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Dynamic evolution mechanism of the fracturing fracture system——Enlightenments from hydraulic fracturing physical experiments and finite element numerical simulation

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Petroleum Science 2024年第6期21卷 3839-3866页

作者： Qi-Qiang Ren Li-Fei Li Jin Wang Rong-Tao Jiang Meng-Ping Li Jian-Wei Feng Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059SichuanChina Sinopec Chongqing Fuling Shale Gas Exploration and Development Company Chongqing 408000China Jianghan Oilfield Oil and Gas Production Capacity Construction Management Center Chongqing 408000China College of Energy Chengdu University of TechnologyChengdu610059SichuanChina School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221018JiangsuChina

This study aims to elucidate the dynamic evolution mechanism of the fracturing fracture system during the exploration and development of complex oil and gas *** integrating methods of rock mechanical testing,logging calculation,and seismic inversion technology,we obtained the current insitu stress characteristics of a single well and rock mechanical ***,significant controlling factors of rock mechanical properties were ***,by coupling hydraulic fracturing physical experiments with finite element numerical simulation,three different fracturing models were configured:single-cluster,double-cluster,and triple-cluster *** with acoustic emission technology,the fracture initiation mode and evolution characteristics during the loading process were *** results indicate the following findings:(1)The extension direction and length of the fracture are significantly controlled by the direction of the maximum horizontal principal stress.(2)Areas with poor cementation and compactness exhibit complex fracture morphology,prone to generating network fractures.(3)The interlayer development of fracturing fractures is controlled by the strata occurrence.(4)Increasing the displacement of fracturing fluid enlarges the fracturing fracture length and *** research provides theoretical support and effective guidance for hydraulic fracturing design in tight oil and gas reservoirs.

关键词： Rockmechanical parameters Petrophysical experiments Hydraulic fracturing physical experiment finite element numerical simulation Dynamic evolution mechanism Fracturing fracture

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Quantitative characterization of interlayer fractures in carbonate rocks based on finite element numerical simulation

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JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 2020年 195卷 107942-107942页

作者： Ren, Qiqiang Feng, Jianwei Johnston, Stephen Peddle, Cameron Du, He China Univ Petr East China Sch Geosci Qingdao Peoples R China Univ Alberta Dept Earth & Atmospher Sci Edmonton AB Canada

Density, aperture and developmental position are key parameters of tectonic fractures in carbonate reservoirs for oil and gas exploration and development. The analysis of fracture development and distribution in interbedded bioclastic and biological limestone and mudstone of Carboniferous and Ordovician age in the Hetianhe area of the Bachu uplift, central Tarim Basin reveal that mudstone thickness, mechanical parameter properties and interlayer frequency are significant factors. A new simulative geo-mechanical modeling method was used to quantitatively calculate the 3D fracture distribution, development and to evaluate fracture penetration behavior through the interlayered mudstone in the vertical. Fractures were deduced from the stress and strain distribution. Interlayered limestone-mudstone models were established, and simulated results were compared with drill core and well logs. The results show that the mechanical parameters (Young's Modulus, Poisson's ratio) are primary factors controlling fracture development. Fracture development and distribution is mainly influenced by the limestone/mudstone thickness ratio where limestone was interbedded with multiple mudstone layers of variable thickness. Pressure is an important control on the generation of fractures, and the nature of lithological surfaces highly influences fracture penetration in interlayered limestone-mudstone. Where the limestone/mudstone thickness>10 (a critical value), the limestone fracture easily penetrated along the contact surfaces. The simulated fracture linear density and aperture are consistent with the observations from drill core and geophysical well logs, and average accuracy was better than 80% in single wells.

关键词： Carbonate stone gas reservoir Interlayered fractures characteristics Mechanical parameter properties finite element numerical simulation

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finite element numerical simulation of Ground Subsidence in Liangjia Colliery

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Transactions of Tianjin University 2002年第3期8卷 200-202页

作者：张力刘锡良王来天津大学建筑工程学院天津300072

Being aimed at the ground subsidence due to underground coal mining,a numerical model of rock was established and an appropriate method of numerical simulation was put *** the measured subsidence data on the ground,the equivalent mechanical parameters of the rock stratums can be back-calculated by the properly treatment of coal excavation area,then the ground subsidence of other coal mining area can be predicted by *** provided reference for the treatment of the buildings on the ground of this colliery.

