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Peptize

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Journal Articles
SPE Prod & Oper 4 (04): 371–375.
Paper Number: SPE-16230-PA
Published: 01 November 1989
.... Asphaltenes, aromatic-based hydrocarbons of amorphous structure, are present in crude oils as colloidally dispersed particles. 2,3 These hydrocarbons are generally found in greater quantity in lower API-gravity crude. Asphaltenes are peptized or suspended in the oil by lower-molecular-weight neutral resins...
Proceedings Papers

Paper presented at the SPE Production Operations Symposium, March 13–14, 1989
Paper Number: SPE-18894-MS
... in crude oil as a colloidal suspension. The asphaltic resins surround the asphaltene molecule in their micelle and provide the peptization. As long as the micelle remains intact, the peptization. As long as the micelle remains intact, the asphaltenes are not problems. The factors mentioned earlier...
Proceedings Papers

Paper presented at the SPE Production Operations Symposium, March 8–10, 1987
Paper Number: SPE-16230-MS
.... These hydrocarbons are found in greater quantity the lower the API gravity of a crude. Asphaltenes are peptized or surrounded by lower molecular weight neutral resins (maltenes) and aromatic hydrocarbons. Only a small percentage of the formation damage related to hot oiling is related to asphaltenes. This type...
Proceedings Papers

Paper presented at the SPE Oilfield and Geothermal Chemistry Symposium, April 9–11, 1985
Paper Number: SPE-13561-MS
... Abstract The adsorption of various polysaccharides on peptized montmorillonite is examined and peptized montmorillonite is examined and their influence on the fluid loss properties of polymer-modified bentonite drilling mud (14 lb/bbl) formulations is studied as a function of increasing...
Journal Articles
SPE J. 24 (03): 283–293.
Paper Number: SPE-11202-PA
Published: 01 June 1984
.... This reduces the aggregation of asphaltenes, which determines to a large extent their solubility in crude oil. The most common model for asphaltene/resin interaction is the colloidal model. Asphaltene micelles (aggregates) are assumed to be kept in solution (stabilized or peptized) by a layer of resins ("onion...
Proceedings Papers

Paper presented at the SPE California Regional Meeting, April 9–11, 1980
Paper Number: SPE-8895-MS
... these particles that are capable of complexing vanadium or nickle ions present in most crudes. Early investigators have established that the high molecular weight asphaltene particles in crude are stabilized as colloids via peptization by the lower molecular weight resinous components. Speight and Moschopedis...
Journal Articles
OIJ 2020 (05): 56–59.
Paper Number: OIJ-2020-05-056-059-RU
Published: 01 May 2020
... by an increase in the concentration of the solid phase, the aggression of electrolytes and an increase in temperature. These factors determine the different forms and levels of coagulation processes. When the solution is heated, the peptization of clay particles increases, but the viscosity of the dispersion...
Images
Physical appearances of AlO(OH)-SPCA solutions at different preparation sta...
Published: 30 January 2014
Fig. 1 Physical appearances of AlO(OH)-SPCA solutions at different preparation stages. Bottles from left to right represent the synthesis steps mentioned in text. (a) Initially formed AlO(OH) particles; (b) Peptized AlO(OH) NPs; (c) Mixture of AlO(OH) NPs and SPCA; (d) AlO(OH)-SPCA NPs after More
Proceedings Papers

Paper presented at the SPETT 2012 Energy Conference and Exhibition, June 11–13, 2012
Paper Number: SPE-158106-MS
... it is understood they may behave as resins peptizing the asphaltene particles and keeping them in solution. To ensure the validity of this investigation, extensive bibliographical reviews were undertaken, followed by numerous laboratory tests such as SARA analysis, Cloud Point Tests and Wax Content Tests...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 4–7, 1981
Paper Number: SPE-10101-MS
... removed by centrifugation. The peptized bentonite was dispersed and isolated three times from deionized water using high speed centrifugation. The final peptized bentonite suspension was prepared under high shear (Waring blender). The amount of deflocculated bentonite in the final suspension...
Proceedings Papers

