摘要
致密油藏资源量大,但储层物性差,单纯依靠衰竭开采存在采出程度低等问题,开发效果不理想。针对上述问题,结合典型致密油藏储层参数,使用数值模拟方法,研究了水平井CO_(2)吞吐开采致密油藏的生产规律。结果表明:(1)CO_(2)吞吐能明显提高日产油水平,最高日产油量提高近4倍,显著改善致密油藏的开采效果;(2)较高的CO_(2)周期注入量和较长的焖井时间下,可获得较高的产油量;随注气速度增加,产油量有一定波动;平均周期产油量和CO_(2)换油率随吞吐轮次增加而降低,开发效果变差;(3)在本文的研究条件下,当CO_(2)周期注入量为3 000 t/d,焖井时间为50 d,注气速度为100 t/d,吞吐轮次为3时,CO_(2)吞吐开采致密油藏的效果较好。本文有助于加强对CO_(2)吞吐开采致密油藏规律的认识。
Tight oil reservoirs are rich in resources but poor in physical properties,and the problems like low recovery degree are quite common during the production of tight oil reservoirs by depletion.In order to solve the problems mentioned above,combing the typical fluid and reservoir parameters,the production performance of the tight oil reservoir developed by cyclic CO_(2) stimulation with a fractured horizontal well was studied.The results show,(1)CO_(2) huff and puff can significantly increase the oil rate level,with the maximum oil rate increased by nearly 4 times,thus improving the production effect of the tight oil reservoir.(2)Higher oil production can be obtained under higher CO_(2) injection amount and longer soaking time.The cumulative oil production fluctuates with the increase of CO_(2) injection rate.The average oil production per cycle and CO_(2) oil exchange ratio gradually decrease as the cycle number increases,indicating a worse production performance.(3)Under the research conditions of this paper,better production performance of the tight oil reservoir can be obtained when the CO_(2) injection amount per cycle is 3000 t/d,the soaking time is 50 d,the CO_(2) injection rate is 100 t/d,and the cycle number is 3.This study is helpful to strengthen the understanding of the production characteristic of the tight oil reservoir by CO_(2) huff and puff.
作者
史晓月
夏志增
杨丽娟
任伟伟
SHI Xiaoyue;XIA Zhizeng;YANG Lijuan;REN Weiwei(Shandong Institute of Petroleum and Chemical Technology,Dongying Shandong 257061,China;Dongsheng Group Co.,LTD of SINOPEC Shengli Oilfield,Dongying Shandong 257000,China)
出处
《石油化工应用》
CAS
2021年第6期48-53,共6页
Petrochemical Industry Application
基金
山东省大学生创新训练项目,项目编号:S202013386033。
关键词
致密油藏
CO_(2)
体积压裂
生产参数
tight oil reservoir
CO_(2)
volume fracturing
operation parameters
