Phase behavior characteristics of near-critical oil and gas reservoirs in Tarim Basin
Received date: 2019-07-09
Revised date: 2019-10-31
Online published: 2020-03-26
Supported by
The Youth Fund of National Natural Science Foundation of China(51604043)
The phase behavior of near critical fluid is very complex, and the similar properties of volatile oil or condensate gas result in the difficulties to judge whether it is an oil reservoir or a gas reservoir by conventional methods. Two types of near critical formation fluids, Zhonggu 43 well area and Well Jinyue 201, Tarim Basin, are studied. By observing the near-critical "emulsion phenomenon", different methods such as gas-oil ratio, phase diagram, density and composition are used to judge the types of oil and gas reservoirs. By comparing different methods, the near-critical fluid types can be judged accurately by combining the fluid image and dimensionless pressure curve method during testing. The Zhonggu 43 well area of Tazhong 1 Gas Field is characterized by the condensate gas phase with very high condensate content, while Well Jinyue 201 is characterized by the phase of near critical volatile oil. Through gas injection experiments, the near-critical reservoirs have three-phase coexistence of dry gas, condensate gas and condensate liquid, resulting in large differences in gas-oil ratio of production wells at different locations.
Li-ming ZHANG , Xiao-qiang WANG , Da-li HOU , Ke XIAO , Chen-guang JIANG , Xiao-mei ZOU . Phase behavior characteristics of near-critical oil and gas reservoirs in Tarim Basin[J]. Natural Gas Geoscience, 2020 , 31(3) : 370 -374 . DOI: 10.11764/j.issn.1672-1926.2019.10.015
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