bluuebunny/crossref_metadata_2025 huggingface dataset:
Multiplayer Repeated Game of Environmental Protection between Government and Enterprises
Authors: Tang Yuan , Huang Yuanyuan
Published: September 2020

An important source of environmental pollution in our country is industrial enterprises, which have caused great damage to the ecological environment. The government continues to pay more attention to environmental protection, while enterprises aim to maximize their own interests, to the detriment of the overall social interests. We propose a probability game with economic incentive mechanism between government and polluting enterprises. In the game, each enterprise decides whether to invest in environmental protection. Considering the benefits of selfish enterprises, local governments, as managers, adopt a zero determinant (ZD) strategy for enterprises. This strategy has played an important role in minimizing social costs. It has introduced the entire society’s environmental protection investment into the game. We simulate the game model to evaluate the performance of the ZD strategy numerically.
Development Status, Trends and Challenges in the Field of “Blockchain and Education”
Authors: Zhou Liming , Lu Ran , Wang Juan
Published: September 2020

Blockchain, as the underlying technology of bitcoin, has gradually attracted the attention of the industry. At present, it has been used in many fields such as the financial industry and the service industry, and has great potential for application in the field of education. This article briefly introduces the blockchain technology, and at the same time explores and analyzes the development of the blockchain technology. This article starts with the relevant core literature in the field of “blockchain + education” in China, and understands the development trends of the blockchain technology. The research hotspots in the education field focus on the in-depth analysis of the research on blockchain technology in the field of education resource sharing and education information management, so as to grasp its current research status. Finally, based on the implementation of the blockchain technology in the implementation of the project, it discusses the facing challenges and proposes a new path for innovation and development looking forward to provide a reference for the deep integration of blockchain and education.
Manufacturing Enterprises Information Platform Construction Based on the Full Value Chain Concept
Authors: Wu Jianglong , Luo Xudong
Published: September 2020

The key to the effectiveness of management is undoubtedly to do the right thing and do the right thing. At present, with the rapid development of information technology in the Internet era and the increasing complexity of enterprise management level and business chain, how to make good decisions on what to do, how to do it, who to do it and other issues, to ensure that the overall operation quality and efficiency of enterprises are better, and steadily achieve the strategic objectives of enterprises, has become a management problem faced by most enterprises, especially group enterprises. Therefore, how to effectively allocate resources and realize a virtuous circle of the entire value chain during the dynamic operation of the enterprise is of vital importance. Based on the concept of operating Rubik’s Cube, this article establishes a management and control model of the enterprise value network system to continuously improve the comprehensive competitiveness and resilience of the enterprise, and provide solutions for other groups.
Analysis of the Linkage between South African’s Exchange Rate and Stock Price Index
Authors: Hsueh Hsin-Pei , Li Fangjhy , Liu Changqing
Published: September 2020

In this study, we used a wavelet analysis method to analyze how stock price index is correlated with exchange rate in South African stock market andinterest rate was choosen as the control variable. As indicated by the empirical results, first, stock index is significantly correlated with exchange rate in the stock market of South Africa, no matter in the short term (1-4 years) or the long term (4-8 years). There is a significant correlation period, with correlation coefficient greater than 0.8. Second, for the short-term (1-4 years) relationship, after adding control variables, South Africa’s short-term negative correlation will be led by the stock exchange rate. That is, in condition of the negativity of both stock market and exchange rate, the stock market leads. And interest rate greatly affects the short-term (1-4 years) exchange rate and the stock price index in South Africa. And in the short term, the linkage between those two variables is not subject to the influence of 2008 financial crisis. Third, for the long-term (4-8 years) relationship, when we add control variables, regardless of its term, there is a negative correlation between stock market index and exchange rate in South African stock market, and stock market affects exchange rate. The long-term (4-8 years) correlation of stock price index and exchange rate in South African stock market was affected by the 2008 financial crisis. South African market is indeed the goal for investors to participating enthusiastically now. The above conclusions can serve as a lesson for hedging in corporate exchange rate, stock market, and also reference for global investors and all sorts of investor asset allocation.
Technology of Water Injection Development in Ultra-Low Permeability Reservoir
Authors: Zhang Weili
Published: September 2020

In order to further explore the technology of water injection development in ultra-low permeability reservoir, the Chang 6 reservoir in S area is taken as an example in this study to analyze the characteristics of single-phase seepage, dual-phase seepage, and water injection development in ultra-low permeability reservoir. The experimental results show that the reservoir has poor physical properties and complex pore structure. The flow of single-phase oil/water in the reservoir is non-Darcy flow; it restricts each other for the dual-phase flow, which seriously affects the effective flow capacity, resulting in high injection resistance. It is found based on the water injection experiment that the initial mining degree is relatively high, and the average water driver recovery factor in the core of ultra-low permeability sandstone is 49.9%, and the physical properties have no direct impact on the recovery level. Therefore, the technology of water injection development has certain feasibility and rationality in the exploitation of ultra-low permeability reservoir, and can be used in the practical exploitation.
Experimental Study on Mechanism of Foamy Oil-Assisted Methane Foam Flooding in an Etched Glass Micromodel
Authors: Zhang Yanyu , Gong Hangfei , Sun Xiaofei , Wang Xiangyu , Nie Jiacheng
Published: September 2020

