疏松砂岩稠油油藏调剖试验效果评价  

Effect evaluation on profile control experiments in the unconsolidated sandstone heavy oil reservoir

作　　者：冯有奎[1] 唐颖 闫伟 李永康 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中信石油技术开发(北京)有限公司,北京100004 [3]华油能源集团,北京100088

出　　处：《油气地质与采收率》2015年第3期124-128,共5页Petroleum Geology and Recovery Efficiency

摘　　要：KBM油田属疏松砂岩稠油油藏,开发过程中含水率上升快、产量递减大、控水稳油难度大,需通过试验研究确定高效开发措施。针对该油田的矛盾和特点,采用聚合物水膨体、聚合物冻胶等组合调堵剂,2013年4—8月在该油田中区G和D层开展了深部调剖试验,平均单井注入调堵剂量为2 187 m3。试验结果表明:注入压力平均增加1.5MPa;吸水剖面改善显著,420井主力层吸水厚度由5.5 m增至9.5 m,主力吸水层的吸水强度由11.2 m3/m下降到3.2m3/m;受效油井增油效果明显,23口采油井中19口见到效果,见效率为82.6%,综合含水率由88%下降到83%,年累积增油量达13 408 t;调堵有效期长,调剖有效期超过12个月。根据计算分析,阻力系数提高到3.26,调驱后地层渗流阻力明显减小。建议该油田开发过程中优选适合疏松砂岩稠油油藏特点并具有调剖和驱油双重效果的调剖体系。KBM oilfield belongs to unconsolidated sandstone heavy oil reservoir. It is difficult to control the water cut and make oil production stable for the water cut rises quickly and the oil production declines greatly in the process of development. Efficient development measure should be taken through experimental research. According to the characteristics of the oilfield,combined plugging agents such as polymer water swelling and polymer gel were applied. During April to August 2013,a deep profile control experiment was made in the G and D layers of the oilfield central area. The average amount of the injected plugging agents is 2 187 m3 in each well. The results showed that the injection pressure raised by1.5 MPa averagely. The injection profile was improved apparently:the swelling thickness of the main layers in oil well 420 raised from 5.5 m to 9.5 m and the swelling strength of the main layers dropped from 11.2 m3/m to 3.2 m3/m. The effect of oil production increases was obvious in the response producer:82.6% of the total 23 oil wells had good response. Composite water cut dropped from 88% to 83%. Accumulated annual oil production increased to 13 408 t. The effective period of the profile control and water plugging was more than 12 months long. The resistance factor rises to 3.26 based on the calculation and analysis. The formation flow resistance decreased obviously after profile control and flooding. A profile control system that fits for the unconsolidated sandstone heavy oil reservoir and has both effects of profile control and flooding is suggested to be optimized and used in the oilfield development.

关 键 词：疏松砂岩 稠油油藏 深部调驱 增油 阻力系数 提高采收率 

分 类 号：TE345[石油与天然气工程—油气田开发工程]