Asphaltene Prediction and Prevention: A Strategy To Control Asphaltene Precipitation
- Muhammad Ali Buriro (Universiti Teknologi Petronas) | Muhannad Talib Shuker (Universiti Teknologi Petronas)
- Document ID
- Society of Petroleum Engineers
- SPE/PAPG Annual Technical Conference, 3-5 December, Islamabad, Pakistan
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 5.2.2 Fluid Modeling, Equations of State, 3 Production and Well Operations, 4.1.5 Processing Equipment, 5.2 Reservoir Fluid Dynamics, 4.3.3 Aspaltenes, 5.1 Reservoir Characterisation, 5.4 Enhanced Recovery, 5.2.1 Phase Behavior and PVT Measurements, 1.2.3 Rock properties, 4.1.2 Separation and Treating, 5.5 Reservoir Simulation, 5.4.2 Gas Injection Methods, 2.5.2 Fracturing Materials (Fluids, Proppant), 1.8 Formation Damage, 1.6.9 Coring, Fishing
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Asphaltene Precipitation and Deposition is a serious problem which can reduce the oil recovery by reducing reservoir permeability and altering the wettability. It can plug wells and flow lines through deposition and also cause separation difficulties at the separation facilities. Taking preventive measures are always a wise solution rather than attempting to resolve issues when they are occurred.
This study proposes a strategy and provides the comprehensive review of the methodology required to predict and prevent Asphaltene Precipitation.
Light crude oil samples were taken to be characterized for their thermodynamic properties. The saturation pressure and Asphaltene Onset Point (AOP) were measured at different pressures, temperatures and compositional changes using the Solid Detection System (SDS). Phase diagram and Asphaltene Precipitation Envelopes (APE) were developed. Cubic Plus Association (CPA) equation of state was used to develop the Asphaltene phase envelope using Multiflash (infochem). Titration technique was used to obtain the AsphalteneFloculation point (AFP) using the dead oil and n-Heptane as a precipitant. Effect of different inhibitors was then evaluated using the Solid Detection System (SDS) equipment using the titration technique. Rock-Inhibitor Compatibility was then checked in the reservoir core samples by performing the dynamic core flooding test in the laboratory.
Conclusively, this strategy helps to enhance the reservoir performance by minimizing the asphaltene precipitation and will save the cost associated with the consequences of high asphaltene precipitation.
Asphaltene is a complex fraction of crude oil which is normally defined as a solubility class rather than chemical. Asphaltene is insoluble in n-alkanes but soluble in aromatics such as benzene or toluene . It is a semi solid material which is precipitated from the crude oil upon the change in composition, pressure or temperature. Asphaltene instability which causes precipitation is unrelated to the amount of asphaltene in the crude oil. However, Asphaltene stability depends on the properties of asphaltene itself and the properties of the rest of the fractions of crude oil. 
|File Size||245 KB||Number of Pages||11|