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Analysis of impact pressure,rock-breaking effect,and ground vibration induced by the disposable CO_(2)fracturing tube

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3099-3121页

作者： Chong Yu Yongan Ma Haibo Li shouchun deng Yafei Hao Kuan Zhu State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Explosives Co.Ltd. Changsha410000China Wuhan University of Science and Technology Wuhan430000China Gezhouba EXPL(Hunan)Technology Co.Ltd. Liuyang410300China

The technology of expansion fracturing with liquid CO_(2)(EFLCO_(2))has attracted increasing attention due to reduced vibration and *** disposable fracturing tube has been developed and is gradually replacing the Cardox ***,there is a lack of impact pressure testing of disposable tubes under real working conditions,selection of gas explosion design parameters,and systematic analysis of blasting *** limitation has constrained the widespread application of disposable fracturing tubes in engineering.A joint monitoring of the pressure-time curves in the disposable tubes and boreholes was *** rock-breaking effect of varying hole spacing parameters in the EFLCO_(2)design was analyzed,and a systematic study was carried out on the vibration peak value,frequency,and energy *** results show that(1)the pressure distribution characteristics,stress peak value,and duration in the disposable tubes are different from those of Cardox tubes,which show multi-peak distribution,low-pressure peak value,and short *** correlation between the pressure in the disposable tube,filling pressure,and liquid CO_(2)weight is established,and a theoretical calculation method for the borehole wall pressure is proposed;(2)The hole spacing in rocks of different hardness is suggested;and(3)At the same scale distance,the peak particle velocity(PPV)caused by EFLCO_(2)(PPVCO_(2))is significantly smaller than that caused by blasting(PPVexplosive).The ratio of PPVexplosive to PPVCO_(2)is a power function related to scale distance,and a distance-related zonality exist in this *** frequency composition of the vibration signal caused by EFLCO_(2)is relatively simple with a narrow frequency *** PPV and energy are mainly concentrated in the low-frequency *** research contributes to the optimization of disposable fracturing tubes,gas explosion design,and vibration hazard control.

关键词： Disposable tube Liquid CO_(2) Impact pressure Hole spacing Vibration effect Cardox tube

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CGM水泥基灌浆料力学特性及动态本构模型

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辽宁工程技术大学学报（自然科学版） 2024年第1期43卷 38-47页

作者：王晓虎于崇邓守春吴家骏中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 中国科学院大学北京100049

为研究C-Type Grout Material(CGM)水泥基灌浆料力学特性,以及在动态加载条件下破坏失效规律,开展一系列静、动态力学测试,标定该材料Holmquist-Johnson-Cook(HJC)动态本构模型参数,基于LS-DYNA软件开展了Split Hopkinson Pressure Bar(SHPB)试验有限元动力模拟。实验结果表明:CGM水泥基灌浆料力学性质稳定,单轴受力条件下表现出明显的脆性,在有围压条件下加载具有显著的弹塑性,动态加载条件下率效应明显,应变率达到119 s^(-1)时,动态峰值强度可提高1.62倍。数值模拟结果表明:使用本文试验数据标定的HJC本构模型参数,可准确预测CGM水泥基灌浆料在不同应变率下破坏前的峰值应力和峰值应变,为该材料在动态冲击作用下应用提供参考依据。

关键词： CGM灌浆料力学试验 HJC 参数标定 LS-DYNA软件

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The elasto-damage theory of the components assembling model

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Science China(Physics,Mechanics & Astronomy) 2009年第1期52卷 139-150页

作者： deng shouchun LIANG NaiGang LU HaiXing Institute of Mechanics Chinese Academy of Sciences(CAS)Beijing 100190China Graduate School of Ordnance Engineering College Shijiazhuang 050003China

The potential energy in materials is well approximated by pair functional which is composed of pair potentials and embedding energy. During calculating material potential energy, the orientational component and the volumetric component are derived respectively from pair potentials and embedding energy. The sum of energy of all these two kinds of components is the material potential. No matter how microstructures change, damage or fracture, at the most level, they are all the changing and breaking atomic bonds. As an abstract of atomic bonds, these components change their stiffness during damaging. Material constitutive equations have been formulated by means of assembling all components' response functions. This material model is called the component assembling model. Theoretical analysis and numerical computing indicate that the proposed model has the capacity of reproducing some results satisfactorily, with the advantages of great conceptual simplicity, physical explicitness, and intrinsic induced anisotropy, etc.

