海上稠油超临界多元热流体驱油特征物理模拟  

Physical simulation study on oil flooding characteristics of supercritical multiple-hermal fluids in offshore heavy oil reservoirs

作　　者：李晓宇 孙晓飞[1] 蔡佳明 王学谦 张青权 胡金鹏 韦昌坤 LI Xiaoyu;SUN Xiaofei;CAI Jiaming;WANG Xueqian;ZHANG Qingquan;HU Jinpeng;WEI Changkun(School of Petroleum Engineering,China Univeristy of Petroleum(East China),Qingdao 266580,China;Oil&Gas Technology Research Institute of Changqing Oilfield Company,CNPC,Xi′an 710021,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油长庆油田分公司油气工艺研究院,陕西西安710021

出　　处：《断块油气田》2023年第4期545-551,共7页Fault-Block Oil & Gas Field

基　　金：海洋石油高效开发国家重点实验室开放基金项目“稠油超临界多源多元热流体开采机理研究”(CCL2018RCPS0017RON)。

摘　　要：利用蒸汽驱开发海上稠油,存在能耗高、热利用率低、效果差等问题。超临界多元热流体作为一种新兴的注入热介质,可有效解决上述问题。其主要成分为超临界蒸汽、超临界N_(2)及CO_(2),是由有机废液在温度373.85~699.85℃、压力22.1~30.0 MPa的空气和超临界蒸汽环境中气化及燃烧而成。但是,目前国内外相关研究仍处于初级阶段,缺乏有效的物理模拟装置和方法,超临界多元热流体驱的可行性尚待进一步评估,其驱油特征及参数影响规律也不清楚。为此,文中首次利用自主研制的大型超临界多元热流体驱替实验装置,研究超临界多元热流体驱油过程,揭示了最终采收率变化、超临界多元热流体腔发育和剩余油分布等驱油特征,并阐明了超临界多元热流体注入温度及压力变化对开发效果的影响规律。研究结果表明:与蒸汽驱相比,采用超临界多元热流体驱油,最终采收率提高了13.06百分点,可有效降低稠油黏度,延缓突破时间,扩大波及范围,降低剩余油饱和度和热损失,是一种有效的海上稠油开发技术。随着注入温度的升高,超临界多元热流体波及范围增大,最终采收率提高,但同时焦炭产量增加;而注入压力的增加可改善驱替效果,并抑制焦炭生成。文中研究结果为海上稠油超临界多元热流体驱油的现场实施奠定了理论基础。Conventional steam flooding has some challenges such as high energy consumption,low heat utilization and poor performance during the development of offshore heavy oil reservoirs.The above challenges can be effectively solved by supercritical multiple-thermal fluids as a novel thermal agent.The main components of that are supercritical steam,supercritical N_(2) and supercritical CO_(2),which are produced by the gasification and combustion of organic waste fluid in the environment of air and supercritical steam at 373.85-699.85℃and 22.1-30.0 MPa.Nevertheless,the correlational research at present,both domestically and internationally,remains at a preliminary stage because of a dearth of efficacious physical simulation setup and techniques.Further evaluation is required to determine the feasibility of utilizing supercritical multiple-thermal fluids,while the flooding characteristics and the influence of parameters remain unclear.In this paper,a self-developed large experimental setup was used to to examine the flooding mechanisms of supercritical multiple-thermal fluids.Through this investigation,the flooding characteristics,including change of oil recovery,development of the supercritical multiple-thermal fluids cavity,and residual oil distribution,were revealed.And the influence rule of injection temperature and pressure on development effect was clarified.The findings indicated that,in comparison to conventional steam flooding,the oil recovery ratio of supercritical multiple-thermal fluids flooding can increase by 13.06%.This technology can decrease effectively heavy oil viscosity,delay occurrence of breakthrough,expand sweep area and decrease residual oil saturation and heat loss,which is an effective development technology for offshore heavy oil reservoirs.In addition,the growing injection temperature can lead to an increase in both the sweep area and the oil recovery.However,it also results in an growing coke production.And an increase in pressure has a positive effect on oil recovery while controlling coke p

关 键 词：超临界多元热流体 海上稠油 驱替特征 物理模拟 温度 

分 类 号：TE345[石油与天然气工程—油气田开发工程]