动态渗吸对超低渗透油藏开发的影响及应用  

Influence and Application of Dynamic Imbibition on the Development of Ultra-low Permeability Reservoirs

作　　者：胡亚斐[1] 李军诗 胡水清[1] 吴峙颖 姜晶[4] 董宁 胡泊旸 吕彦兵 Hu Yafei;Li Junshi;Hu Shuiqing;Wu Zhiying;Jiang Jing;Dong Ning;Hu Boyang;Lyu Yanbing(Research Institute of Petroleum Exploration&Development,Beijing 100083,China;CNPC Counseling Center,Beijing 100120,China;Sinopec Research Institute of Petroleum Engineering,Beijing 100101,China;CNOOC Tianjin Branch,Tianjin 300459,China;Tianjin Kunlun Gas Co.,Ltd.,Tianjin 300459,China;China Petroleum Technology and Development Corporation,Beijing 100028,China;PetroChina Huabei Oilfield Company,Jincheng,Shanxi 048203,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油咨询中心,北京100120 [3]中国石化石油工程技术研究院,北京100101 [4]中海石油(中国)有限公司天津分公司,天津300459 [5]天津昆仑燃气有限公司,天津300459 [6]中国石油技术开发有限公司,北京100028 [7]中国石油华北油田分公司,山西晋城048203

出　　处：《特种油气藏》2021年第4期123-128,共6页Special Oil & Gas Reservoirs

基　　金：中国石油科学研究与技术开发项目“低渗透油田水驱控递减关键技术研究与应用”(kt2018-11-02-01)。

摘　　要：针对超低渗透油藏渗透率低、孔喉结构复杂、非均质性强、常规注水难以建立有效驱替、裂缝-基质间渗吸作用强等问题,运用室内渗吸实验和相似理论,在分析超低渗透油藏动态渗吸驱油机理的基础上,得到动态渗吸特征及主要影响因素,并将实验室数据应用到油田现场。实验结果表明:影响超低渗透油藏动态渗吸的主要因素包括润湿性、注入速度、裂缝密度、吞吐周期等。其中,润湿性是渗吸的主要影响因素,岩石亲水性越强,渗透率越高,裂缝越多,动态渗吸效果越好;适合超低渗透油藏开发的注水速度为0.1 mL/min;合理吞吐周期为2~3个,优化闷井时间为30 d左右。矿场试验表明,鄂尔多斯盆地A油田5口水平井进行体积压裂并利用动态渗吸采油后,平均含水下降20个百分点,5口水平井累计增油2145 t,效果显著。研究成果对超低渗透油田生产方案的制订有指导意义。In view of low permeability in ultra-low permeability reservoirs,complex pore throat structure,high heterogeneity,difficulty in realizing effective displacement with conventional water injection,strong imbibition between fractures and matrixes,and other problems,dynamic imbibition characteristics and main influencing factors were worked out by indoor imbibition experiments and similar theories on the basis of the mechanism analysis of dynamic imbibition and oil displacement in ultra-low permeability reservoirs,and the laboratory data were applied to the oilfield site.As indicated by experimental results,the main factors affecting dynamic imbibition in ultra-low permeability reservoirs included wettability,injection rate,fracture density,and stimulation turns.Among them,wettability was the primary factor affecting the imbibition.The stronger the hydrophilicity of the rock,the higher the permeability,the more fractures,and the better the dynamic imbibition effect;the water injection rate suitable for the development of ultra-low permeability reservoir was 0.1 mL/min;the reasonable stimulation turn was 2 to 3 cycles,and the optimal shut-in duration was about 30 days.The significant effect of dynamic imbibition was proven by the field tests where the average water cut was reduced by 20 percentage points,and the cumulative oil production was increased by 2145 t in 5 horizontal wells after fracturing by stimulated reservoir volume and dynamic imbibition in Oilfield A,Ordos Basin.The study results play a guiding role in the formulation of production scheme of ultra-low permeability oilfields.

关 键 词：超低渗透油藏 动态渗吸 渗吸采收率 吞吐轮次 闷井时间 长庆油田 

分 类 号：TE348[石油与天然气工程—油气田开发工程]