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Advancing drilling parameter reliability:A data-driven comparison of MWD and DPM for stratigraphic identification 认领 引用
1
作者 Ping-Feng Li Xue-Fan Wang +4 位作者 Zhou Yang Zhong-Jian Zhang Fei Yang Hong-Pei Tang Bing-Bing Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期4094-4107,共14页
Stratigraphic interface characterization and strength parameter assessment of geomaterials constitute fundamental research priorities in geological and geotechnical engineering.While measurement while drilling(MWD)and... Stratigraphic interface characterization and strength parameter assessment of geomaterials constitute fundamental research priorities in geological and geotechnical engineering.While measurement while drilling(MWD)and drilling process monitoring(DPM)have emerged as critical techniques for acquiring real-time drilling parameters,inherent limitations in data interpretation persist.The critical challenge of random fluctuations in MWD-derived penetration rate measurements exhibits poor correlation with the stratified homogeneity characteristics of geological formations.Such discrepancies undermine the reliability of stratigraphic classification and mechanical property analysis.Through systematic comparison of MWD and DPM datasets combined with quantitative parameter evaluation,this investigation reveals significant methodological distinctions in data acquisition accuracy.Machine learning-enhanced analysis employing Support Vector Machine(SVM)algorithms demonstrates that DPM-derived parameters provide superior stratigraphic identification capabilities.Our findings indicate that DPM implementations achieve 20.57%and 38.01%higher resolution in interface detection along two drillholes compared to the conventional MWD approaches.This improvement allows for better prediction of stratigraphic profiles and more precise guidance in subsequent geological and geotechnical engineering practices. 展开更多
关键词 Measurement while drilling Drilling process monitoring Ground investigation Drilling speed
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Energy relief effect of real-time drilling to prevent rockburst in high-stress rock 认领 引用 被引量：1
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作者 Zhichao He Fengqiang Gong +2 位作者 Li Ren Weimin Yang Xuezhen Wu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1460-1475,共16页
To investigate the energy relief effect of real-time drilling in preventing rockburst in high-stress rock,a series of high-stress real-time drilling uniaxial compression tests were conducted on red sandstone specimens... To investigate the energy relief effect of real-time drilling in preventing rockburst in high-stress rock,a series of high-stress real-time drilling uniaxial compression tests were conducted on red sandstone specimens using the SG4500 drilling rig.Results showed that the mechanical behavior(i.e.peak strength and rockburst intensity)of the rock was weakened under high-stress real-time drilling and exhibited a downward trend as the drilling diameter increased.The real-time drilling energy dissipation index(ERD)was proposed to characterize the energy relief during high-stress real-time drilling.The ERD exhibited a linear increase with the real-time drilling diameter.Furthermore,the elastic strain energy of post-drilling rock showed a linear relationship with the square of stress across different stress levels,which also applied to the peak elastic strain energy and the square of peak stress.This findingreveals the intrinsic link between the weakening effect of peak elastic strain energy and peak strength due to high-stress real-time drilling,confirmingthe consistency between energy relief and pressure relief effects.By establishing relationships among rockburst proneness,peak elastic strain energy,and peak strength,it was demonstrated that high-stress real-time drilling reduces rockburst proneness through energy dissipation.Specifically,both peak elastic strain energy and rockburst proneness decreased with larger drill bit diameters,consistent with reductions in peak strength,rockburst intensity,and fractal dimensions of high-stress real-time drilled rock.These results validate the energy relief mechanism of real-time drilling in mitigating rockburst risks. 展开更多
关键词 Rock mechanics Rockburst Real-time drilling Drilling energy relief Energy storage capacity Rockburst proneness
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Development of an intelligent drilling cuttings method drill rig for addressing suction and sticking phenomena:Field experiment 认领 引用
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作者 Lei Cui Yishan Pan +4 位作者 Jianzuo Zhang Aiwen Wang Lianpeng Dai Cancan Liu Shengliang Lu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第6期1189-1202,共14页
During the operation of the drilling cuttings method,frequent occurrences of suction and sticking phenomena lead to the loss of drilling tools and failure to achieve the designed borehole depth.resulting in inaccurate... During the operation of the drilling cuttings method,frequent occurrences of suction and sticking phenomena lead to the loss of drilling tools and failure to achieve the designed borehole depth.resulting in inaccurate risk assessment for coal seam rockbursts.To address these challenges,a mechanical analysis of cuttings transport via the spiral drill pipe was conducted.This analysis identified the primary factors contributing to suction and sticking phenomena in spiral drill pipes and proposed a targeted approach for mitigating these issues.Based on this analysis,an intelligent drilling cuttings method drill rig(IDCMDR)was developed,and field experiments were conducted.The experimental results demonstrate that when suction occurs,adjusting the rotational and drilling speeds of the IDCMDR effectively controls the phenomenon.When sticking occurs,the stuck drill pipe can be addressed by injecting high-pressure gas into the borehole bottom through the hollow structure of the spiral drill pipe or by reversing its rotation.During operation,characteristic patterns in the needle movements of the thrust and torque hydraulic gauges on the IDCMDR enable the identification of suction and sticking phenomena.The development and field validation of the IDCMDR confirm the feasibility of the theoretically proposed mitigation methods. 展开更多
