Pipeline transportation method for easy-condensing high-viscous crude oil after degraded by microorganism

Abstract

The invention relates to a method for degrading congealable and highly-viscous crude oil by using microbes and feeding the crude oil through a pipeline, which comprises following steps: (1) mixing G3 solution of Pseudomonas, B5 solution of Bacillus and Y2 solution of Corynebacterium with a weight ratio of (1-6):(2-5):(2-4), and stirring completely to obtain a compound bacterial solution with a pH value within 4.0 to 8.0 and a concentration of 10<6> to 10<9> counts / ml; (2) preparing a nutrient solution from honey 0.1 to 5%, (NH4)2SO4 0.1 to 1%, MgSO4*7H2O 0.001 to 0.2%, K2HPO4 0.001 to 5%, and water allowance by mixing uniformly; (3) mixing the compound bacterial solution with the nutrient solution at a ratio of 1:(2-40) to obtain a mixture solution; (4) mixing the mixture solution with the crude oil at a ratio of (1-5):1, reacting with the microbes at 35 to 70 DEG C for 70 to 200 h while stirring with a stirring speed of 1-600 rpm, dehydrating to a water content of 1 to 10%, and feeding the crude oil in the pipeline at a temperature higher than the congealing point of the crude oil by 1 to 10 DEG C; and (5) pumping a portion of the crude oil back to a tank through the pipeline, the volume ratio of the pumped crude oil to the crude oil in the tank being 1:(4-20). The method is simple and remarkable.

Description

technical field [0001] The invention relates to a method for pipeline transportation of petroleum crude oil, in particular to a method for pipeline transportation after using microorganisms to degrade easily condensable high-viscosity crude oil. Background technique [0002] Usually condensable high-viscosity crude oil includes paraffin-based crude oil with high wax content, often called waxy crude oil, and heavy crude oil with high colloid and asphaltene content and high density, often called thick crude oil. At present, most of the crude oil produced in Daqing, Shengli, Zhongyuan, South China Sea and other major oilfields in my country is high waxy crude oil. Shengli, Liaohe, Xinjiang, Bohai and other oilfields have a large amount of heavy oil, and the newly discovered 100 million-ton Bohai Penglai Oilfield is also heavy oil. In oil fields, high-viscosity crude oil accounts for more than 80% of the crude oil produced in my country. [0003] The traditional crude oil transp...

AI Technical Summary

Problems solved by technology

At present, most of the pour point depressants used in oil fields are chemical agents, mainly alkylnaphthalene, polyolefin, and polyester chemical substances. In my country's Shengli, Zhongyuan, Xinjiang, Changqing and other oil fields, more than 10 pipelines have adopted pour point depressants. This technology has played an extremely important role in the safe operation of petroleum pipeline transportation, energy saving and consumption reduction. However, this technology is restricted by many properties of petroleum itself, and the effect of pour point depressing is very unstable. Moreover, long-term use of these chemical depressants The coagulant has great pollution to the environment

[0005] At present, there have been related reports on the technology and advantages of microbial oil recovery in domestic and foreign literature, but there has been no report on the application of the advantages of microbial pour point reduction and viscosity reduction to oil pipeline transportation.

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