Study And Application Of Crude Oil Nano-composite Demulsifier

The petroleum was one of the most important energy sources all over the world. The petroleum was exploited and formed emulsion included different amount water, which could not be directly applied and processed. It was necessary to separate the water completely from the petroleum emulsion before transporting or refining them. The method of demulsification included physical method and chemical method. Because the physical method was awkward to widespread industrializing application, the chemical agents(demulsifier) was used widely to separate the water completely from emulsion.A new method to confirm proper demulsifing temperature of crude oil emulsion by viscometric drop method was developed and was certified by Orthogonal experimental design. Apply inorganic nano-particle on polyether demulsifier to improve the demulsification performance of the original polyether demulsifier. Make nano-particle integrate with polyether demulsifier to form nano-composite demulsifier by direct dispersion method, surface graft method and In-situ synthesis method. The test result showed that the demulsification performance of the nano-composite demulsifier synthesized by In-situ synthesis method was the best. The nano-oxides were coated or cross linked by the macromolecule polyether demulsifier and the composite demulsifier was got. Experiment Testing showed that the ratio of demulsification would be improved 20% to 30% and the time of demulification and dewatering would be greatly shorten about 30 min with regular oil/water interface and clear separated water.The demulsification performance of the composite demulsifier synthesized by in-situ synthesis method in the field was very good. In Gudong Dongsilian when the treatment amount of emulsion increased but the dosage of composite demulsifier still was 250kg/d, water content in transported crude oil was <10% and meet the specification of Gudong Oil Production Plant. In Gudong Dongyilian when the condition of emulsion and oil content in transported water held the line, the dosage of composite demulsifier only was 30% of the dosage of organic macromolecule demulsifier, the reduction rates was about 70%. The test of dissociative water prolapsus implement in Gusilian showed that the oil content in transported water was above 2000mg/L before adding nano-composite demulsifier, when the dosage of nano-composite demulsifier was 300mg/L and treating time was 20min, the oil content in water flow from prolapsus implement was 130mg/L.The nano-composite demulsifier was charactered by FTIR, SEM, RAMAN and ~1H-NMR. The formation mechanism and demulsiflcation mechanism of nano-composite demulsifier were analyzed.