期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到6,029篇文章
< 1 2 … 250 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Theories,technologies,and future prospects of distributed fiber-optic strain monitoring for hydraulic fracturing 认领 引用
1
作者 Tiankui Guo Zunpeng Hu +5 位作者 Ming Chen Yongzan Liu Yuanhang Zhang Linrui Xue Guchang Zhang Yi Zhang 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2026年第2期36-62,共27页
Distributed strain sensing(DSS),benefiting from its high sensitivity,high spatial resolution,real-time capability,and continuous distributed measurement,has become an important technique for hydraulic fracturing diagn... Distributed strain sensing(DSS),benefiting from its high sensitivity,high spatial resolution,real-time capability,and continuous distributed measurement,has become an important technique for hydraulic fracturing diagnostics.To provide a comprehensive understanding of recent advances in DSS for hydraulic fracturing monitoring,this paper reviews three representative DSS technologies,namely low-frequency distributed acoustic sensing(LF-DAS),rayleigh frequency-shift distributed strain sensing(RFS-DSS),and optical frequency domain reflectometry-distributed strain sensing(OFDR-DSS),with respect to their sensing principles,downhole fiber-deployment methods,field applications in hydraulic fracturing,and associated diagnostic theories,and further outlines key directions for future development.The review indicates that:(1)LF-DAS,based on interferometric detection of coherent Rayleigh-scattering phase variations,is primarily sensitive to far-field strain-rate perturbations in offset wells and is therefore well suited for monitoring fracture hits,fracture propagation,and inter-well interference.RFS-DSS,which relies on coherent Rayleigh-scattering spectral-shift interrogation,is designed for high-resolution quasi-static strain measurements in the treatment well and is particularly effective for post-fracturing production monitoring.OFDR-DSS,employing swept-frequency coherent detection,is mainly used in laboratory experiments and numerical-model validation;(2)Downhole fiber-optic deployment has evolved from permanent behind-casing installation to permanent/semi-permanent outside-tubing configurations and fully retrievable inside-tubing configurations.Among these,behind-casing installation provides the best coupling to the formation,outside-tubing installation offers improved maintainability and flexibility,and inside-tubing installation provides the greatest operational convenience;(3)The diagnostic theory of DSS has evolved from qualitative interpretation of field measurements and qualitative multi-physics forward modeling to quantitative inversion of fracture parameters using optimization-based methods.With the integration of artificial intelligence,a comprehensive diagnostic workflow is emerging that consists of physical signal acquisition,forward modeling,inversion and interpretation,and intelligent diagnosis;(4)DSS still faces limitations in spatial coverage and temperature sensitivity.Consequently,multiwell deployment and the integration of DSS with DTS,DAS,microseismic monitoring,and other monitoring techniques are increasingly adopted,making multimodal cooperative monitoring an important direction for future development.Looking ahead,DSS is expected to achieve enhanced sensing performance and more robust diagnostic theories,becoming one of the key technologies for hydraulic fracturing monitoring. 展开更多
关键词 Hydraulic fracturing DSS LF-DAS RFS-DSS OFDR-DSS Downhole deployment Field application Fracturing diagnosis
暂未订购 下载PDF
The influence of microwave irradiation on thermal properties and fracturing mechanism of basalt in rock excavation 认领 引用
2
作者 TANG Rui-feng YANG Ben-gao +4 位作者 XIE Jing YANG Zhu YANG Zun-dong BAI Yan-bo GAO Ming-zhong 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第3期1403-1418,共16页
Microwave fracturing is a promising technique for facilitating the efficient exploitation of deep earth resources while reducing energy consumption and cutter wear during mechanical excavation.In this study,the therma... Microwave fracturing is a promising technique for facilitating the efficient exploitation of deep earth resources while reducing energy consumption and cutter wear during mechanical excavation.In this study,the thermal properties of basalt under six power levels are investigated and the mechanism of microwave fracturing is elucidated through real time monitoring and microstructural analysis.The results show that the failure modes of basalt can be categorized into high-temperature melting failure(>300℃)and low-temperature burst failure(<200℃).High-power microwave irradiation not only altered the failure mode but also modified the relationship between temperature rise and time.The temperature distribution exhibits a wave pattern,making it more prone to inducing transverse tensile cracks.Dehydration of basalt is triggered when the temperature exceeds 200℃,which subsequently promotes the initiation of macroscopic cracks.Microscopically,microwave fracturing is mainly driven by thermal stresses,while steam pressure,especially under high-power conditions,plays a dominant role in the fracturing process.These results are anticipated to provide necessary theoretical and technical support for the efficient exploitation of deep earth resources. 展开更多
关键词 microwave fracturing deep earth resource failure mode thermal properties fracturing mechanism
暂未订购 下载PDF
Characteristics of fracturing fluid water blocking damage in tight gas reservoirs based on two-dimensional NMR T1–T2 认领 引用
3
作者 Xiao-Hang Li Hui Gao +6 位作者 Yong-Gang Xie Hua-Qiang Shi Hua-Zhou Li Teng Li Zhi-Lin Cheng Chen Wang Kai-Qing Luo 《Petroleum Science》 SCIE EI CAS CSCD 2026年第6期3490-3505,共16页