A number of heavy oil reservoirs under cold heavy oil production with sand (CHOPS) show anomalously good primary performance due to foamy oil flow. However, as the pressure of the reservoir depletes, the foamy oil phenomenon gradually disappears and the development gradually deteriorates. In this paper, a new method named methane foam flooding is proposed as an effective enhanced heavy oil recovery process. In this paper, we take advantage of Ross miles foam equipments to select foaming agents and evaluate the foam ability, study and analyze the foam ability of different foam agent in different concentrations. and through visual microscopic model experiments to study the oil displacement mechanism and flow characteristics of methane foam flooding. The results show that foaming agent ZY-1 has excellent foam comprehensive properties, and it has the best foam stability at 1% concentration. It can be found from the micromodel flood experiments that methane foam flooding can effectively block the formation of high permeability channels, delaying the production of methane gas, emulsifying crude oil and changing the wettability of the rock to enlarge a sweeping volume and improve oil displacement efficiency.
Feature Analysis and Target Detection of High-resolution Remote Sensing Image of Coal Mining Subsidence Area
Authors: Zhang Haowei , Zhang Jin
Published: September 2020

Aiming at the phenomenon of regional ground collapse caused by mining, the site information is obtained through field investigation, and the features of typical collapse targets are described. The drone remote sensing images are used to extract and analyze the color features and shape features of typical collapse targets. Combine the Hough transform, shadow and Harris corner detection methods to achieve the target detection of collapsed pits and trough collapsed areas. The combined method uses Hough transform to detect the edge shape curve of the collapsed pits and trough collapsed areas, and use shadow detection method to extract its internal areas, and Harris corner detection method is used to locate local feature points in the image. Experimental analysis results show that the method has good application effect on target detection in collapsed pits and trough collapsed areas.
Error Correction Method of Crude Oil Moisture Content Detection Based on BP Neural Network
Authors: Dong Pengmin , Zeng Xianghu , Duan Chengcai , Wang Tianqi , Luo Shichong , Wang Peng , Guo Qianqian , Zhao Haikong
Published: September 2020

Microwave phase-shifting sensor is one of the effective means to realize online detection of water content in high water-cut crude oil, but its detection accuracy is easily affected by salinity. Aiming at the mineralization components (NaCl and CaCl2) existing in water-bearing crude oil, the influence of different proportion and content of dual-component mineralization on the accuracy of microwave phase-shifting crude oil water content detection sensor was studied experimentally, and the influence rule of dual-component mineralization (NaCl and CaCl2) on the accuracy of crude oil water content detection was obtained. It is difficult to establish an accurate error compensation model because the relationship between the composition and content of salinity and the measured water content is affected by many factors. Therefore, a BP neural network model for error correction is established, which reduces the detection error of microwave phase-shifting crude oil moisture sensor from 13.912% to 1.821%, and improves the detection accuracy. BP neural network prediction model is superior to multiple linear regression prediction model.
Experimental study and numerical analysis of fluid-structure coupling vibration characteristics for the reciprocating compressor pipeline
Authors: Yuan Wei , Deng Guide , Yang Zhirong
Published: September 2020

The fluid-structure coupling has been one of the hot issues of academic research in recent years, the achievements in various fields of study also emerge in an endless stream, but on the current research status, The study of fluid structure interaction in the field of dynamic equipment, especially compressor, is not very common. With the development of industrial compressors in the direction of large-scale and high-parameters, the analysis of coupling characteristics represented by fluid-solid coupling can evaluate the safe and stable operation of the system, and the evaluations are ofen more close to the actual situation. Therefore, it has gradually been valued. Through the comparison and analysis of the vibration test system of the reciprocating compressor before and after the pipeline inflation, the vibration response caused by the coupling factor is obtained, for the correctness verification of the fluid-structure coupling simulation. the numerical model of the experimental system is established based on ANSYS WORKBENCH, and the boundary conditions of the model are simulated by the experimental data, verified the feasibility of simulation program. Finally, the effects of medium density, pressure, flow rate, elastic modulus of pipe and Poisson’s ratio on fluid solid coupling vibration are discussed by using the verified simulation model. The results show that the medium density, dynamic fluid flow rate and pipe Poisson’s ratio have relatively little influence on the fluid-solid coupling vibration of the pipeline, while the medium pressure and the elastic modulus of the pipe have a great influence.
Numerical Simulation of Surface Deformation in Goaf
Authors: Hu Dingkang , He Nainan , Gao Debin
Published: September 2020

