bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stress Shadow of fracture Law of Horizontal Well Seam Networks
Authors: Rui Yiming , Yang Chengbin 
Published: September 2020

Abstract
In order to improve the fracturing success rate and modification effect of multistage and multiple cluster volume fracturing in horizontal wells. This paper studies the theoretical model of crustal stress change caused by a single artificial fracture and also considers the superposition distribution model of the stress field. With the increasing net stress, the decrease of Poisson’s ratio, the degree of interference between fractures will become more significant. When fractures reach a certain period, the interference degree remains unchanged. The emphasis of the study lies in the basis for the optimization method of forming active volumetric fractures and establishes a reservoir.
Analysis of the characteristics of flue gas foam seepage and its influencing factors
Authors: Wang Chengjian , Li Binfei 
Published: September 2020

Abstract
The flue gas foam-assisted steam flooding technology is beneficial to inhibit the steam channeling, delay the steam overriding and improve the heat utilization rate. At the same time, it is also conducive to carbon dioxide storage, which has a broad application prospect. However, the current research on the seepage characteristics and influencing factors of flue gas foam-assisted steam flooding is insufficient. In this paper, the sand pack flooding experiments were carried out by changing the gas-liquid ratio, injection rate, temperature, permeability and other parameters. The results showed that in the case of low gas-liquid ratio, the number and size of foams are small and the connectivity between foams is poor. When the gas-liquid ratio is high, the gas-phase composition is high so that gas channeling occurs and the plugging effect is reduced. Experiments showed that when the gas-liquid ratio is 2:1, the resistance factor is the largest and the plugging performance is the best. When the injection rate is 3mL/min, the foam is stable, which is beneficial to the foam plugging. When the injection rate is lower than 3 mL/min, the foam is sparse and the foam liquid film is thin so that the plugging effect is poor. When the injection flow rate is higher than 3 mL/min, more foam with smaller size will be formed under the influence of shear action, and the Jamin effect on the pore throat will be weakened, which is difficult to be plugged by the foam system. With the increase of experimental temperature, the intermolecular force of the solution was strengthened, the foam volume was enlarged and the liquid film was thinned so that the foam stability and the plugging performance were weakened. Oil saturation has a greater impact on the plugging ability of the flue gas foam. The higher the oil saturation, the weaker the plugging ability is. The research can provide reference for the application of flue gas foam plugging technology.
Geological modeling of thin and poor reservoir based on well seismic multi-disciplinary
Authors: Zhang Wen , Wang Jiuxing , Li Zhandong , Qu Guohui 
Published: September 2020

Abstract
The reservoir physical properties of Tai X block are poor and the major development are thin and poor layers. The average porosity is 18.9% and the air permeability is 22.3×10−3μm2, the Tai X block is a low-permeability reservoir. The block has the characteristics of large area, large number of faults, dense distribution of small faults and complex intersection conditions. It is difficult to obtain a high accurate geological model by using only logging data or seismic data, resulting in inaccurate stratiraphic interpretation results. Therefore, the joint well-seismic technique is used to combine logging data with seismic data to achieve the purpose of accurately identifying faults and establishing complete reservoir structure, and successfully deployed a horizontal well across the fault.
Research on environment optimization system of mining operation area based on modern open-pit mine geological structure
Authors: Yan Shen , Fang Yu 
Published: September 2020

Abstract
After studying a large number of mining and excavation sites, the author of this article sampled and analysed the geological structure of the collection area. By comparing the soil geological structure, the degree of environmental damage caused by the excavation process was studied, and a variety of open-pit mine geological structures were analysed and studied. After analysing the relevant data, a modern open-pit mine geological structure of the mining operation area environment optimization system was established. This system can integrate the existing resources of the mine based on the analysis and restoration of ecological vegetation and enter the corresponding parameters., Can design a 3D landscape planning mottled corridor matrix spatial pattern model, combined with the current situation of abandoned land in mining and can be combined with corresponding landscape design strategies (such as artistic aesthetics), the system has the design points of modern engineering technology, in the beautification of the environment Utilizing the existing geological conditions to optimize the environment of the mining operation area has an important auxiliary role.
Study of influences of rock hardness on crack evolution rule under hydraulic fracturing
Authors: Liu Jialiang , Liu Yonghao , Zhu Yujie , Zhou Dongping , He Hua , Zhou Junjie , Wang Kai 
Published: September 2020