关键词 Rockburst Drilling cuttings method Intelligent drilling cuttings method drill rig (IDCMDR) Spiral drill pipe Suction and sticking phenomena
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The testing method of rock elastic modulus while drilling based on rotational ratio energy analysis 认领 引用
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作者 WANG Qi CAI Song-lin +2 位作者 GAO Hong-ke JIANG Bei PANG Bo 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第5期2326-2343,共18页
The elastic modulus of rock mass is a fundamental parameter for the surrounding rock stability analysis and the support scheme design.The traditional testing methods are mainly conducted through indoor experiments,whi... The elastic modulus of rock mass is a fundamental parameter for the surrounding rock stability analysis and the support scheme design.The traditional testing methods are mainly conducted through indoor experiments,which require further research for in-situ testing of rock mass elastic modulus.This article conducts multi-type rock mass digital drilling experiments based on the intelligent rotary cutting testing system for rock masses.The response law of drilling parameters to elastic modulus has been clarified.And a rock rotational ratio energy that integrates four types of drilling parameters is proposed.The rock elastic modulus prediction models(RD-Ei models)are established.The experimental results show that the average testing errors of the model based on drilling pressure,drilling torque,and rotational ratio energy are 21.04%,18.84%,and 6.44%,respectively.On this basis,the intelligent drilling explore system of geology is used to carry out rock drilling experiments.The identification of rock interfaces and testing of elastic modulus can be achieved.This study lays a theoretical foundation for real-time quantitative measurement of the surrounding rock elastic modulus on site. 展开更多
关键词 elastic modulus of rock mass digital drilling cutting analysis drilling parameters in-situ testing
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Effect of confining pressures on the drilling parameters and specific energy:Insights into determining in situ stress using drilling monitoring techniques 认领 引用 被引量：1
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作者 Wendal Victor Yue Manchao He +3 位作者 Hehua Zhu Zhongwen Yue Sichen Long Mengjia Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3471-3482,共12页
Current in-situ stress determination methods are typically conducted inside a drillhole after its creation.However,the drilling process itself is not utilized for measuring in-situ stress or rock strength,despite bein... Current in-situ stress determination methods are typically conducted inside a drillhole after its creation.However,the drilling process itself is not utilized for measuring in-situ stress or rock strength,despite being a form of direct mechanical testing on the rock mass.Crucially,drilling contains valuable information about in-situ stress and rock strength,as rocks under high compressive stresses exhibit greater strength.This paper presents a novel in-situ stress determination method,supported by the experimental result of rock drilling monitoring tests using a mine hydraulic-rotary drilling machine.Key drilling parameters—including thrust force,rotation speed,torque and drilling speed—are monitored in real time to determine the drilling specific energy per unit volume of rock.A concave-upward relationship between drilling specific energy and rotation speed is identified,which can characterize rock compressive strength and tensile strength with consistent regularity.Further drilling tests are conducted on the same rock samples under varying confining pressures.Results indicate that as confining pressure increases,the concave-upward curve of drilling specific energy shifts upward,reflecting enhanced rock strengths due to confinement.The paper outlines the complete methodology for in-situ stress determination using drilling monitoring techniques,bridging the research gaps among drilling monitoring,rock mechanics,and in-situ stress analysis. 展开更多
关键词 Drilling monitoring test Drilling specific energy In-situ stress determination Confining stresses
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Fluid invasion-induced geological risks during drilling in marine natural gas hydrate reservoirs:A mini review 认领 引用 被引量：1
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作者 Lin Dong Yan-long Li Neng-you Wu 《China Geology》 CAS CSCD 2026年第3期652-658,共7页
Geological risks are the main obstacles encountered during drilling in marine natural gas hydrate reservoirs.This review aims to provide a primary insight into the geological risks in the process of drilling in marine... Geological risks are the main obstacles encountered during drilling in marine natural gas hydrate reservoirs.This review aims to provide a primary insight into the geological risks in the process of drilling in marine hydrate reservoirs.Different geological risks and their characteristics will be analyzed,together with a discussion of possible influencing factors.Geological risks occurring in the marine natural gas drilling process have a close association with uncontrollable drilling fluid invasion and hydrate dissociation.Finally,the mechanisms of drilling risks and control strategies for safe drilling are highlighted.Results can give a reference to drilling risk prediction and control for drilling in marine natural gas hydrate reservoirs efficiently. 展开更多
