Effect of Pressure on Pyrolysis Characteristics of Four-Components of Tarim Crude Oil

doi:10.11944/j.issn.1000-0518.2017.10.160500

Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (10): 1202-1208.DOI: 10.11944/j.issn.1000-0518.2017.10.160500

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Effect of Pressure on Pyrolysis Characteristics of Four-Components of Tarim Crude Oil

ZHANG Qingxuan^a^*(),QU Xueli^b

^aCollege of Science,China University of Petroleum,Qingdao,Shandong 266580,China
^bTangshan Shanyou Silicon Industry Co,LTD,Tangshan,Hebei 063000,China

Received:2016-12-08 Accepted:2017-05-02 Published:2017-09-29 Online:2017-09-29
Contact: ZHANG Qingxuan
Supported by:
Supported by the Fundamental Research Funds for the Central Universities(No.09CX04030A), the State Key Laboratory of Heavy Oil Processing(No.F0904009-10)

Abstract

Abstract:

There are debates on the influence of pressures on chemical processes of crude oil in reservoirs. To investigate the effect of pressure on the pyrolysis of crude oil into gas in the reservoir, the compositions and contents of the gas products produced by pyrolysis reactions of four components separated from the Tarim crude oil and that of liquid products from saturates of Tarim crude oil under 450 ℃ and 5~40 MPa were analyzed by gas chromatography(GC) and GC mass spectrometry GC/MS, respectively. The results show that more gas is obtained in pyrolysis of asphaltene than resins, aromatics and saturates. The amount of C₁ in hydrocarbon gases generated by pyrolysis of the four-components is significantly higher than that of C₂~C₅ components. Increasing pressure decreases the yield of hydrocarbon gas generation in the pyrolysis process of asphaltene, resin and aromatics, but promotes the production of hydrocarbon gas in saturates pyrolysis. The liquid pyrolysis products transform to hydrocarbon compounds of low carbon numbers then to high carbon numbers with the pressure increase. The pyrolysis process is dominated by thermal cracking of the components in saturates under pressures less than 20 MPa. The study provides the theoretical reference for the crude oil stability and the natural gas formation in deep reservoirs.

Key words: four-components, crude oil, pyrolysis, high-pressure, gas yield

ZHANG Qingxuan, QU Xueli. Effect of Pressure on Pyrolysis Characteristics of Four-Components of Tarim Crude Oil[J]. Chinese Journal of Applied Chemistry, 2017, 34(10): 1202-1208.

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Effect of Pressure on Pyrolysis Characteristics of Four-Components of Tarim Crude Oil

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