温度冲击效应诱导干热岩孔裂隙结构演化及损伤破坏机制
TD989; 干热岩型地热能是一种清洁可再生能源,具有稳定高效、永久持续的优点,其开发的主要瓶颈是在深部低孔、低渗热储构造渗流换热裂隙通道.常规水力压裂方法在深部高应力束缚下起裂压力高,裂缝形态单一、难扩展.液氮循环冷冲击方法是通过周期向热储注入液氮,利用液氮对热储的温度冲击效应诱导强热应力,形成复杂裂隙网络.为研究温度冲击效应对干热岩的损伤破坏机制,对干热岩进行了液氮循环冷冲击处理,测试了温度分布、孔隙结构及力学特征变化,分析了"温度冲击-孔隙发育-力学损伤"级联破坏机制,结果表明:液氮冷冲击造成干热岩温度场时空剧变,降温速率高,温度梯度大,诱导热应力最高可达 6.75...
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| Published in | 煤炭学报 Vol. 49; no. 12; pp. 4855 - 4872 |
|---|---|
| Main Authors | , , , , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国矿业大学低碳能源与动力工程学院,江苏徐州 221116%中国矿业大学安全工程学院,江苏徐州 221116
01.12.2024
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-9993 |
| DOI | 10.13225/j.cnki.jccs.2024.0072 |
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| Abstract | TD989; 干热岩型地热能是一种清洁可再生能源,具有稳定高效、永久持续的优点,其开发的主要瓶颈是在深部低孔、低渗热储构造渗流换热裂隙通道.常规水力压裂方法在深部高应力束缚下起裂压力高,裂缝形态单一、难扩展.液氮循环冷冲击方法是通过周期向热储注入液氮,利用液氮对热储的温度冲击效应诱导强热应力,形成复杂裂隙网络.为研究温度冲击效应对干热岩的损伤破坏机制,对干热岩进行了液氮循环冷冲击处理,测试了温度分布、孔隙结构及力学特征变化,分析了"温度冲击-孔隙发育-力学损伤"级联破坏机制,结果表明:液氮冷冲击造成干热岩温度场时空剧变,降温速率高,温度梯度大,诱导热应力最高可达 6.75 MPa;循环冷冲击过程干热岩孔隙数量增加,尺寸扩展,微、中孔增加最明显,孔隙率最高可达 10.45%,而高温差和多冷冲击次数作用下干热岩大孔及裂隙数量增加,形成裂隙网络;这进一步导致干热岩塑性增强,抗拉强度降低,最低仅 1.70 MPa,损伤阈值更小.温度冲击诱导矿物晶粒收缩,在晶粒边界产生拉伸应力,当其值超过抗拉强度,就会导致张拉裂隙产生.孔裂隙主要出现在石英晶粒边界及内部.温度是干热岩损伤的主控因素,冷冲击次数能够保证干热岩的持续损伤.矿物晶粒的热膨胀系数差异、液氮的快速降温、循环冲击的疲劳损伤作用是造成干热岩温度冲击损伤的主要原因. |
|---|---|
| AbstractList | TD989; 干热岩型地热能是一种清洁可再生能源,具有稳定高效、永久持续的优点,其开发的主要瓶颈是在深部低孔、低渗热储构造渗流换热裂隙通道.常规水力压裂方法在深部高应力束缚下起裂压力高,裂缝形态单一、难扩展.液氮循环冷冲击方法是通过周期向热储注入液氮,利用液氮对热储的温度冲击效应诱导强热应力,形成复杂裂隙网络.为研究温度冲击效应对干热岩的损伤破坏机制,对干热岩进行了液氮循环冷冲击处理,测试了温度分布、孔隙结构及力学特征变化,分析了"温度冲击-孔隙发育-力学损伤"级联破坏机制,结果表明:液氮冷冲击造成干热岩温度场时空剧变,降温速率高,温度梯度大,诱导热应力最高可达 6.75 MPa;循环冷冲击过程干热岩孔隙数量增加,尺寸扩展,微、中孔增加最明显,孔隙率最高可达 10.45%,而高温差和多冷冲击次数作用下干热岩大孔及裂隙数量增加,形成裂隙网络;这进一步导致干热岩塑性增强,抗拉强度降低,最低仅 1.70 MPa,损伤阈值更小.温度冲击诱导矿物晶粒收缩,在晶粒边界产生拉伸应力,当其值超过抗拉强度,就会导致张拉裂隙产生.孔裂隙主要出现在石英晶粒边界及内部.温度是干热岩损伤的主控因素,冷冲击次数能够保证干热岩的持续损伤.矿物晶粒的热膨胀系数差异、液氮的快速降温、循环冲击的疲劳损伤作用是造成干热岩温度冲击损伤的主要原因. |
| Abstract_FL | The geothermal resource originating from the hot dry rock is a form of clean and renewable energy,which has the advantages of stable,efficient,and permanent.The foremost obstacle hindering its development resides in the con-struction of fracture channels for seepage and heat transfer within deep reservoirs characterized by low porosity and per-meability.The conventional hydraulic fracturing method has high initiation pressure,single fracture shape,and difficult expansion under the constraint of deep high stress.Therefore,a liquid nitrogen cyclic cold shock method was proposed in this study.Liquid nitrogen is injected into the high-temperature rock periodically,inducing robust thermal stress through the temperature shock effect,thereby forming a complex fracture network.To study the damage mechanism of hot dry rock influenced by the temperature shock effect,the hot dry rock was