摘要
在目前的CO_(2)吞吐实验研究中大多数进行常规吞吐参数的评价,对于边水稠油油藏CO_(2)吞吐实验研究较少,对于驱替吞吐协同开采方式的实验研究更少,为明确室内边水稠油油藏注CO_(2)提高采收率的效果,以普通稠油油样为例,设计并开展注CO_(2)吞吐实验,研究了转驱时机的影响,并对比了驱替吞吐协同开采方式(保压注水/注气+CO_(2)吞吐)下的开发效果,其中保压注水模拟边水侵的影响,保压注气目的是对比水驱和CO_(2)驱的开发效果。实验结果表明:CO_(2)注入量、焖井时间都存在一个最优值,当含水率低于50%时,开展CO_(2)吞吐效果最好,但如果考虑水驱+CO_(2)吞吐两个产油阶段,则水驱至含水率98%时,所得的总采收率最高;对于保压注水/注气+吞吐方式,可以发挥边底水驱机理+CO_(2)溶胀降机理,CO_(2)驱的驱油效率要高于水驱,该实验所得结果对边水稠油油藏实施CO_(2)吞吐具有一定的借鉴意义。
At present,most of the experimental studies on CO_(2)huff-puff focus on the evaluation of the conventional huff and puff parameters.There are few experimental studies on CO_(2)huff and puff in edge-water heavy oil reservoirs,and even fewer on the coordinated recovery mode of displacement and huff-puff.In order to clarify the effect of CO_(2)injection to enhance oil recovery in edge-water heavy oil reservoirs in the laboratory,by taking ordinary heavy oil samples as an example,CO_(2)huff-puff experiments were designed and carried out to study the influence of the displacement timing.The development effect of coordinated displacement and huff-puff production mode(pressuremaintaining water injection or gas injection+CO_(2)huff-puff)is compared,in which the pressure-maintaining water injection simulates the influence of edge water invasion,and the purpose of pressure-maintaining gas injection is to compare the development effects of water flooding with CO_(2)flooding.The experimental results show that there is an optimal value for both CO_(2)injection amount and well soaking timing.When the water cut is lower than 50%,the CO_(2)huff-puff effect is the best.However,if the two oil production stages of water drive+CO_(2)huff-puff are considered,the total recovery efficiency is the highest when the water drive reaches 98%water cut.For the pressuremaintaining water injection or gas injection+CO_(2)huff-puff mode,the mechanism of edge-bottom water flooding and CO_(2)swelling reduction can be exerted,and the oil displacement efficiency of CO_(2)flooding is higher than that of water flooding.The results obtained in this experiment provide some reference for the implementation of CO_(2)huff-puff in edge-water heavy oil reservoirs.
作者
李陈洋
LI Chenyang(Institute of Exploration and Development,SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai 200120,China)
出处
《海洋石油》
2025年第2期38-44,共7页
Offshore Oil
关键词
边水油藏
稠油
CO_(2)吞吐
机理研究
驱替吞吐协同开采
edge-water reservoir
heavy oil
CO_(2)huff-puff
mechanism research
displacement and coordinated displacement and huff-puff production
作者简介
李陈洋,男,1996年生,硕士,助理研究员,2022年毕业于中国石油大学(华东)石油与天然气工程专业,主要从事石油与天然气开发研究。E-mail:lichenyang.shhy@sinopec.com。