In the development of tight gas reservoirs,effective flowback of fracturing fluids is crucial for enhancing production.However,water blocking damage caused by fluid retention significantly affects reservoir performanc... In the development of tight gas reservoirs,effective flowback of fracturing fluids is crucial for enhancing production.However,water blocking damage caused by fluid retention significantly affects reservoir performance.This study utilizes nuclear magnetic resonance(NMR)T2 and T1-T2 techniques to analyze water blocking damage during flowback,aiming to characterize fluid retention and the degree of water blocking damage.Reservoirs are classified into TypeⅠ,TypeⅡ,and TypeⅢ,based on the physical properties,pore-throat structure,and mineral composition of core.By integrating high-pressure mercury intrusion with NMR T2 spectra,pores are catego rized into macro po res,me so pores,and micro po re s.The results indicate that micropores and mesopores are primary regions for fracturing fluid retention.As the flowback pressure differential increases,water blocking damage decreases,with TypeⅠcores exhibiting lower water blocking damage compared to TypeⅡand TypeⅢcores.Furthermore,the integration of NMR T2 and T1-T2 techniques enabled the establishment of distribution and occurrence charts of hydrogen-containing substances(hydrogen water,bound fluid,and free fluid)in three types of reservoirs.The T1-T2 spectra visualize pore development and fluid retention.During flowback,significant signal changes in bound water region indicate less retained fluid.The macropores have the lowest water blocking(<90%),while meso pores and micropores exceeds 90%.After flowback,meso pores exhibit most significant changes,while micropores have highest degree of water blocking damage,potentially resulting in long-term or permanent water blocking damage.This study investigates the mechanisms of fluid retention and water blocking across pore scales,providing a scientific basis for optimizing fracturing flowback. 展开更多
关键词 Tight gas reservoir NMR T1–T2 Flowback of fracturing fluids Retention of fracturing fluids Degree of water blocking damage Different pore scales
暂未订购 下载PDF
Three-dimensional time-dependent fracturing model for hard rock involving stress-induced anisotropic cracks 认领 引用
4
作者 Chen Fan Xia-Ting Feng +2 位作者 Jun Zhao Chengxiang Yang Mengfei Jiang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3333-3347,共15页
The time-dependent failure of surrounding rock in deep engineering is essentially controlled by the evolution of microcracks,with the pre-existing fracturing state induced by excavation playing a crucial role in the s... The time-dependent failure of surrounding rock in deep engineering is essentially controlled by the evolution of microcracks,with the pre-existing fracturing state induced by excavation playing a crucial role in the subsequent time-dependent fracturing process.From the perspective of microcrack development,it is a continuous,dynamic process.Therefore,taking the microcrack propagation process as the fundamental principle,this paper proposes a novel three-dimensional(3D)time-dependent model for hard rock that can depict the entire fracturing process within a unified theoretical framework.This developed model discards the traditional tri-modal partition method based on deformation,and instead adopts an analysis approach centred on time-dependent tensile and shear fracturing.The results show that the time-dependent deformation of hard rock is the macroscopic manifestation of the progressive evolution of microcracks over time.Under true triaxial stress,the growth tendency of cracks in hard rock is orientation-dependent throughout the entire loading process.This developed model provides a mechanical explanation for key time-dependent fracture characteristics observed in true triaxial creep tests,including the anisotropy of time-dependent deformation and the preferred orientation of macroscopic failure plane,and provides a novel framework for elucidating the time-dependent failure process of hard rock. 展开更多
关键词 Three-dimensional(3D)time-dependent model Continuous fracturing process Microcrack development Time-dependent anisotropic fracturing True triaxial stress
暂未订购 下载PDF
Four-dimensional stress induced by hydraulic fracturing and long-term extraction for shale gas well platforms: Implications for refracturing design 认领 引用
5
作者 Zirui Yin Fengshou Zhang +2 位作者 Xiaohua Wang Lianyang Zhang Haiyan Zhu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4349-4366,共18页
Prior to refracturing,initial hydraulic fracturing and long-term production are performed,resulting in a complex temporal and spatial evolution of the stress field in the reservoir,known as four-dimensional(4D)stress ... Prior to refracturing,initial hydraulic fracturing and long-term production are performed,resulting in a complex temporal and spatial evolution of the stress field in the reservoir,known as four-dimensional(4D)stress evolution.However,the progression and underlying mechanisms of 4D stress evolution remain unclear.Therefore,this paper proposes an innovative simulation method that integrates the mechanical impacts related to hydraulic fracturing and the poroelastic effects associated with long-term extraction.We consider topographic variations,heterogeneous geological properties,and the irregular distribution of hydraulic fractures with different sizes.The method considers the entire process of opening,closing,and propping of hydraulic fractures.Furthermore,the actual shale gas production is precisely simulated by employing the production matching algorithm in conjunction with the bottomhole pressure history of six fractured horizontal wells.We quantitatively analyze the spatiotemporal evolution of the stress field resulting from mechanical and poroelastic effects.The results indicate that due to the mechanical effect,the horizontal stress difference within the region of fracture distribution has diminished by a range of 3.5–4.5 MPa,and the stress rotation angle is deemed negligible,as its peak value is only 4.03°.In addition,the poroelastic effect resulting from gas extraction progressively reduces the horizontal stress difference of the reservoir,most notably in regions adjacent to hydraulic fractures,while causing an increase in the rotation angle.Importantly,the maximum rotation angle generally manifests in the fracturing stages at the toe and heel ends of each well,suggesting that these stages are particularly favorable for refracturing. 展开更多
