CP油田稠油裂缝性油藏开发方式优选

CP油田为埋深较浅的双重介质砂砾岩背斜构造普通稠油油藏,以常规冷采方式投入开发以来,开发效果较差。为此,依据该区原油黏度大、流动性差且地层裂缝发育的地质特点,考虑采用热采方式改善油田开发效果。参照稠油热采开发方式筛选标准并利用油藏数值模拟方法进行了分析验证。研究结果表明,CP油田采用衰竭式+蒸汽吞吐的开发方式为最佳开发方式,原油采收率可达到41.4%。在此基础上,利用油藏数值模拟的方法对蒸汽吞吐参数进行了优选,并对井底干度进行了敏感性分析。根据上述开发方案对CP油田一口冷采井进行了现场试验,在注汽速度较低的情况下,取得了较好的增油效果。由此可以看出,该油田的成功经验对相似油田转换开发方式具有一定的借鉴意义。

Optimization of Development Methods for Heavy Oil Fractured Reservoir of CP Oilfield

CP Oilfield is a dual medium of porosity glutenite anticline structure and is a x3suhshallow heavy oil reservoir.It was developed in natural depletion manner but the development effect was poor.Thermal development method is expected to get the better development effect according to the characteristics of crude oil that has the high viscosity,poor flow properties and buries in the creviced formation.According to the screening criteria of heavy oil development we analyzed and verified the result with reservoir numerical simulation method.The results show that depletion manner + huff and puff is the best development method.The ultimate recovery can be 52%.The reservoir numerical simulation method was farther applied to optimize the parameters and analyzed the sensitivity of the bottom hole dryness fraction.According to the optimized results of numerical simulation,the plan was implemented for one well in CP heavy oil reservoir.It has obtained a good effect in the case of low steam injection rate.This development mode provided a reference significance for similar oilfield.