边水水平井开发油藏调剖效果影响研究

Study on influencing factors of profile control effect of horizontal well development reservoir with edge water

渤海Q油田采用水平井开发,边水水侵是导致该油田采收率低的主要原因。通过物理模拟与数值模拟相结合的方法,对边水油藏水平井开发调剖效果的影响因素进行了研究。结果表明:1)随着边水距离的减小,调剖后采收率提高值先升后降,边水距离为550 m时调剖效果最好;2)对于边水水平井开发油藏,调剖时机选择越早,提高采收率值也相应越高,效果越显著;3)边水能量的大小对边水油藏的水平井调剖效果影响较大。随着边水能量的增加,调剖效果逐渐变差。边水能量大于10倍时对调剖效果影响较大。目前渤海Q油田大多数区块的边水能量小于6倍且含水率为52.4%,可以尽快进行调剖调驱的现场实施。该研究成果为边水水平井开发油藏的后续稳油控水决策提供了技术指导。

Bohai Q Oilfield is developed by horizontal wells,and the edge water invasion becomes the main reason for the low recovery of the oilfield.Combined physical simulation with numerical simulation,the authors studied the factors that influence the profile control effects of horizontal well development reservoirs with edge water.The results show that:1)The enhanced oil recovery(EOR)first increases and then decreases after profile modification with the decrease of the edge water distance,and the profile modification effect is best when the edge water distance is 550 m;2)For the horizontal well development oil reservoirs with edge water,the earlier the timing of profile control is,the higher the corresponding oil recovery value and the more significant the effect;3)The edge water energy has a significant impact on the profile control effect of horizontal wells in edge water reservoirs.As the energy of edge water increases,the profile control effect gradually deteriorates.The edge water energy significantly impacts the profile control effect when it is greater than ten times.The edge water energy of most blocks in Bohai Q Oilfield is less than six times,and the current water content is 52.4%.Therefore,on-site implementation of profile control and flooding should be carried out as soon as possible.This research achievement provides technical guidance for the subsequent decision-making of stabilizing oil and controlling water in the horizontal well development reservoirs with edge water.