bluuebunny/crossref_metadata_2025 huggingface dataset:
Mathematical Research on Influencing Factors of Power Pipeline Entering the Gallery under the New Situation of Environmental Protection
Authors: Li Lingyun , Xu Yang , Guo Xinju , Zeng Ming
Published: February 2021

At present, with the acceleration of urbanization process in our country, the demand and construction of underground pipeline networks are increasing in cities, and higher requirements are placed on land pollution prevention and social environmental protection benefits. The comprehensive pipe gallery can not only beautify the urban landscape, ensure urban safety, improve urban functions, and promote urban intensive efficiency and transformation, but also avoid the land pollution caused by repeated excavation of road with high environmental benefits. As one of the many pipelines in the comprehensive pipeline gallery, the construction of the power pipeline will also help save land resources and meet environmental protection requirements. Therefore, it is important to study the influence factors of power pipelines entering the gallery.
Research and Application of Post Evaluation Method for Power Grid Technology Projects
Authors: Ji Yongshang , Li Wensheng , An Shuhuai , Yin Zhi , Qiu Jifu , Peng Bo , Li Yajin
Published: February 2021

With the development of refined power grid investment, power grid companies pay more attention to investment benefits and effects while taking into account reliability. However, in the practice of project evaluation, there are problems of “emphasis on results and neglect of transformation”, “emphasis on long-term and neglect on short-term”, poor objectivity and low accuracy of economic benefit evaluation. According to the characteristics of science and technology projects, the concept, scope and time scale of the post-evaluation of power grid science and technology projects are defined. On the basis of the existing State Grid Corporation’s project post-evaluation, an evaluation index and a mid- and long-term evaluation system were established to comprehensively evaluate the investment benefits of scientific and technological projects and improve the evaluation mechanism of current evaluation indicators. This paper also digs out the guiding indicators of evaluation, and takes the economic benefits of result transformation as an important evaluation indicator to guide project implementers to improve project quality during project implementation, thereby improving the efficiency and benefits of scientific research project investment.
Supplier performance evaluation for 500 kV main transformer
Authors: Jiang Yinghan , Dong Litong , Chen Yinghua , Ge Yanqin , Wang Mingxue , Zhang Jinliang
Published: February 2021

As an important state-owned energy backbone enterprise related to national energy security and the lifeline of national economy, power grid enterprises are responsible for ensuring the quality and safety of equipment and promoting the development of equipment quality. Therefore, continuously improving the quality evaluation of main transformer equipment is very important to improve the quality of power grid main transformer equipment. This paper first constructs the main transformer equipment quality evaluation index system from equipment procurement, equipment installation, equipment use and equipment decommissioning and scrapping; on this basis, the scoring method of each evaluation index is given, and the final main transformer equipment quality evaluation score is calculated by combining subjective and objective weight determination method; Finally, according to the evaluation of 500kV main transformer equipment of provincial power grid company price score, to evaluate the performance of equipment quality provided by suppliers.
Polythiophene/Carbon Microsphere Composite as a High-performance Cathode Material for Aluminium-ion Batteries
Authors: Kong Dongqing , Fan Haodong , Wang Xiaohui , Hu Haoyu , Li Bin , Wang Dandan , Tian Shuang , Gao Xiuli , Xing Wei
Published: February 2021

Due to the high theoretical volume specific capacity and mass specific capacity of aluminum-ion batteries, they can meet the needs of contemporary society for high-performance energy storage devices, and have attracted a lot of research strength. Cathode materials are a key issue limiting the development of aluminum-ion batteries. Herein, polythiophene was prepared on the surface of carbon microspheres by in-situ oxidative polymerization, resulting in polythiophene carbon microsphere composite materials. It exhibits excellent electrochemical performance, as a cathode material for aluminum-ion batteries, in terms of a high specific capacity (106 mAh g−1 at a current density of 1 A g−1), good stability (maintaining 58 % of initial capacity after 10000 cycles) and excellent rate performance (90 mAh g−1 at a high current density of 3.5 A g−1).
A fault recovery scheme cooperating with reclosing and LVRT for active distribution network
Authors: Li Qian , Chi Ruimin , Ma Lei , Song Dan , Yuan Sen
Published: February 2021