subjected to a cyclic liquid nitrogen cooling treat-ment.The changes in temperature distribution,pore structure,and mechanical characteristics were tested and the cascade failure mechanism of"temperature shock-pore development-mechanical damage"was analyzed.The main conclusions are as follows:liquid nitrogen cold shock causes a temporal-spatial drastic change in the temperature field,marked by a high cooling rate and a large temperature gradient,and the induced thermal stress reaches up to 6.75 MPa.The number of pores increases,the size expands,and the increase in micro and mesopores is most significant,with a maximum porosity of 10.45%.Under the influence of high-temperature differences and multiple cold shocks,the number of macropores and fractures increases,giving rise to the formation of an interconnected network of fractures.This further increases the plasti-city of the hot dry rock,reducing the tensile strength to only 1.70 MPa with a smaller damage threshold.Temperature shock induces mineral grain shrinkage,generating tensile stress at the boundaries between grains.When its value exceeds the tensile strength,tensile cracks will be generated.Pores and cracks mainly occur at the boundaries and within the interi-or of quartz grains.Temperature is the main controlling factor of hot dry rock damage,and the cyclic cold shocks serve to ensure sustained damage.The differences in the thermal expansion coefficients of mineral grains,the rapid cooling of li-quid nitrogen,and the fatigue damage of cyclic shock are the main reasons for the damage of hot dry rock. |
| Author | 王宇 来永帅 王帅 孙勇 唐伟 郑仰峰 陈爱坤 丛钰洲 翟成 |
| AuthorAffiliation | 中国矿业大学低碳能源与动力工程学院,江苏徐州 221116%中国矿业大学安全工程学院,江苏徐州 221116 |
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| Author_FL | WANG Shuai LAI Yongshuai CHEN Aikun SUN Yong CONG Yuzhou TANG Wei WANG Yu ZHENG Yangfeng ZHAI Cheng |
| Author_FL_xml | – sequence: 1 fullname: SUN Yong – sequence: 2 fullname: ZHAI Cheng – sequence: 3 fullname: CONG Yuzhou – sequence: 4 fullname: ZHENG Yangfeng – sequence: 5 fullname: TANG Wei – sequence: 6 fullname: WANG Shuai – sequence: 7 fullname: LAI Yongshuai – sequence: 8 fullname: WANG Yu – sequence: 9 fullname: CHEN Aikun |
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| DocumentTitle_FL | Pore fracture structure evolution and damage failure mechanism of hot dry rock induced by temperature impact effect |
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| Keywords | 增强型地热系统 损伤机制 力学特征 damage mechanism hot dry rock mechanical charac-teristics 液氮冷冲击 liquid nitrogen cold shock pore structure enhanced geothermal system 干热岩 孔隙结构 |
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| Publisher | 中国矿业大学低碳能源与动力工程学院,江苏徐州 221116%中国矿业大学安全工程学院,江苏徐州 221116 |
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