AbstractIn order to study the crack evolution rules of hydraulic fracturing rock with different hardness, a numerical model of hydraulic fracturing rock was established. It explored the expansion length, expansion width, propagation rate of crack and initiation pressure of hydraulic fracturing different hardness rocks. The results show that the expansion length, the propagation rate along length and the initiation pressure of crack were positively correlated with the rock hardness, and the expansion width and propagation rate along width were negatively correlated with the rock hardness. In addition, considering the effect of in-situ stress difference, it took granite as an example, and studied the effect of in-situ stress difference on crack propagation. It is found that as the in-situ stress difference increases, the initiation pressure of the crack decreases, and the crack expansion length and the propagation rate along length shows a linear increase, but it has little effect on the crack expansion width. The results can provide theoretical references for improving the application of hydraulic fracturing technology in hard rock excavation, such as the coal roadway excavation, the tunnel excavation and so on.
Rigid-Flexible Coupling Dynamics Simulation of Wedge Press
Authors: Li Qingdang , Li Shuaishuai , Wang Yu 
Published: September 2020

Abstract
In this paper, according to the installation and replacement process of disc single edge hob, the automatic disassembly process of the press wedge of hob is selected as the main object for analysis and research, and a press wedge disassembly device is proposed based on the mechanical design theory, and its structure design and simulation analysis are carried out. First of all, through the understanding of the development and research status of tool change technology at home and abroad, the structure of tool box and the disassembly process of disc hob are analyzed. The disassembly process is divided into three steps, and the expected path curve is obtained by cubic spline interpolation. Secondly, a kind of wedge removal device is proposed and designed. The design scheme is divided into two parts: wedge clamping mechanism and path guiding mechanism. The functional requirements and mechanism realization methods are discussed respectively. The wedge clamping mechanism realizes the clamping power by transforming the traditional three claw chuck, and the path guiding mechanism adopts the two degree of freedom mechanical arm to realize the wedge pressing along the expected curve path In order to verify its feasibility and rationality, the nx10.0 software is used to build the three-dimensional assembly model of the wedge removal device. Then, the trajectory planning simulation of the two degree of freedom manipulator is carried out, the manipulator model is established by using Matlab / Robotics toolbox, and the correctness of the kinematic equation is verified by comparative solution; the workspace of the manipulator is obtained by Monte Carlo simulation, and the correctness of the theoretical working area of the manipulator is verified by comparison; the method of quintic polynomial and cubic spline interpolation is adopted Methods the multi node trajectory planning of the manipulator joint was carried out, and the displacement, velocity and acceleration curves of the two joints of the manipulator were calculated based on the intermediate data points of the expected path, which verified the good motion stability of the manipulator. Finally, the virtual prototype model of the wedge removal device is established by the joint simulation method of Adams and ANSYS, and the rigid flexible coupling dynamic simulation analysis is carried out to simulate the movement track of the wedge in the removal process, which is basically consistent with the expected path curve, which verifies the feasibility of the removal device; the stress distribution of the connecting rod is evaluated and analyzed to verify that the connecting rod can meet the material requirements Material strength requirements.
Experimental Research on Rotation-Percussion Drilling of Diamond Bit Based on Stress Wave
Authors: Ding Yu , Tan Zhuoying , Li Shuguang 
Published: September 2020

