摘要
为了明确页岩(致密)油藏注CO_(2)吞吐开发效果,基于松辽盆地、鄂尔多斯盆地的14块页岩(致密)岩样开展了室内CO_(2)吞吐实验,结合核磁共振技术,获得岩样吞吐不同阶段的T2谱;通过分析不同状态下岩心内油的T2谱变化,获得CO_(2)吞吐采出程度与吞吐时间的关系,确定岩心注CO_(2)单位吞吐距离所需时间,并结合现场计算储层注CO_(2)吞吐的有效作用距离。结果表明:随渗透率的降低,注CO_(2)吞吐单位距离所需时间有明显增大的趋势;鄂尔多斯盆地岩心单位吞吐距离所需时间与渗透率时间呈对数关系,6块夹层型岩心平均吞吐作用距离1.19 cm所需时间为1.80 h;松辽盆地A区块纯页岩型岩心平均吞吐距离为1.250 cm,所需时间为39.00 h,远高于松辽盆地A区块致密油岩心的2.06 h;松辽盆地B区块纯页岩型页岩岩心平均吞吐距离为1.24 cm,所需时间为1.76 h;鄂尔多斯盆地页岩油藏在注CO_(2)吞吐开发一个月内,有效作用距离最高可达6.55 m,远高于松辽盆地纯页岩型油藏的0.50 m。研究成果为致密油藏储层物性评价及开发效果改善提供参考依据。
In order to clarify development effect of CO_(2)injection huff-and-puff in shale(tight)oil reservoirs,labora tory CO_(2)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-andpuff are obtained.T2 spectra variation of oil within the cores in different conditions is analyzed to obtain relationship between CO_(2)huff-and-puff recovery degree and huff-and-puff time,determine time required for unit distance of CO_(2)injection huff-and-puff in the cores,and calculate effective distance of CO_(2)injection huff-and-puff in reservoirs combined with field application.The results show that time required for unit distance of CO_(2)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 CO_(2)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 reference evidence for reservoir property evaluation and development effect of tight reservoirs.
作者
黄千慧
李海波
杨正明
邢济麟
陈波
李杰
薛伟
姚兰兰
杜猛
孟焕
HUANG Qianhui;LI Haibo;YANG Zhengming;XING Jilin;CHEN Bo;LI Jie;XUE Wei;YAO Lanlan;DU Meng;MENG Huan(School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Porous Flow and Fluid Mechanics,Langfang 065007,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;Exploration and Development Research Institute of PetroChina Jilin Oilfield Company,Songyuan 138000,China;PetroChina Changqing Oilfield Company,Xi’an 710200,China)
出处
《大庆石油地质与开发》
CAS
北大核心
2024年第6期128-135,共8页
Petroleum Geology & Oilfield Development in Daqing
基金
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)
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)。