Coal mine goaf is a hidden, complex, surface deformation of a large range and easy to cause geological disasters of the bad construction site, the surface engineering construction of great harm. The uneven subsidence, horizontal movement, deformation, collapse and other disasters of the goaf surface have serious potential safety hazards for the construction and operation of the project. At the same time, secondary disasters such as ground collapse and collapse caused by surface movement and deformation also occur from time to time, which seriously threaten the safety of construction projects. In this paper, Flac3D is used to conduct a three-dimensional numerical simulation study on the goaf of jinjie coal mine, and the surface deformation law of the goaf is obtained by analyzing the horizontal movement, vertical settlement, horizontal deformation and inclined deformation of the goaf, which provides a theoretical basis for the surface deformation management of the local goaf.
Research on Laser Distance Measurement Technology for Remaining Volume of Large Open-pit Material Yard
Authors: He Hongwei , Zhai Shaolei , Zeng Shufan , Fu Kunpeng , Ruan Jun , Wang Yuyuan
Published: September 2020

In view of the problems of low volume calculation accuracy, long data acquisition period, and inability to uniformly measure and calculate the storage yard type when measuring the storage of large yards using volume and density conversion, a high-speed laser scanner, distance sensor, angle sensor, and pitch sensor are proposed Integrated technology, quickly obtain the three-dimensional coordinate data of the yard, and derive a unified three-dimensional coordinate solution algorithm, establish a three-dimensional coordinate system of the yard space to solve the three-dimensional coordinates of the yard, and accurately calculate the storage volume of the yard. At the same time, the system construction architecture, composition, data processing methods and issues to be considered are proposed. This method effectively solves the problems faced by the existing measurements in large yards, and improves the measurement efficiency, accuracy and safety. Under the test conditions, the absolute accuracy reaches 0.4%. Several project examples show that the method is simple, efficient and accurate. The ordinary measurement time of a 200m stockyard does not exceed 20mIn, and the repeated measurement error of the measurement volume is less than 0.7%. It has good application prospects and popularization value.
Investigation on Combustion Characteristics of Methanol-Syngas Fuel
Authors: Chen Yexin , Jiang Yankun
Published: September 2020

Methanol has a broad application prospect in internal combustion engine due to its renewable and environment-friendly characteristics. In this research, a method of using mixture of methanol and syngas as internal combustion engine fuel is proposed, while the syngas is produced by dissociating the methanol through making use of the exhaust heat of the engine. By analyzing reaction path of fuel oxidation and sensitivity analysis of elementary reactions, the effect of syngas on the oxidation process of fuel was studied. The effect of blending ratio and equivalence ratio on ignition delay time and laminar flame speed was investigated. The research results can provide theoretical guidance for the application of methanol-syngas fuel in internal combustion engine.
Biomass Pyrolysis Liquefaction Technique: State of Research and Development Trends
Authors: Li Jie , Li Nan , Qiao Yingyun , Zong Peijie , Wang Chengbiao , Tian Yuanyu , Qin Song
Published: September 2020

Biomass as the only renewable carbon sources in nature are considered to be huge amount, environmentally friendly and carbon neutral resources. Exploiting biomass as an energy utilization not only maximizes deal with the agricultural and forestry waste, but also refining high value-added bio-based chemicals products. As one of the important means of bio-refinery conversion processes, biomass pyrolysis liquefaction technique (BPLT) has been popular in producing fuel product since the late 1970s due to its advantages in its short process, strong adaptability, rapid response, high conversion rate and easy commercialization, etc. This paper provides an overview of current research progresses in the BPLT. Summarizes the latest research results of the combined processes for BPLT in feedstock pretreatment, pyrolysis liquefaction process and bio-oil upgrading. In the section of feedstock pretreatment, three methods of microwave drying, baking and pickling are introduced. In the section of pyrolysis process, two new processes of catalytic pyrolysis and mixed pyrolysis are discussed. The final part of the paper deals with recent technologies from five aspects in the bio-oil upgrading: catalytic hydrogenation, catalytic cracking, catalytic esterification, emulsified fuel and separation and purification. Afterward, the paper analyzes the industrialization development trends of BPLT. The paper suggests that make the production and upgrading of pyrolysis oil to hydrocarbon fuels is an economically attractive path. By critically evaluating their potential and challenges, we finally conclude, with the continuous maturity of various technical links such as feed prep, fast pyrolysis and upgrading, BPLT is expected to form a relatively complete technology industrial chain within 5 to 8 years, and gradually realized the industrialization in the true sense.
Intelligent Measurement and Adjustment of Layered Wells Achieve Precise Water Injection and Improve Measurement and Adjustment Efficiency
Authors: Liu He
Published: September 2020

