大庆石油地质与开发2024，Vol.43Issue(6)：128-135,8.DOI:10.19597/J.ISSN.1000-3754.202308063
页岩(致密)油藏注CO2吞吐作用距离实验
Experiment on CO2 injection huff-and-puff distance in shale(tight)oil reservoirs
摘要
Abstract
In order to clarify development effect of CO2 injection huff-and-puff in shale(tight)oil reservoirs,labora-tory CO2 huff-and-puff experiments are carried out based on 14 shale(tight)samples from Songliao Basin and Ordos Basin.Combined with nuclear magnetic resonance technology,T2 spectra of samples at different stages of huff-and-puff are obtained.T2 spectra variation of oil within the cores in different conditions is analyzed to obtain relationship between CO2 huff-and-puff recovery degree and huff-and-puff time,determine time required for unit distance of CO2 injection huff-and-puff in the cores,and calculate effective distance of CO2 injection huff-and-puff in reservoirs combined with field application.The results show that time required for unit distance of CO2 injection huff-and-puff significantly increases with permeability decrease.Time required for huff-and-puff unit distance in cores of Ordos Basin shows logarithmic relationship with permeability time.Required time for average huff-and-puff distance of 1.19 cm in 6 sandwiched cores is 1.80 h.For pure shale cores of Block A in Songliao Basin,average huff-and-puff distance is 1.250 cm and required time is 39.00 h,which is much higher than 2.06 h for tight oil cores of Block A.Average huff-and-puff distance of pure shale cores of Block B in Songliao Basin is 1.24 cm and required time is 1.76 h.For Ordos Basin shale reservoirs,effective distance of CO2 injection huff-and-puff development for a month reaches 6.55 m,much higher than 0.50 m for pure shale reservoirs in Songliao Basin.The research provides refer-ence evidence for reservoir property evaluation and development effect of tight reservoirs.关键词
页岩油藏/致密油藏/CO2吞吐距离/纯页岩型页岩/夹层型页岩/核磁共振Key words
shale reservoir/tight reservoir/CO2 huff-and-puff distance/pure shale/sandwiched shale/nuclear magnetic resonance分类
能源科技引用本文复制引用
黄千慧,孟焕,李海波,杨正明,邢济麟,陈波,李杰,薛伟,姚兰兰,杜猛..页岩(致密)油藏注CO2吞吐作用距离实验[J].大庆石油地质与开发,2024,43(6):128-135,8.基金项目
中国石油天然气股份有限公司CCUS重大科技专项"CCUS驱油地质体精细描述及油藏工程关键技术研究"(2021ZZ01-03) （2021ZZ01-03）
中国石油长庆油田公司项目"页岩油储层物性参数测试及增效吞吐开采技术研究"(2023DJ0927). （2023DJ0927）