关键词 Natural gas hydrate Geological risk Drilling fluid invasion Hydrate dissociation Risk control Invasion mechanism Influencing factor Drilling process
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A dual attention-based deep learning model for lithology identificationwhile drilling 认领 引用 被引量：3
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作者 Jie Chen Zhen Gui +6 位作者 Yichao Rui Xusheng Zhao Xiaokang Pan Qingfeng Wang Yuanyuan Pu Zheng Li Maoyi Liu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1177-1192,共16页
Lithology identificationwhile drilling technology can obtain rock information in real-time.However,traditional lithology identificationmodels often face limitations in feature extraction and adaptability to complex ge... Lithology identificationwhile drilling technology can obtain rock information in real-time.However,traditional lithology identificationmodels often face limitations in feature extraction and adaptability to complex geological conditions,limiting their accuracy in challenging environments.To address these challenges,a deep learning model for lithology identificationwhile drilling is proposed.The proposed model introduces a dual attention mechanism in the long short-term memory(LSTM)network,effectively enhancing the ability to capture spatial and channel dimension information.Subsequently,the crayfishoptimization algorithm(COA)is applied to optimize the model network structure,thereby enhancing its lithology identificationcapability.Laboratory test results demonstrate that the proposed model achieves 97.15%accuracy on the testing set,significantlyoutperforming the traditional support vector machine(SVM)method(81.77%).Field tests under actual drilling conditions demonstrate an average accuracy of 91.96%for the proposed model,representing a 14.31%improvement over the LSTM model alone.The proposed model demonstrates robust adaptability and generalization ability across diverse operational scenarios.This research offers reliable technical support for lithology identification while drilling. 展开更多
关键词 Lithology identificationwhile drilling Deep learning Dual attention mechanism Metaheuristic algorithm Field applications
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Drilling parameter acquisition and rock strength determination on rotary-percussive drilling for drill-and-blast excavation 认领 引用
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作者 Wendal Victor Yue Manchao He +3 位作者 Hehua Zhu Zhongwen Yue Sichen Long Mengjia Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4278-4298,共21页
Drill-and-blast excavation design requires a comprehensive understanding of the strength properties of the surrounding rock mass in the blast area.However,due to the absence of reliable methods for determining rock st... Drill-and-blast excavation design requires a comprehensive understanding of the strength properties of the surrounding rock mass in the blast area.However,due to the absence of reliable methods for determining rock strength in situ,blast designs commonly rely on laboratory test results derived from limited core samples.To address this limitation,this study proposes a novel method for estimating in situ rock compressive and tensile strengths using drilling monitoring data.Drilling monitoring is a technique that interprets the properties of the drilled medium through recorded drilling parameters.A rotary-percussive drilling test system was developed for this purpose,incorporating an actual rotary-percussive drill from a blasthole drill rig along with integrated monitoring systems.Importantly,a complete procedure for acquiring five key drilling parameters,including thrust force,rotation speed,torque,drilling rate,and percussive pressure are described.These parameters were used to calculate the drilling work done,defined as the energy required to excavate a unit volume of rock.The results indicate a nonlinear correlation between drilling work done and percussive pressure,which corresponds to the compressive and tensile strengths of the tested rocks.Furthermore,applying confining stress to rock samples was found to increase the drilling work done,reflecting a higher energy demand for drilling under confined conditions.This observation is consistent with rock mechanics principles,wherein rock strength increases under confining pressure.Thus,this study demonstrates that drilling monitoring tests can effectively indicate rock strength under in situ stress conditions.The findings offer practical implications for real-time in situ rock strength assessment,thereby bridging the gap between drilling monitoring research and rock mechanics applications. 展开更多
关键词 Drilling monitoring study Rotary-percussive drilling Drill-and-blast Geotechnical in situ testing method In situ rock strength
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Preparation and performance evaluation of phase change material microcapsules for smart regulation of drilling fluid temperature for marine gas hydrate reservoirs 认领 引用
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作者 Xin Zhao Xiao-Long Zhang +4 位作者 Wen-Tuo Li Yu-Jie Kang Qi Geng Zheng-Song Qiu Zhi-Yuan Wang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第6期3374-3383,共10页