The conventional layered water injection well test uses the wire and cable connection method. During the test, it is necessary to repeatedly drop and remove the test instrument and tool, use the test tool to detect the flow, and use the fishing plug to adjust the water nozzle. The deployment efficiency is relatively low. The intelligent measurement and adjustment system for layered wells is powered by cables to achieve real-time signal transmission. It has online sealing, nozzle-free fishing, continuous adjustment, real-time direct reading of test data, real-time monitoring of layered deployment parameters, shortening test deployment time, and improving with the advantages of measurement and adjustment efficiency and accurate water injection, field tests show that the intelligent measurement and adjustment system for layered wells has good application and promotion value.
Experimental Study of Magnetic Leaking Stoppage Device used on Gas Cylinder
Authors: Chen Jie , Huang Song , Zhao Zhongguo , Xiong Shutao
Published: September 2020

In view of the current necessity of the road transportation safety of the dangerous goods, the lack of effective emergency blocking technology is the Current issues that need to be focused on. This paper designs a kind of emergency blocking equipment for the leakage of dangerous goods transport vehicle tanks. By introducing a strong magnet and blocking with a rubber layer, the leakage on the surface of the ferromagnetic equipment can be quickly blocked. A simulated test of the designed 1.5 MPa leak stopper was carried out on a vechicle gas cylinder. The test results showed that there was no pressure drop in the gas cylinder during the holding time of 1.5MPa, and the leak plugging effect was better, which can be widely used in maintenance work. In addition, the continuous test found that the leakage limit pressure at the shoulder and bottom of the gas cylinder is lower than that at the cylinder body, and it should be focused on in the subsequent promotion process.
Research on PID Control of Water Level in Pile Legs Based on Improved PSO
Authors: Sun Zhaocai
Published: September 2020

Aiming at the problem of poor water level control effect during mud dredging in pile legs, based on the research of traditional PID algorithm and particle swarm algorithm, a PID parameter optimization method based on improved PSO(IPSO)was proposed. This paper adopts a nonlinear dynamic adaptive inertial weight (ω) method and introduces a time factor to adjust the position update time. In this paper, a mathematical model of the water level control system in the leg is established, and the system is simulated by MATLAB / Simulink. By comparing the simulation results, PID controller optimized by improved PSO is better than traditional PID controller. The proposed method provides a theoretical reference for the water level control system during the mud dredging operation in the pile legs.
Research on Open Mining Intelligent Equipment Based on Internet
Authors: Zhang Yongming , Qiao Jianqiang
Published: September 2020

Based on the establishment of mines, the use of advanced industrial Internet technology, based on the solid model and block model, using 3DMine smart equipment software to study the intelligent collection equipment of open pit mines, through the intelligent research of equipment, research and development It has developed advanced quota intelligent equipment, including intelligent sorting system and intelligent collection device system, etc., and discussed the influence and application of different intelligent equipment in the state of open pit mine. The preliminary design provides a technical plan and decision basis for smart equipment.
An Analysis of Progress and Models of Local Green Mining
Authors: Huang Jie , Guo Dongyan , Hou Huali
Published: September 2020

The development of green mining is an important measure to improve the ecological civilization construction in the mining field and build a beautiful China. On the basis of extensive research, the author analyzes the development progress of green mining in China from 7 aspects. Based on the unique practical experience of various regions, the author summarizes four development models, namely: multi-industry integration development model, integrated development model of mining, processing, manufacturing and transaction, comprehensive development and utilization mode of mine and land, and layout optimization driving model, and analyzes the problems faced by green mining in three aspects: technological innovation, working mechanism, and system construction. Based on this, countermeasures and suggestions are proposed: the first is to promote technological innovation, develop and promote new efficient technologies in the development and utilization of mineral resources; the second is to promote management innovation and establish a new working mechanism for green mining; the third is to promote institutional innovation and effectively play the guiding role of policies.
Evaluation of the Transformation and Development of Mining Industry in China from 2010 to 2017
Authors: Guo DongYan , Huang Jie , Hou Huali
Published: September 2020

The transformation and development of mining industry is the inevitable choice based on the economic society of China of China under the new development concept. This paper builds an evaluation index system for the transformation and development, and uses a comprehensive evaluation method to calculate and analyze the transformation and development the mining industry in China from 2010 to 2017. The results show that: Over the past eight years, the transformation and development of the mining industry has increased steadily, and the transformation development index has increased from 1 to 1.677, an increase of 67.7%. The four sub-indexes, namely the average output value of mine, proportion of mining industry, proportion of large and medium-sized mines, and proportion of clean energy production, are all in good agreement with the trend of the transformation and development index. In different historical periods, the significance of the promoting effect is different. In the future, it is necessary to implement comprehensive strategies for the improvement of the transformation and development of mining industry in China.
Design of Bidirectional Wireless Transmission System Based on Wellbore Pressure Pulse Signal
Authors: He Tong
Published: September 2020

