Research and development of heavy oil viscosity reducer in China.
Among them, the emulsion viscosity reduction method in chemical medicine viscosity reduction method has been widely concerned. The application of down-hole emulsion viscosity reduction technology can improve the pump efficiency and the fluid surface of the oil well, reduce the power consumption, reduce the system pressure, and increase the output of crude oil in a single well. In high sand - bearing Wells, the pump speed is more coordinated due to the wettability of the emulsifier to vail.Therefore, the development of emulsifying viscosity reducer with low dosage and low cost has become one of the focuses.
The increased production depth of heavy oil and complicated geological conditions put forward the requirement of resistance to high temperature and mineral salt for emulsifying viscosity reducer. Although petroleum sulfonate is cheap and has been successfully applied in some oil fields, it is a anionic emulsifying viscosity reducer, so it has poor resistance to mineral salt.Although the combination of anionic and non-ionic surfactants can partially solve this problem, the "chromatographic" separation of emulsifying viscosity reducers of non-ionic and anionic complexes can occur in the stratum, and the properties and state of the complex system cannot be avoided.A new idea to improve the anti-salt ability of emulsifying viscosity reducer was put forward by the institute of petrochemical science.The copolycondensation content in 350 ℃ high temperature before and after treatment, the emulsification reduced adhesion effect without obvious change; In mineral water with calcium and magnesium ion concentration up to 2000 mg/l, the viscosity reduction rate is still above 90%, which is better than sulfonate or phosphate emulsion viscosity reducer, and similar products have LB viscosity
A kind of high temperature viscosity reducer for drilling fluid is developed abroad, which is a kind of chemical agent for oil field added in drilling fluid.
It is composed of methyl chlorosilane, modified by water soluble poly acrylonitrile, organotin catalyst and fluorinated alkyl siloxane, by heating, pressure reaction based liquid, then join the humic acid, the reaction under 150 ℃ ~ 180 ℃ for a quick drilling fluid with high temperature silicon fluoride drop goo.It has the characteristics of wide application range, high viscosity reduction, low aging, high temperature resistance, salt resistance, calcium resistance, high drilling speed, long maintenance period, non-toxic and pollution-free.Liaohe oilfield transportation of heavy oil dehydration method is first heated to 80 ℃, the middle line by heating and mixing with thin oil to maintain delivery, the cost is higher. Of 80 ℃ to reduce the cost of oil, in the first crude drug drop stick at a time, save intermediate heating station and thin oil, and on the way to maintain normal transportation, to the terminal station is generally not less than 50 ℃ temperature.The high colloid content is the main reason for the high viscosity and poor fluidity of the luodong extra heavy oil in liaohe river. Therefore, the key to solve the fluidity problem of the luodong extra heavy oil in liaohe river is to develop oil-soluble viscosity reducer which can form stronger hydrogen bond with the colloid to change the colloid and effectively reduce viscosity.