大庆油田聚合物驱后周期分质注聚合物技术  

Cyclic injection technology of different polymer after polymer flooding in Daqing Oilfield

作　　者：郭文敏[1] 刘同敬[2] 秦积舜[3] 雷占祥[3] 吴蔚[4] 吕爱华[1] 

机构地区：[1]江苏工业学院机械与能源工程学院,江苏常州213016 [2]中国石油大学提高采收率研究中心,北京102249 [3]中国石油勘探开发研究院,北京100083 [4]中国石油大庆油田有限责任公司采油一厂,黑龙江大庆163000

出　　处：《石油学报》2010年第3期449-451,共3页Acta Petrolei Sinica

基　　金：国家重点基础研究发展规划(973)项目(G1999022511)部分成果

摘　　要：为进一步提高聚合物驱开发效果,针对不同渗透率地层,研究了不同分子量聚合物分子回旋半径与地层孔喉半径的配伍关系,结合周期注水原理,形成不同分子量聚合物溶液周期注入技术。在考虑聚合物井筒炮眼剪切降黏作用下,地层平均渗透率为35×10-3μm2时,应选用800×104分子量聚合物;平均渗透率为100×10-3μm2时,应选用1 200×104分子量聚合物;渗透率大于300×10-3μm2时,应选用2 500×104以上分子量聚合物;分质注聚合物半周期控制在约3个月为最佳。相比传统笼统注聚合物方法,周期分质注聚合物技术可以综合聚合物驱及周期注水技术,更为有效地提高石油采收率。In order to improve the effect of polymer flooding,the compatibility between polymer molecular weight and formation pore-throat radius with different permeability was studied.Based on the cyclic water-flooding theory,the cyclic injection technology of polymers with different molecular weight was set up.In consideration of the action of shear thinning of polymer in the perforation interval of well bore,the polymer with molecular weight of 800×104 should be selected when the average permeability of formation is 35×10-3μm2.The polymer with molecular weight of 12×106 should be chosen when the average permeability of formation is 100×10-3μm2.When the average permeability of formation is over 300×10-3μm2,the polymer with molecular weight over 25×106 should be applied.The half cycle of the polymer injection should be about 3 months.Compared with the conventional polymer injection,the cyclic injection technology of polymer with different molecular weight can be combined with the polymer flooding and water flooding technologies,which can effectively enhance oil recovery.

关 键 词：分质注聚合物技术 孔喉半径 聚合物 周期注水 渗透率 提高采收率 

分 类 号：TE357.431[石油与天然气工程—油气田开发工程]