The integration of distributed generation brings great change to the operation mode of the distribution network, and higher requirements have also been set for the fault recovery scheme. Analysing the relationship between fault reclosing and voltage variation of the distributed generation in distribution network and considering the influence of reclosing on LVRT of DG, this paper proposes a new fault recovery scheme cooperating with reclosing and LVRT (low voltage ride through) for active distribution network. The planned isolated island area is divided in advance for each DG, and different fault recovery methods are implemented according to the different fault conditions of the fault location, the isolated island area and the voltage variation of the distributed generation. The feasibility and effectiveness of the proposed scheme are verified by simulation in PSCAD.
Current Status Analysis and Development Research on Energy Saving and Emission Reduction of Power System HVDC Power Supply
Authors: Gan Zining
Published: February 2021

The power system’s development is facing a substantial environmental bottleneck, and the key to solving this problem is energy-saving and emission reduction. Based on the environmental effects, firstly, the research results of energy-saving and emission reduction in different development stages of power system HVDC power supply are summarized. Our research found that in the traditional power grid stage, most scholars focused on the environmental cost of pollutants on the power generation side; in the development of the smart grid stage, the research included quantitative analysis of energy-saving and emission reduction, economic analysis, and comprehensive evaluation, and there were many results and shortcomings. Based on summarizing the current results, future research on power system energy saving and emission reduction based on environmental effects prospects, and the critical research contents of future smart grids, integrated energy systems, and energy Internet are discussed.
Cold Spray Repair of the Surface Coating on Д - 30 Engine Center Transmission Cartridge Receiver
Authors: Shi Zhongchuan
Published: February 2021

According to the wear and spalling of the aluminum bronze coating on the central transmission cartridge receiver surface of Д-30 engine magnesium alloy, the cold spraying process was used to carry out the process test and the casing coating repair. The results show that the cold spraying process can obtain better effect than plasma spraying in repairing aluminum and copper coatings.
Research on Optimal Strategy of Residential Buildings Energy Based on Standardized Euclidean Distance Measure Similarity Search Method
Authors: Ding Yifeng , Liang Anqi , Ma Kai , Li Gan , Wang Zhao , Ma Lin , Sun Qinfei , Yang Shuo
Published: February 2021

Aiming at the integrated energy optimization problem of residential buildings including production energy, energy storage and energy use objects, such as photovoltaic power generation, solar heat, electric heating, heat storage, battery, household power load and so on, this paper formulate the energy scheduling policy under the current running state referring to the scheduling policy of similar running state in history from the point of view of data mining. Firstly, a random matrix of basic status of residential buildings energy is constructed. Based on this, a similarity search method based on standardized Euclidean distance measure is proposed. This method forms four standardized Euclidean distances that are the solar irradiance vector, outdoor temperature vector, residential buildings’ electric load vector and heat load vector by the similarity measure calculation based on the standardized Euclidean distance model. The weight analysis method is used to uniformly process a standardized European distance comprehensive index as a measure of similarity. Then, the paper analyses the threshold setting principle of similarity measure. Finally, the optimization process of scheduling strategy of residential buildings energy based on similarity search method is given. A simulation example of an actual residential buildings under a typical scenario of sunny day in winter shows that the proposed similarity search method based on the standardized Euclidean distance measure can make full use of a large amount of historical operating data and speed up the optimization efficiency of optimal scheduling strategy for integrated buildings energy. The scheduling strategy can guide energy storage to play the role of energy transfer, and guide the electric heating equipment and the time-shifting electric load to work in the valley period through the peak and valley electricity prices, thereby the user’s bill is effectively reduced.
Low Temperature SCR Cost Evaluation in Solid Waste Incineration Power Plant
Authors: Yao Yao , Qian Wang
Published: February 2021

