The principle of demulsifier in demulsifying the crude oil produced fluid
1. Disrupting the interfacial film by demulsifier additive using demulsifier for oilfield crude treatment.
1).Adsorption and substitution
The emulsifiers in the crude oil produced fluid form a stable interfacial film that prevents the separation of oil and water. Demulsifier for oilfield crude treatment can adsorb onto the oil-water interface with their special molecular structure, partially replace the original emulsifiers. For example, some demulsifier additive molecules have stronger polar head groups and a greater affinity for the oil-water interface. Their adsorption on the interface changes the properties of the interfacial film, making it fragile.
2).Rupture of the film by demulsifying additive.
--Demulsifier additive molecules continuously adsorb and accumulate on the interfacial film, reducing the strength and toughness of the interfacial film.
--During the flow, agitation or heating of the crude oil produced fluid, the fragile interfacial film is prone to rupture, allowing the originally emulsified small oil droplets to coalesce with each other.
2. Flocculation effect in oilfield use demulsifier additive. 1). Charge neutralization when oilfield use demulsifier additive. --Some demulsifier additive can neutralize the charges on the surface of oil droplets. In the crude oil produced fluid, the surface of oil droplets may carry a negative charge. When the cationic components in the demulsifier additive interact with the charges on the surface of oil droplets, the charges are neutralized. For example, some demulsifier for oilfield containing amines can provide cations, reducing the electrostatic repulsion between oil droplets and facilitating their approach and subsequent flocculation. 2).Bridging effect using demulsifier fast acting. --Demulsifier fast acting molecules may have long carbon chains or molecular structures that can interact with multiple oil droplets simultaneously, connecting the oil droplets like a bridge. -- This bridging effect promotes the aggregation of oil droplets to form larger aggregates,accelerating
the demulsification process.
3.Solubilization effect in oilfield use demulsifier additive. Solubilization of emulsifier additive -- In oilfield use demulsifier product that molecules can form micelles and these micelles can solubilize the emulsifier molecules in the crude oil produced fluid. -- When emulsifiers are solubilized into the micelles of demulsifiers, the concentration of emulsifiers on the oil-water interface decreases, and the stability of the interfacial film is disrupted, thereby promoting the demulsification of crude oil.
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