The Dual Of A Certain Temperature Range Within The Continuous Phase Of Crude Oil Rheology Research

The traditional method to research the stability and rheologic behavior of crude oilwas that we measure the rheological curve by rheometer and then screen the bestviscosity reducer. It would be regarded as the viscosity to reduce if the rheologychange of crude oil followed the rule of the shearing stress thinning. The crude oilswe studied were the representative Sudan acid heavy oil and Venezuela high viscosityheavy oil. Because the crude oils came from the overseas by air parcel, and eachbarrel (25kg) cost 10,000 dollars;the crude oil would be aging and its propertychanging and the study reliability would fall if we transported it by ship, which need 3months. Based on the traditional method, we introduced a new method of microscopeanalytic method in order to reduce the research cost and enhance the study reliability.We found that it could use less oil but screen the best viscosity reducer faster bymicroscope analytic method. This could make our country in the strong status in theworld.We have introduced an effective method to research the crude oils which camefrom abroad and were difficult to get so we screen the viscosity reducer fast and savethe crude oil sample.In view of the heavy oil mining resistance major problem, we studied crude oilemulsification dispersion system by mixing water to high viscosity crude oil in thecertainly temperature range (30 ℃ -70 ℃) which formed the stable bicontinuousphase. This work had solved the mining problem of the world famous acid heavy oilfrom Sudan six area and extra-heavy oil from Venezuelan MP3 oil field;In view ofhigh friction from gathering pipeline to refinery, we studied crude oil reduce its pourpoint and viscosity by itself without mixing with water. This work had solved thepipeline transports of extra-heavy oil, containing Sudan six area's, Sudan 37 area'sand Venezuelan MP3's. The best temperature-viscosity curve and time-viscosity curvewere refered to avoid the emulsion reversed-phase in the course of reducing theviscosity of crude oil.The main work and contributions of this paper are as follows:1. We mixed water into crude oil to form a stable bicontinuous phase in the certainlytemperature range. The characteristic of watered viscosity reducing is adding littlewater, no convert phase and high security index, so it was welcomed by oil field. Theextra-heavy crude oil of Venezuela at normal temperature is block. They added 20%diesel oil to reduce viscosity for exploitation. If using normal chemical agent toreduce viscosity it will need 40% active water, but we can do it by adding 25% activewater.2. The heavy oil can reduce its pour point and viscosity using oil-soluble Pour PointDepressants and Viscosity Reducers without mixing with water. This work solved theproblem of pipeline transports.3. Using microscope to study the stability and rheology of emulsion in order to saveoil sample. Moreover it can exactly screen better viscosity reducer.4.Using microscope to study the rule of variety viscosity of crude oil frommicrostructure.5. The best temperature-viscosity curve and time-viscosity curve were refered toavoid the emulsion reversed-phase in the course of reducing the viscosity of crude oil.