关键词： pair functional pair potentials embedding energy damage anisotropy orientational component volumetric component component assembling model

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Limitations of Lattice Boltzmann Modeling of Micro-Flows in Complex Nanopores

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1808-1822页

作者： ZUO Hong deng shouchun LI Haibo State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100094China

The multiscale transport mechanism of methane in unconventional reservoirs is dominated by slip and transition flows resulting from the ultra-low permeability of micro/nano-scale pores,which requires consideration of the microscale and rarefaction *** continuum-based computational fluid dynamics(CFD)becomes problematic when modeling micro-gaseous flow in these multiscale pore networks because of its disadvantages in the treatment of cases with a complicated *** an alternative,the lattice Boltzmann method(LBM),a special discrete form of the Boltzmann equation,has been widely applied to model the multi-scale and multi-mechanism flows in unconventional reservoirs,considering its mesoscopic nature and advantages in simulating gas flows in complex porous ***,numerous LBM models and slip boundary schemes have been proposed and reported in the *** study investigates the predominately reported LBM models and kinetic boundary *** results of these LBM models systematically compare to existing experimental results,analytical solutions of Navier-Stokes,solutions of the Boltzmann equation,direct simulation of Monte Carlo(DSMC)and information-preservation DSMC(IP_DSMC)results,as well as the numerical results of the linearized Boltzmann equation by the discrete velocity method(DVM).The results point out the challenges and limitations of existing multiple-relaxation-times LBM models in predicting micro-gaseous flow in unconventional reservoirs.

关键词： LBM DVM micro-gaseous flow slip boundary schemes effective viscosity flow regimes

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Edge crack growth of mortar plate specimens under uniaxial loading tests

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第2期11卷 300-313页

作者： Zhenghong Huang shouchun deng Haibo Li Hong Zuo State Key Laboratory of Geomechanics and Geotechinical Engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences University of Chinese Academy of Sciences

In this paper, a compression-to-tension conversion technique is developed by applying predominant mode I loading test, using a servo-controlled compression system. The technique is applied to thin mortar plate specimens of different widths that include a prefabricated crack on either a single side to facilitate unilateral crack propagation, or prefabricated cracks positioned on both sides asymmetrically with respect to the specimen midpoint to facilitate bilateral crack propagation under direct tensile stress with a loading rate of 0.001 mm/s. The results show that the main pathways of unilateral crack propagation governing specimen failure are fluctuated locally, but present an approximately straight line overall in the absence of pre-existing internal defects. However, the pathways of bilateral crack propagation are relatively complex, although they present similar characteristics. Analysis results suggest that bilateral crack propagation can be basically divided into three stages, i.e. a stage of linear propagation, a stage representing deviation from the other crack, and a stage where one crack approaches either the other crack or approaches the opposite edge of the specimen, and thereby forming a continuous crack through the specimen. In addition, the stressestrain curves of bilateral crack specimens do not vary significantly around the point of peak stress prior to specimen failure, which means that the specimens do not fail instantaneously.

关键词： Mortar plate specimen Direct tension test Interaction crack Crack path Crack propagation Stressestrain curve

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Characterization of 3D pore nanostructure and stress-dependent permeability of organic-rich shales in northern Guizhou Depression,China

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 407-422页

作者： Xiaofang Jiang shouchun deng Haibo Li Hong Zuo State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

The three-dimensional(3D)pore structures and permeability of shale are critical for forecasting gas production capacity and guiding pressure differential control in practical reservoir ***,few investigations have analyzed the effects of microscopic organic matter(OM)morphology and 3D pore nanostructures on the stress sensitivity,which are precisely the most unique and controlling factors of reservoir quality in *** this study,ultra-high nanoscale-resolution imaging experiments,*** ion beam-scanning electron microscopy(FIB-SEMs),were conducted on two organic-rich shale samples from Longmaxi and Wufeng Formations in northern Guizhou Depression,*** morphology,porosity of 3D pore nanostructures,pore size distribution,and connectivity of the six selected regions of interest(including clump-shaped OMs,interstitial OMs,framboidal pyrite,and microfractures)were qualitatively and quantitatively *** decay permeability(PDP)measurement was used to investigate the variation patterns of stress-dependent permeability and stress sensitivity of shales under different confining pressures and pore pressures,and the results were then used to calculate the Biot coefficients for the two shale *** results showed that the samples have high OM porosity and 85%of the OM pores have the radius of less than 40 *** OM morphology and pore structure characteristics of the Longmaxi and Wufeng Formations were distinctly *** particular,the OM in the Wufeng Formation samples developed some OM pores with radius larger than500 nm,which significantly improved the *** macroscopic permeability strongly depends on the permeability of OM *** stress sensitivity of permeability of Wufeng Formation was significantly lower than that of Longmaxi Formation,due to the differences in OM morphology and pore *** Biot coefficients of 0.729 and 0.697 were obtained for the Longmaxi and Wufeng Formations,respectively.