In the drilling process of hydrates,hydrate decomposition and regeneration can cause wellbore collapse and plugging.Herein,phase change materials(PCMs)were introduced into the drilling fluids to regulate their tempera... In the drilling process of hydrates,hydrate decomposition and regeneration can cause wellbore collapse and plugging.Herein,phase change materials(PCMs)were introduced into the drilling fluids to regulate their temperature for controlling hydrate decomposition.The binary composite PCM and polymethyl methacrylate(PMMA)were used to prepare PCM microcapsules(PCMMs)by suspension polymerization.Basic characte ristics of PCMM we re studied,and its temperatu re-regulating effect,inhibitory perfo rmance on hydrate decomposition and regeneration,strength,and compatibility with drilling fluids were systematically investigated.The phase change temperature of the binary composite PCM could be regulated from 16 to 20℃through the optimization of the ratio of dodecanol and fatty alcohol.When the ratio of dodeca nol was 90%,the phase change temperatu re of PCMMs was 18℃with the enthalpy of 93.9 J·g-1.In the heating process from 16 to 22℃,5%and 8%PCMM could smartly cool down the suspension through phase change energy storage to prolong the temperature rise time by 40%and 74%,respectively.Under the condition that the fluid temperature is from 2℃around the seafloor to 25℃at the bottom of the well in a simulation drilling process,in the heating period,8%PCMM demonstrated superior efficacy compared to lecithin in prolonging the hydrate decomposition time by its cold release effect.In addition,the decrease in drilling fluid temperature was also hindered by the cold storage effect during the cooling stage,and the hydrate regeneration time was prolonged by 52.1%.Therefore,PCMM can reduce the risk of wellbore instability and plugging caused by hydrate decomposition and regeneration.Meanwhile,PCMMs exhibited good shearing strength and sealing property under alkaline conditions of drilling fluids and showed relatively minor impacts on the basic drilling fluid properties with a concentration of no mo re than8%.This study offers a new method to maintain the safety of the hydrate drilling wellbore. 展开更多
关键词 Hydrate decomposition Hydrate regeneration Microcapsule Drilling fluid Binary composite PCM Cold storage
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Numerical and physical simulations of acoustic imaging for adjacent well detection while drilling 认领 引用
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作者 Teng Zhao Gen-Sheng Li +3 位作者 Xiao-Hua Che Wen-Xiao Qiao Jun-Qiang Lu Bai-Yong Men 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1197-1219,共23页
With increase in the number of operations involving relief wells,radial wells,U-shaped wells,and other complex well structures,challenges such as collision prevention,obstacle bypassing,and adjacent-well connectivity ... With increase in the number of operations involving relief wells,radial wells,U-shaped wells,and other complex well structures,challenges such as collision prevention,obstacle bypassing,and adjacent-well connectivity achievement during drilling have become inevitable.These challenges necessitate a technology that can accurately detect adjacent wells in real time during drilling operations.As current borehole acoustic reflection imaging technology heavily relies on cable-based logging,it cannot perform real-time detection of adjacent wells during drilling,thereby limiting the drilling efficiency.This study proposes a new adjacent-well-acoustic-detection-while-drilling method that integrates wireline borehole acoustic reflection imaging with drilling technology,along with an adjacent-well imaging method based on compressed sensing(CS).Together,these methods enable high-resolution,real-time detection of the adjacent target wells during drilling,ensuring safe and efficient underground drilling operations.The finite-difference method was used to simulate three-dimensional numerical models under drilling conditions for two scenarios—with and without target wells adjacent to the drilling well.Experimental validation was conducted in a water tank using an adjacent-well-acoustic-detection-while-drilling tool.The simulated target well was imaged using the CS method,and the imaging results were compared with those obtained from numerical and physical simulations,thereby validating the feasibility of the proposed acoustic detection and imaging methods.The results demonstrate that as the radial distance from the target well increases,the PP echo exhibits delayed arrival times and approaches a plane wave while exhibiting amplitude attenuation.Conversely,a linear increase in the target well diameter advances the PP echo arrival time and enhances its amplitude proportionally.When the target and drilling wells are approximately parallel with a small intersection angle,PP echoes yield better detection results than SS echoes;when the wells are coplanar with a large intersection angle,SS echoes provide better detection results.The receiver element aligned with the target well's azimuth detects all echo modes with the earliest arrival times and highest amplitudes.The adjacent-well imaging method based on CS offers very high spatial resolution,with target wells appearing as local amplitude maxima.This feature enables the precise determination of their azimuth and inclination relative to the drilling wells.The findings offer a solid physical and methodological foundation for real-time detection of adjacent wells during drilling operations and demonstrate enormous theoretical and engineering application potential. 展开更多
关键词 Adjacent well detection Acoustic logging while drilling Compressed sensing Numerical simulation Physical simulation
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Optimization of long-hole raise blasting considering drilling deviations:Theoretical and numerical approaches 认领 引用