关键词： ground subsidence finite element numerical simulation back-analysis of parameters

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Influence of aluminum enrichment zone on chloride ion penetration resistance in rubber cement-based materials

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CONSTRUCTION AND BUILDING MATERIALS 2025年 471卷

作者： Zhao, Xingyu Yang, Youzhi Zhang, Jinrui Dong, Biqin Tianjin Univ State Key Lab Hydraul Engn Intelligent Construct & Tianjin 300072 Peoples R China City Univ Hong Kong Dept Architecture & Civil Engn Hong Kong Peoples R China Shenzhen Univ Guangdong Prov Key Lab Durabil Marine Civil Engn Shenzhen 518060 Peoples R China

The incorporation of waste rubber into cement-based materials has garnered significant attention as an innovative solution to both environmental and construction challenges. This study investigated the formation and impact of an aluminum enrichment zone (AEZ) near rubber aggregates, which enhances chloride ion (Cl-) penetration resistance in rubber cement-based materials (RC). The AEZ, consisting of tricalcium aluminate (C3A) and its hydration products, is positioned outside and at a certain distance from the rubber-cement interfacial transition zone (R-C ITZ). The AEZ exhibits higher aluminum content and a broader distribution in its lower region compared to the upper region. The formation of this AEZ is attributed to the hydrophobic nature of the rubber, the upward movement of free water following air bubbles, and the early hydration of C3A. The presence of the AEZ around the rubber aggregates decreases the porosity of the R-C ITZ, improving the Cl- penetration resistance of RC. The effects of the AEZ and R-C ITZ are integrated into an ellipsoidal interfacial transition zone (EITZ). Establishing the relationship between the Cl- permeability coefficient of the EITZ and the rubber aggregate content and particle size. Furthermore, an EITZ finite element model with uneven interface thicknesses was developed, enabling accurate prediction of the Cl- penetration process in RC under an electric field.

关键词： Rubber cement-based material Aluminum enrichment zone Chloride ion permeability coefficient Interfacial transition zone finite element numerical simulation

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Stress field simulation and solidification mechanism of WC/Fe matrix composites at different casting temperatures

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INTERNATIONAL JOURNAL OF METALCASTING 2025年 1-14页

作者： Yang, Lin Shi, Yifan Wu, Di Yang, Zhixiang Zhang, Fei Li, Zulai Kunming Univ Sci & Technol Fac Mat Sci & Engn Kunming 650093 Peoples R China State Local Joint Engn Res Ctr Adv Solidificat For Kunming 650093 Peoples R China

Based on finite element numerical simulation, the stress field, temperature field, and solidification behavior of WC/Fe matrix composites were predicted at casting temperatures of 1425, 1450, 1475, 1500, 1525, 1550, 1575, and 1600 degrees C. The results of the reach demonstrate that the temperature distribution between the preform and the matrix varies with the pouring temperature. The temperature change curve around the preform is observed to be the gentlest when the temperature reaches 1575 degrees C, which is not easy to produce the phenomenon of radical cooling during the solidification process. With the increase in casting temperature, the stress distribution on the surface of the preform shows the trend of increasing first and then decreasing;when the casting temperature is 1575 degrees C, the stress produced on the surface of the preform has a minimum value of 703.2 MPa, and the distribution is uniform. However, as the casting temperature continues to rise, the WC ceramic particles on the surface of the preform are completely reacted and dissolved. As a consequence of the elevated temperature, the temperature of the composite zone declines at a rapid rate during the solidification phase. This results in a considerable discrepancy in temperature between the composite zone and the matrix, which in turn gives rise to a pronounced surge in stress. It was experimentally verified that the WC ceramic particles in the preform and the iron matrix diffused to form a well-bonded interfacial layer during the casting process at a casting condition of 1575 degrees C, and the WC/Fe matrix composite was successfully prepared.

关键词： WC/Fe matrix composites casting temperature finite element numerical simulation stress field Solidification behavior

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Formation mechanism of fault accommodation zones under combined stress in graben basin:Implications from geomechanical modeling

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Petroleum Science 2024年第1期21卷 54-76页

作者： Qi-Qiang Ren Jin-Liang Gao Rong-Tao Jiang Jin Wang Meng-Ping Li Jian-Wei Feng Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059SichuanChina PetroChina Research Institute of Petroleum Exploration and Development Beijing100083China Jianghan Oilfield Oil and Gas Production Capacity Construction Management Center Chongqing408000China Sinopec Chongqing Fuling Shale Gas Exploration and Development Company Chongqing408000China College of Energy Chengdu University of TechnologyChengdu 610059SichuanChina School of Geoscience China University of Petroleum(East China)Qingdao 266580ShandongChina

