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Hosseini-Dastgerdi Z.,Sahand University of Technology | Tabatabaei-Nejad S.A.R.,Sahand University of Technology | Sahraei E.,Sahand University of Technology | Nowroozi H.,Petroleum Engineering and Development Company
Journal of Dispersion Science and Technology | Year: 2015

The size and morphology of asphaltene aggregates, precipitated from live oil by pressure depletion at the reservoir temperature was studied using scanning electron microscopy and atomic force microscopy. The experimental studies showed that the mean size of aggregates increased when pressure decreased. The results indicate that the morphology of aggregates was changed from amorphous spherical and elliptical shapes to irregular. A bimodal distribution function was able to describe the size distribution in pressure range of 500 to 3500 psi. At higher pressure, the unimodel was able to represent the size distribution. The results showed reduction in live oil stability and asphaltene aggregation with pressure drop. (Figure presented.). © 2015, Taylor & Francis Group, LLC.

Pour M.G.,Golestan University | Popov L.E.,National Museum of Wales | Hosseini M.,18 Hajarol Asvadi Alley | Adhamian A.,Petroleum Engineering and Development Company | Yazdi M.,University of Esfahan
Memoirs of the Association of Australasian Palaeontologists | Year: 2013

An asteropygine trilobite and brachiopod association, including new species Heliopyge sohensis and Leptagonia? lakhalensis, is described from the Soh area, north of Esfahan, Iran. The co-occurrence of Douvillina and Neocalmonia aff. quadricosta Pillet indicates a Frasnian age for the trilobite-bearing horizon. The underlying units of limestone (Bahram Formation equivalent) contain a diverse conodont assemblage characteristic of the upper Givetian hemiansatus to ansatus biozones. The faunal assemblage from Soh has an affinity to the contemporaneous faunas of Afghanistan, Chitral in Northern Pakistan and the eastern Pamir.

Dehghan A.,Petroleum University of Technology of Iran | Sedaee Sola B.,Petroleum University of Technology of Iran | Naderifar A.,Petroleum University of Technology of Iran | Gholampour E.,Petroleum Engineering and Development Company
Petroleum Science and Technology | Year: 2013

The application of steam injection in different forms of processes is widely used as thermal heavy oil recovery. Several studies have been carried out to evaluate the effect of injecting steam with gaseous additives such as hexane, nitrogen, carbon dioxide, methane, and propane. One of the most useful additives to steam is propane. The use of propane has been found to accelerate oil production due to dry distillation process in which light hydrocarbon fractions evaporated and carried by propane. In contact with cooler part of reservoir, light fractions condense and are miscible with oil. Therefore surface tension and oil viscosity are reduced. In this thesis, simulation studies of steam-propane injection were performed using seven pseudocomponent heavy oil model (12° API and 1820 c.p. viscosity at reservoir conditions). A 3-D Cartesian model was built to represent one-quarter a five-spot 10-acre pattern and 100 ft thickness. Steam and steam-propane were injected in reservoir conditions. The effect of some reservoir variables and operational parameters were investigated. The simulation results show that increasing horizontal permeability, injection rate, steam quality, and steam temperature in steam-propane injection process on single porosity reservoirs cause increasing of oil recovery factor, accelerating the start and peaks of oil production. © 2013 Copyright Taylor and Francis Group, LLC.

Ebadian H.,NIOC Exploration Directorate | Rabbani A.R.,Amirkabir University of Technology | Aminzadeh S.A.,Petroleum Engineering and Development Co.
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

This is a case study about evaluation of Ilam reservoir, one of the main oil reservoirs in most of the southwest oil fields of Iran, to find if there is any possibility to do a CO2 EOR project. Candidate oil field for doing this research is near to 3 power plants in southwest of Iran, which means that carbon capture is possible. From the geological point of view, because of the calm tectonics regime, the cap rock is complete and CO2 gas storage is possible. The Ilam reservoir conditions in oil fields of that area are approximately similar except the reservoir pressure. It depends to production history of the reservoir in each field. So, technology and strategy don't allow to do injection until pressure reduction over a long time production.

Mohebian R.,University of Tehran | Yari M.,University of Tehran | Riahi M.A.,University of Tehran | Vanaki M.R.,Petroleum Engineering and Development Co.
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

Seismic data, being non-stationary in nature, have varying frequency content in time. Time-frequency decomposition of a seismic signal aims to characterize the time-dependent frequency response of subsurface rocks and reservoirs. There are a variety of spectral decomposition methods; these include the Short Time Fourier Transform (STFT), Continuous Wavelet Transform (CWT) and Matching Pursuit Decomposition (MPD). In STFT, time-frequency resolution is fixed over the entire time-frequency space by preselecting a window length. Therefore, resolution in seismic data analysis becomes dependent on a user specified window length. The CWT dilates and compresses wavelets to provide a time-scale spectrum instead of a time-frequency spectrum. Converting a scalogram into a time-frequency spectrum using the center frequency of a scale gives an erroneous attenuation in the spectrum. Decomposition (MPD) do not involve windowing of the seismic data and thus have the best combination of temporal and spectral resolution as compared to STFT and the continuous wavelet transform (CWT). Castagna et al, 2003, used matching-pursuit decomposition for instantaneous spectral analysis to detect low-frequency shadows beneath hydrocarbon reservoirs. In this paper we analyze performance of matching pursuit method in mapping channel sediments at one of the south-west oil- field in Iran.

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