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作者 Xianyang Qiu Wenbo Shen +4 位作者 Rihong Cao Xiuzhi Shi Yongsheng Xie Wei Liu Zhigang Tian 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5380-5395,共16页
Long-hole raise blasting(LHRB)is a highly efficientexcavation method that is used extensively in underground mining and civil engineering.However,deviations in drilling are usually not accounted for in LHRB,which may ... Long-hole raise blasting(LHRB)is a highly efficientexcavation method that is used extensively in underground mining and civil engineering.However,deviations in drilling are usually not accounted for in LHRB,which may adversely affect the efficiencyand progress of raise excavation.In this paper,the effect of drilling deviation on the optimization of LHRB is investigated.The actual trajectories of the blastholes were measured,and the deviation rates between different diameters were compared.The effects of the drilling deviation on the burn-cut blasting mode(BCBM)and spherical cartridge blasting mode(SCBM)of LHRB were theoretically analyzed.Numerical models with vertical holes that consider the actual hole location at different positions of the raise were subsequently developed to simulate the raise blasting damage.The results indicated that the BCBM relied substantially on the drilling accuracy to provide free surface and compensation space for further blasting,whereas the requirements of drilling deviation for the SCBM were less strict.With increasing hole deviation in the BCBM,the height of the failure area of the raise blasting increased.Optimization designs that combine the BCBM and SCBM were proposed to strike a balance between the efficiencyand reliability of LHRB.A 40 m high slot raise in a large-diameter long-hole(LDL)stope was successfully formed by multimode LHRB.The fieldtest results reveal that the optimization of LHRB is feasible in practical engineering. 展开更多
关键词 Long-hole raise blasting(LHRB) Drilling deviation Blasting optimization Numerical simulation Field test
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New technology for controlling large deformation in soft rock mining roadways based on deep and shallow dense drilling and its engineering application 认领 引用
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作者 SUN Xiaoming LI Zhihu +2 位作者 ZHANG Yong SHI Fukun MIAO Chengyu 《Journal of Mountain Science》 SCIE CSCD 2026年第6期2948-2965,共18页
This study investigates the control of large deformation in extraction roadways,a critical issue for safe coal mining.While conventional dense drilling offers moderate effectiveness,it provides limited capability for ... This study investigates the control of large deformation in extraction roadways,a critical issue for safe coal mining.While conventional dense drilling offers moderate effectiveness,it provides limited capability for targeted treatment of roof strata at varying depths.To overcome this limitation,an innovative pressure relief technique employing both shallow and deep dense drilling is proposed and applied to the mining roadway of the New Shanghai No.1 Coal Mine,China.Through a synergistic pressure relief mechanism,the method effectively reduces the magnitude and propagation range of front abutment stress ahead of the mining face.Key design parameters—including borehole length,spacing,and angle—were optimized through an integrated approach combining theoretical calculations,numerical simulations,and field validation.Field measurements demonstrate that after implementing this technique,the average stable axial force in roof anchor cables decreased from 173.3 kN to 141.0 kN,representing a reduction of 18.6%.The average support resistance of hydraulic supports#210 and#212 dropped from 34.82 MPa and 29.15 MPa to 22.16 MPa and 14.88 MPa,respectively,corresponding to reductions exceeding 35%.Total cumulative convergence was reduced by more than 40%.These findings confirm the substantial deformation control performance of the proposed method,offering a practical reference for managing large deformations in tunnels under similar geological conditions. 展开更多
关键词 Mining roadway Deep and shallow dense drilling Pressure relief mechanism Large deformation control Engineering application
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Structural-state integrated modeling of multi-mechanism formation damage during drilling-completion 认领 引用
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作者 Ke-Ming Sheng Guan-Cheng Jiang +2 位作者 Ming-Liang Du Lan Qiao Yin-Bo He 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期1929-1954,共26页
To address the modeling fragmentation and predictive deviation caused by the conventional"singlemechanism,weakly coupled,additive response"approach in formation damage research,this study proposes an integra... To address the modeling fragmentation and predictive deviation caused by the conventional"singlemechanism,weakly coupled,additive response"approach in formation damage research,this study proposes an integrated modeling framework for multi-mechanism coupling throughout the entire drilling and completion process.Five dominant damage mechanisms are unified into a multi-physics formulation featuring a dual solid–liquid module architecture and a shared-state coupling mechanism.A structural-state integrated damage function(SSIDF)is introduced to establish a continuous mapping from microscopic mechanism evolution to macroscopic permeability degradation.A feedback network encompassing scaling,clay swelling,and water blocking is further developed,achieving bidirectional dynamic coupling among reaction kinetics,interfacial transport,and saturation fields,and representing one of the most systematic coupling schemes currently known.The model is solved via a space-time multi-scale optimization strategy,ensuring strong numerical stability and scalability.Field validation demonstrates a prediction accuracy of 98.6%,representing an improvement of over 8%compared to traditional additive models.The model is particularly applicable to unconventional reservoirs such as deepwater formations,where multi-mechanism damage evolves rapidly and conventional additive models fail to capture dynamic coupling behavior. 展开更多