Paper presented at the SPE/EAGE Reservoir Characterization and Simulation Conference, October 19–21, 2009
Paper Number: SPE-125567-MS
... of models. 3,8–10 Colloidal models in which, asphaltene is suspended in crude oil and peptized by resins. The asphaltene precipitation is irreversible in such models. 11–13 Reversibility experiments are strongly against this type of models. Models based on scaling equation, in which the properties...
Proceedings Papers

Paper presented at the Canadian International Petroleum Conference, June 16–18, 2009
Paper Number: PETSOC-2009-039
... such models. Reversibility experiments strongly support this type of models [3,8-10]. (II) Colloidal models in which, asphaltene is suspended in crude oil and peptized by resins. The asphaltene precipitation is irreversible in such models [11-13]. Reversibility experiments are strongly against this type...
Proceedings Papers

Paper presented at the Canadian International Petroleum Conference, June 16–18, 2009
Paper Number: PETSOC-2009-147
... is viewed as the most polar and highest molecular weight fraction of the crude oil. The chemical structure of asphaltene has been the subject of many studies.2 ,3 These investigations reveal that asphaltenes are stabilized in oil by the resin molecules which act as peptizing agent for emulsifying asphaltene...
Images
Physical appearances of AlOOH-SPCA solutions at different preparation stage...
Published: 08 April 2013
Figure 1 Physical appearances of AlOOH-SPCA solutions at different preparation stages. Bottles from left to right represent the synthesis steps mentioned in text. a: Initially formed AlOOH particles; b: Peptized AlOOH NPs; c: Mixture of AlOOH NPs and SPCA; d: AlOOH-SPCA NPs after sonication; e More
Proceedings Papers

Paper presented at the Canadian International Petroleum Conference, June 17–19, 2008
Paper Number: PETSOC-2008-028
..., containing heteroatom (i.e. S, O, N) and metals (e.g. Va, Ni) that exist in petroleum fluids in an aggregated state 1 . These aggregates are stabilized in solution by resins and aromatics, which act as peptize agents 2 . Asphaltenes and resins, are in the thermodynamic equilibrium at static reservoir...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 24–27, 2006
Paper Number: SPE-102129-MS
.... Asphaltenes are contained in crude oils in the form of a colloidal dispersion. Amorphous in structure, the asphaltene micelle consists of higher molecular weight compounds surrounded and peptized by neutral resins and aromatic hydrocarbons. The micelle consists of sheets of polycyclic rings containing 6–14...
Proceedings Papers

Paper presented at the Canadian International Petroleum Conference, June 13–15, 2006
Paper Number: PETSOC-2006-074
... typical visbreaking conditions, conversion of naphtenic VR's is limited to around 30 % (w/w). At this conversion level product stability reaches a minimum critical value, commonly expressed by a peptization parameter (P-value) ~ 1.1 (4) . Instable molecules are the result from recombination of aromatic...
Journal Articles
SPE Prod & Oper 20 (02): 126–132.
Paper Number: SPE-84609-PA
Published: 01 May 2005
...Saad F. Al-Kafeef; Fahed Al-Medhadi; Ali Dughaim Al-Shammari Summary The natural state of asphaltenes in petroleum fluids is described as a colloidal system stabilized, to some extent, by the resins that act as peptizing agents. Destabilization of colloidal asphaltenes appears to happen as a result...
Journal Articles
SPE Prod & Oper 19 (03): 152–160.
Paper Number: SPE-87638-PA
Published: 01 August 2004
... early models were based were never grounded in scientific fact. 5 Speculations that asphaltenes were coated with a peptizing layer of resins and that flocculation occurs during titration with n -alkanes because the resins are diluted shed no light on flocculation during depressurization. Asphaltenes...
Journal Articles
SPE Prod & Oper 18 (04): 247–256.
Paper Number: SPE-87088-PA
Published: 01 November 2003
... in the form of colloidal dispersions and are stabilized in solution by resins and aromatics that act as peptizing agents. Asphaltene precipitation and deposition may occur deep inside the reservoir, near the wellbore, and/or in processing facilities. 1–4 It was evident from preliminary analyses of wellhead...

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