关键词 Shale gas Hydraulic fracturing Long-term production 4D stress evolution Refracturing
暂未订购 下载PDF
Simulation analysis of hydraulic fracture initiation and propagation mechanisms under mixed-mode and reservoir fracturing 认领 引用 被引量：2
6
作者 Yu Suo Xian-Hang Wei +5 位作者 Yan-Jie Zhao Ying-Jie Wei Shuo Miao Yang Zhao You-Qing Zhu Bin Huang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期220-235,共16页
With the increasing demand for the development of unconventional oil and gas resources,hydraulic fracturing has become a key technology for enhancing reservoir permeability.However,achieving controlled propagation of ... With the increasing demand for the development of unconventional oil and gas resources,hydraulic fracturing has become a key technology for enhancing reservoir permeability.However,achieving controlled propagation of fracture networks remains a significant challenge under complex geological conditions.This study integrates theoretical analysis and finite-discrete element method(FDEM)simulations to investigate mixed-mode mechanisms,plastic zone evolution at fracture tips,and anisotropic mechanical responses of shale.Modified fracture criteria-including a T-stress-integrated Mohr-Coulo mb criterion and maximum circumferential tensile stress criterion are derived and validated through uniaxial compression and Brazilian splitting tests on Longmaxi Formation shale.Results demonstrate that the modified Mohr-Coulomb criterion effectively predicts anisotropic fracture propagation by characterizing tensile-compressive strength differences,while the plastic zone evolution under maximum circumferential tensile stress is significantly influenced by T-stress:positive T-stress(45°-90°)expands the plastic zone,whereas negative T-stress(0°-45°)contracts it.Lower tensile-to-compressive strength ratios lead to larger plastic zones.An FDEM-based horizontal well fracturing model reveals vertical fracture propagation dominated by bedding plane and interbed fracture extension,forming complex networks,while horizontal fractures initially grow independently before deflecting and inte rconnecting under maximum principal stress.Sensitivity analysis of perforation spacing identifies 62.5 mm(16holes/m)as the optimal configuration,achieving ModeⅡ-dominated fracture networks with superior connectivity and stimulation efficiency.Larger spacings(71.4-83.3 mm)result in reduced efficiency or isolated fractures.By coupling stress interference and fluid pressure field dynamics,this study establishes a methodology to balance fracture network complexity and reservoir stimulation efficacy.The findings provide theoretical insights and engineering guidelines for optimizing hydraulic fracturing designs in anisotropic shale gas reservoirs through advanced fracture criteria and FDEM-based multiphysics simulations. 展开更多
关键词 Hydraulic fracturing Mixed-mode Fracture propagation Plastic zone Perforation spacing optimization
暂未订购 下载PDF
Quantitative correlation between stress variation and charge signals of loaded coal and its implication for dynamic fracturing of surrounding rock 认领 引用 被引量：2
7
作者 Jinguo Lyu Zhanpeng Xue +3 位作者 Yishan Pan Lianpeng Dai Zhi Tang Xuebin Wang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第2期313-331,共19页
To address the key scientific challenge of monitoring the dynamic fracturing of surrounding rock in deep roadways,this study systematically investigates the quantitative relationship between stress and charge signals ... To address the key scientific challenge of monitoring the dynamic fracturing of surrounding rock in deep roadways,this study systematically investigates the quantitative relationship between stress and charge signals during coal mass loading.By integrating innovative analytical approaches,introducing quantitative evaluation indices,and developing a charge–stress inversion model,and incorporating underground monitoring practices,significant progress has been achieved in elucidating the correlation between stress variations and charge signals throughout the entire coal mass fracturing process.First,in the field of stress–charge correlation analysis,empirical mode decomposition(EMD)was combined with wavelet coherence analysis for the first time,enabling the removal of slow-varying stress trends while retaining high-frequency fluctuations.This approach allowed for the quantitative characterization of the evolution of coherence between stress variations and charge fluctuations across multiple time scales.Second,coherence skewness and the proportion of high-coherence intervals were innovatively introduced to examine the influence of time scale selection on correlation results.On this basis,a criterion for determining the near-optimal observation scale of charge signals was proposed,providing a quantitative reference for time scale selection in similar signal analyses.Finally,by correlating charge signals with coal damage factors and stress states,a charge-based damage evolution equation was established to achieve effective stress inversion.Combined with in situ monitoring of stress and charge in roadway surrounding rock,this approach revealed the correlation characteristics of stress and charge intensity responses during the dynamic fracturing process.The results indicate,first,that charge signals are not significantly correlated with the absolute stress level of coal but are directly associated with stress variations following coal damage and failure,with the amplitude of charge fluctuations increasing alongside stress fluctuations.Second,coherence between stress and charge signals varies markedly across time scales,with excessively small or large scales leading to distortion,and the scale corresponding to the peak proportion of intervals with coherence>0.8 was identified as the near-optimal observation scale.Third,charge signals can effectively characterize coal damage factors,and the established damage evolution equation can effectively invert stress variation trends.Fourth,in underground roadways,zones of dynamic fracturing in surrounding rock are commonly located in areas where stress concentration overlaps with regions of high charge intensity,further confirming the strong consistency between charge and stress variations.These findings improve the theoretical framework of charge signal responses in loaded coal and provide a scientific basis for precise“stress-charge”monitoring of dynamic disasters,offering practical potential for engineering applications. 展开更多