To meet the increasingly strict emission control requirement, low temperature selective catalytic reduction (SCR) system is adopted in some waste incineration power plant because of the limited denitrification capability of selective non-catalytic reduction (SNCR) system in boiler furnace. The article evaluated the increased cost per ton of waste when SCR system is equipped on a 2×400t/d waste incineration power plant in Henan province. The total cost of SCR system, including construction period and operation period, per ton of solid waste is about 37 yuan.
Research on the Whole Life Cycle Management of Environmental Protection and Energy Saving for New Green Buildings
Authors: Lin Qiyan
Published: February 2021

China’s construction industry accounts for a large proportion of energy consumption and has become one of the burdens of environmental protection. How to achieve environmental protection and energy conservation in the construction industry is also an important issue in the current construction industry. Green buildings have become an important measure for environmental protection and energy conservation in the construction industry. The main problems of the current development of buildings, based on the perspective of the whole life cycle, analyze the application analysis of the environmental protection and energy saving of green buildings in all stages of the whole life cycle, and propose the whole life cycle management application strategy for environmental protection and energy saving of green buildings to promote the environmental protection of new green buildings Energy-saving development.
Research on Advanced Application Configuration Design Technology of Smart Substation
Authors: Du Zhen’an , Wen Bo , Wang Qi , Li Hengxuan , Chen Ke , Zhang Kanjun , Xiao Fan , Wang Ting
Published: February 2021

The application transparency of secondary equipment in Smart Substation is low, the logical linkage is poor, and the intercommunication ability of equipment from different manufacturers is limited, which seriously restricts the promotion and application of advanced application functions. In view of the above problems, this paper carries out the research on advanced application configuration design technology of Smart substation, realizes automatic generation of advanced application logic through configuration configuration technology, realizes real-time display of logic status through configuration monitoring technology, and develops a measurement and control device supporting configuration design. The research results of this project are applied to a 110kV Smart substation in Hubei Province. The application results show that the technology described in this paper can effectively improve the application quality and efficiency of advanced application functions.
Analysis of Magnetic Coupling Resonance Efficiency of Superconducting Radio Power String Familiar with Magnetic Resonance
Authors: Chen Xuanmo , Liu Yizhi , Li Chenghan
Published: February 2021

This paper presents a superconducting wireless transmission system whose transmitting coil adopts superconducting material and receiving coil to adopt copper material which can solve the problem of transmission efficiency of wireless transmission system well. Firstly we analyze magnetic coupling resonant wireless transmission principle; then measure superconducting coil resistance and copper coil resistance calculate analyze system quality factor change with frequency. Finally experiment measurement of transmission efficiency of superconducting-copper magnetic coupling resonant wireless transmission system analyzes the relationship between transmission efficiency and axial offset and radial offset distance. Experimental results show that superconducting wireless transmission systems can improve transmission efficiency significantly compared with copper wireless transmission systems. Compared with copper wireless transmission systems, superconducting wireless transmission systems have at least 12.4% efficiency enhancement during axial offset, while at least 11.3% efficiency increases during radial migration. While short distance radial migration (1~4cm), superconducting wireless transmission systems have almost constant transmission efficiency. Provide some technical reference for Superconducting wireless transmission.
Research on All-Vanadium Redox Flow Battery Energy Storage Device Based on Energy-Saving and Environmentally-Friendly New Energy Power Station Interface Technology
Authors: Wang Yanan
Published: February 2021