A fault accommodation zone is a type of structure that is defined as regulating displacement and strain between faults *** numbers of fault accommodation zones are being identified in graben basins,indicating the potential exploration target and petroleum accumulation *** study aims to analyze the formation mechanism and development of fault accommodation zones under combined stress by a numerical simulation method considering geomechanical *** three-dimensional(3-D)seismic interpretation and fractal dimension method,exampled with the Dongxin fault zone,the fault activity and fault combination pattern were conducted to quantitatively characterize the activity difference in fault accommodation *** with mechanical experiment test,a geomehcanical model was established for fault accommodation zones in a graben *** the paleostress numerical simulations and structural physical simulation experiment,the developmental characteristics and genetic mechanism of fault accommodation zones were *** by multi movements and combined stresses,three significant tectonic evolution stages of the Dongxing Fault Zone(DXFZ)were distinguished:During the E_(s)^(3)sedimentary period,the large difference in the stress,strain,and rupture distribution in various faults were significant,and this stage was the key generation period for the prototype of the DXFZ,including the FAZ between large-scale *** the E_(s)^(2)sedimentary period,the EW-trending symmetric with opposite dipping normal faults and the NE-SW trending faults with large scale were furtherly *** junction area of two secondary normal faults were prone to be ruptured,performing significant period for inheriting and developing characteristics of fault accommodation *** the Es1 sedimentary period,the high-order faults in the DXFZ exhibited the obvious fault depressions and strike-slip activity,and the fault accommodation zones were

关键词： Fault accommodation zone Graben basin Fault activity Tectonic physical simulation experiment finite element numerical simulation Dongxin fault zone

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Seismicity changes and numerical simulation of coseismic deformation following the 2022 M_(s)6.8 Luding earthquake in Sichuan,China

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Science China Earth Sciences 2024年第8期67卷 2507-2521页

作者： Qiu MENG Zitao WANG Huai ZHANG Key Laboratory of Computational Geodynamics of Chinese Academy of Sciences College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Beijing Yanshan Earth Critical Zone National Research Station Beijing 101408China

The Xianshuihe fault is a major tectonic boundary between the Sichuan-Yunnan rhombic and Bayanhar blocks in Southwest *** an average left-lateral strike-slip movement of 10–15 mm/yr,it is a fast-moving strike-slip continental *** September 5,2022,the Ms6.8 Luding earthquake occurred along the Moxi segment of the Xianshuihe fault,reaching a maximum intensity of IX and resulting in a significant number of casualties and severe property *** earthquake broke the long-standing seismic quiescence of the Xianshuihe fault,which lasted for more than 40 years,and was followed by a significant number of *** outstanding question is how the behavior of the Xianshuihe fault and major earthquakes changed following this *** this study,we examined the changes in regional seismicity following the Luding earthquake and identified the potential for future strong earthquakes along the Xianshuihe *** used a finite element numerical method to simulate the environment of the seismogenic fault and its adjacent *** addition,we used the coseismic slip model of the Luding earthquake with the split-node method to calculate how the stress and strain fields in the surrounding area were affected by the2022 *** stress changes were resolved in the main faults,and the seismicity of adjacent faults was analyzed in conjunction with the observed seismic *** results indicate that regional tectonic movement primarily occurred to the southeast along the Moxi *** stress field is approximately north-south in tension and east-west in *** in the stress field in the epicentral region of the Luding earthquake exceeded 1 *** maximum displacement of the coseismic deformation field was concentrated between Moxi town and Tuanjie village,and the Coulomb stress of the fault zone in this region experienced the largest ***,the b-value of the Gutenberg-Richter magnitude-frequency relationship at the epicenter a

关键词： Luding earthquake Seismicity Coulomb failure stress change finite element numerical simulation

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Impact Damage Prediction of Carbon Fiber Foam Sandwich Structure Based on the Hashin Failure Criterion

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STRENGTH OF MATERIALS 2024年第3期56卷 628-638页

作者： Yang, K. Zhang, Y. P. Yang, Y. Ji, S. D. Wang, J. Lv, Z. Liaoning Gen Aviat Acad Design Dept Shenyang Peoples R China Shenyang Aerosp Univ Coll Aerosp Engn Shenyang Peoples R China Shenyang Aircraft Ind Grp Co Ltd Data Ctr Shenyang Peoples R China WISDRI Iron & Steel Engn & Res Inc Ltd Consulting Div Wuhan Peoples R China