关键词 Charge Stress Coherence coefficient Time scale Dynamic fracturing
暂未订购 下载PDF
Optimization of multi-cluster fracturing in deep reservoirs based on stress field reconstruction effect 认领 引用 被引量：1
8
作者 Jinbo Li Siwei Meng +3 位作者 He Liu Suling Wang Kangxing Dong Qiuyu Lu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期227-245,共19页
Since rock plasticity under in-situ conditions poses challenges during fracturing stimulation,extensive research is necessary on deep gas and oil reserves,which will be the primary area of future development.This pape... Since rock plasticity under in-situ conditions poses challenges during fracturing stimulation,extensive research is necessary on deep gas and oil reserves,which will be the primary area of future development.This paper created a competitive,multi-cluster fracture propagation model that considered elastoplastic rock deformation and nonlinear fracture characteristics in deep reservoirs.It also proposed an optimal fracture design of“dense fracture distribution,non-uniform perforation and alternating staged fracturing”based on stress field reconstruction.The findings indicated that suitably reducing the spacing between clusters and increasing the number of perforated clusters minimized local in-situ stress variations through stress interference among fractures.This mitigated the limiting effect of plastic deformation on the propagation of hydraulic fractures,demonstrating a viable approach for enhancing the expansion of fractures in deep reservoirs.The elastoplastic fracture propagation mechanism was examined to elucidate the advantages of close-cutting fracturing technology.The impact of various fracture techniques was analyzed using stress field reconstruction.Alternate fracturing displayed a high degree of stress reconstruction with an extensive propagation range,which facilitated the propagation of multiple fracture clusters in the subsequent fracturing section.The findings offer a theoretical basis for fracture design of deep reservoirs. 展开更多
关键词 Deep reservoir Stress field reconstruction Stage multi-cluster fracturing Elastoplastic crack Competitive propagation
暂未订购 下载PDF
A New Approach for Evaluating and Optimizing Hydraulic Fracturing in Coalbed Methane Reservoirs 认领 引用 被引量：1
9
作者 Xia Yan Wei Wang +6 位作者 Kai Shen Yanqing Feng Junyi Sun Xiaogang Li Wentao Zhu Binbin Shi Guanglong Sheng 《Energy Engineering》 EI 2026年第1期417-430,共14页
In the development of coalbed methane(CBM)reservoirs using multistage fractured horizontal wells,there often exist areas that are either repeatedly stimulated or completely unstimulated between fracturing stages,leadi... In the development of coalbed methane(CBM)reservoirs using multistage fractured horizontal wells,there often exist areas that are either repeatedly stimulated or completely unstimulated between fracturing stages,leading to suboptimal reservoir performance.Currently,there is no well-established method for accurately evaluating the effectiveness of such stimulation.This study introduces,for the first time,the concept of the Fracture Network Bridging Coefficient(FNBC)as a novel metric to assess stimulation performance.By quantitatively coupling the proportions of unstimulated and overstimulated volumes,the FNBC effectively characterizes the connectivity and efficiency of the fracture network.A background grid calibration method is developed to quantify the stage-controlled volume,effectively stimulated volume,unstimulated volume,and repeatedly stimulated volume among different stages of horizontal wells.Furthermore,an optimization model is constructed by taking the FNBC as the objective function and the fracturing injection rate and fluid volume as optimization variables.The Simultaneous Perturbation Stochastic Approximation(SPSA)algorithm is employed to iteratively perturb and optimize these variables,progressively improving the FNBC until the optimal displacement rate and fluid volume corresponding to the maximum FNBC are obtained.Field application in a typical CBM multistage fractured horizontal well in China demonstrates that the FNBC increased from 0.358 to 0.539(a 50.6% improvement),with the injection rate rising from 16 m3/min to 24 m3/min and the average fluid volume per stage increasing from 2490 m3 to 3192 m3,significantly enhancing the stimulation effectiveness.This research provides theoretical support for designing high-efficiency stimulation strategies in unconventional reservoirs under dynamic limits. 展开更多
关键词 Coalbed methane FNBC fracturing stimulation parameters background grid method
暂未订购 下载PDF
Fracture initiation and propagation laws of supercritical CO2shock fracturing 认领 引用
10
作者 YU Xing WANG Haizhu +7 位作者 SHI Mingliang WANG Bin DING Boxin ZHANG Guoxin FAN Xuhao ZHAO Chengming STANCHITS Sergey CHEREMISIN Alexey 《Petroleum Exploration and Development》 SCIE 2026年第1期272-284,共13页
To investigate the fracture initiation and propagation behavior of fractures in tight sandstone under the supercritical CO2(SCCO2)shock fracturing,laboratory fracturing experiments were conducted using a true-tr... To investigate the fracture initiation and propagation behavior of fractures in tight sandstone under the supercritical CO2(SCCO2)shock fracturing,laboratory fracturing experiments were conducted using a true-triaxial-like SCCO2shock fracturing system.Computed tomography(CT)scanning and three-dimensional fracture reconstruction were employed to elucidate the effects of shock pressure,pore pressure,and in-situ stress on fracture characteristics.In addition,nuclear magnetic resonance(NMR)transverse relaxation time spectra were used to assess the internal damage induced by SCCO2shock fracturing.The results indicate that,compared with conventional hydraulic fracturing and SCCO2quasi-static fracturing,SCCO2shock fracturing facilitates multidirectional fracture initiation and the formation of