In the context of energy conservation and environmental protection, new wind energy power generation has obvious random, intermittent, uncontrollable and anti-peak-shaving characteristics. The large-scale grid connection of wind power has brought grid peaking and stable and safe operation the huge pressure has caused more serious wind curtailment and power rationing, which has seriously affected the effective use of wind resources and economic benefits. Under the dispatch of the energy management system, the all-vanadium redox flow battery energy storage power station smooths the output power of wind power generation, and cooperates with the wind farm power forecast system to improve the wind farm tracking planned power generation capacity and improve the grid-connected power quality of the wind farm. Based on this, the thesis studied the external operating characteristics of the all-vanadium flow battery (VFB) energy storage system, and carried out the modeling and simulation of the energy storage system (ESS) based on the electrochemical properties of the VFB. Systematically analyse the actual operating data of the energy storage system and evaluate the impact of its overload operation on dispatch control, and fit key parameters such as state of charge (SOC), electromotive force and equivalent resistance, and obtain functional relationships.
Research on the law and characteristics of gas products during coal heating and oxidation
Authors: Qin Muguang
Published: February 2021

In order to explore the comprehensive indicator gas indicators suitable for the fire prevention and extinguishing work of Chaohua Coal Mine 22012 working face, the gas product law during the heating and oxidation process of coal in the 22012 working face was experimentally studied by using the coal spontaneous combustion gas product simulation test device. The index system for predicting and forecasting the indicator gas of coal spontaneous combustion in 22012 working face was obtained. The research results show that: CO can be used as an index gas for predicting and predicting coal spontaneous combustion, and olefin gas C2H4 can be used as a marker gas for predicting and predicting spontaneous combustion of coal, and the predicted critical temperature of C2H4 is about 110°C. C2H4/C3H8 can be used as an auxiliary indicator for judging the spontaneous combustion process of coal, and the law of ratio change can only be applied after the C2H4 and C3H8 gases appear at the same time. C2H2 and the alkane ratio C2H6/CH4, C3H8/CH4, C3H8/C2H6 are not used as the indicator gas indicators for prediction and prediction of coal spontaneous combustion at Chaohua Coal Mine 22012 working face.
Drivers of Water Resources Carrying Capacity and Changes due to Climate Change in China
Authors: Wang Yifan
Published: February 2021

With basic knowledge of global sustainable development, water resources carrying capacity (WRCC) relates closely to society, economy and environment. It has important affection on the knowledge and construction of water resources security system. Based on most updated international and national research outcomes on drivers of WRCC and future changes due to climate change, this paper collects and summarizes the theory and drivers of WRCC, as well as water resources and sustainable development, water sources-society-environment coupling system and trends of water cycle in a changing climate representing by the drivers of WRCC. With an overall understanding of water sources carrying capacity, this paper analyzes the evaluation methods of WRCC study, including the system dynamics theory, the decision model with multiple factors and so on. Finally, this paper concludes the current problems of water resources representing by WRCC.
Implement quality control of roadbed pressure in highway engineering
Authors: Lei Puchun
Published: February 2021

In daily life, highways are the most common public facilities and are closely related to people’s travel. Therefore, various management departments must pay attention to strictly supervise the quality of each construction link of highway engineering, especially in accordance with the requirements of relevant standards, do a good job of quality control of highway subgrade compaction. This article first analyzes the factors affecting the quality of roadbed pressure in highway engineering, and proposes targeted quality control measures, hoping to provide a reference for the improvement of my country’s highway engineering construction quality.
Au@Gqds@Ptxbi Nano-Dendrites Endows Alkaline Methanol Highly Electro-Catalytic Activity and Stability
Authors: Li Jinling , Zhang Qiankun , Shao Tao , Zhang Dongxia , Zhou Xibin
Published: February 2021

In this work, we put forward a simple and green strategy to design and synthetic a highly efficient Au@GQDs@Pt3.5Bi nano-catalyst with a novel nanostructure composed of an Au@GQDs core and Pt3.5Bi alloy shell. This material showed outstanding catalytic capability for the oxidation of methanol (MOR) than that of the commercial Pt/C catalyst. The sequence of the mass activity was arranged to be commercial Pt/C (0.29 A mgPt−1) < Au@Pt3.5Bi (1.6 A mgPt−1) < Au@GQDs@Pt (1.81 A mgPt−1) < Au@GQDs@Pt3.5Bi (17.45 A mgPt−1). The outcomes ascribed to the unique core-shell structure with dendrites, interior electronic and synergistic effect with Bi and Pt. This work enlightens on the delicate proposal of novel core-shell nano-material for improving the electro-catalytic performance of MOR.
Research of complex fracture acid fracturing technology in low permeability carbonate reservoir
Authors: Zhang Xudong , Zhou Jun , Yao Yiming , Wang Jianqing , Wang Dong
Published: February 2021

