海上N油田氮气泡沫驱控水窜注入参数优化模拟研究  

Simulation study on optimal injection parameters of water channeling controlled by nitrogen foam flooding in offshore N oilfield

作　　者：宋鑫 张伟 李越 陈征 蓝飞 SONG Xin;ZHANG Wei;LI Yue;CHEN Zheng;LAN Fei(Bohai Petroleum Research Institute,Tianjin Branch of CNOOC(China)Co.,Ltd.,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300459

出　　处：《精细与专用化学品》2020年第8期27-31,共5页Fine and Specialty Chemicals

基　　金：“十三五”国家科技重大专项“渤海油田高效开发示范工程”(2016ZX05058-003)。

摘　　要：渤海某油田油层厚度大、井距大等问题导致高渗层注入水突进、纵向吸水不均,注水开发效果逐渐变差。为改善水驱开发效果,本研究以N油田目标井组为对象,开展氮气泡沫调驱注入参数敏感性分析以及驱油方案预测。数值模拟结果表明:在目标区块油藏条件下,发泡剂浓度、注入速率、注入段塞体积、气液比、注入方式存在合理范围。当注入段塞体积为0.2PV,注入浓度为0.45%~0.55%,气液比为1.5∶1,采用地下起泡的方式注入氮气泡沫调驱驱油效率、经济性等综合指标最优。动态驱替流线图显示,水驱阶段出现的水窜通道能够通过泡沫段塞实现调剖扩大纵向波及,后续注入泡沫具有遇油消泡作用使得氮气进一步扩大低渗层微观波及实现进一步提高采收率的目的。The problems of a certain oil field in Bohai sea,such as the thickness of the reservoir and the distance between wells,lead to the injection water inrush into the high permeability layer,uneven longitudinal water absorption,and the effect of water injection development gradually becomes worse.In order to improve the development effect of water flooding,this study took the target well group of N oilfield as the object to carry out sensitivity analysis of injection parameters of nitrogen foam flooding and oil displacement scheme prediction.The numerical simulation results showed that there were reasonable ranges in foaming agent concentration,injection rate,injection slug volume,gas-liquid ratio and injection mode under reservoir conditions in the target block.When the injected slug volume was 0.2PV,the injected concentration was 0.45%~0.55%,and the gas-liquid ratio was 1.5∶1,the integrated indexes such as oil efficiency and economy,etc.were the best when nitrogen foam was injected through underground bubbling.It can be seen from the dynamic displacement flow chart that the water channeling in the water flooding stage can realize profile control,extended longitudinal sweep through the foam slug,and the subsequent injection of foam has the effect of oil defoaming,which made nitrogen further expand the microscopic sweep of the low permeability layer to realize the purpose of further improving the recovery factor.

关 键 词：泡沫调驱 注入参数优化 动态驱替流线 微观波及 

分 类 号：TE992[石油与天然气工程—石油机械设备]