Abstract
Rotary-percussive drilling is a common form of drilling in geotechnical engineering. in order to study the effect of rotational speed and impact speed on rock-breaking efficiency, a drilling simulation platform developed by ourselves and a drill pipe equipped with diamond bit were used to conduct simulated drilling experiments. By monitoring the stress wave during drilling, the strain, stress and energy changes at different rotational speeds and impact velocities can be obtained, and the optimal drilling parameters can be determined. The results show that both speed and impact velocity have direct influence on the drilling process. When the rotational speed is kept constant, the drilling efficiency increases first and then decreases with the increase of the impact velocity. When the impact velocity remains constant, the drilling efficiency decreases with the increase of rotating speed. With the increase of rotational speed, the optimal impact velocity also increases. It is helpful to improve the drilling efficiency by reasonable choice of speed and impact speed.
Effect of Silicone Waterproofing Agent on the Properties of Ceramic Recycled Aggregate Cement Mortar
Authors: Zhao Liang , Yao Shuang , Huang Xinyi , Liu Ting , Qin Fang 
Published: September 2020

Abstract
The ceramic waste were crushed and sieved to replace partially the sand to prepare cement mortar as aggregate, and different quality of silicone waterproofing agents were added to study the effects on the mechanical properties and water absorption under natural curing conditions. The experimental results indicated that through 28 days of natural curing, the flexural strength of ceramic recycled aggregate cement mortar was 1.18% higher than that of ordinary cement mortar, the compressive strength is 2.94% lower, the water absorption is 0.5% lower, which means the performance difference is not obvious. With the increasing amount of the silicone waterproofing agent, the compressive and flexural strength of the samples gradually decreased, and the water absorption decreased first and then increased. When the amount of waterproofing agent is 2%, the comprehensive performances of the sample were the best: the28-day flexural strength was 6.84 MPa, the compressive strength was 42.8MPa, and the water absorption was 4.66%.
Study on Hydrogeological Prospecting Technology of Healthy Environment for Urban Residents
Authors: Yang Xudong , Ji Lei , Yu Tianbo 
Published: September 2020

Abstract
Hydrogeological survey is the focus of environmental geological survey. Hydrogeological disasters have a greater impact and are closely related to the healthy living environment of residents. Understanding the actual situation of the hydrogeological environment through survey work can provide a reliable basis for disaster prevention and control. In this regard, the article will take hydrogeological survey as the research object, and conduct in-depth research on the content and main points of hydrogeological survey in environmental geological survey.
Tectonic Characteristics of the East Sichuan Basin and Regional Tectonic Evolution Characteristics of Regional Tectonic Belt
Authors: Zhang Ruigang , Luan Jinhua , Chen Yang , Chen Fei , Liu Yongwang 
Published: September 2020

Abstract
Most sedimentary basins in China have undergone multi-stage tectonic evolution. This paper takes the eastern Sichuan region as the research object and relies on modern geological research methods to systematically study the basin’s dynamic characteristics and tectonic evolution process in the eastern Sichuan region. The results show that the tectonic squeezing of SW and NW from the Daba Mountain orogenic belt and the Jiangnan-Xuefeng Mountain orogenic belt, respectively, make eastern Sichuan a complex structural interference zone that is both combined and compounded. The eastern Sichuan NE and NW structural combinations The type clearly records the structural transformation effect of the two. The history of tectonic evolution since the Middle Paleozoic in the eastern Sichuan Basin is divided into five phases: the deposition of source rocks of the Wufeng Formation-Longmaxi Formation in the Caledonian Period and the parallel unconformity contact with the overlying strata caused by the end of Silurian tectonic compression; Haixi The tectonic transformation of the Early-Indochina period is mainly manifested by the inheritance of the Caledonian period, and the interaction between the Devonian-Early Carboniferous strata and the early Indosinian marine facies and terrestrial sediments is lacking, and the fold deformation in the region is weak. In the early period, a series of NE-directional faults formed mainly in the eastern Sichuan region during the NNW-SSE compression. In the late Yanshan-Early Himalayan period, the NNW-SSE ~ NWW-SEE compression became stronger than in the early Yanshan period, and the eastern NE NE-boundary faults formed. In the late Himalayan period, NE-SW was squeezed. The Wujiang fault system at the border of the southeast of Sichuan was mainly formed during this period, and the southern strata were obviously transformed by this period.
Sequence stratigraphic division of the Shisanlitai Formation of Neoproterozoic in Southern Liaoning, China
Authors: Wu Zijie , Zhang Guoren , Gao Fuliang , Wang Haipeng , Qiu Longwei , Sun Qi , Yu Feng , Zhong Mishan 
Published: September 2020