Based on the analysis of the characteristics of the low-permeability carbonate reservoir, this paper has carried out studies on the adaptability of geological conditions, the adaptability of rock mechanics conditions and the characteristics of horizontal stress of the reservoir, etc., and demonstrated the feasibility of the acid fracturing of the low-permeability carbonate reservoir with complex fractures. In view of the poor connectivity of low-permeability carbonate reservoirs and the unsatisfactory effect of conventional acid fracturing, a “large scale + high pump rate” process idea of complex fracture acid fracturing technology was formed through the simulation of process parameters and optimization of construction pipe string, so as to expand the reservoir stimulation volume and improve the communication scope.
Support vector machine is used to establish the oil production model of polymer flooding in the Class-II reservoir
Authors: Chen Kai
Published: February 2021

According to the problems of different oil production curves, complex influencing factors and difficult production prediction in different blocks of the Class-II Reservoirs in D Oilfield, a staged oil production prediction model is established according to the corresponding relationship between the advancing theory of polymer flooding wall and the dynamic change characteristics of oil production. In the process of solving the model, by introducing the support vector machine method, Twenty-eight groups of model parameters and influencing factors in the developed blocks are selected for learning and training, and six groups of data samples are tested for prediction. Finally, the nonlinear fitting relationship between the model parameters and influencing factors is determined, and the whole algorithm process is compiled into a simple application program. The field application shows that the prediction accuracy of the new model is over 95%, which is convenient for tracking and debugging, and can fully meet the requirements of compiling the polymer flooding development scheme of the Class-II reservoir and the medium-and long-term planning scheme of the oilfield.
Construction and application of gas emission feature outburst early warning system in working face
Authors: Deng Ganbo
Published: February 2021

In order to realize the accurate early warning of coal and gas outburst in Xinyuan Coal Mine, the early warning system of coal and gas outburst based on the dynamic characteristics of gas emission is constructed by using the dynamic characteristics of gas emission. The results show that the outburst early warning system based on the characteristics of gas emission can realize the real-time and dynamic early warning of the outburst danger of the working face of Xinyuan Mine, and the early warning accuracy is up to 79%, which ensures the daily safety production of Xinyuan Mine.
A Model for the Deposition of Scale Crystals on the Surface of Clay Particles
Authors: Yu Tao , Song Jiayu , Yan Yan , Wu Baichun , Qu Chengtun
Published: February 2021

Deposition and aggregation of scale on microbial surface leads to poor stabilization of the treatment of oilfield high-scale oily wastewater. To study the deposition characteristics of scale on the surface of microbial particles, we perform the deposition and aggregation of calcium sulfate on the surface of clay particles as simulators of microbes and establish the deposition-aggregation process model. According to the theory of crystal growth, the diffuse electric double layer theory for clay, and the charged colloid theory, the scale deposition model can be divided into induction period, formative period of scale crystal nucleation, and crystal growth period. When calcium sulfate crystals deposit and aggregate on the surface of clay particles, the zeta potential and the average particle size on the surface of the clay particles increase continuously over time and tend to increase and decrease in cycles. The scale crystals are wrapped divergently around the surface of the clay particles in a needle-like form, such that the clay suspension is in a state of high aggregation. Logarithmic value of the conductivity in the formation of scale crystal has a good linear relationship with time, which conforms to the first-order rate equation. Conductivity curves can better reflect the deposition course of scale crystal on the surface of clay particles, which is divided into the induction period (6 min), transition period (1.5 min), formative period of scale crystal nucleation (10.75 min), rapid growth period of scale crystal (8.5 min), slow growth period of scale crystal (14.75 min), and stationary phase (4.75 min), and with the formation of the scale crystal, the deposition rate constant decreases gradually from 0.00945 min−1 to 0.0001 min−1. The results uncovered that Deposition and aggregation rules of scale on the surface of clay particles and the basis for further studying on microbial surface.
Research Progress of Structural Health Monitoring Based on BIM Technology
Authors: Zhou Meiyu , Zhao Peng , Ren Hongwei , Shi Fengjiao , Feng Hao , Qin Lei
Published: February 2021

