Natural Gas Geoscience

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A method to analyze the reservoir fluid property before CO2 invasion and alteration

Jiang Feng-guang1,Wang Xiao-lin2,Chen Zhi-hai1   

  1. 1.Sinopec Petroleum Exploration & Production Research Institute,Beijing 100083,China;
    2.PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China
  • Received:2016-08-24 Revised:2017-01-23 Online:2017-03-10 Published:2017-03-10

Abstract:

In the past ten years,some oil/gas reservoirs with high CO2 content have been found in Southeast Asia and the east coast of South America,which bring new challenges to the development of oil and gas reservoirs.CO2 has significant extraction effect on the light-medium weight components of the crude oil.As a result,in the gas cap,CO2 is the major component and the molar fraction of C7+ in the oil rim is very high;fluid composition and distribution characteristics are neither like conventional gas condensate reservoirs nor like oil reservoirs under miscible flooding.Based on the composition of reservoir fluid samples,according to the Kay mixing rule,conservation of substance,and Span & Wagner equation of state,a method to restore the reservoir fluid composition before CO2 invasion and alteration is built.Then fluid composition and spatial distribution of the original reservoir is restored after which CO2 invasion and alteration process is modeled using computer simulation and fluid composition and distribution of the resulting high-CO2 reservoir is obtained after equilibration.The method is used to predict the fluid composition and spatial distribution of an oil reservoir with high-CO2 content in deep water.The results are basically consistent with the reservoir fluid sampling results,which show that the method is feasible.

Key words: CO2, Later period, Invasion, Gas /oil reservoir, Fluid property, Restore, Method

CLC Number: 

  • TE311

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