关键词： Focused ion beam scanning electron microscopy(FIB-SEM) Three-dimensional(3D)reconstruction Pulse decay permeability(PDP) Stress sensitivity Wufeng-Longmaxi formation

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页岩储层甲烷原位燃爆压裂理论与技术研究进展

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中国矿业大学学报 2024年第3期53卷 435-455页

作者：翟成曲占庆邓守春孙伟福罗宁王宇刘厅郭天魁吴飞鹏刘静宋正昶陈尚斌杨威蔡承政中国矿业大学安全工程学院江苏徐州221116 中国矿业大学煤矿瓦斯治理国家工程研究中心江苏徐州221116 中国石油大学(华东)石油工程学院山东青岛2266580 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 北京理工大学爆炸科学与技术国家重点实验室北京京100081 中国矿业大学力学与土木工程学院江苏徐州221116 中国矿业大学低碳能源与动力工程学院江苏徐州221116 中国矿业大学资源与地球科学学院江苏徐州221116 中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州221116

页岩气通常以吸附和游离状态赋存于暗色泥页岩、高碳泥页岩等产气岩中,是一种清洁、高效的能源资源.相比于常规天然气藏,页岩气储层普遍具有低孔隙度、低渗透率的特点,压裂改造提高页岩气采收率是“十四五”期间我国能源开发的重点攻关... 详细信息

页岩气通常以吸附和游离状态赋存于暗色泥页岩、高碳泥页岩等产气岩中,是一种清洁、高效的能源资源.相比于常规天然气藏,页岩气储层普遍具有低孔隙度、低渗透率的特点,压裂改造提高页岩气采收率是“十四五”期间我国能源开发的重点攻关方向.本文创新性提出了一种页岩储层甲烷原位燃爆压裂的技术构想,该技术利用页岩气储层原位解吸产生的甲烷气体与注入的助燃剂协同燃爆,产生高温高压气体冲击压裂页岩储层,创造立体裂缝网络,为页岩气提供高效运移通道.论文全面分析了甲烷原位燃爆压裂的技术构想、可行性以及关键科学问题,包括甲烷-助燃剂协同起爆机制及燃爆压力波传播特性、甲烷燃爆对井筒介质的瞬态冲击动力学响应特征与控制机制、多级燃爆压裂立体缝网逐级构建及效果评价技术等3个关键研究内容,基本涵盖了当前甲烷原位燃爆压裂理论与技术研究的最新进展.研究认为,燃爆冲击载荷作用对页岩复杂缝网的形成和扩展具有显著促进作用,甲烷燃爆压裂不需要消耗大量的压裂液,也不涉及火工品的地上运输和混合等过程,安全、经济和环保优势非常明显,是一项前瞻性、变革性技术,有助于实现我国页岩气开采技术的创新突破.

关键词：深部页岩储层甲烷原位燃爆燃爆压裂理论燃爆压裂技术

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Research on Confining Pressure Sensitivity for Permeability and Slippage Effect of the Longmaxi Formation Shale in the North of Guizhou

Research on Confining Pressure Sensitivity for Permeability ...

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作者： Rui LUO shouchun deng Xiaofang JIANG State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences University of Chinese Academy of Sciences

The Longmaxi Formation shale in the Xishui area of northern Guizhou is a promising target for shale gas *** using a self-developed gas permeameter that considers temperature and pressure,the apparent permeability of shale samples in this shale reservoir was tested,and the slip factor was fitted using the Klinkenberg permeability correction factor *** results show that the confining pressure has a greater impact on the absolute permeability and slippage factor of the shale *** the confining pressure is in the range of 1.5 MPa to 10 MPa,the absolute permeability varies from 1.54 E-17 m to 2.35 E-21 m,and the slip factor varies from 0.37 MPa to 0.11 *** shale samples have a significant slippage effect when the confining pressure is less than 5 MPa,and the slippage effect contributes more than 19% to the *** the confining pressure is more than 5 MPa and less than 10 MPa,the influence of the slippage effect is relatively weakened,but the contribution rate is still greater than 9%.

