火山岩油藏超临界二氧化碳吞吐实验研究——以XQ井区为例  

Experimental Study on Supercritical Carbon Dioxide Huff and Puff in Volcanic Reservoir——Taking XQ Well Area as an Example

作　　者：商玉锋 叶习文 刘德华[1] 郑亚峰 SHANG Yu-feng;YE Xi-wen;LIU De-hua;ZHENG Ya-feng(School of Petroleum Engineering,Yangtze University,Wuhan 430100,China;CNOOC Tianjin Branch,Tianjin 300450,China)

机构地区：[1]长江大学石油工程学院,武汉430100 [2]中海石油有限公司天津分公司,天津300450

出　　处：《当代化工》2022年第9期2207-2211,共5页Contemporary Chemical Industry

基　　金：中石油重大科技专项,火山岩油藏效益开发关键技术研究与应用(项目编号:2017E-0405)。

摘　　要：鉴于准噶尔盆地XQ井区火山岩油藏采油速度递减快、油藏压力无法保持、采出程度低的问题,探索采用超临界CO_(2)吞吐开发方式进行目标油藏岩心的长岩心实验研究,完成衰竭后超临界CO_(2)吞吐实验。结果表明:超临界CO_(2)吞吐技术可以有效提高火山岩油藏采收率,开发效果主要集中在前3轮次吞吐,贡献率达到90%左右,但多轮次(超过3轮)吞吐采油效果不佳;在一定条件下,适当延长焖井时间,可以一定程度上提高采收率;CO_(2)吞吐采收率随其注入量的增加而逐步提高,但当CO_(2)注入量超过0.411 HCPV后,采收率的提高幅度很小;随着油藏的持续开采,其含油饱和度不断减小,CO_(2)对原油的作用效果也就会逐渐减弱,建议在开采初期直接对油藏进行CO_(2)吞吐,采油效果最佳。In view of the problems of rapid decline of oil production rate,being unable to maintain reservoir pressure and low recovery degree of volcanic reservoir in XQ well block of Junggar basin,the long core experimental study of target reservoir core was carried out by using supercritical CO_(2)huff and puff development method,and the supercritical CO_(2)huff and puff experiment after depletion was completed.The experimental results showed that,supercritical CO_(2)huff and puff technology could effectively improve the recovery of volcanic reservoir,the development effect was mainly concentrated in the first three rounds of huff and puff,the contribution rate was about 90%,but the effect of multiple rounds of huff and puff was not good;Under certain conditions,the recovery factor could be improved to a certain extent by appropriately prolonging the soaking time;The EOR of CO_(2)huff and puff increased gradually with the increase of CO_(2)injection amount,but when the CO_(2)injection amount exceeded 0.411 HCPV,the EOR increased very little;With the continuous development of the reservoir,the oil saturation was decreasing,and the effect of CO_(2)on the crude oil gradually weakened.It was suggested that CO_(2)huff and puff should be carried out directly in the early stage of the production to achieve the best oil recovery effect.

关 键 词：火山岩油藏 超临界CO_(2)吞吐 提高采收率 吞吐实验 长岩心实验 

分 类 号：TE135[石油与天然气工程—油气勘探]