低渗油藏CO_(2)驱井网优化调整及开发效果影响因素  

Optimization and Adjustment of CO_(2) Flooding Well Pattern and Influencing Factors of Development Effect in Low Permeability Reservoir

作　　者：何登辉 屈亚光[1,2] 万翠蓉[3] 张晶晨 马国庆 雷梦 李明亮 HE Deng-hui;QU Ya-guang;WAN Cui-rong;ZHANG Jing-chen;MA Guo-qing;LEI Meng;LI Ming-liang(College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Key Laboratory of Oil&Gas Drilling Engineering,Wuhan 430100,China;Chongqing Division,PetroChina Southwest Oil&Gasfield Company,Chongqing 400021,China;Exploration and Development Research Institute,Xinjiang Oilfield Company,Karamay 834000,China;Tianjin Branch of CNOOC,Tianjin 300450,China)

机构地区：[1]长江大学石油工程学院,武汉430100 [2]油气钻采工程湖北省重点实验室,武汉430100 [3]中国石油西南油气田公司重庆气矿,重庆400021 [4]新疆油田公司勘探开发研究院,克拉玛依834000 [5]中海石油(中国)有限公司天津分公司,天津300450

出　　处：《科学技术与工程》2022年第33期14700-14706,共7页Science Technology and Engineering

基　　金：国家科技重大专项(2016ZX05060-009,2016ZX05060-019);中国石油科技创新基金(2020D-5007-0209)。

摘　　要：CO_(2)驱、水平井开发技术能够显著提高低渗油藏的采收率,但是对于非均质性较强的低渗油藏,水驱开发后存在动用程度低的问题,因此有必要研究低渗油藏后期注采方式及注采井网的调整优化和开发效果的影响因素。首先,依据目标油藏建立非均质概念地质模型,建立了一个上下分别为低渗和高渗储层油藏模型,采用油藏数值模拟方法对油藏进行了模拟计算。其次,在油藏模型进行一段时间水驱后,加密调整井网采用水平井注CO_(2)进行二次水气同驱的开发模式。再次,对比不同加密井网模式的采出程度和地层压力,得到最优的加密井网模式进行二次优化开发。最后,基于以上得到的最优井网优化调整模型,研究了井排距、储层渗透率和注CO_(2)压力对该调整井网模式开发效果的影响。油藏数值模拟计算表明:加密水平井采油优于加密直井采油;加密水平井注气可以适当缩短排距,使CO_(2)的驱替更充分,当井距/排距为0.4时,采出程度最大;在不同储层渗透率条件下,在其他生产条件一致的情况下,加密水平井井网时,可以将水平井沿水平渗透率较小方向安置;适当增大注气井注入压力可以有效地提高采收率恢复地层能量。研究成果对该类非均质低渗油藏的开发具有较好的借鉴意义。CO_(2)flooding and horizontal well development technology can significantly improve the recovery of low permeability reservoirs,but for low permeability reservoirs with strong heterogeneity,there is a problem of low production degree after water flooding development.Therefore,it is necessary to study the injection-production mode and the adjustment and optimization of injection-production well pattern in late stage of low permeability reservoirs and the influencing factors of development effect.Firstly,a heterogeneous conceptual geological model was established according to the target reservoir,and a reservoir model with low permeability and high permeability was established.Reservoir numerical simulation method was used to simulate the reservoir.Secondly,after water flooding for a period of time in the reservoir model,CO_(2)injection in horizontal wells was adopted in the infilling and adjusting well pattern to carry out secondary water and gas co-flooding.Thirdly,by comparing the recovery degree and formation pressure of different infill pattern patterns,the optimal infill pattern was obtained for secondary optimization development.Finally,based on the optimal well pattern optimization and adjustment model,the effects of well spacing,reservoir permeability and CO_(2)injection pressure on the development effect of the adjusted well pattern were studied.Numerical simulation of reservoir shows that infill horizontal well is better than infill vertical well.Infused horizontal well gas injection can shorten the row spacing properly,so that CO_(2)displacement is more sufficient.When the well spacing/row spacing is 0.4,the recovery degree is the largest.Under different reservoir permeability conditions,the horizontal well can be placed along the direction of low horizontal permeability when the well pattern of horizontal wells is encrypted under the same production conditions.Properly increasing the injection pressure of gas injection well can effectively improve the recovery of formation energy.The research results h

关 键 词：低渗油藏 油藏数值模拟 加密井网 水平井 水气同驱 

分 类 号：TE341[石油与天然气工程—油气田开发工程]