Pore Scale Representation of Near Wellbore Damage due to Asphaltene Deposition: Effect of Sand Grain Size and the Presence of Clay in Reservoir Rock
- Andreas Prakoso (Texas A&M University) | Abhishek Punase (Texas A&M University) | Berna Hascakir (Texas A&M University)
- Document ID
- Society of Petroleum Engineers
- SPE Heavy Oil Conference and Exhibition, 6-8 December, Kuwait City, Kuwait
- Publication Date
- Document Type
- Conference Paper
- 2016. Society of Petroleum Engineers
- 4 Facilities Design, Construction and Operation, 1.8 Formation Damage, 4.3.4 Scale, 4.3.3 Aspaltenes, 4.3 Flow Assurance, 1.2.3 Rock properties
- Effect of Clay, Asphaltene Deposition
- 2 in the last 30 days
- 143 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 5.00|
|SPE Non-Member Price:||USD 28.00|
The near wellbore damage due to asphaltenes deposition is one of the major flow assurance issues currently faced by the petroleum industry. This study examines the pore scale flocculation and deposition processes of asphaltenes onto rock matrices. The effect of sand-grain size, clay presence in the reservoir rock, crude oil type, and precipitated asphaltenes type on the depositional behavior of asphaltenes is investigated. The porous media is prepared using sands with two different grain sizes or using sand-clay mixtures. Reservoir rocks were fully saturated with two different oil samples. 8 samples was prepared and they were washed by using either n-pentane or n-heptane, which are known as asphaltene insoluble solvents. In total, 16 experimental samples washed with solvents were subjected to optical microscopy and Scanning Electron Microscopy (SEM) – Energy Dispersive Spectroscopy (EDS) analyses to assess the asphaltene depositional mechanism. For all cases, porosity variations were measured experimentally. Our results suggest that asphaltene-clay interaction can increase the near-wellbore damage due to the strong polar ends in asphaltenes which are attached to clay surfaces and/or asphaltenes that are stuck in clay layers. Porosity of the sand has been found to decrease after the injection of solvents, indicating pore blockage due to asphaltene deposition. While the n-pentane precipitated more asphaltenes than n-heptane, n-heptane asphaltenes occupied more volume and resulted in higher porosity reduction due to higher polarity of n-heptane asphaltenes than n-pentane asphaltenes. Furthermore, the presence of clays and non-uniformity of grain sizes are observed to aggravate formation damage by asphaltenes. The SEM images showed that the interaction of clays with asphaltenes mainly reduces the permeability rather than porosity. The EDS analyses indicate that the impurity content of asphaltenes affect mainly the interaction of asphaltenes and clays.
|File Size||1 MB||Number of Pages||9|
Andersen, S.I., Speight, J.G. 1999. Thermodynamic Model for Asphaltene Solubility and Precipitation. Journal of Petroleum Science and Engineering 22 (1-3): 53–66. DOI: 10.1016/S0920-4105(98)00057-6.
Burke, N.E., Hobbs, R.E., Kashou, S.F. 1990. Measurement and Modeling of Asphaltene Precipitation. Journal of Petroleum Technology 42 (11): 1440–1446. SPE-18273-PA. DOI: 10.2118/18273-PA.
Coelho, R.S.C., Ovalles, C., Benson, I.P., Hascakir, B. Clay-Asphaltene Interaction during Hybrid Solvent-Steam Injection into Bitumen Reservoirs. Presented at SPE Canada Heavy Oil Technical Conference, 7-9 June 2016, Calgary, Alberta, Canada, SPE-180723-MS. DOI: 10.2118/180723-MS.
Crocker, M.E., Marchin, L.M. 1988. Wettability and Adsorption Characteristics of Crude-Oil Asphaltene and Polar Fractions. Journal of Petroleum Technology 40 (04): 470–474. SPE-14885-PA. DOI: 10.2118/14885-PA.
Demir, A.B., Bilgesu, H.I., Hascakir, B. The Effect of Clay and Salinity on Asphaltene Stability. Presented at SPE Western Regional Meeting, 23-26 May, 2016, Anchorage, Alaska, USA. SPE-180425-MS. DOI: 10.2118/180425-MS.
