致密油田注水吞吐采出程度影响因素实验研究  

Experimental Study on Factors Influencing Recovery Degree of Tight Oil Reservoirs by Water Injection and Stimulation

作　　者：杨宏拓 唐后军 李留杰 郭粉转 孙建 YANG Hongtuo;TANG Houjun;LI Liujie;GUO Fanzhuan;SUN Jian(Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi'an Shaanxi 710065,China;Xi'an Shiyou University,Xi'an Shaanxi 710065,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [2]西安石油大学,陕西西安710065

出　　处：《当代化工》2024年第4期897-900,共4页Contemporary Chemical Industry

基　　金：国家自然科学基金重点项目,陆相页岩油在基质-裂缝体系中的多尺度运移机理研究(项目编号:41830431)。

摘　　要：为探索致密油藏注水吞吐提高采收率影响因素,以鄂尔多斯盆地长8致密油储层为研究对象,开展了长岩心室内吞吐实验,研究了渗透率、闷井时间、注入水量、注水速度、吞吐周期、注入压力对长8致密油储层采出程度的影响因素。结果表明:对于致密油长8储层,基质渗透率影响注水吞吐效果,渗透率越大,注水吞吐采出程度越高;原油与基质中的流体交换效率受油焖井时间影响,焖井时间越长,流体交换越充分,最终采出程度越高,但焖井时间存在临界值;注水量、注水速度是地层能量的有效补充,影响吞吐的最终采出程度,注水速度越低,越容易发挥毛细管力的渗吸作用,吞吐效果越好,注水量存在临界值,超过临界值后容易形成优势通道,影响采出效果;注入压力影响岩心内部渗吸作用发生的范围,从而影响最终采出程度,注入压力越高,注入水进入的孔隙越多,渗吸发生的范围越大,吞吐效果越好。研究成果对致密油高效补充能量开发提供借鉴。In order to explore the factors affecting the improvement of oil recovery by water injection stimulation in tight oil reservoirs,a long rock ventricular stimulation experiment was conducted on the Chang 8 tight oil reservoir in the Ordos Basin.The factors affecting the recovery degree of the Chang 8 tight oil reservoir were studied,including permeability,lock-in time,injection water volume,injection rate,and stimulation cycle.The experimental results showed that,for tight oil reservoirs with Chang 8,matrix permeability affected the effectiveness of water injection and stimulation,the higher the permeability,the higher the degree of water injection and stimulation recovery;The fluid exchange efficiency between crude oil and matrix was affected by the oil soak time,the longer the soak time,the more sufficient the fluid exchange,and the higher the final recovery degree,however,there was a critical value for the soak time;The water injection volume and water injection rate were effective supplements to the formation energy,which affected the final recovery degree of stimulation,the lower the water injection rate,the easier it was to exert the capillary force's suction effect,and the better the throughput effect,there was a critical value for the water injection volume,which could easily form a dominant channel and affect the recovery effect after exceeding the critical value.This research achievement provides some reference for the efficient energy supplementation development of tight oil.

关 键 词：鄂尔多斯盆地 致密油储层 注水吞吐 长岩心驱替 

分 类 号：X741[环境科学与工程—环境工程]