To solve the problem that the downhole data cannot be transmitted in real time and the downhole condition cannot be known in time during the well injection process, the downhole data wireless transmission technology was designed and developed. The wireless transmission method of downhole data signal was studied and the data encoding method was invented. The control circuit of intelligent measuring and adjusting instrument was designed for layered water injection. In 2019, the field test was carried out, which verified the feasibility of downhole data transmission method. The preliminary success of the wireless downhole data transmission technology can promote the development of intelligent well injection technology.
Power system reliability analysis
Authors: Feng Xiwen , Tong Fei
Published: September 2020

Electric power development is the key factor of economic development, but also an important guarantee of industrial modernization. At present, with the improvement of people’s quality of life, electricity has become an indispensable part of ensuring people’s lives. Therefore, the stable and reliable development of power system has an important impact on economic development, industrial modernization and people’s lives. With the continuous maturity of the reliability theory, the power system and its combination have evolved into an important application subject called the reliability evaluation of the power system, which has penetrated into the whole industrial chain of the power system, which is a reliable guarantee for the industrial chain to gain economic and social benefits. Based on the analysis of the operation reliability of power system, this paper puts forward the main measures to improve the operation reliability of power system in order to meet the operation requirements.
Study and Application on Production Decline Law of Water Drive Characteristic Curves
Authors: Zhao Hongyue
Published: September 2020

Water drive characteristic curves and production decline curves are two important method to evaluate the recoverable reserves of oil field and predict development index. In this paper, we begin with deducing of Arps decline rules, and concluded that if the relationship of production decline rate of the same or similar model, they have the same or similar development index. According to this law, four kinds of commonly used water drive curve was deduced with oil production decline rate under the condition of fixed liquid. And Using this relationship, we established the method to prediction each year (month) development index of four commonly water drive curve. Through example, with the industry standard of recoverable reserves, compared to the results of the calculation formula of achieved higher prediction accuracy, and precision increases along with the time step narrowing of set, and the precision can be controlled. The research of this paper provides a basis for the prediction of water drive characteristic curve development index, and a basis for the selection of the recoverable reserve, and a method and reference for the further study of the water characteristic drive curve.
Research on Computer Algorithm of Mine Gas Release Source Location Based on Multi-source Sensor Fusion
Authors: Nan Jiangping , Dai Xuezhen
Published: September 2020

Aiming at the problem of gas leakage source difficult to locate or inaccurately located due to the air leakage phenomenon in the goaf of coal mines, this paper proposes a mine gas emission source location algorithm based on multi-source sensor fusion. Firstly, by analyzing the gas distribution law of the goaf in the fully mechanized caving face, the sensor observation model and the gas release source diffusion model of the mine goaf are established, and then the machine learning positioning algorithm is used to estimate the parameters of the gas release source in the goaf and according to the iterative calculation The coordinate positions of the estimated parameters are obtained. Finally, the data fusion of the wireless sensor target source sensing node and the cluster head node is used to achieve the precise positioning of the gas release source. The results show that: compared with other algorithms, machine learning algorithms have obvious advantages in positioning accuracy. This method can effectively solve the problem of difficulty in locating the gas release source due to the air leakage phenomenon, and then provide a reference basis for gas prominent warning and gas extraction in the goaf.
Thin-wall bearing contact characteristics analysis and deformation research
Authors: Meng Dezhang , Wang Yanjun , Gao Pengyuan , Liu Lei
Published: September 2020

Considering the elastic deformation of the bearing ring structure, a nonlinear contact model of the thin-walled deep groove ball bearing (61856) was established. The contact stress and deformation of the thin-walled deep groove ball bearing were simulated and analyzed under the two conditions of rigid and flexible constraints. The distribution law of contact stress and deformation of bearing rolling elements and different parts of inner and outer rings was studied. The comparison between the simulation results and the test data shows that the error between the simulation results and the test data is relatively large under rigid constraints, which is not suitable for the analysis of the finite element mechanical characteristics of thin-walled bearings. However, it has obvious consistency under flexible constraints, and the simulation results are basically consistent with the experimental data. The experimental results show that it is feasible to use ANSYS to analyze the contact problem of thin-walled bearings under flexible constraints, which is in line with the actual situation of thin-walled bearings under stress and deformation. The results of finite element simulation calculations provide a reference for the lubrication, comprehensive mechanical properties and failure analysis of thin-walled rolling bearings and lay a foundation for further research on the thin-walled bearings’ elastic contact problems.
Numerical Simulation of Wind Changes after Turning at T-shaped Roadway Intersection
Authors: Lu Guangli , Zhao Jianfeng , Xing Feibiao , Wu Zanlong
Published: September 2020

