压裂液在火山岩不同类型孔隙中的分布特征——以新疆西泉井区火山岩油藏为例  

Study on the distribution characteristics of fracturing fluid in different types of pores of volcanic rocks:Taking volcanic rock reservoir of Xiquan Well Area in Xinjiang as an example

作　　者：孙敬[1] 叶习文 商玉锋 刘德华[1] 孔垂显[2] 蒋庆平[2] 米热尼沙·吐尔逊 SUN Jing;YE Xiwen;SHANG Yufeng;LIU Dehua;KONG Chuixian;JIANG Qingping;MIERENISHA·Tuerxun(School of Petroleum Engineering,Yangtze University,Wuhan 430100,Hubei;Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,Xinjiang)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《长江大学学报（自然科学版）》2022年第1期70-78,共9页Journal of Yangtze University(Natural Science Edition)

基　　金：国家科技重大专项“涪陵页岩气水平井多段压裂效果与生产规律分析研究”(2016ZX0506);中国石油天然气集团有限公司科技重大专项“火山岩油藏效益开发关键技术研究与应用”(2017E-0405)。

摘　　要：火山岩毛细管压力强,渗吸作用明显,明确火山岩渗吸规律对提高火山岩油藏采收率具有至关重要的作用。基于核磁共振技术,对新疆西泉井区火山岩油藏岩样开展渗吸作用下压裂液分布特征试验研究,通过监测静态自发渗吸过程中压裂液在火山岩岩样不同类型孔隙中的分布状况,分析了自发渗吸过程中油水变化特征,定量表征了不同孔隙在渗吸过程中的渗吸速率和采出贡献率。试验结果表明,火山岩发生自发渗吸作用的主要孔隙为毛细管束缚孔隙,孔隙区间为0.0017~0.0365μm;渗吸作用前14h毛细管束缚孔隙渗吸速率大,14h后渗吸速率逐渐减小,38h后渗吸作用基本结束,毛细管束缚孔隙渗吸速率与渗吸时间符合乘幂函数关系;毛细管束缚孔隙最终采收率较可动流体孔隙最终采收率高,毛细管束缚孔隙为渗吸产油主要贡献孔隙,在渗吸作用中占有主要地位。该研究结果对于火山岩油藏压裂后焖井优化有一定的指导意义,可为火山岩油藏高效开采提供一定的理论基础。Due to the strong capillary force and obvious imbibition of volcanic rocks,it is very important to clarify the imbibition law of volcanic rocks to improve the recovery efficiency of volcanic rock reservoir.Based on nuclear magnetic resonance technology,the experimental research was carried out on the distribution characteristics of fracturing fluid under imbibition of volcanic reservoir rock samples in Xiquan Well Area of Xinjiang.By monitoring the distribution of fracturing fluid in different types of pores of volcanic rock samples in the process of static spontaneous imbibition,the change characteristics of oil and water in the process of spontaneous imbibition were analyzed,and the imbibition rate and recovery contribution rate of different pores in the process of imbibition were quantitatively characterized.Theexperimental results show that the main pores of spontaneous imbibition of volcanic rocks are capillary bound pores,and the pore range is 0.0017~0.0365μm;The imbibition rate of capillary bound pores is large 14 hours beforespontaneous imbibition,decreased gradually after 14 hours,and basically ended after 38 hours.The imbibition rate of capillary bound fluid pores and imbibition time accord with a power function;The ultimate recovery of capillary bound pores is higher than that of movable fluid pores.The capillary bound pores are the main contributing pores for oil production by imbibition and play a major role in imbibition.The research of this paper has a certain guiding significance for the optimization of soaking after fracturing in volcanic rock reservoir,and can provide a certain theoretical basis for efficient production of volcanic rock reservoir.

关 键 词：火山岩 静态自发渗吸 核磁共振 毛细管束缚孔隙 渗吸速率 采收率 

分 类 号：TE349[石油与天然气工程—油气田开发工程]