In the process of use and manufacture, carbon fiber foam sandwich structures were often damaged by low-energy impact, resulting in performance degradation. Therefore, it was necessary to study the damage caused by the low-speed impact of composite sandwich structures. Based on the Hashin failure criterion, this paper established an equivalent finite element model of carbon fiber foam sandwich panels under low-velocity impact. The model was used to simulate the damage of the foam sandwich panel with [+/- 45 degrees/+/- 45 degrees/(core)/+/- 45 degrees/+/- 45 degrees] ply structure under the impact energy of 10.58, 21.17, 31.75, and 42.34 J. The simulation results of impact damage depth were compared with the experimental results. The error was less than 10%, which proved the rationality of the impact equivalent model. The model was used to predict and analyze the damage of foam sandwich panels with [+/- 45 degrees/(core)/+/- 45 degrees], [+/- 45 degrees/ (0 degrees, 90 degrees)/(core)/+/- 45 degrees], and [+/- 45 degrees/(0 degrees, 90 degrees)(core)/(0 degrees, 90 degrees)/+/- 45 degrees] ply structures under 21.17J impact energy. The low energy impact resistance was analyzed by comparing and analyzing the damage situation, impact force response time, and impact velocity response time. The results showed that increasing the number of ply layers [+/- 45 degrees] can reduce the impact damage degree and improve the bearing capacity of sandwich panels.

关键词： carbon fiber foam sandwich structure Hashin failure criterion low-velocity impact impact damage finite element numerical simulation

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Multi-objective optimization based on meta-models of an aeronautical hub including the ductile damage constraint

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INTERNATIONAL JOURNAL OF DAMAGE MECHANICS 2014年第8期23卷 1055-1076页

作者： Meng, Fanjuan Labergere, Carl Lafon, Pascal Duguy, Mathieu Daniel, Laurent Univ Technol Troyes Inst Charles Delaunay F-10004 Troyes France Manoir Ind Grp Paris France

In forging process, geometric design of initial billet and tools is very important. Traditionally, engineers use their knowledge and experience to design and optimize the geometric model of forging process by using trial-and-error methods. Such methods are time consuming and cost expensive. It is therefore interesting to design an automatic tools builder based on optimization methodology coupled with virtual finite element simulations, thus helping engineers to improve products and reduce cost. In this article we describe a meta-model based multi-objective optimization methodology for forging process designed to build the theoric Pareto optimal front of the mechanical problem. We go through a four-step process: building parametric computer-aided design geometry model, simulating the forging process according to the DOE, fitting meta-models, and optimizing the process by using an advanced algorithm. Two different meta-models, including polynomial and kriging methods, are constructed, based on the simulation values for different responses. Then optimization algorithms NBI-NLPQLP and NSGA-II are applied to find the optimum solutions based on each different meta-model. In order to drive this procedure automatically we use ModeFRONTIER (R) software. Using this environment, several macro commands are used to connect the geometry modelling (made with CATIA V5) and numerical simulation process. As an industrial example, a two-step forging of an aeronautic component shows the efficiency of the proposed methodology. That shows contributions of research in dealing with optimization design of die geometry taking into account technological interactions related to the process and the ductile damage inside the deformed part. A set of solutions selected in particular points of the optimal Pareto front are also presented and analysed.

关键词： Forging ductile damage finite element numerical simulation multi-objective optimization meta-model Pareto optimal front computer-aided design

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The effect of fractures on gas injection in Hailar oilfield

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JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY 2019年第1期9卷 409-416页

作者： Wang, Changhao Li, Shibin Northeast Petr Univ Sch Petr Engn 99 Xuefu St Daqing 163318 Heilongjiang Peoples R China

The channeling of CO2 gas is affected by the development of reservoir fractures. In order to improve the gas injection effect, the finite element numerical analysis software Comsol Multiphysics combined with the fluid-solid coupling theory was used to establish the three-dimensional geological model of the Hailar Bei 14 block, and the geostress of the study block was inverted. According to the failure criterion of rocks, the natural fractures of the block are predicted, and the distribution characteristics of artificial fractures are obtained by combining the fracturing situation and fracturing time sequence. Based on the simulation of the pressure field and flow field distribution of the Bei 14, the main effect of the fractures on the gas injection is revealed. The reason of the gas channeling in the Bei 14-X51-59 well is analyzed, which provides an important basis for the formulation of the CO2 flooding scheme.

关键词： CO2 flooding Fracture Gas channeling finite element numerical simulation Fluid-solid coupling

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