水气分散体系的超声波振荡生成方法及驱油实验研究  

Formation of gas bubble-water dispersion system using ultrasonic vibrationmethod and research on its impact on ultimate oil recovery

作　　者：陈兴隆[1,2] 伍家忠[1,2] 韩海水[1,2] 刘莉[1,2] CHEN Xinglong;WU Jiazhong;HAN Haishui;LIU Li(PetroChina Research Institute of Petroleum Exploration&Development,Beijing,100083,China;State Key Laboratory of Enhanced Oil Recovery,Beijing,100083,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]提高石油采收率国家重点实验室,北京100083

出　　处：《天然气与石油》2021年第4期48-52,共5页Natural Gas and Oil

基　　金：国家重大专项课题“低渗—超低渗油藏提高采收率新方法与关键技术”(2017ZX05013003)。

摘　　要：针对油藏水驱开发后期的水驱优势通道明显、剩余油动用困难的问题,研制了水气分散的驱油体系,即将气体分散到水中形成均匀稳定的微米级气泡。根据超声波振荡原理,结合孔板微孔的剪切作用,实验室生成了微米级水气分散体系。由高速摄像机及体视显微镜获取图像并测量微米气泡半径均值约为2.5μm,远小于常规孔板喷射法生成的气泡半径(50μm),气泡的均匀度、分散性及稳定性均大幅提高。建立了以泡径、气泡上升速度等为关键参数的水气分散体系性能评价方法,从理论上评价了超声波振荡生成方法生成的微米级气泡的特点。根据长度100 cm、直径3.8 cm的低渗透岩心驱油实验,微米级水气分散体系在水驱结束后可继续提高采出程度10%以上,证明水气分散体系可通过气泡形变及调节渗流阻力等方式有效扩大波及体积,提高剩余油动用效果。To address the issue of channelling effect and difficulties in displacing remaining oil reserves in the later stage of water flooding,a gas bubble-water dispersion system was developed,in which the gas was dispersed in water to form uniform and stable micro bubbles.According to the principle of ultrasonic vibration,combined with the shear action of micro-orifice plate,micro gas bubble dispersed in water was produced in the laboratory.Using a stereo-microscope to take measurement from photos taken by high speed camera,the average micro bubble radius is found to be approximately 2.5μm,which is much smaller than the 50μm radius bubbles produced through the conventional orifice injection method.In addition,the uniformity,dispersiveness and stability of the bubbles are greatly improved.With bubble diameter and bubble rising velocity as key parameters,the performance evaluation method of dispersed gas bubble in water system is established.The characteristics of micro bubble generated by ultrasonic high frequency vibration method are theoretically evaluated.According to the oil displacement experiment using low permeability core with a length of 100 cm and a diameter of 3.8 cm,micro gas bubble-water dispersion system can continue after the end of water flooding and increase ultimate oil recovery by more than 10%.Therefore,it proves that the gas bubble-water dispersion system can effectively expand the swept volume and improve the ultimate recovery of remaining oil-in-place by means of bubble size change and regulation of seepage resistance.

关 键 词：超声波振荡 水气分散体系 气泡半径 微米级 驱油实验 

分 类 号：TE327[石油与天然气工程—油气田开发工程]