Hammami, A., Phelps, C.H., Monger-McClure, T., Little, T.M. 2000. Asphaltene Precipitation from Live Oils: An Experimental Investigation of Onset Conditions and Reversibility. Energy Fuels 14 (1): 14–18. DOI: 10.1021/ef990104z.
He, L., Li, X., Wu, G., Lin, F., Sui, H. 2013. Distribution of Saturates, Aromatics, Resins, and Asphaltenes Fractions in the Bituminous Layer of Athabasca Oil Sands. Energy & Fuels 27(8), 4677–4683. DOI: 10.1021/ef400965m.
Kar, T., Mukhametshina, A., Unal, Y., Hascakir, B. 2015. The Effect of Clay Type on Steam-Assisted-Gravity-Drainage Performance. Journal of Canadian Petroleum Technology. SPE-173795-PA. 10.2118/173795-PA. DOI: 10.2118/173795-PA.
Klein, J.C., Hercules, D.M. 1983. Surface Characterization of Model Urushibara Catalysts. Journal of Catalysis 82 (2): 424–441. DOI: 10.1016/0021-9517(83)90209-9.
Morris, K.A., Shepperd, C.M. 1982. The Role of Clay Minerals in Influencing Porosity and Permeability Characteristics in the Bridport Sands of Wytch Farm, Dorset. Clay Minerals 17 (1): 41–54. DOI: 10.1180/claymin.1982.017.1.05
Neasham, J.W. 1977. The Morphology of Dispersed Clay in Sandstone Reservoirs and its Effect on Sandstone Shaliness, Pore Space and Fluid Flow Properties. Presented at SPE Annual Fall Technical Conference and Exhibition, Denver, Colorado, 9-12 October. SPE-6858-MS. DOI: 10.2118/6858-MS.
Prakoso, A.A., Punase, A.D., Hascakir, B. A Mechanistic Understanding of Asphaltene Precipitation from Varying Saturate Concentration Perspective. Presented at SPE Latin American and Carribean Petroleum Engineering Conference, 18-20 November, 2015, Quito, Ecuador. SPE-177280-MS. DOI:10.2118/177280-MS.
Prakoso, A.A., Punase, A., Klock, K., Rogel, E., Ovalles, C., Hascakir, B. 2016. Determination of the Stability of Asphaltenes through Physicochemical Characterization of Asphaltenes. Presented at SPE Western Regional Meeting, 23-26 May, Anchorage, Alaska, USA. SPE-180422-MS. DOI: 10.2118/180422-MS.
Punase, A.D., Prakoso, A.A., Hascakir, B. The Polarity of Crude Oil Fractions Affects the Asphaltenes Stability. Presented at SPE Western Regional Meeting, 23-26 May 2016, Anchorage, Alaska, USA, SPE-180423-MS. DOI: 10.2118/180423-MS.
Sim, S.S.K., Okatsu, K., Takabayashi, K., Fisher, D.B. 2005. Asphaltene-Induced Formation Damage: Effect of Asphaltene Particle Size and Core Permeability. Presented at SPE Annual Technical Conference and Exhibition, Dallas, Texas, 9-12 October. SPE-95515-MS. DOI: 10.2118/95515-MS.
Speight, J.G., Long, R.B., Trowbridge, T.D. 1984. Factors Influencing the Separation of Asphaltenes from Heavy Petroleum Feedstocks. Fuel 63: 616–620. DOI: 10.1016/0016-2361(84)90156-X.
Srivastava, R.K., Huang, S.S. 1997. Asphaltene Deposition During CO2 Flooding: A Laboratory Assessment. Presented at SPE Production Operations Symposium, Oklahoma City, Oklahoma, 9-11 March. SPE-37468-MS. DOI: 10.2118/37468-MS.
Unal, Y., Kar, T., Mukhametshina, A., Hascakir B. The Impact of Clay Type on the Asphaltene Deposition during Bitumen Extraction with Steam Assisted Gravity Drainage, Presented at International Symposium on Oil Field Chemistry, 13-15 April 2015, The Woodlands, Texas, USA, SPE-173795-MS. DOI: 10.2118/173795-MS.
Wilson, M.D., Pittman, E.D. 1977. Authigenic Clays in Sandstones: Recognition and Influence on Reservoir Properties and Paleoenvironmental Analysis Journal of Sedimentary Petrology 47 (1): 3–31. DOI: 10.1306/212F70E5-2B24-11D7-8648000102C1865D.