complex fracture networks.Increasing shock pressure more readily activates bedding-plane weaknesses,with main and subsidiary fractures interweaving into a dense fracture network.Under the same impulse intensity,elevated pore pressure reduces the effective normal stress and alters stress-wave scattering paths,thereby inducing more branch fractures and enhancing fracture complexity.An increase in differential in-situ stress promotes fracture propagation along the direction of the maximum principal stress,reduces branching,and simplifies fracture morphology.With increasing SCCO2shock pressure,pore volume and connectivity generally increase:small-to-medium pores primarily respond through increased number and enhanced connectivity;when the shock pressure rises to 40-45 MPa,crack coalescence generates larger pores and fissures,which play a dominant role in improving flow pathways and effective storage space,ultimately forming a multiscale pore-fracture network. 展开更多
关键词 supercritical CO2 shock fracturing waterless fracturing fracture initiation fracture propagation
暂未订购 下载PDF
Fracture propagation mechanisms of cross-layer fracturing with directional perforation in off-target horizontal wells 认领 引用
11
作者 Xiao-Hua Wang Liu-Ke Huang +4 位作者 Chang-Heng Li An-An Wu Sheng-Rong Zhu Li Qian Kuan Lu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第5期2622-2638,共17页
Multi-stage fracturing with horizontal wells is a pivotal technique for developing the unconventional reservoirs.Owing to complex geological conditions coupled with inherent limitations in existing drilling technologi... Multi-stage fracturing with horizontal wells is a pivotal technique for developing the unconventional reservoirs.Owing to complex geological conditions coupled with inherent limitations in existing drilling technologies,a significant proportion of horizontal wellbores deviate from the target reservoir,instead inadvertently penetrating adjacent upper and lower interlayers.These misplaced sections are termed thenon-reservoir horizontal wellbore intervals(NRHWI).In this scenario,the cross-layer fracturing with directional perforation(CLFDP)is introduced as an effective stimulation method.Despite its potential,the mechanisms governing fracture initiation and propagation in CLFDP operations remain poorly understood.This study,therefore,develops a three-dimensional(3D)numerical model of CLFDP for Well H inthe Changqing Oilfield,China.The modelspecifically considers a horizontal wellbore positioned within the mudstone interlayer overlyingthe target sandstone reservoir and incorporates realisticperforation geometry.Wesystematicallyinvestigate fracturemorphological characteristics,injection pressure dynamics,and fracture area evolution.The goal is to examine how these parameters are influenced by variations in wellbore location,perforation depth,and perforation spacing.The results demonstrate that a distinctive gourd-shaped fracture yields in the CLFDP case.The horizontal wellbore trajectory should be optimally steered to maximize reservoir contact,leveraging advanced technologies such as rotary steering systems—a critical factor in enhancing stimulation efficiency.In scenarios where the horizontal wellbore deviates from the target reservoir,we recommend employing deep-penetration perforation(with large perforation depth)combined with high-density perforation(reduced perforation spacing)to effectively develop the NRHWl.These outcomes provide essential theoretical underpinnings and technical support to maximally harness the unconventional resources. 展开更多
关键词 Cross-layer fracturing Directional perforation Fracture propagation Horizontal well Unconventional resources
暂未订购 下载PDF
Multiphysics modeling of thermo-hydraulic fracturing during CO2sequestration in multilayered reservoirs at Ordos,China 认领 引用
12
作者 Yi Li Yinjiang Liu +2 位作者 Quanlin Zhou Hao Yu Bin Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1233-1249,共17页
The increase in CO2injectivity and shifting of CO2-absorbing layers in multilayered geological CO2sequestration(GCS)reservoirs in Ordos,China indicate significantpermeability variations in certain layers.To c... The increase in CO2injectivity and shifting of CO2-absorbing layers in multilayered geological CO2sequestration(GCS)reservoirs in Ordos,China indicate significantpermeability variations in certain layers.To capture these system changes,a numerical model incorporating all 21 aquifers and internal aquitards was developed.The monitored pressure was well matched through multiphase and thermalhydraulic-mechanical(THM)coupling numerical simulations by introducing permeability variations.The results revealed that the permeability in the second layer increased on approximately day 13 due to the abrupt pressure buildup and temperature decrease.Even such a low rate of CO2(2.8 kg/s)injected into the low permeability system initiated some fractures and the permeability in the second layer around the wellbore increased by 722 times.The second critical system change occurred on approximately day 386.As demonstrated in the numerical simulation,the substantial injection of cold CO2induced strong thermal stress,leading to rock contraction and the initiation of several cracks.The permeability of the firstlayer around the wellbore unexpectedly increased by 4 orders of magnitude.Since no additional pressure could drive the CO2into the remaining 17 layers,the total storage capability of the multilayered system was reduced.A whole picture of the system variation is fully presented and the underlying mechanisms are analyzed.It is believed that the phenomenon of thermal-hydraulic fracturing observed in this fieldand the simulation procedures will benefitother fluidinjection and production works in various geotechnical settings. 展开更多
关键词 Geological CO2sequestration(GCS) Thermal-hydraulic-mechanical(THM) couplings Thermal-hydraulic fracturing Monitoring analysis Fracture flow Field data
暂未订购 下载PDF
Effect of CO2pre-injection on fracture propagation morphology in shale reservoirs under CO2hybrid fracturing 认领 引用
13
作者 Yu-Xi Zang Feng-Xia Li +5 位作者 Hai-Zhu Wang Zhi-Wen Huang Tong Zhou Jia Cui Ning Li Shou-Ceng Tian 《Petroleum Science》 SCIE EI CAS CSCD 2026年第5期2698-2712,共15页
