油页岩传热各向异性与原位传导热采模拟分析  

Analysis of Anisotropic Heat Transfer Properties of Oil Shale and Simulation of In-situ Thermal Conduction Exploitation

作　　者：张轩豪 俞凌杰 马中良[1,2] 李艺龙[3,4] 姜星[3,4] ZHANG Xuanhao;YU Lingjie;MA Zhongliang;LI Yilong;JIANG Xing(Key Laboratory of Petroleum Accumulation Mechanisms,SINOPEC,Jiangsu 214126,China;Research Institute of Petroleum Geology,SINOPEC,Jiangsu 214126,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of In-situ Property Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]中国石油化工股份有限公司油气成藏重点实验室,江苏无锡214126 [2]中国石油化工股份有限公司石油勘探开发研究院,江苏无锡214126 [3]太原理工大学矿业工程学院,太原030024 [4]太原理工大学原位改性采矿教育部重点实验室,太原030024

出　　处：《太原理工大学学报》2024年第2期260-266,共7页Journal of Taiyuan University of Technology

基　　金：国家重点研发计划项目(2019YFA0705501);山西省研究生实践创新项目2023SJ083。

摘　　要：【目的】油页岩原位开采过程中传热效率差,各向异性差异显著,油页岩原位开采中存在各向异性传热差异问题。【方法】以新疆巴里坤油页岩制标准样本试件,采取多种室内试验手段对不同温度下块状油页岩水平、垂直层理传热差异进行探究,并进行原位开采模拟。【结果】实验结果表明:1)随着温度升高,各层理方向热传导系数均呈“降低”趋势,但油页岩平行层理方向的热传导系数均大于垂直层理方向;2)随温度升高,比热容先升高再降低,当温度为400℃时,油页岩比热容值最大;3)结合显微CT图,随着温度的升高,裂隙增多对垂直层理方向热量传导的影响大于平行层理方向。基于上述实验测试参数,同时利用COMSOL软件建立油页岩储层原位电加热的“热-固”耦合模型,模拟结果表明:随加热时间的增加,各向异性传热差异逐渐开始呈现;当加热时间为120 d时,加热井附近区域温度上升,并未表现出明显的各向异性;当加热到600 d时,平行层理方向的传热区域明显大于垂直层理方向,呈“椭圆”状;加热到1 440 d时,传热区域小幅度增加,加热井控制区域页岩基本热解完成。【Purposes】In the in-situ mining of oil shale,poor heat transfer efficiency and pro⁃nounced anisotropic differences present challenges.【Methods】In this study,standard samples from Xinjiang's Barikun oil shale are adopted to explore heat transfer variations in horizontal and vertical bedding at different temperatures through indoor experiments,and in-situ mining simulation was con⁃ducted.【Findings】The experimental results show that:1)With the increase of temperature,the heat conduction coefficient of each bedding direction shows a"decreasing"trend,but the heat conduc⁃tion coefficient of parallel bedding direction is greater than that of vertical bedding direction;2)With the increase of temperature,the specific heat capacity first increases and then decreases.When the temperature is 400℃,the specific heat capacity is the maximum;3)Combined with the micro-CT im⁃age,with the increase of temperature,the influence of increasing cracks on the heat conduction in the vertical bedding direction is greater than that in the parallel bedding direction.On the basis of the above experimental parameters,the"heat-solid"coupling model of in-situ electric heating of oil shale reservoir is established by COMSOL software.The simulation results show that:With the increase of heating time,anisotropic heat transfer difference gradually appears.When heating duration reaches 600 d,the heat transfer area in parallel bedding direction is obviously larger than that in vertical bedding direction,showing an"ellipse"shape.When heating duration reaches 1440 d,the heat transfer area increases slightly,and the pyrolysis of the shale in the heating well control area is basically completed.

关 键 词：油页岩 各向异性 热传导系数 显微CT 数值模拟 

分 类 号：TD[矿业工程]