桥口油田天然气驱提高采收率室内实验研究  

A Laboratory Experimental Study on Natural Gas Injection for Enhancing Oil Recovery in Qiaokou Oil Field

作　　者：许振华[1] 龚宝强[2] 许振波 胡梅 杨方方[1] 曾小军[5] 白莲[1] 袁云[1] 

机构地区：[1]中国石化中原油田公司采油工程技术研究院,河南濮阳457001 [2]中原石油勘探局钻井研究院,河南濮阳457001 [3]濮阳三力化工总厂,河南濮阳457001 [4]长城公司,北京100000 [5]中国石化中原油田公司采油一厂,河南濮阳457172

出　　处：《油田化学》2005年第3期206-209,共4页Oilfield Chemistry

摘　　要：本实验研究是针对中原桥口油田南八仙浅层桥69-08井注天然气项目进行的。该井油藏温度50℃,原始地层压力10.11 MPa,饱和压力9.43 MPa,脱气原油50℃粘度0.96 mPa.s,20℃密度0.7642 g/cm3,实测油气比200m3/m3。采用PVTsim10.0软件得到模拟油藏相图,表明该油藏为不饱和油藏,在油藏压力下开采时油藏流体以单相渗流,油藏流体临界温度331.6℃,临界压力7.66 MPa。注入气为含甲烷89.3%的油藏深层天然气。用3种方法预测的最小混相压力(MMP)值均大于在CFS-200型混相驱实验装置上通过长1.22 m、内径6.35 mm、渗透率7.5μm2的填砂细管测得的MMP值(18 MPa),偏差在+22.2%^+77.8%。在细管驱替实验中,随注入压力增大(10.11~22.0 MPa),气体突破体积(0.79~0.86 PV)、突破时采出程度(49.8%~74.0%)、最终采出程度(59.0%~91.0%)均增大,即混相驱与非混相驱相比,见气晚而采出程度高;在混相驱中,注入压力的影响较小。图6表2参6。This study is aimed at a natural gas injection project to he performed in wall Q-69-08 of Nanhaxian shallow reservoir in Qiaokou, Zhongyuan. The reservoir is characterized by temperature 50℃, original pressure 10.11 MPa, saturation pressure 9.43 MPa, viscosity of degased crude oil 0.96 mPa·s at 50℃, its density 0.7642 g/cm^3 at 20℃, and oil-to-gas ratio 200 m^3/m^3 （determined in laboratory value）. The simulation reservoir fluid phase diagram constructed by using PVT sim10.0 software indicates that for this unsaturated reservoir a monophase reservoir fluid flow will occur under the reservoir pressure and the reservoir fluid has critical temperature 331.6℃ and critical pressure 7.66 MPa. The natural gas to be injected cccnes from the deep reservoir gas-beating strata and contains 89.3% methane. The minimum miscibility pressure （MMP） predicted by using three different methods is much larger than that （18 MPa） determined on CFS-200 micible fluid drive experimental installation with 1.22 m long and 6.35 mm in diameter slim sandpa,：ked tube of permeability 7.5μm^2 with deviation in range ＋ 22.2-＋ 77.8 %. In the slim tube gas drive test it is shown that with ir.creasing gas injection pressure （10.11-22.0 MPa）, increases in gas volume injected （0.79-0.86 PV） and oil recovery （49.8-74.0 % ） at gas breakthrough and ultimate oil recovery （59.0-91.0 % ） are observed; miscible gas drive is featured by later gas breakthrough and higher oil recovery than immiscible one; the influences of gas injection pressure in the miscible gas drive are notably weakened.

关 键 词：相图 油藏流体 天然气驱 细管驱替实验 最低混相压力 注入压力 中原桥口油田 气体突破 提高采收率 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]