摘要
为了解释红河油田注CO2现场试验中出现的气窜问题,准确优化现场试验中CO2注入压力,利用传热学理论,通过分析井筒传热过程,建立起注CO2井筒温度和压力分布的耦合模型,并结合实际注入参数,对红河油田注CO2井筒温度和压力分布进行了研究,此外也解释了现场试验中出现的气窜问题。结果表明,在注入井实际注入参数下,井筒温度随着井筒深度的增加而增大,但始终低于地层原始温度;井筒压力随着井筒深度的增加呈近似线性增加;井口注入压力过大致使井底压力大于地层破裂压力,这是导致发生气窜现象的根本原因。模型理论计算结果与现场分析结果相吻合,表明该模型对于实际生产具有一定的指导意义。
In order to explain the gas breakthrough phenomenon in CO2 flooding field test and accurately optimize the injection pressure, a mathematical model to describe the temperature and pressure distribution was established based on the analysis of wellbore heat transmission and the theory of heat transfer. The temperature and pressure distribution for CO2 injection well in Honghe Oilfield was studied, meanwhile the gas breakthrough phenomenon in CO2 flooding field test was explained by the model combined with the actual injection parameter. The results show that the wellbore temperature increases with the increasing of well depth, while keeps lower than the formation temperature, and the wellbore pressure increases linearly approximately with the increasing of well depth. The greater injection pressure leads to that the bottomhole pressure exceeds formation fracture pressure, which is the root cause of gas breakthrough. The theoretical calculation agreed well with the field analysis, which shows that the model had an excellent guiding significance to the field test.
出处
《岩性油气藏》
CSCD
2014年第2期108-113,共6页
Lithologic Reservoirs
基金
中国石化科技部项目"改善鄂南致密油藏水平井开发效果工艺研究"(编号:P13090)资助
关键词
注CO2
井筒温度压力分布
气窜
红河油田
C02 injection
wellbore temperature and pressure distribution
gas breakthrough
Honghe Oilfield
