页岩(致密)油藏注CO_(2)吞吐作用距离实验  

Experiment on CO_(2)injection huff⁃and⁃puff distance in shale(tight)oil reservoirs

作　　者：黄千慧 李海波[2,3] 杨正明[2,3] 邢济麟[4] 陈波 李杰 薛伟[4] 姚兰兰 杜猛 孟焕[2,3] 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)

机构地区：[1]中国科学院大学工程科学学院,北京100049 [2]中国科学院渗流流体力学研究所,河北廊坊065007 [3]中国石油勘探开发研究院,北京100083 [4]中国石油吉林油田公司勘探开发研究院,吉林松原138000 [5]中国石油长庆油田公司,陕西西安710200

出　　处：《大庆石油地质与开发》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)。

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.

关 键 词：页岩油藏 致密油藏 CO_(2)吞吐距离 纯页岩型页岩 夹层型页岩 核磁共振 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]