Supercritical CO2fracturing,as a waterless fracturing technology,is attracting increasing attention in the shale oil reservoir development industry.In recent years,a novel CO2hybrid fracturing method has been pr... Supercritical CO2fracturing,as a waterless fracturing technology,is attracting increasing attention in the shale oil reservoir development industry.In recent years,a novel CO2hybrid fracturing method has been proposed to integrate the advantages of both CO2fracturing and hydraulic fracturing.However,the specific effects of different pre-injection CO2conditions on the physicalproperties,mechanical characteristics,and crack propagation behavior of shale reservoirs remain unclear.This study utilized Chang-7shale samples from the Ordos Basin and conducted CO2hybrid fracturing experiments under simulated high-temperature and high-pressure reservoir conditions,employing a self-developed experimental apparatus.Quantitative analysis of fracture propagation patterns under the influence of CO2preinjection was performed based on CT scanning results.Thefindings reveal that:(1)Among different fracturing fluid systems,conventional hydraulic fracturing exhibits the highest breakdown pressure,pure CO2fracturing is intermediate,while CO2hybrid fracturing significantly reduces the breakdown pressure by 36.2%compared to hydraulic fracturing.(2)Employing CO2hybrid fracturing not only effectively increases fracture dimensions(length,width)butalso substantially enhances fracture network complexity.(3)The CO2pre-injection soaking time significantly influences fracture morphology,with both fracture dimensions and structural complexity showing marked increases as soaking time extends.(4)Increasing formation pore pressure promotes the activation of bedding planes with relatively weaker mechanical strength,leading to significant enhancements in fracture length and complexity,but simultaneously restricts the widening of fracture apertures.The outcomes of this research provide a theoretical foundation for optimizing the design of operational parameters in CO2hybrid fracturing for shale oil reservoirs. 展开更多
关键词 CO2hybrid fracturing Fracture propagation Fracture morphology Parameter optimization
暂未订购 下载PDF
Tensile-shear collaborative fracturing in hard rock induced by a controllable free surface: Mechanism and application 认领 引用
14
作者 Chenliang Hao Longjun Dong +3 位作者 Fangzhen Fan Xuewei Li Ju Ma Yihan Zhang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第4期725-742,共18页
In deep hard rock mining,high confining pressure inhibits tensile failure,leading to low efficiency and severe tool wear in conventional mechanical rock breaking methods.To solve this problem,we propose a Controllable... In deep hard rock mining,high confining pressure inhibits tensile failure,leading to low efficiency and severe tool wear in conventional mechanical rock breaking methods.To solve this problem,we propose a Controllable Free Surface Induced Tensile-Shear Collaborative Fracturing(CFS-TSCF) method.The method pre-forms an engineered controllable free surface(CFS) to reconfigure the local stress field,enabling a specialized device(FIPFD) to apply directional tensile-shear loads for low-energy breaking.A multi-scale approach integrating lab AE tests,DEM simulations,and field verification investigated the fracture mechanism and performance.Results revealed a predominantly tensile-driven(>50%) process.The CFS transforms the rock's triaxial compression into a specific stress path.This path,dominated by directional tension and constrained by lateral compression,guides the fracture along a low-energy channel.This also dictates the micro-mechanism's evolution from central quasi-tensile to peripheral tensile-shear failure.Field trials in hard rock(>200 MPa UCS) validated the method,demonstrating controllable,blocky spalling and achieving an average mining efficiency of 52.03 t/h.This research validates the CFS-TSCF method,offering a new technical paradigm for safe,efficient,continuous hard rock mining. 展开更多
关键词 Hardrock breaking Controllable free surface Fracturing mechanism Stress path Acoustic emission Non-blasting mining
暂未订购 下载PDF
Enhancing fracture uniformity in hydraulic fracturing:A 3D simulation study on natural fracture networks and plugging optimization 认领 引用
15
作者 Xingyi Wang Xin Chang +3 位作者 Chunhe Yang Yintong Guo Haijun Mao Xilin Shi 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5505-5523,共19页
The non-uniform propagation of multi-cluster fractures during the hydraulic fracturing of deep shale gas reservoirs is an ongoing challenge.The dynamic interaction between natural fracture networks and in-situ stress ... The non-uniform propagation of multi-cluster fractures during the hydraulic fracturing of deep shale gas reservoirs is an ongoing challenge.The dynamic interaction between natural fracture networks and in-situ stress fieldsstrongly affects fracture propagation,decreasing fracturing efficiency.In this study,a 3D discrete lattice numerical simulation is employed to systematically analyze the dynamic regulatory mechanisms of multi-cluster fracture propagation under the combined effects of natural fracture characteristics,differential in-situ stress,and temporary plugging strategies.The goal is to optimize temporary plugging parameters for balanced fracture extension.The results reveal that increasing the natural fracture density and size reduces the average hydraulic fracture length while markedly mitigating stress shadowing effects.A greater difference in horizontal in-situ stress intensifiesthe interfracture stress,suppresses natural fracture activation and decreases mechanical interference.Ballsealing temporary plugging effectively limits the excessive growth of dominant outer fractures.As the number of plugging balls increases,the fracture length differentiation coefficientdecreases but then increases,with the optimal plugging timing identifiedat 37.5% of the total fracturing duration.Singlestage plugging achieves a better fracture length differentiation coefficientthan two-stage plugging does.Field applications require multi-stage plugging to increase operational tolerance,which requires proportional increases in the number of plugging balls.The established optimization criteria for temporary plugging parameters provide a theoretical basis for increasing the development efficiencyof deep shale gas reservoirs. 展开更多