Abstract
Sequence stratigraphy is the most important prediction theory in the field of petroleum exploration, and is hailed as a theoretical revolution in geology. At present, countries around the world have begun to pay attention to the study of marine carbonate rocks. The Shisanlitai Formation in Dalian, Liaoning is an important Neoproterozoic stratum in China, with a large number of carbonate rocks. Through comprehensive analysis of the field measured profiles, the sequence stratigraphy of the Shisanlitai Formation was studied. A total of 4 sequence boundary were identified, and 3 sequence, 7 para-sequence sets and 20 para-sequences were divided. It is considered that the Shisanlitai Formation is a platform marginal sedimentary facies. The regional geotectonic and astronomical cyclic methods are used to discuss the environmental evolution of the Ganjingzi Formation. Platform marginal beach → platform marginal slope → platform marginal reef evolution process, and summarized that there were 4 short exposures from the end of the Majiatun period to the Shisanlitai Formation period in the Dalian area affected by the low-amplitude tectonic ups and downs in the late Yangtze cycle 4 sequence boundary and 3 sequences are formed. Through comprehensive and systematic analysis of the sequence stratigraphy and sedimentary evolution of the Shisanlitai Formation, it provides a basis for exploring the oil and gas resources in southeastern Liaoning.
Seismic Sedimentary Technology and Its Application in Deposition Analysis of SQ7 in Shannan Region
Authors: Han Xiaofeng , Huang Yunfeng , Wei Lihua 
Published: September 2020

Abstract
The thickness of SQ7 sand body in Shannan area is thin, the lateral variation is fast, the distribution of sedimentary sand body is not clear, and the conventional sedimentary analysis method and reservoir prediction technology can not meet the requirements of fine oil and gas exploration. On the basis of the principle and research method of seismic sedimentology, the lithologic reversion of seismic profile was carried out by using 90° phasorization, and seismic sedimentology was carried out to study the plane distribution characteristics of SQ7 sand body in this area by using the technique of stratum isochronous section. Based on the analysis of seismic attribute sections and lithologic time sections under the equivalent time frame, the temporal and spatial evolution law and sedimentary microfacies of braided river delta deposits in the southern source system of the SQ7 period in this area are revealed. The distribution of sand body is described in detail, which provides the basis of seismic deposition for oil and gas exploration and deployment.
PML absorbing boundary condition for structure-preserving seismic wave modeling
Authors: Zhu Tong , Wang Yu , Sun Zhentao 
Published: September 2020

Abstract
Some efficient structure preserving algorithms have been proposed for high precision seismic exploration and detection in recent years. However, feasible artificial boundary conditions to truncate unbounded medium are never discussed in structure preserving seismic modeling. We pay our emphasis on application of perfectly matched layer absorbing boundary condition (PML ABC) to fit the structure preserving algorithms. In the domain of interest, a typical structure preserving algorithm is presented to discretize the conservative dynamic system, while in the PML region, traditional central difference is applied to solve the dissipative system. In the adjacent region of the interior and exterior domains, the temporary values of wave field between two time steps are approximated by interpolation using the present and the updated value of the wave fields in the PML region. A numerical experiment is adopted to demonstrate compatibility of the algorithms and no visible reflections of outgoing waves occur on the edge of interior domain.
Observing Dynamic Deformation of Masonry Wall in Vibration through Digital Photography and Kalman Filter
Authors: Liu Xiaodong , Tang Wei , Zhang Guojian , Yu Chengxin 
Published: September 2020

