摘要
以NT油藏为研究对象,针对NT油藏低孔低渗、非均质性强、含水率高的特点,对原油可动饱和度以及注气驱油特征进行了研究。试验结果表明,氮气驱后转氮气泡沫驱可以有效封堵高渗层。泡沫沿着优势渗流通道进入高渗层,完成对高渗岩心的封堵作用,扩大氮气在低渗岩心的波及体积,提高低渗岩心的采出程度;气水交替驱适合注水突破时转注,注水突破转气水交替驱,突破时间晚,气油两相接触时间长,有利于降低原油密度黏度;气水交替驱适合采用0.05 HCPV段塞体积,能维持泡沫的稳定性,气体突破时间晚,封堵效果较为明显。
Taking NT reservoir as the research object,according to the characteristics of low porosity,low permeability,strong heterogeneity,and high water content of NT reservoir,the movable saturation of crude oil and the characteristics of gas injection and oil displacement are studied.The results show that nitrogen foam flooding after nitrogen flooding can effectively plug the high permeability layer.The foam enters into the high permeability layer along the dominant seepage channel,completes the plugging of the high permeability core,expands the swept volume of nitrogen in the low permeability core,and improves the recovery degree of the low permeability core.Gas-water alternate flooding is suitable for switching to water injection during water injection breakthrough.Water injection breakthrough is converted to gas-water alternate flooding,with a late breakthrough time and a long contact time between gas and oil phases,which is beneficial for reducing the density and viscosity of crude oil.The gas-water alternative flooding is suitable for 0.05 HCPV slug volume,which can maintain the stability of foam.The gas breakthrough time is late,and the plugging effect is obvious.
作者
华溱
刘东东
张昂昂
秦冬
蔡廷强
HUA Qin;LIU Dongdong;ZHANG Ang’ang;QIN Dong;CAI Tingqiang(Nanniwan Oil Production Plant of Yanchang Oilfield Co.,Ltd.,Yan’an 716007,Shaanxi,China;Yan’an Zhongshida Oil and Gas Engineering Technology Service Co.,Ltd.,Yan’an 716000,Shaanxi,China)
出处
《能源化工》
CAS
2023年第3期55-59,共5页
Energy Chemical Industry
基金
国家科技重大专项“低丰度致密低渗油气藏开发关键技术”(2016ZX05048)。
关键词
高含水油藏
气驱
双管并联
提高采收率
high water-bearing reservoir
gas drive
double pipe parallel connection
enhanced recovery