关键词 Deep shale Hydraulic fracturing Natural fracture Temporary plugging optimization Discrete lattice model
暂未订购 下载PDF
Investigation of fracture pressure and EOR mechanisms during fracturing flooding in low-permeability sandstone using CT and NMR 认领 引用
16
作者 Lei Zhang Hua-Peng Jing +7 位作者 Li-Yuan Dong Gloire Imani Dong-Yan Fan Shuai-Shi Fu Bilal Shams Memon Yong-Fei Yang Jun Yao Hai Sun 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1371-1386,共16页
Fracturing flooding provides an effective approach to overcoming injection difficulties and enhancing oil recovery in high-water-cut,low-permeability sandstone reservoirs.Injecting fracturing-flooding fluids(FFFs)at h... Fracturing flooding provides an effective approach to overcoming injection difficulties and enhancing oil recovery in high-water-cut,low-permeability sandstone reservoirs.Injecting fracturing-flooding fluids(FFFs)at high rates over short durations enables a coupled process of hydraulic fracturing and flooding,especially when the FFFs contain surfactants.In this study,two types of core experiments were conducted to elucidate the mechanisms of reservoir modification and residual oil mobilization during fracturing flooding.(1)Fracturing flooding combined with CT scanning:The effects of N2permeability(Kg)and FFF viscosity on fracture pressure(Pf)were investigated.Post-flooding CT scans of multiple cores were performed to visualize fracture propagation.(2)Fracturing flooding combined with NMR experiments:The recovery efficiencies of water-based and petroleum sulfonate(NPS)-based fracturing flooding were compared with conventional water flooding.The results showed a negative correlation between Kgand both Pfand the permeability enhancement factor(EK),with EK ranging from 1.61 to 0.43.Increasing FFF viscosity led to higher Pfvalues.The EK first increased and then decreased,consistent with the fracture distribution observed in CT images.Moreover,NPS fracturing flooding exhibited superior enhanced oil recovery(EOR)performance compared with water fracturing flooding.The latter primarily improved recovery in small pores and mesopores,with recovery enhancement factors(ER)of 0.44 and 0.36,respectively.In contrast,the NPS fracturing flooding achieved significant recovery improvements across all pore sizes,with ERvalues in micropores and macropores approximately threefold and fifteenfold higher than those of water fracturing flooding.This study presents a novel investigation into the mechanisms of fracture propagation and enhanced oil recovery in fracturing flooding processes. 展开更多
关键词 High water cut Low permeability sandstone Fracturing flooding CT scanning NMR Reservoir modification EOR
暂未订购 下载PDF
Mechanisms of efficient three-dimensional fracture network construction in deep shale reservoirs via methane multistage explosive fracturing 认领 引用
17
作者 Yabo Chai Ning Luo +6 位作者 Jianan Zhou Yucheng Wei Hu Zhang Chen Lin Guangrui Ma Cheng Zhai Yu Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期2831-2858,共28页
Methane in situ multistage explosive fracturing(MISMEF)presents a promising technique for enhancing complex fracture networks in deep,low-permeability shale reservoirs.This study employed highfidelity3D simulations,in... Methane in situ multistage explosive fracturing(MISMEF)presents a promising technique for enhancing complex fracture networks in deep,low-permeability shale reservoirs.This study employed highfidelity3D simulations,integrating a characteristic methane–oxygen explosion load model with dynamic relaxation and full-restart methods,to elucidate the coupled interactions between explosive loading and in situ stress.A damage-based zoning approach was developed to quantify fracture characteristics,leading to the proposal of a novel dimensionless evaluation index,Fmef.Results showed that in situ stress predominantly suppressed longitudinal fracture growth,while multistage loading effectively enhanced both lateral and longitudinal propagation following a"delayed initiation–accelerated propagation"pattern.Fracture volume exhibited nonlinear amplificationwith increasing stages,and the continuous increase in fractal dimension suggested improved network connectivity.Energy redistribution driven by the coupled effects of in situ stress and staged loading promoted complex network formation near the wellbore,with MISMEF progressively reducing fracture thresholds through rock mass weakening.Fmef analysis confirmedsignificantimprovement in fracture network quality across all stress conditions,particularly under medium to high in situ stress.This work provides critical mechanistic insights and a theoretical foundation for optimizing MISMEF in deep shale reservoir stimulation. 展开更多
关键词 Methane in situ multistage explosive fracturing(mismef) In situ stress Multistage explosion Three-dimensional fracture network Multidimensional evaluation index
暂未订购 下载PDF
Characteristics of microwave-induced borehole fracturing in hard rock with different heating rates and temperatures under true triaxial stress 认领 引用
18
作者 Jiuyu Zhang Feng Lin +4 位作者 Xia-ting Feng Yuntan Ao Shiping Li Tianyang Tong Xiangxin Su 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1768-1780,共13页
