractAn efficient modelling technique based on the representation of the precipitated asphaltene as a pure dense phase is presented. The success of the approach is based on the division of the heaviest component in the oil into a non-precipitating and a precipitating component. The characterization of these components is discussed.
L. X. Nghiem, M. S. Hassam, Ram Nutakki, A. E. D. George   +3 more
openaire   +1 more source

Thermodynamic modelling of asphaltene precipitation and related phenomena

Advances in Colloid and Interface Science, 2015
Asphaltenes are considered to be the heaviest and most polar fractions of crude oils and are frequently implicated in problems encountered during production and refining as a result of phase separation. In recent years, considerable effort has been given to understanding the phase behaviour of these structurally heterogeneous materials from both ...
Forte, E, Taylor, SE
openaire   +4 more sources

The Role Of Acid-Additive Mixtures On Asphaltene Precipitation

SPE Eastern Regional Meeting, 1978
Introduction Asphaltene precipitation is currently undergoing a major observation by the petroleum industry due to the problem it can create, such as the reduction of fluid flow passages. In particular, this could include the reduction of formation permeability.
Timothy Knobloch, Farouq S.M., J. Diaz, Manuel   +2 more
openaire   +1 more source

Interrelationships between Asphaltene Precipitation Inhibitor Effectiveness, Asphaltenes Characteristics, and Precipitation Behavior during n-Heptane (Light Paraffin Hydrocarbon)-Induced Asphaltene Precipitation

Energy & Fuels, 2004
Three carefully chosen chemicalsdodecylbenzenesulfonic acid (DDBSA), nonyl phenol (NP), and toluenewere studied for their asphaltene precipitation inhibition effectiveness during light-paraffin-hydrocarbon-induced asphaltene precipitation of three Saskatchewan crude oils, as well as to evaluate possible interrelationships between their inhibition ...
Hussam H. Ibrahim, Raphael O. Idem
openaire   +1 more source

INFLUENCE OF TEMPERATURE AND SOLVENT ON THE PRECIPITATION OF ASPHALTENES

Fuel Science and Technology International, 1990
ABSTRACT Asphaltenes has been precipitated from a Kuwait flash residue using different n-alkanes (n-C5 to n-C8) at various temperatures ranging from 4°C to reflux temperatures of the used precipitants. Structures in the asphaltene fractions has been revealed using U.V. fluorescence spectroscopy, elemental analysis and to some extent 1H-nmr.
Simon I. Andersen, Kulbir S. Birdi
openaire   +1 more source

Theory of asphaltene precipitation in a hydrocarbon cyclone

Minerals Engineering, 2007
Abstract Asphaltenes are a variety of semi-polar hydrocarbon species found in many crude oils worldwide. They make up a significant weight of the bitumen (up to 19%) found in the Canadian oil sands deposits near Fort McMurray. This deposit is the largest known oil reservoir in the world.
D.N. Madge, W.N. Garner
openaire   +1 more source

Prediction of asphaltene precipitation in crude oil

Journal of Petroleum Science and Engineering, 2009
Abstract Asphaltene are problematic substances for heavy-oil upgrading processes. Deposition of complex and heavy organic compounds, which exist in petroleum crude oil, can cause a lot of problems. In this work an Artificial Neural Networks (ANN) approach for estimation of asphaltene precipitation has been proposed.
G. Zahedi, A.R. Fazlali, S.M. Hosseini, G.R. Pazuki, L. Sheikhattar   +4 more
openaire   +1 more source

Formation Damage by CO2-Induced Asphaltene Precipitation

SPE International Symposium and Exhibition on Formation Damage Control, 2006
Abstract To increase productivity from crude oil reservoirs, carbondioxide (CO2) is usually injected during secondary and/or tertiary recovery. While CO2 injection significantly increases the amount of oil recovered, it causes asphaltene deposition at high concentrations.
openaire   +1 more source

Modeling Asphaltene Precipitation in Reservoir Simulation

Industrial & Engineering Chemistry Research, 2000
Asphaltene precipitation is a serious problem during oil recovery processes. Many models have been developed to predict the precipitation. This paper summarizes these precipitation models and implements the model of Nghiem et al. in The University of Texas Compositional simulator to predict the effects of asphaltene precipitation on fluid flow through ...
Xiangjun Qin, Peng Wang, Kamy Sepehrnoori, Gary A. Pope   +3 more
openaire   +1 more source

Asphaltene Flocculation, Precipitation, and Liesegang Ring

Energy & Fuels, 2004
Precipitations of Ratawi and Kuparuk asphaltene in toluene/heptane mixed solvents were investigated using a newly developed dripping test method.
Fabricio Arteaga-Larios, Eric Y. Sheu, Elias Pérez   +2 more
openaire   +1 more source