收稿日期: 2016-08-24
修回日期: 2017-01-23
网络出版日期: 2017-03-10
基金资助
国家科技重大专项“CO2驱油与埋存潜力评价及战略规划”(编号：2011ZX05016)资助.
A method to analyze the reservoir fluid property before CO2 invasion and alteration
Received date: 2016-08-24
Revised date: 2017-01-23
Online published: 2017-03-10
最近10年，在东南亚海域和南美东海岸发现一些高含CO2的带有CO2气顶的油环或底油油藏，对油气藏开发技术带来新的挑战。CO2对原油中的中轻质组分的萃取作用显著，造成气顶气区以CO2组分为主，底油或油环中的C7+以上组分明显偏高，流体组成与分布特征既不同于传统的凝析气藏，又不同于混相驱油藏。基于油藏烃类取样样品组成，按照Kay混合法则、物质守恒原理及Span & Wagner状态方程等建立了CO2充注改造前油藏流体组成恢复方法，恢复出古油藏烃类流体组成与分布，应用油藏数值模拟方法模拟CO2充注改造油藏过程，达到平衡后获取高含CO2油气藏的流体组成与空间分布特征。应用该方法对某深水高含CO2油藏流体组成和空间分布进行了预测，预测结果与油藏取样结果基本相符，表明该方法是可行的。
姜凤光，王小林，陈志海 . 二氧化碳侵入前油气藏流体性质定量分析[J]. 天然气地球科学, 2017 , 28(3) : 488 -493 . DOI: 10.11764/j.issn.1672-1926.2017.01.011
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
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