关键词 Drilling and completion integration Unified modeling Multi-mechanism coupling Structural-state integrated damage function(SSIDF) Feedback network Structural disturbance function
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Mechanism and application of a new method for roof cutting and pressure relief with dense drilling 认领 引用
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作者 FU Qiang YANG Jun +5 位作者 GAO Yu-bing LI Chang-jiang LIU Yu-xuan JIANG Han-ze ZHOU Jian-lin WU Xing 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第2期802-820,共19页
With the continual deterioration of mining conditions,the deformation and failure of surrounding rock in roadways with weak roofs under intense mine pressure during close-distance coal seam extraction has become a cri... With the continual deterioration of mining conditions,the deformation and failure of surrounding rock in roadways with weak roofs under intense mine pressure during close-distance coal seam extraction has become a critical issue restricting the safe and efficient mining of coal.To address the issue of increased surrounding rock damage caused by blasting pressure relief in such roadways,this study proposes an innovative non-explosive method for roof cutting and pressure relief with dense drilling(RCPRDD)to protect the roadway.A combined approach of laboratory experiments,theoretical analysis,numerical simulation,and field testing was employed to clarify the rock weakening effects and mechanisms induced by dense drilling.An optimal design method for drilling diameter and spacing was established,and the effectiveness of this method was validated.The research results indicate that the degree of rock weakening induced by dense drilling is primarily related to the drilling density coefficient.As the drilling density coefficient increases,the rock weakening effect becomes more pronounced.At the same time,dense drilling exerts a significant amplifying effect on the tensile stress experienced by the side roof of the roadway goaf.A functional relationship between the dense drilling weakening coefficient and the drilling density coefficient was established,providing a theoretical basis for the selection of key parameters for dense drilling.The method was ultimately implemented in a field engineering test,effectively reducing the stress in the coal body of the advanced roadway,controlling the deformation and failure of the surrounding rock,and achieving the goal of protecting the roadway.This demonstrated the feasibility and effectiveness of the RCPRDD.The research findings provide a scientific basis for controlling roadway deformation under similar conditions. 展开更多
关键词 surrounding rock control weak roof non-explosive dense drilling roof cutting and pressure relief
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Rock Magnetic Characterization of the Seismogenic Environment of the Large Earthquake within Wenchuan Earthquake Fault Scientific Drilling Borehole 2 Cores 认领 引用
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作者 ZHANG Lei LI Haibing +6 位作者 SUN Zhiming CAO Yong XU Peng LI Chunrui WANG Huan ZHENG Yong SI Jialiang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2026年第1期251-264,共14页
The Yingxiu-Beichuan fault zone(YBFZ)has long been active and experienced repeated large earthquakes.The physicochemical properties of the deep fault zone(>1000 m)are the key to understanding the deformation mechan... The Yingxiu-Beichuan fault zone(YBFZ)has long been active and experienced repeated large earthquakes.The physicochemical properties of the deep fault zone(>1000 m)are the key to understanding the deformation mechanism of large earthquakes.This study uses rock magnetic,microstructural,and geochemical analyses of representative samples exposed in FZ1681 within the Wenchuan Earthquake Fault Scientific Drilling borehole 2(WFSD-2)cores.Fault gouge and fault breccia have higher magnetic susceptibility values than wall rocks,and they contain abundant paramagnetic minerals and small quantities of magnetite and monoclinic pyrrhotite.The magnetite and monoclinic pyrrhotite in the fault gouge were mainly formed by coseismic frictional heating,indicating that large earthquakes with frictional heating temperatures of~500-900℃once occurred in the YBFZ.The seismogenic and coseismic environment was reducing with a relatively high sulfur content.The monoclinic pyrrhotite in the fault breccia was formed mainly by low-temperature hydrothermal fluid.This indicates that the fault zone experienced reducing and low-temperature(<400℃)hydrothermal fluid with a relatively high sulfur content after the earthquake.The YBFZ,which experiences frequent large earthquakes,is weakly oxidizing environment at different depths,but the effect of the low-temperature hydrothermal fluid is weaker at depth. 展开更多
关键词 fault gouge rock magnetism large earthquake Wenchuan Earthquake Fault Scientific Drilling Longmen Shan Thrust Belt
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Cementing and film-forming hydrophobic drilling fluid technology for long horizontal wells in deep coal-rock gas reservoirs 认领 引用
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作者 SUN Jinsheng LIU Hongtao +8 位作者 HAN Jinliang ZHAO Li HAO Pengcheng ZHANG Shangkun PENG Chao LONG Yifu LIU Fan HUANG Xianbin JIN Jiafeng 《Petroleum Exploration and Development》 SCIE 2026年第3期864-874,共11页
