Study On The Relationship Of The Components Of Oilfield Produced Liquid With The Deemulsification

With the most major oil field entering the intermediary and later stage of exploitation reciprocally, a variety of enhanced oil recovery measures are used. And these measures introduced a large number of surfactants and polymers, which intensified the emulsification degree of produced oil. And this brings difficulties to the follow-up deemulsification of crude oil emulsion. The study on the effect of the crude oil components and additives to the stability and dehydration of crude oil emulsion, can provide a theoretical guidance on the deemulsification of crude oil.The Gudao 5# crude oil was separated into four components (saturated, aromatic, resin, asphaltene) by means of fluid-soild adsorption chromatogram.The composition of the components were studied through elementary composition analysis, molecular weight measurement, IR spectrum analysis. The result showed: the molecular weight of asphaltene is the largest, and the degree of unsaturation and content of hetero atom is highest in the four components; besides resin and asphaltene contain much nitrogenous and oxygenous chemical, and have relatively high activity.Through the experiment on the stability and deemulsification behavior of crude oil and components simulate emulsion, and the measurement of interfacial tension, the effect of the crude oil components and HPAM of different molecular weight and concentration on the stability and deemulsification of simulate emulsion was researched systematically. The result showed: the stability of simulate oil emulsion order was asphaltene, resin, oil without resin and asphaltene, asphaltene was the main active component; the effect of HPAM on crude oil and three components simulate oil showed different. Besides HPAM can result to thicker interface layer and bad water quality.The effect of HPAM on the oil-water interfacial tension of crude oil and components simulate emulsion was studied. The result showed: the oil-water interfacial tension decreased with the addition of HPAM. The interfacial tension between the kerosene solution of crude oil, resin, asphaltene and aqueous phase enhanced first then decreased with the concentration of HPAM (the same molecular weight) increasing. The interfacial tension can be remarkably reduced when the concentration of HPAM was in a certain scope, and when the concentration surpassed the scope, the interfacial tension started to elevate, since the adsorption of HPAM beginning to replace the active components in the interface.