实时高温作用下油页岩力学及破裂特性演变规律研究

doi:10.13722/j.cnki.jrme.2024.0143

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摘要为获得油页岩原位热解过程中温度和层理面对其微观结构、宏观力学参数及破裂特性的影响，利用自主研发的实时高温热力耦合CT扫描装置以及高温岩石力学测试系统，在20 ℃～600 ℃范围内对垂直层理和平行层理2个方向的油页岩进行热力耦合CT扫描和单轴压缩试验。结果表明：(1) 在20 ℃～400 ℃范围，油页岩所受应力状态是决定孔隙裂隙扩展规律的关键因素，载荷垂直层理条件下孔隙孔径与裂隙开度均先减小后增大；而平行层理条件下则表现为原生裂隙沿层理扩展并伴随新生裂隙出现。温度超过400 ℃后，热解作用是造成微观结构改变的主要原因，2种加载方式下孔隙、裂隙的尺寸、数量及连通性随温度升高均快速提升。(2) 垂直层理和平行层理加载时油页岩的抗压强度、弹性模量以及泊松比均表现为先减小后增加。其中，抗压强度和弹性模量均在400 ℃达到最小值，而垂直层理方向泊松比和平行层理方向泊松比分别在500 ℃和200 ℃达到最小值。(3) 除垂直层理方向裂纹破坏应力阈值随温度升高表现为先增加后减小再增加外，垂直层理加载时裂纹起裂应力阈值与平行层理加载时起裂应力阈值以及裂纹破坏应力阈值均表现为先减小后增加，并在400 ℃达到最小值。该研究成果可为原位热解油页岩工艺实时过程中储层改造以及固井环节提供基础数据。

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	杨少强1
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	张庆伦1
	杨栋3
	王磊3

关键词 ：岩石力学, 热力耦合, 油页岩, 各向异性, 热破裂, 单轴压缩, 裂隙扩展

Abstract：In order to obtain the effects of temperature and bedding plane on the microstructure，macroscopic mechanical parameters and fracture characteristics during the in-situ pyrolysis of oil shale，the self-developed real-time high-temperature thermo-mechanical coupling CT scanning device and high-temperature rock mechanics test system were used to carry out thermo-mechanical coupling CT scanning and uniaxial compression tests on oil shale in two directions of perpendicular to bedding and parallel to bedding from 20 ℃ to 600 ℃. The results reveal that：(1) Up to 400 ℃，the stress state of oil shale is the key factor to determine the law of pore fracture propagation. Under perpendicular loading to the bedding，the pore diameter and fracture aperture initially decreasing and then increasing with temperature increasing. Under parallel loading to the bedding，primary fractures propagate along the bedding planes，accompanied by the emergence of new fractures. (2) When loading in both perpendicular to and parallel bedding directions，the compressive strength，elastic modulus，and Poisson's ratio of oil shale initially decreasing and then increasing. Specifically，the compressive strength and elastic modulus reach their minimum values at 400 ℃，whereas the Poisson?s ratio attains its minimum at 500 ℃ and 200 ℃ when loading perpendicular to bedding and parallel to bedding，respectively. (3) Except for the the fracture damage stress during perpendicular bedding loading initially increases，then decreases，and subsequently increases with temperature，the initial stress during perpendicular bedding loading ，parallel bedding loading ，and damage stress decrease initially and then increase，reaching their minimum values at 400 ℃. These research findings provide essential data for reservoir reconstruction and cementing technology in the in-situ mining process of oil shale.

Key words： rock mechanics thermo-mechanical coupling oil shale anisotropy thermal cracking uniaxial compression fracture propagation

引用本文:

杨少强1，2，张庆伦1，杨栋3，王磊3. 实时高温作用下油页岩力学及破裂特性演变规律研究[J]. 岩石力学与工程学报, 2024, 43(11): 2700-2711.
YANG Shaoqiang1，2，ZHANG Qinglun1，YANG Dong3，WANG Lei3. Research on the evolution law of mechanics and fracture characteristics of oil shale under real-time high temperature conditions. , 2024, 43(11): 2700-2711.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2024.0143 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I11/2700

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