摘要
为了研究延长油田J区块CO_2驱相态,根据细管实验得到工区最小混相压力,考虑地层破裂压力计算井口最大注气压力,结合工区目前井口注气压力分析了CO_2驱相态。结果表明,工区CO_2驱最小混相压力为22.2 MPa,井底破裂压力为33.88 MPa,井口最大注气压力可达15.8 MPa;目前工区单井最高注气压力为10.5 MPa,对应注气井底压力为19.1 MPa,低于最小混相压力,属于非混相驱油。当井口注气压力提高到15.0 MPa时,注气井底压力为23.6 MPa,高于最小混相压力,注气井近井地带存在混相区。
Phase of CO 2 flooding is studied,combining with MMP and maximum gas injection pressure in the study area.The results show that the MMP is 22.2 MPa.The fracture pressure of formation is 33.88 MPa.The maximum gas injection pressure of wellhead is 15.8 MPa.The gas injection pressure is 10.5 MPa,and corresponding injection gas pressure of well bottom is 19.1 MPa.CO 2 flooding belongs to immiscible flooding.When the gas injection pressure of wellhead is increased to 15.0 MPa,the bottom hole pressure is 23.6 MPa,which is higher than the minimum miscible pressure,there is miscible zone near the well area in the gas injection well.
作者
杨永超
姚振杰
Yang Yongchao;Yao Zhenjie(Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an Shaanxi 710075,China)
出处
《石油化工高等学校学报》
CAS
2018年第2期61-64,共4页
Journal of Petrochemical Universities
基金
国家重点研发计划资助项目(6YFE0102500)
陕西省科技统筹创新工程计划项目(2014KTZB03-02)
关键词
延长油田
CO2驱
相态
注气压力
非混相
Yanchang oilfield
CO2 flooding
Phase
Injection pressure
Immiscible