Through a systematic analysis of the physical properties of coal and gangue,including microscopic pore structure,surface wettability and mechanical strength,the mechanism of borehole wall collapse in deep coal formati... Through a systematic analysis of the physical properties of coal and gangue,including microscopic pore structure,surface wettability and mechanical strength,the mechanism of borehole wall collapse in deep coal formations was revealed.Based on this understanding,a wellbore-stabilizing drilling fluid concept was proposed,featuring high-efficiency plugging of medium and large pores and fractures+cementation and film-formation in micro and small pores and fractures+overall surface hydrophobic inhibition.An adaptive plugging agent and a cementing film-forming hydrophobic inhibitor were developed,and a cementing,wall-strengthening,film-forming,and hydrophobic drilling fluid system was established.The adaptive plugging agent consists of organic-inorganic hybrid polymer microspheres,which enables self-adaptive plugging of pores and micro-fractures in coal rock through flexible deformation,effectively preventing direct contact between the drilling fluid and medium-to-large pore-fracture systems in the formation.The cementing film-forming hydrophobic inhibitor contains strong adsorption groups and hydrophobic groups,which provides both cementing reinforcement and dense film-forming functions,significantly enhancing the overall structural strength of coal rock,greatly reducing surface hydrophilicity,and inhibiting hydration swelling of clay minerals.The developed drilling fluid system exhibits favorable rheological behavior,filtration-control performance and lubricity.It can substantially improve the compressive strength of rock samples and markedly reduce their linear expansion rate.Field application results demonstrate that the system delivers excellent anti-collapse,cuttings-carrying and lubrication performance,with outstanding wellbore stabilization effectiveness. 展开更多
关键词 deep coal-rock gas water-based drilling fluid borehole-wall collapsing adaptive plugging cementation and film-formation hydrophobic inhibition wellbore stability
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A Formation Inversion Algorithm Based on Collaborative Fuzzy Gradient Neural Dynamics for Natural Gamma Logging While Drilling 认领 引用
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作者 Juntao Liu Ruoxiao Liu +2 位作者 Wenxin Li Zhenming Su Long Jin 《CAAI Transactions on Intelligence Technology》 SCIE EI CSCD 2026年第2期498-513,共16页
A formation inversion algorithm with real-time performance and accuracy is crucial for natural gamma logging while drilling(LWD).However,traditional inversion algorithms are often limited by high computational resourc... A formation inversion algorithm with real-time performance and accuracy is crucial for natural gamma logging while drilling(LWD).However,traditional inversion algorithms are often limited by high computational resource consumption and insufficient accuracy.To address these issues,an improved forward method for natural gamma LWD is proposed.The inverse problem is subsequently modelled using the proposed forward method through which the search methodology and region of formation information are determined.On this basis,a collaborative fuzzy gradient neural dynamics(CFGND)algorithm is proposed,which combines the advantages of the collaborative mechanism in swarm intelligence algorithms and fuzzy gradient neural dynamics(FGND)to improve its accuracy and real-time performance.Specifically,the collaborative mechanism is applied to conduct a global search using all possible formation information.Concurrently,the FGND algorithm initiates a local search from each particle and dynamically and intelligently adjusts the learning rate of the neural dynamics through a fuzzy logic system during the process to achieve rapid and stable local convergence.The CFGND algorithm subsequently updates its globally optimal solution using the optimal solution obtained from the FGND algorithm.This iterative process continues until the termination condition is met.Theoretical analysis proves the existence of an optimal solution for the inverse problem and the convergence of the CFGND algorithm.The results of simulations and experiments demonstrate that the proposed formation inversion algorithm features high accuracy and sufficient real-time performance. 展开更多
关键词 collaborative mechanism fuzzy logic system logging while drilling(LWD) neural dynamics
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Multi-energy field coupling analysis and experimental validation of picosecond laser drilling assisted by ultrasonic shock-induced water flow 认领 引用
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作者 Pengfei Ouyang Yang Liu +7 位作者 Zhaoyang Zhang Xiaolei Chen Yufeng Wang Hao Zhu Kun Xu Jingtao Wang Xiankai Meng Shu Huang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第1期130-154,共25页
The latest generation of aero engines has set higher standards for thrust-to-weight ratio and energy conversion efficiency,making it imperative to address the challenge of efficiently and accurately machining film coo... The latest generation of aero engines has set higher standards for thrust-to-weight ratio and energy conversion efficiency,making it imperative to address the challenge of efficiently and accurately machining film cooling holes.It has been demonstrated that conventional long-pulse lasers are incapable of meeting the elevated quality surface finish requirements for these holes,a consequence of the severe thermal defects.The employment of backside water-assisted laser drilling technology confers a number of distinct advantages in terms of mitigating laser thermal damage,thus representing a highly promising solution to this challenge.However,significant accumulation of bubbles