高含水油藏CO2驱油机理

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placed.
This is macroscopically represented by high water
cut
and low oil recovery speed during the early gas i njection,and sharply This study defines

decreased water high water high water
rate.
However,in high water
cut
oil reservoirs。water
can
dis—
con—
contact
between C()!and crude oil,thereby influencing flooding effect. To address this issue.this study
第37卷增刊1
2016年11月




V01.37
Nov.
S.1
2()16
ACTA PETROLEI SINICA
文章编号:()253—2697(2016)S卜0143一()8 -__J‘
Cj
DOI:1().7623/syXb2016s1014
同 含水油藏C02驱油机理
周 宇


苟斐斐
郎东江
…J083)
引用:周宇,王锐,苟斐斐,郎东江.高含水油藏C()!驱油机理[J].石油学报,2()16,37(增刊1):143—1 5(). cut reservoirs[J].Acta
Key
cut cut
and increasing oil recovery speed after C0二broke through,.
C()二flooding mechanism for
oil reservoirs,explains its effectiveness characteristics,and offers reference for improving the C()!flooding effect of oil reservoirs.
so
high water
contact
cut
oil reservoir,the percentage of
C()!dissolution loss in water is affect the remaining oil in the
water
not
to
the remaining。il shielded by water and
(中国石油化工股份有限公司石油勘探开发研究院北京
摘要:C()二驱油能够有效提高原油采收率,但在高含水油藏中,水能够溶解C0二,并影响C()二与原油接触,从而影响驱油效果。针对 这一问题,开展了c()二在油、水中的浓度分配实验,通过建立c():在油、水中扩散的数学模型,使用核磁共振研究c():驱替实验,探 索了c()二在高含水油藏中的溶解扩散机理以及对综合驱油效果的影响。结果表明,在高含水油藏中,C()二在水中溶解损失的比例 不高,同时C():能够快速渗透水膜,与被水屏蔽的剩余油接触,波及水驱未波及区域内的剩余油。由于水膜阻隔了原油与C0二的 直接接触,在C()!驱替过程中会首先驱出水膜,使油、气直接接触,再驱出剩余油。其宏观表现为注气早期含水率较高、采油速度较 低,当C()二突破后,含水率急剧下降,采油速度升高。研究明确了高含水油藏C01驱油机理,解释了其见效特征,并为改善高含水
cut
words:C0二flooding;high water
stage;concentration
distribution;C01 diffusion;flooding
tes‘
cite:zhou Yu,wang Rui,Gou Feifei,I,ang Dongjiang.c()二flooding mechanism in high water 2()16,37(S1):143—1 5().
1()()()83。C^“?Ⅱ)
(Si”opPf PPf,‘oZP“聍z E工pZo,。n£io九“”d ProdMffio玎RPsPnr(’^,行sf打“fF,BPiJ i”g
Abstract:C()二flooding is able solve C()二and hamper ducts

to
effectively increase crude oil recovery
contact
area
Since water film blocks direct
contact
between crude oil and C01,
film will be displaced first during C()二flooding
that oil comes in direct
cut
with gas.then the remaining oil will be dis—
C()二flooding
on
test
to
the explore dissolution and diffusion mechanism of C()!in high water

oil reservoir and its influences
overall flooding effect. The results indicate that in high,and C()二can penetrate water film quickly unaffected by water flooding.
油藏C0二驱油效果提供了参考。 关键词:C01驱油;高含水期;溶解分配;C()二扩散;驱替实验 中图分类号:TE357
45
文献标识码:A
002 flooding mechanism in high water cut reserVoirs
Zhou Yu
Wang
Rui
Gou Feifei
Lang
Dongj iang
test
concentration
on
partitioning
of C()二in oil and water,builds by NMR,so
as

mathematical model for diffusion of C()!in oil and water,and
cut
performs analyses