低渗透油藏周期注CO₂驱油室内实验

Experimental study of cycle CO2 injection for low permeability reservoir

王维波 陈龙龙 汤瑞佳 王贺谊 杨红

陕西延长石油（集团）有限责任公司研究院，陕西 西安 710075

Research Institute of Shaanxi Yanchang Petroleum(Group)Co. Ltd., Xi′an 710075, China

针对靖边油田乔家洼区块203井区的特点，开展室内CO₂驱油实验研究，对周期注气的驱油潜力进行评价，并对注气段塞尺寸和注气速度进行优化。实验结果表明：周期注CO₂在目标井区具有较大的驱油潜力，可在连续气驱的基础上将采收率提高15.29百分点，并且比连续注气多注入0.8 PV时才发生气窜，延缓气窜效果明显；经优化的最佳注气段塞尺寸和最佳注气速度分别为0.05 PV和1.2 mL/min。研究成果为目标区块开展CO₂注气试验提供理论支持和技术参考。

Aiming at 203 well area of Qiaojiawa Block, Jingbian Oilfield, CO₂ flooding indoor experiments were carried out to evaluate its potential and the injected slug size, and injected velocity wass optimized. The results shows that: the potential of cycle CO₂ injection is great in the target well area; oil recovery can be improved about 15.29%, and the CO₂ channeling time is late about 0.8 PV compared with continuous gas CO2 flooding; the best injected slug size and velocity are 0.05 PV and 1.2 ml/min. This results provide theory support and technology reference for CO₂ flooding in the target blocks.

10.6056/dkyqt201602016