渤海稠油油藏水驱后转热水驱物模实验及应用  

Physical model experiments and application of hot water flooding after water flooding in Bohai heavy oil reservoir

作　　者：刘东 廖辉 冯海潮 吴婷婷 耿志刚 LIU Dong;LIAO Hui;FENG Haichao;WU Tingting;GENG Zhigang(CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《中国海上油气》2023年第2期101-110,共10页China Offshore Oil and Gas

基　　金：中海石油(中国)有限公司天津分公司自主科研项目“绥中36-1/旅大5-2水驱后注热机理研究及应用(编号:ZZKY-2020-TJ-08)”部分研究成果。

摘　　要：针对普通稠油常规水驱开发面临的注采流度大、含水上升快、最终采收率低的问题,通过一维及二维物模实验研究了常规水驱后转热水驱时,不同热水温度、不同注入倍数、不同转注时机及高渗条带对驱油效率、波及规律的影响,探讨了海上稠油热水驱的可行性。研究结果表明:随着温度的升高,油水黏度比变小,岩石润湿性向亲水方向转变,导致束缚水饱和度增大,残余油饱和度变低,相对渗透率曲线整体上向右偏移。注热水温度由52℃升至110℃时驱油效率提高约30.9个百分点,从110℃升高至250℃,最终驱油效率仅提升4.3个百分点,注水温度110℃是重要温度拐点,注入倍数的拐点为2 PV。在常规水驱到不同时期(含水率)后转热水驱,均能提高驱油效率,最终驱油效率随转注时机(含水率)的推迟逐渐降低,产出井见水前或见水初期转注热水,可实现注热水充分利用,有效提高驱油效率;注入凝胶能够对高渗条带起到有效的封堵作用,热水的波及面积由7.2%提高到37.7%,调剖后驱油效率提高9.8个百分点。对于油藏中存在水窜通道的情况,在注热水之前需进行调剖处理,处理后可提高后续热水驱的波及效率,从而提高采收率。研究成果可为海上稠油进行热采方案设计提供技术支持。Aiming at the problems faced by conventional water flooding development of ordinary heavy oil,such as high injection-production mobility,fast water cut rise and low ultimate recovery factor,the effects of different hot water temperatures,injection multiples,hot water injection timing and high-permeability belts on oil displacement efficiency and sweep law during hot water flooding after conventional water flooding are studied through one-dimensional and two-dimensional physical model experiments,and the feasibility of offshore heavy oil hot water flooding is discussed.The results show that with the increase of temperature,the oil-water viscosity ratio decreases,and the rock wettability turns to hydrophilic,leading to the increase of irreducible water saturation and the decrease of residual oil saturation,and the relative permeability curve shifts to the right as a whole.When the hot water injection temperature rises from 52℃to 110℃,the oil displacement efficiency increases by 30.9%.When the hot water injection temperature rises from 110℃to 250℃,the final oil displacement efficiency only increases by 4.3%.The optimal water injection temperature is 110℃.The optimal injection multiple is 2 PV.Changing to hot water flooding after conventional water flooding on different periods(different water cut)can improve oil displacement efficiency.The final oil displacement efficiency gradually decreases with the delay of hot water injection timing(water cut).Changing the injected water into hot water before or at the initial stage of water breakthrough in the production well can make full use of the injected hot water and improve the oil displacement efficiency.Injecting gel can effectively seal the high permeability belts.The swept area of hot water is increased from 7.2%to 37.7%,and the oil displacement efficiency is increased by 9.8%after profile control.In case of water channeling in the reservoir,profile control before hot water injection can improve the sweep efficiency of subsequent hot water flooding and impr

关 键 词：稠油油藏 水驱开发 注热增效 物理模拟 数值模拟 

分 类 号：TE345[石油与天然气工程—油气田开发工程]