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THEORETICAL SIMULATION AND EXPERIMENTAL STUDY OF THE INFLUENCE OF CO_2 INJECTION ON PVT OF CRUDE OIL

Guo Ping,Sun Liangtian,Li Shilun,Xiong Yu and Sun Lei(Southwest Petroleum Institute),Peng Pengshang and Yue Lu (Zhongyuan Petroleum Exploration and Development Research Institute).NATUR.GAS IND.v.20 no.2,pp.76~79,3/25/2000.(ISSN 1000 0976;In Chinese)  
As one of the important measures for evaluating the steam huff and puff test of an individual well,the expansion test has been applied in carbondioxide miscible flood test in oil fields.Although some studies about the changing law of the physical parameters of crude oil after carbon dioxide′s being injected have been made,yet the law is not very clear at present.In this paper,through matching the P-X diagram,expansion coefficients and original phase state parameters in the expansion test of CO 2 injection,the changing laws of the density,molecular weight and viscosity of the crude oil as well as the deviation factor and interfacial tension of the gas liquid phase at the bubble point after carbon dioxide′s being injected are calculated and the PV relation and the changing law of main characteristics in the multistage degassing are studied.
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