Method for pipeline conveying technology of wax-containing crude added with viscocity and coagulation-reducing composition

Abstract

The invention relates to a method for a pipeline conveying technology of wax-containing crude added with a viscocity and coagulation-reducing composition, and relates to the technical field of petroleum industry and pipeline systems. The method for the pipeline conveying technology is characterized in that 1) the temperature of crude pretreatment is higher than the crude wax precipitation point; 2) the adding concentration of the viscocity and coagulation-reducing composition is 0.005wt%-0.05wt%; 3) the pretreatment final cold temperature of the added viscocity and coagulation-reducing composition crude is lower than the crude wax precipitation peak temperature; 4) the added viscocity and coagulation-reducing composition crude keeps a certain temperature reduction speed rate; 5) the adding temperature of the viscocity and coagulation-reducing composition is higher than the crude wax precipitation peak temperature; 6) the mixing of the wax-containing crude added with the viscocity and coagulation-reducing composition requires high-speed stirring; and 7) the reduplication heating temperature of the crude after treatment is lower than the crude wax precipitation point temperature. The method for the pipeline conveying technology of the wax-containing crude added with the viscocity and coagulation-reducing composition provided by the invention has the advantages of wide range of application, small low-temperature rheological impact caused by crude temperature recovery, good timeliness of dynamic and static state stability, less deposition of the crude in a pipeline, and more obvious viscocity reducing effect.

Description

technical field [0001] The invention relates to a process method for pipeline transportation of waxy crude oil plus a viscosity-decreasing and pour-point-decreasing composition. Involved in the field of petroleum industry and pipeline system technology. Background technique [0002] Most of the crude oil produced in my country is highly viscous, high-condensing, high-waxy crude oil. Due to the poor low-temperature rheological properties of this type of crude oil, most of my country's crude oil pipelines adopt the heating process. The heating and conveying process not only consumes a lot of fuel oil and power, but also there will be great unsafeness in restarting the pipeline after the pipeline is shut down. At the same time, some long-distance crude oil pipelines in my country are in low-volume operation. The capacity of pipeline heating facilities is insufficient. The energy consumption of pipeline operation increases and the safety decreases. Some pipelines have to adopt...

AI Technical Summary

Problems solved by technology

[0003] One is that the pour point depressants are targeted, and different types of pour point depressants are suitable for different crude oils. Up to now, no ideal pour point depressants have been found for Daqing oil;

[0004] Second, under comprehensive treatment conditions, the temperature rise of crude oil has a greater impact on low-temperature rheology, and there is a temperature rise deterioration area;

[0005] Third, the timeliness of dynamic and static stability after comprehensive treatment of waxy crude oil cannot meet the safe operation conditions of the pipeline;

[0006] Fourth, the addition of pour point depressant leads to an increase in the amount of wax deposited in the pipeline