Integrated method for thin oil blending, viscosity reduction, extraction and transportation of thickened oil

Abstract

The invention relates to an integrated method for thin oil blending, viscosity reduction, extraction and transportation of thickened oil, which is used for extracting, gathering and transporting the thickened oil of an oil field. By using the method, the viscosity of the thickened oil can be reduced, the flowing resistance can be reduced, and the output of the thickened oil can be improved. The method adopts the technical scheme that firstly, an organic solvent is blended into a pit shaft and automatically mixed with the thickened oil according to a mass ratio of 1.0 to 1.5 of the solvent to the thickened oil, so as to reduce the viscosity of the thickened oil; secondly, the thickened oil blended with the organic solvent is output to the outside of the pit shaft, is heated to a temperature of 50 DEG C to 150 DEG C through a heat exchanger and a heating furnace, and then enters a distillation tower fractionally distilled, and the organic solvent is output from the tower top, cooled to 0 DEG C to 30 DEG C through the heat exchanger, and transported back to the pit shaft for cycle use by using a pipe; and thirdly, the fractionally distilled thickened oil is output from the tower bottom and cooled through the heat exchanger, then thin oil is blended into the thickened oil to be mixed with the thickened oil according to a mass ratio of 0.3 to 0.4 of the thin oil to the thickened oil, and the oil is directly transported out after the viscosity is reduced. According to the method, the organic solvent blended into the pit shaft can be completely recycled for use; the method is suitable for ordinary thickened oil, special thickened oil and super thickened oil, and has high adaptability; and besides, by using the method, the use amount of the thin oil is greatly reduced, the utilization rate of the thin oil is increased, and the cost is reduced.

Description

Technical field [0001] The invention relates to an integrated production and transportation method for thick oil blending and viscosity reduction for heavy oil exploitation, gathering and transportation in the petroleum industry. technical background [0002] With the development of my country's petroleum industry and the increasing shortage of domestic energy, the volume of heavy oil production is increasing. Heavy oil refers to degassed crude oil with a viscosity greater than 100 mPa·s at the temperature of the oil layer, but it is usually above 1000 mPa·s. The production of heavy oil with high gum and asphaltene in my country accounts for about 7% of crude oil production. These heavy oils have outstanding characteristics such as high viscosity, high density, and poor fluidity. The high viscosity of heavy oil is mainly caused by the entanglement of soluble bitumen particles. During the production and gathering of heavy oil, the fluidity of crude oil in the wellbore and surfac...

AI Technical Summary

Problems solved by technology

However, the mass ratio of thin oil to heavy oil is as high as 1.2-1.5:1. A large amount of thin oil leads to the problem of insufficient supply of thin oil. The thick oil after thinning not only reduces the quality of thin oil but also reduces the quality of heavy oil.

CN1598393A reported an integrated method for heavy oil viscosity reduction, collection, and transportation. The thick oil that has been reduced in viscosity by using a diluent must undergo chemical methods such as thermal cracking to meet the viscosity requirements, but there are complex technological processes, energy consumption and operating temperature. High, and the high cost of viscosity reduction

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