关键词： Northern Guizhou Longmaxi Formation Shale Permeability Slippage Effect Confining Pressure

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Review of 3D Digital Core Modeling Methods and Their Applications in Oil and Gas Reservoirs

Review of 3D Digital Core Modeling Methods and Their Applica...

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作者： Xiaofang JIANG shouchun deng Rui LUO State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences University of Chinese Academy of Sciences

With the help of statistical physics and computer technology,the three-dimensional digital core modeling method can provide a basic model for numerical simulation of pore structure and physical properties of *** digital image of the real rock sample is obtained by scanning the rock sample with appropriate resolution,and the pore structure model inside the rock is reconstructed by the numerical reconstruction *** literature research,this paper introduces ten commonly used 3 d digital core modeling methods in physical experiment method and numerical reconstruction method respectively,and analyzes the advantages and disadvantages of these methods in modeling and the ways of combining *** the modeling of highly heterogeneous and dense rocks in oil and gas reservoirs,especially shale,on the one hand,the combination of resolution of FIB-SEM and nano CT,as well as the combination of imaging regional scale and REV scale should be *** accurate differentiation of organic matter and various mineral categories with the help of RGB value still needs to be *** the other hand,it is necessary to improve the algorithm and put forward more efficient new points in the selection of numerical reconstruction *** example,according to the difference of organic matter and inorganic matter,pore and crack structure and scale,more advantageous methods are used to distinguish modeling and finally *** cross-scale connection between the reconstructed models is also a key problem to be solved in the future.

关键词： Digital core Core scale modeling Physical experiment method Numerical reconstruction method

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甲烷燃爆压裂技术的实验研究

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煤炭学报 2023年第12期48卷 4297-4307页

作者：江堃邓守春李海波中国科学院武汉岩土力学研究所岩土力学与工程国家重点室验室湖北武汉430071 中国科学院大学北京100049

页岩气资源的高效开发事关我国现代化建设全局,承担着助力“双碳”目标实现的重要使命。鉴于水力压裂耗水量大以及压裂液造成地层不可逆污染,寻求一种更为科学绿色的压裂技术已成为国内外专家研究的热点。提出了采用甲烷原位燃爆压裂技... 详细信息

页岩气资源的高效开发事关我国现代化建设全局,承担着助力“双碳”目标实现的重要使命。鉴于水力压裂耗水量大以及压裂液造成地层不可逆污染,寻求一种更为科学绿色的压裂技术已成为国内外专家研究的热点。提出了采用甲烷原位燃爆压裂技术开发页岩气的新思路,该技术利用电火花点火使储层甲烷与泵入的助燃剂发生燃爆,依靠瞬间产生的高压冲击储层岩石进行压裂,使储层产生一定规模且不受地应力控制的复杂裂缝网络。其优势在于可以防止地层污染,减少地面运输费用,有望成为一种高效、环保的低成本无水压裂技术。利用自主设计的包括致裂装置、气体充装、点火控制和数据采集系统在内的甲烷燃爆压裂实验系统开展了大尺寸物模(?2.0 m×1.5 m)的地面压裂实验,记录了致裂管内空腔压力和井壁压力时程曲线,并与爆炸压裂、水力压裂的井筒压力和成缝特征进行对比。结果表明:燃爆过程中管内膛压峰值为495.18 MPa,是充注压力的82.5倍;试样破碎度低且粉碎区小,主裂缝为7~9条,缝宽在厘米级;甲烷燃爆压裂致裂能量充足、影响范围大、对井筒的损害程度可由充注压力控制;与爆炸压裂和水力压裂相比,该技术拥有更长的高压作用时间,更有利于裂缝起裂扩展,裂缝数量多于水力压裂,长度优于爆炸压裂,可获得最佳压裂效果。通过实验研究记录了高初始压力下甲烷-氧气混合物发生燃爆达到的峰值压力和升压速率,验证了甲烷原位燃爆压裂技术开发页岩气的可行性,可为该技术未来的实际应用提供数据参考和技术指导。

关键词：页岩气开发甲烷燃爆压裂裂缝形态物模实验压裂技术

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