冷41断块边底水稠油油藏油井出水判别方法浅析

Judging method of water production in oil wells of heavy oil reservoir with bottom and edge water in Leng 41 fault block

通过分析油井的生产动态,识别深层块状边底水稠油油藏油井出水特征,从而分析总结地层水的有效识别方法。油井如果见地层水,其水油比曲线存在拐点,即水油比变化率大于0。研究结果表明,冷41断块油井周期回采水率上升迅速,周期回采水率大于100%,且居高不下,因此可以判定油井见地层水。

Through analyzing production performance, water production features of oil wells in deep massive heavy oil reservoir with bottom and edge water have been discerned, thereby, the effective discerning method of formation water has been analyzed and summarized. If water breakthrough occurs in oil well, there will be a inflection point on the curve of water - oil ratio, i. e. the rate of change of water - oil ratio is above 0. Study result shows that cyclic water back production rale in Leng 41 fault block goes up rapidly. higher than 100% , and has kept at high level, so than it can be determined that formation water has broken through in oil well.