Structural health monitoring technology is one of the effective means to ensure the reliability of the structure, it is of great significance to the subsequent operation and maintenance of the structure to detect and identify the deterioration and damage of the structure during the service period, and realize the early warning and dynamic evaluation of the structural safety. Under the background of the rapid development of computer and other information technology, BIM technology is increasingly used in the field of structural health monitoring because of its good coordination, simulation, optimization, visualization, and graphing characteristics. This paper expounds and analyzes the research and application of structural health monitoring technology, BIM technology and structural health monitoring system based on BIM technology, and points out the technical and application problems that need to be solved urgently in the development of this field.
Research on the Effect of Uneven Proppant Settlement on Well Productivity in Stimulated Reservoir
Authors: Hou Tengfei , Cheng Changkun , Qiao Yan , Wan Youyu , Xiong Tingsong , Liu Shiduo , Zhang Yang , Ye Yu , Guo Bin , Wang Guoqing , Xie Guiqi , Liu Youming
Published: February 2021

The characteristics of proppant tarnsportation, settlement and distribution in fractures are of great significance to the effectiveness of complex fractures, as well to investigate the shale reservoir stimulation volume and productivity evaluation. This paper studies the effect of the uneven distribution of proppant sand banks on well productivity. A numerical model that comprehensively considers adsorption, desorption and stress sensitivity, and characterizes different settlement degree of proppant sand banks is established. The pressure distribution and productivity characteristics of fractured reservoir considering proppant non-uniform distribution are studied, by comparative analysis of different sand bank shapes, main fracture conductivity, reservoir matrix permeability and other sensitivity parameters. Meanwhile, the main controlling factor that affects the productivity of horizontal wells after the formation of sand banks are obtained. The results show that the proppant settlement greatly reduces the productivity. The effect of fracture conductivity on well production could ignore when the fracture conductivity is more than 4 μm2·cm in specific fractured reservoir. It is recommended to use small particle size proppant (100 mesh) to propped natural fractures or induce fractures. The higher the matrix permeability, the greater the impact of proppant settlement on well productivity. Beisdes, the measurement to prevent proppant settlement should be taken in high permeability zones. Considering the influence of proppant uneven settlement in complex fractures is of great significance for evaluating well productivity and guiding on-site fracturing operations.
Study on Well Selection and Layer Selection for Fracturing Production in Extended Well Area of Block A
Authors: Xu Guoqing
Published: February 2021

Fracturing reform plays an important role in improving the development effect of peripheral low permeability reservoirs, and fracturing put into production is the key to ensure the completion of productivity tasks at the initial stage of production. In 2012, an oilfield expanded drilling in Block A with good reservoir physical properties. In order to ensure the initial productivity, compare the fracturing production effect of the production well areas and the problems in the development process, and optimize the fracturing production well layers in the expanded well areas in combination with the geological conditions of the well areas themselves.
Analysis of Velocity dispersion and Attenuation in Double-scale Model
Authors: Zhou Dan , Sun Zhentao
Published: February 2021

In the two states of oil-gas and water-gas, the wave velocity and attenuation coefficient are numerically simulated by double-scale model. The P-wave velocity and attenuation coefficient curves show double-step and double-peak, respectively. With the increase of gas saturation, the velocity step of mesoscopic scale gradually decreases and disappears. The attenuation peak decreases and the characteristic frequency shifts to high frequency until it coincides with the characteristic frequency of the micro-scale. The superposition of the attenuation peak makes the total attenuation peak increase. And there is a great difference in fluid properties when oil, gas and water are mixed in the reservoir, so the double-scale model can better predict the fluid saturation in the reservoir and better monitor the fluid.
Discussion on the factors affecting the pump efficiency of screw pump
Authors: Fan Dongkai
Published: February 2021