and machining products during the backside water-assisted laser drilling process has been demonstrated to have a detrimental effect on laser transmission and machining stability,thereby reducing machining quality.In order to surmount these challenges,a novel method has been proposed,namely an ultrasonic shock water flow-assisted picosecond laser drilling technique.Numerical models for ultrasonic acoustic streaming and particle tracking for machining product transport have been established to investigate the mechanism.The simulation results demonstrated that the majority of the machining products could rapidly move away from the machining area because of the action of acoustic streaming,thereby avoiding the accumulation of bubbles and products.Subsequent analysis,comparing the process performance in micro-hole machining,confirmed that the ultrasonic field could effectively eliminate bubble and chip accumulation,thus significantly improving micro-hole quality.Furthermore,the impact of ultrasonic and laser parameters on micro-hole quality under varying machining methods was thoroughly investigated.The findings demonstrated that the novel methodology outlined in this study yielded superior-quality micro-holes at elevated ultrasonic and laser power levels,in conjunction with reduced laser frequency and scanning velocity.The taper of the micro-holes produced by the new method was reduced by more than 25%compared with the other conventional methods. 展开更多
关键词 Ultrasonic vibration Water assisted laser drilling Multi-energy field composite Precision manufacturing
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Application of acrylic-based wellbore strengthening material in water-based drilling fluid to stabilize the fractured formation 认领 引用
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作者 Kai-He Lv Juan He +1 位作者 Xian-Bin Huang Jin-Sheng Sun 《Petroleum Science》 SCIE EI CAS CSCD 2026年第2期730-741,共12页
Wellbore instability is the main challenge encountered during borehole construction,particularly when employing water-based drilling fluid(WBDF)under complex geological conditions.A novel wellbore strengthening materi... Wellbore instability is the main challenge encountered during borehole construction,particularly when employing water-based drilling fluid(WBDF)under complex geological conditions.A novel wellbore strengthening material of acrylic resin enhanced by hydrophobically modified calcium carbonate particles(ARH)is synthesized by emulsion polymerization.Transmission electron microscope and particle size analysis reveal that ARH exhibits a spherical structure with a Z-average diameter of 277.6 nm.The lap shear strength test shows ARH effectively adheres to two rock slices with a stress of 0.4838 MPa.Uniaxial compressive strength experiments of simulated rock co res verify that ARH can greatly enhance the compressive strength of the simulated core column to 7.1567 MPa.The incorporation of ARH significantly enhances the compressive strength of shale cores,with increases of 18.0620 and18.9147 MPa compared to those immersed in water and base fluid,respectively.Further microporous membrane plugging experiments show that the filtration losses of 2%ARH in 4%base fluid through 0.1,0.2,and 0.45μm microporous membranes are 13.5,13.2,and 27 mL,respectively,demonstrating excellent plugging capabilities for enhancing wellbore stability.This work generates important theoretical foundations and practical recommendations for wellbore strengthening applications utilizing ARH in complex drilling environments. 展开更多
关键词 Wellbore strengthening material Water-based drilling fluid Acrylic resin Acrylic resin enhanced by hydrophobically modified calcium carbonate
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Data-driven estimation of surrounding rock areal fracture intensity with semi-supervised learning using measurement-while-drilling data 认领 引用
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作者 Jun Wang Qian Fang +2 位作者 Weiguo He Guoli Zheng Jiayao Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4723-4741,共19页
The areal fracture intensity(P21)of the surrounding rock is a critical indicator for evaluating tunnel excavation stability.However,conventional methods often fail to capture geological conditions ahead of the tunnel ... The areal fracture intensity(P21)of the surrounding rock is a critical indicator for evaluating tunnel excavation stability.However,conventional methods often fail to capture geological conditions ahead of the tunnel face.With the development of measurement-while-drilling(MWD)technology,real-time acquisition of surrounding rock information has become feasible.Therefore,establishing a relationship between MWD data and the P21 is of significant importance.This study proposes a semisupervised deep learning framework that combines a multi-autoencoder unit training module(MAUT)with a multi-branch feature extraction network(MBEN).By integrating MWD,construction,and blasting data as dataset input,the proposed model is applied to the Yangjiawopu tunnel.The predicted P21 values exhibited a relative error of less than 10%,confirming the model's superior predictive performance and engineering applicability.Ablation studies demonstrate that both the MAUT module and feature fusion enhance model accuracy.The Shapley Additive exPlanations(SHAP)analysis highlights excavation length,water inflow,and mechanical specific energy(MSE)as key predictors.The model effectively leverages unlabeled data and provides robust geological insights,offering a data-driven approach for early fracture detection and risk assessment ahead of the tunnel face. 展开更多
关键词 Tunnel Areal fracture intensity Measurement while drilling(MWD) Semi-supervised learning
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