Modeling and numerically simulating the intersection of semicircular arch and rectangular cross-section under different air inlet directions, studying the law of wind flow and the location of the average wind speed point, and providing a basis for the deployment of wind speed sensors. Through simulation, it is found that the influence of wind speed on wind flow change is very small. The law of wind flow change under different wind speeds is consistent, and the distance between the average wind speed point and the tunnel wall is also consistent. Along the direction of wind flow, the flow field near the roof and the side with larger air volume is relatively stable, which is suitable for the arrangement of wind speed sensors.
Numerical Simulation Study on the Laws of Smoke Backlayering of Fire in Level Roadway of Metal Mine
Authors: Tian Mengya , Lu Guangli , Liu Beibei , Zhao Jianfeng
Published: September 2020

In order to study the law of smoke backflow in the middle of a metal mine fire, the FDS fire simulation software was used and the actual mine was used as the research background to establish a model including the middle section and the ramp. Set 6 kinds of fire source power of 5MW, 10MW, 15MW, 20MW, 25MW and 30MW, 1m/s, 1.5m/s, 2m/s, 2.5m/s and 3m/s 5 kinds of mid-range wind speed and 5%, 10%, 15% and 18% slopes are used to study the development rule of flue gas counterflow under different conditions. The results of the study show that the reverse flow range of the smoke flow in the middle section of different fire source powers can reach 8~30m, and the wind speed in the middle section has a significant effect on the suppression of the reverse flow of the flue gas. At the time, the length of fire smoke counterflow gradually decreased.
Effect of Laser scanning speed on Wear Behavior of 45# Steel against Plant Abrasive
Authors: Huang Xiaopeng , Wan Fangxin , Li Wuqiang , Wu Jingfeng , Huang Jianlong
Published: September 2020

In this paper, the author studied the effect of laser quenching scan time on the wear resistance of 45# steel against plant abrasive by using alfalfa meal as a typical plant abrasive. The results showed that under the experimental conditions, the maximum surface hardness of the material can reach 735HV, and the maximum hardness of the material is between 0.5 and 0.8 mm from the surface; the wear resistance of 45# steel after laser quenching is much higher than that without laser; the higher hardness of the treated specimen, the better wear resistance; in comparison with the untreated specimen, the plow depth of the surface of the specimen after laser treatment is significantly shallower and narrower, and the degree of fatigue wear is also significantly smaller than untreated specimen.
Study on Acoustic Detection Method of Gas Pipeline Leakage
Authors: Zhao Yu , Ma Fan , Zhao Na , Ma Jian
Published: September 2020

Gas pipeline leakage will not only threaten people’s life and property, but also lead to serious environmental pollution and waste of resources. Based on the analysis and summary of domestic and foreign literature in recent years, the main causes of gas pipeline leakage are summarized, and the current main gas pipeline leakage detection methods are studied, hoping to provide certain reference for pipeline operation safety management.
Analysis on Electrochemical Impedance Spectroscopy of the Hydration Process of Cement-based Materials with a Large Amount of Mineral Admixture
Authors: Yang Zhuo , Huang Yineng , Zhu Lie , Xu Han , Yu Dingcheng , Hou Zhenkun
Published: September 2020

High-performance concrete with a large amount of mineral admixtures is more and more preferred by research scholars. The pozzolanic activity and chemical constituents of mineral admixture directly affect the secondary hydration reaction time, and ordinary microscopic test means cannot reflect the continuity of chemical reaction process. In this paper, slag, fly ash and silica fume were used as mineral admixture to explore the electrochemical impedance spectroscopy change of mixing amount and curing age of a large amount of mineral admixture on the hydration process of cement-based materials, and the influence of mineral admixture ratio on electrochemical impedance spectroscopy was studied, the research results showed that the secondary hydration reaction of fly ash mainly occurs at the age of 42d-60d, while the secondary hydration reaction of slag mainly occurs at the age of 21-42d. The micro-aggregate effect of fly ash plays a role in increasing the electrochemical impedance of the cement slurry from the early stage of mixing, while the slag increases the electrochemical impedance of cement slurry due to the secondary hydration reaction. This paper continuously tested the hydration process of fly ash, slag and silica fume on cement-based materials.
Study on optimization model of overseas oil and gas resources structure
Authors: Sun Yan , Zhu Xueqian , Qi Liming , Huang Shanming , Zhang Tao
Published: September 2020

