渤海JS油田气顶边水油藏气窜水淹规律探索

JS油田沙河街组发育气顶边水窄油环的层状构造油气藏,采用水平井分层系开发模式,初期开发效果较好,后期面临气窜、水淹生产问题,产量递减率较大。在小层精细划分与对比、沉积微相研究的基础上,对油田主力砂体组合模式进行分类,建立对应机理模型;采用数模法研究气、油、水三相流体运移规律,总结了各种砂体组合模式下的气窜、水淹特征;研究成果成功指导油田多口井的卡气、堵水作业,增油效果显著。

Gas channeling and water flooding regularities of oil reservoirs with gas cap and edge water in JS oilfield of Bohai sea

Shahejie formation of JS oilfield was a layered structure reservoir with gas cap,edge water and narrow oil rim.By adopting horizontal wells penetrating multiple layers,there was good effect in early development,while in late development gas channeling and water flooding occurred,which may lead to high output decline rate.Based on the study of sublayer fine division and comparison,as well as sedimentary micro-facies,the combination models of major sandbodies were classified and the corresponding mechanism models were established.By using numerical simulation,the gasoil-water three-phase migration regularity was studied and the characteristics of gas channeling and water flooding under different models were summarized.The research results successfully provided good guidance for treibgas and water plugging in many wells and realized good oil increasing effects.