Abstract
Masonry structure is one of the common engineering structures, they encounter brittle fractures and even collapse in earthquakes, posing a major threat to the safety of human beings and property. This drives a need to monitor their dynamic deformation during earthquakes and study the seismic performance of masonry structure. This paper uses digital photography to monitor dynamic deformation of masonry structure in vibration. Kalman filter is used to eliminate the random noise and filter the change value of the pixel. Finally, the filtered value is converted into the actual displacement value by the time baseline parallax method. Results show that the relative measurement accuracy is 2.13‰ after using kalman filter to process deformation data. In the early vibration stage, masonry structure develops less deformation and it is in elastic state. The deformation of masonry structures increase gradually with the vibration being stronger. Digital photography can monitor the dynamic deformation of masonry structure in real time and grasp its health status. It can provide technical and data support for studying seismic performance of masonry structure.
The application research of a main machine hall for a thermal power plant with BRB
Authors: Xue Tao , Xing Guolei 
Published: September 2020

Abstract
As a kind of energy dissipation brace members by the yielding of metal, Buckling Restrained Brace (BRB) can overcome shortcomings of the common brace’s compression buckling, which has good energy dissipation capacity and ductility in earthquake. To study the Buckling Restrained Brace effect in the main machine hall, the nonlinear finite element analysis software ABAQUS is adopted to analyze the seismic performance of a main machine hall with BRB under the action of the rare earthquake and compare the elastic-plastic analysis results under the action of different seismic wave in this paper. The results show the structural seismic performance has been improved significantly, “no collapse under strong earthquake” can be achieved.
Study on Structural Improvement of Loess by Waxy Rice Powder in Weak Acid Environment
Authors: Tang Xiaowu , Yu Yue , Fei Minliang , Sun Guoping , Zhao Wenfang 
Published: September 2020

AbstractWaxy rice is widely used in many ancient buildings due to their good performance in some fields (such as caking property, impermeability, weatherability, etc.). In the humid environment of South China, the excavation of ancient sites is faced with many problems, especially for sites with deep burial depth, it is necessary to set support and minimize the impact on the site environment. In the excavation project of Jingtoushan site, located in the town of Sanqi, Yuyao, Zhejiang Province, China, the loess between the steel structures supports needs to be reinforced. Waxy rice, as a traditional Chinese building additive, was used as the reinforcement of this project. Therefore, it is of great significance to explore the best proportion of waxy rice powder mixed with loess. In this paper, the standard columns with different proportion of waxy rice powder were made, and the uniaxial compression tests were carried out after curing for 0~180 days in standard humid environment (25°C and 60% humidity). It was found that the soil columns with 2% waxy rice powder had the best improvement effect. Due to the weak acidity of groundwater in South China, loess specimens mixed with 0%, 1%, 2%, 3% waxy rice powder was soaked in acetic acid solutions of 0mol/L, 0.5mol/L, 1mol/L and 2mol/L respectively, and the consolidation fast shear test, SEM test and mercury injection test were completed. The results show that the overall structure of the specimen is improved when the concentration of acetic acid is low. Acetic acid dissolves the calcium carbonate in the loess-waxy rice structure, quickly and effectively destroys the poor pore structure in the loess, and makes the waxy rice powder filled as the binder between the soil particles, forming a new structure. The improved structure has strong shear strength. When the concentration of acetic acid is high, the cementitious substance between the soil particles dissolves and the pore content increases. The waxy rice powder is not enough to fill the extra pores. Therefore, it is suggested that the proportion of waxy rice powder should be more than 2% in the areas with strong acidity. The study provides a useful reference for the excavation and follow-up protection of earthen sites in the acid environment of South China.