Due to the unreasonable structure of overseas oil and gas resources and the lack of resource optimization strategy will seriously affect the stable development of oil companies in the global field, it is an urgent problem for oil companies to provide scientific and rapid optimization solutions to meet the resource allocation objectives for managers. In view of the lack of multi-stage dynamic planning model for overseas oil and gas resource structure optimization allocation, based on the operational research theory, according to the resource characteristics of overseas oil and gas projects, a dynamic programming mathematical model is established in this paper, which aims at the allocation of resource structure. It is solved by genetic algorithm, and realized by programming with MATLAB language. This study provides a new way and method for optimizing the allocation of overseas oil and gas resources.
Study on the relationship between internal heterogeneity of single sand body and remaining oil distribution in Pubei Oil Field
Authors: Xu Axian
Published: September 2020

According to the distribution characteristics of remaining oil in narrow thin sandstone reservoir of Pubei oilfield, the influence parameters such as sedimentary microfacies, structural morphology, effective thickness, rhythm, superposition relation, permeability and variation coefficient are selected, the relationship between Heterogeneous Composite Index and remaining oil distribution is studied by using analytic hierarchy process (AHP). The results show that the area where the heterogeneity index is larger is the main enrichment area of remaining oil. Based on the characteristics of injection and production of single sand body, the cause of remaining oil and the distribution of remaining oil potential, 6 sets of typical well groups and 19 kinds of single sand body injection and production potential countermeasures are optimized to provide a strong basis for fine injection and production of single sand body.
Study on the Control Effect of Sedimentation on Coalbed Methane in Daning-Jixian Area, Ordos Basin
Authors: Niu Haiqing , Han Xiaofeng , Chen Shiyue
Published: September 2020

Daning-jixian area is the main distribution area of Carboniferous-Permian coal-bearing rock series in eastern Ordos basin. the enrichment of coalbed methane in the study area is not only controlled by the modern characteristics of the structure, but also closely related to the buried-palaeogeothermal-hydrocarbon history of coal reservoirs under the control of tectonic evolution, which is an important kinetic factor for coalbed methane enrichment. The characteristics, lithology, lithofacies and spatial assemblages of coal-bearing rocks are controlled by the sedimentary environment, and the multigenerational reservoir-cap assemblage increases the thickness and sealing property of the caprock, so the depositional action is very large It controls the coal reservoir gas material base, reservoir cover combination characteristic and reservoir property, and affects the coal bed methane preservation through the combination relation between coal seam and surrounding rock.
Study on Geological Characteristics of Typical Shale Gas Reservoirs in China
Authors: Liu Qiang , Yao Shangsheng , Ma Lihui
Published: September 2020

shale gas is a kind of natural gas produced from a very low porosity and permeability, dark organic rich shale system. Compared with American shale, Chinese shale has a large amount of brittle minerals, with a brittleness coefficient of 46.15%, North America 38.27%, and China shale ratio as a whole Shale brittleness is better in America. This paper carefully analyzes the geological characteristics of typical shale gas reservoirs in China, analyzes the sedimentary environment and the distribution of organic shale, judges the characteristics of high-quality shale in the “dessert section”, and evaluates the organic pores as the important reservoir space and preservation conditions for shale gas enrichment. Compared with the geological conditions of shale gas reservoirs in North America, the burial depth of China’s marine shale is 1500-5000m, and the best recoverable area of China’s marine shale is located at the structural edge with developed fractures.
Technical Research on Hydrogen Supply Chain Industry
Authors: Xue Fangming , Su Jingcheng , Li Peipei
Published: September 2020

This article compares different types of hydrogen production technology, and it is not advisable to decide which hydrogen production method to use based solely on the production cost of the technology. It is also necessary to consider the local resource situation. The central and western regions are rich in hydropower and natural gas resources, and the prices are relatively low. The natural gas reforming hydrogen production plus distributed electrolysis water hydrogen production technology is a recoverable solution; there are many chemical and iron and steel enterprises in the eastern coast and the Bohai Rim region, and the industrial by-product hydrogen purification technology It is a better choice; there are abundant renewable resources such as photovoltaic and wind energy in Northeast, North China, and Northwest, and can use renewable energy electrolytic hydrogen production technology; Inner Mongolia, Shanxi, Shaanxi and other places have excellent coal resources, and the potential of coal hydrogen production technology is huge. The establishment of the layout of the downstream hydrogen refuelling station and the establishment of the application market are also crucial to the upstream hydrogen production enterprises. Areas where the front-end hydrogen production link and the back-end application link are well integrated can gain a favourable position.
Study on Comprehensive Adjustment Countermeasures of Weak Alkali ASP Flooding in Low Water Cut Period
Authors: Liu Wenjing
Published: September 2020