Abstract:Microwave-based destressing is regarded as a promising approach for proactively preventing and controlling rockbursts in deep hard rock.As the fracturing degree of microwave-induced boreholes is affected by b... Abstract:Microwave-based destressing is regarded as a promising approach for proactively preventing and controlling rockbursts in deep hard rock.As the fracturing degree of microwave-induced boreholes is affected by borehole diameter,water content,mineral content,etc.,it is difficult to establish relationships between them.The research aims to unify various factors with heating rate and temperature,and establish a microwave parameter design method based thereon.Tests on microwave-induced borehole fracturing in hard rock with different or similar heating rates and temperatures under true triaxial stress were conducted.The test results show that both heating rate and temperature promote radial fracture of the rock,but have little effect on the development of axial fractures.Compared with heating rate,temperature is a more critical factor influencing microwave-induced fracturing.The effects of the heating rate on rock fracturing become noticeable only at higher temperatures.When the heating rate and temperature are similar but the diameter of the boreholes is different,the crack distribution,total length,wave velocity attenuation,and fracture process are similar.It is feasible to reverse-design microwave parameters under different borehole diameters based on the heating rate and temperature.Thermal fracturing of basalt shows a distinct threshold effect between 150℃ and 195℃(with an average of about 175℃),and the heating rate and borehole diameter exert minor influences thereon.The results provide guidance for the design of microwave parameters in practice. 展开更多
关键词 Rockburst Destressing True triaxial stress Microwave-induced fracturing Microwave parameter design
暂未订购 下载PDF
Artificial Intelligence-Driven Subsurface Hydraulic Fracturing Engineering:Connotation and Practices 认领 引用
19
作者 Bin Yuan Mingze Zhao +3 位作者 Wei Zhang Siwei Meng Aoran Jin Birol Dindoruk 《Engineering》 SCIE EI CSCD 2026年第3期144-156,共13页
Motivated by the global energy transition and subsurface energy resource(oil,gas,coal-bed-methane,geothermal,etc.)development,subsurface hydraulic fracturing technology is undergoing a paradigm shift from traditional ... Motivated by the global energy transition and subsurface energy resource(oil,gas,coal-bed-methane,geothermal,etc.)development,subsurface hydraulic fracturing technology is undergoing a paradigm shift from traditional experience-driven approaches to data-or intelligence-driven techniques.This work systematically elaborates on the connotation,recent practices,and future trends of artificial intelligence(AI)-driven subsurface hydraulic fracturing technology.This work proposes a three-step technical evolution framework centered on data-driven→dynamic optimization→autonomous decision-making.Recent key practices in the framework are also introduced,including smart characterization and optimization of hydraulic fracturing,smart forecast of production operation after fracturing,and real-time regulation of entire fracturing-to-production lifecycle.The smart characterization of three-dimensional fracture propagation is achieved by constructing the Dy-Fracture-Net model.A dual-model collaborative architecture is developed to enable real-time warning and smart optimization during the fracturing process.Furthermore,the innovative Dy-Production-Net network is designed to predict the dynamics of postfracturing reservoir parameters and production.Through integrating with intelligent optimization algorithms,a real-time regulation system encompassing the entire fracturing-to-production workflow is formed.To address the bottlenecks such as the lack of downhole monitoring data and insufficient model interpretability,future efforts are recommended as follows:miniaturization of multimodal perception agents,self-interpretability of mechanism-data fusion modeling,and autonomous closed-loop control.The findings of this work provide theoretical support and practical pathways for realizing the future AI-driven subsurface fracturing technology,holding significant strategic importance for advancing the digital transformation of the oil and gas industry. 展开更多
关键词 Hydraulic fracturing Artificial intelligence Data-driven optimization Autonomous decision-making Digital transformation
暂未订购 下载PDF
Aqueous two-phase high-viscosity friction reducer for deep reservoir fracturing and its mechanisms of temperature resistance and viscosity enhancement 认领 引用
20
作者 YOU Qing DING Xingxing +4 位作者 LI Hanzhou HUANG Xiaokai JIN Zhirong DAI Caili TAO Jiaping 《Petroleum Exploration and Development》 SCIE 2026年第3期875-886,共12页
Given the stringent requirements for friction reducers in terms of long-distance friction reduction,efficient proppant transport,temperature resistance and viscosity enhancement in deep oil and gas reservoir fracturin... Given the stringent requirements for friction reducers in terms of long-distance friction reduction,efficient proppant transport,temperature resistance and viscosity enhancement in deep oil and gas reservoir fracturing development,an aqueous two-phase high-viscosity friction reducer ANsD-PADA suitable for deep reservoir fracturing was prepared by introducing nanomaterial ANsD and through the aqueous two-phase polymerization.Its mechanisms of temperature resistance,viscosity enhancement,and friction reduction were explored by means of fluorescence spectroscopy,microscopic morphology observation,nanomechanical testing and other analytical methods,and field tests were also carried out.The introduction of hydrophobic monomer N-(3-dimethylaminopropyl)methacrylamide enables PADA(a self-synthesized hydrophobic terpolymer)molecules to entangle,associate and self-assemble into a honeycomb-like network structure under the combined effects of van der Waals forces,electrostatic repulsion and hydrophobic interaction.This structure further increases the hydrodynamic volume,thereby significantly improving the viscosity-enhancing performance of the product.ANsD fills the pores of the polymer network structure,effectively strengthening the network skeleton and association junctions,and remarkably improving the temperature resistance of the system.The friction reducer retains a friction reduction rate of 73.36%at 130°C,with a temperature resistance up to 150°C,and it has demonstrated encouraging results in the pilot site at Well XX-HF targeting deep shale oil reservoirs on the northern slope zone of the Gaoyou Sag,Subei Basin,China. 展开更多
关键词 deep oil and gas fracturing nanomaterial aqueous two-phase high-viscosity friction reducer temperature resistance viscosity enhancement nanomechanics
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