The problems occurred in the production process of weak alkali ASP flooding industrial demonstration area in Class II oil layer of Block A are systematically analyzed, such as the injection pressure of some injection wells rising too fast, the low energy and low yield of some production wells after ASP flooding, and the water cut rising too fast. Aiming at the problem of time, the research work of comprehensive adjustment was carried out, and the effective ways to improve the test effect were summarized Improve the injection-production relationship of well groups and reduce the plane and interlayer differences; Better development results have been achieved by improving the effectiveness of oil wells.
Continual monitoring technology of the natural ventilation pressure and its application countermeasures in coal mine
Authors: Tong Xiaozhang , Zhou Tao , Ye Chunhui , Yang Yang
Published: September 2020

In order to prevented the adverse effects of natural ventilation pressure vary in coal mines, the paper proposed a method to continual monitoring natural ventilation pressure vary, Dynamic grasp of natural ventilation pressure vary law. According to the relationship of mine ventilation energy, the method was calculated: to a stable ventilation system, meter water column vary Δx is linearly related to natural ventilation pressure vary ΔHN and air volume vary ΔQ. Using this method, the natural ventilation pressure vary in Panyi Mine was measured, the law of natural ventilation pressure vary in PanYi Coal Mine was as follows: The natural ventilation pressure vary periodically within one day, in abnormal weather, the range of natural ventilation pressure vary within one day reached 350Pa, and the range of fluctuation for mine air volume reached 3.2%. The article illustrated the case of local ventilation system instability caused by abnormal vary of natural ventilation pressures through examples, put forward countermeasures to deal with the vary of natural ventilation pressures. The application of continuous monitoring the natural ventilation pressure could quantitatively grasp the natural ventilation pressure vary in real time and provided a reliable basis for formulating the application countermeasures of the natural ventilation pressure vary.
Study on the method of step-up hydraulic fracturing infiltration for soft coal seam
Authors: Qiao Wei
Published: September 2020

In view of the dilemma of the current hydraulic fracturing effect of soft coal seams, based on the existing hydraulic fracturing technology, a model corresponding to the jump pressure and the length of fracture propagation during the stepwise hydraulic fracturing process was constructed, the influence of the elastic modulus of coal and rock mass and the step-up pressure on the crack extension length during crack propagation was analyzed, and a step-up hydraulic fracturing infiltration method suitable for soft coal seam was formed. The research results show that the coal seam has strong stress sensitivity, and in the step-by-step step-up fracturing process, the coal seam cracks expand as the energy potential increases step by step, and they always extend along the direction of the maximum principal stress. The effect of infiltration is very obvious. In the process of fracture propagation, the elastic modulus of coal and rock mass, and the pressure difference of gradual jump have a great influence on the length of fracture propagation, and the initial crack width and crack height have a certain effect on the effect of fracture expansion and infiltration of the gradual jump hydraulic fracturing. The newly proposed step-up hydraulic fracturing and infiltration method can effectively extend the soft coal seam rock mass gradually when the cracks are fully developed, and has a good application prospect.
Neural Network Production Split Model Based on Kriging Interpolation Method and Grey Correlation Analysis Method
Authors: Fu Juyao , Yu Gaoming
Published: September 2020

Oil well production split is an important prerequisite for the efficient development of multi-layered reservoir. Conventional split methods do not consider the synergistic influence of dynamic and static factors related to the oil layer with certain errors. Based on the related dynamic and static parameters of production wells and production data, a neural network split model considering Kriging interpolation and grey correlation method was established. Before the model is established, the involved data is first sorted, and Kriging interpolation is used to complete the data at the appropriate time. Then, the grey correlation analysis method is used to calculate the correlation of the dynamic and static parameters related to reservoir production, and the main parameters of it are extracted. The main parameters are treated as input and substituted into the double hidden layer neural network for modelling, and the resulting model is used to split the production of each layer of the oil well. This method is applied to the production well of the N block of the Y Oilfield. Compared with the conventional method, the accuracy is significantly improved, which is in line with the actual reservoir characteristics.
Numerical simulation research on the gob-side coal pillar width and surrounding rock deformation characteristics
Authors: Deng Ganbo
Published: September 2020

Taking the Gaohe Coal Mine working face gob-side in Shanxi as the research object, the FLAC3D numerical simulation software was used to construct a numerical calculation model to analyze the coal pillar width and the surrounding rock deformation characteristics of the working face gob-side in the mining face during the mining process. The width of the coal pillars along the gob-side was determined, and the change law of the surrounding rock stress and deformation of the roadway with the advancing face was obtained. The research shows that the reasonable coal pillar width along the gob-side in the working face of Gaohe coal mine shall not be less than 36m. With the advancement of the working face, the stress and deformation of the surrounding rock of the roadway gradually increase, and the deformation amount and deformation range of the coal gang are both greater than the corresponding value of the flexible form gang, and the vertical stress of the coal gang is less than the stress of the flexible form concrete gang. The difference in deformation is the main reason for the difference in stress. The results of the study provide a reference for the safety of the gob-side along the coal mine.