Since the invention of screw pump in 1930, screw pump technology has been continuously improved and perfected, especially the development of synthetic rubber technology and bonding technology, which has made screw pump widely used in oil exploitation. Screw pump wells have the characteristics of low investment, high pump efficiency and energy saving. At present, screw pump has become a common artificial lifting method in oil fields using polymer flooding. In view of the present situation that screw pump wells are used for oil production more and more in Liuchang area, this paper discusses how to improve the production efficiency of screw pump wells in field production to promote the development of oil fields.
Characteristics of Chang 7 shale in Qingyang area, Ordos Basin
Authors: Li Zhenhua , Cao Feng , Zhang Suya
Published: February 2021

Chang-7 shale is the most important source rock of Mesozoic in Ordos Basin. The characteristics of Chang 7 shale in Longdong area of Ordos Basin are analyzed from the aspects of shale thickness, distribution, sedimentation, petrology and organic geochemistry. The results show that the shale in the study area is mainly distributed in the middle and lower part of Chang-7 member. The shale is mainly composed of deep lake and semi deep lake facies, with a thickness of 10m-40m and good horizontal continuity. The lithofacies are mainly black shale facies, laminated mudstone facies and silty mudstone or silty mudstone facies. The organic matter abundance is high, and the types of organic matter are mainly type I and type II, and they are in the mature evolution stage It has good oil-bearing property. In tight oil accumulation, shale is not only an important material source, but also provides an important reservoir forming power. Only with the existence of shale, can oil form industrial reservoir.
Fine numerical simulation of deep carbonate gas reservoir in northwest Sichuan
Authors: Liu Yicheng , Gong Yufeng , Wang Junjie , Lan XueMei , Zhang Lianjin , Liu linqing
Published: February 2021

Qixia Formation in northwest Sichuan has a complex structure, ultra-deep burial, high temperature and high pressure, thin reservoir and fractures development, and it is difficult to simulate the gas reservoir numerically. Based on existing geological understanding, in this paper, the tracking attribute parameters of three-dimensional seismic data bodies are optimized by ant tracking technology. Through the automatic extraction crack system of differential bodies, a three-dimensional geological model considering natural fractures is established. Using embedded discrete cracks and MRST numerical simulation open-source program, a numerical simulator of deep carbonate gas reservoirs in northwest Sichuan has been formed, and the development mechanism of Qixia Formation in northwest Sichuan is demonstrated. The research work in this paper has a certain theoretical guiding significance for the efficient development of deep carbonate gas reservoirs in northwest Sichuan.
Characteristics of paleogeothermal field and its influence on hydrocarbon accumulation in Qingyang area
Authors: Li Zhenhua , Zhang Suya
Published: February 2021

Geothermal field has an important influence on hydrocarbon accumulation. The geotemperature field in Qingyang area is studied by vitrinite reflectance and homogenization temperature of inclusions. The results show that the average geothermal gradient in Qingyang area is about 2.8 °C/100M, which is close to the median value of global average heat flow. It belongs to the medium temperature type geothermal field. In Qingyang area, the geothermal gradient is low from Paleozoic to early Cenozoic, ranging from 2.2 °C to 3.0 °C/100M, rising to 3.3-4.3 °C/100m in the late Mesozoic, and gradually decreasing to 2.8 °C/100M since Cenozoic. Generally speaking, high temperature field is favorable to the formation of petroleum system, and vice versa.
Research on Formation Prediction Model of Gas Hydrate
Authors: Lin Jianwei
Published: February 2021

In the process of gas extraction, gathering and transportation, etc., the formation of hydrates will cause blockage of mining facilities and pipelines and affect normal production, and even there are hidden dangers, causing difficulties in gas development. Therefore, the building of the hydrate prediction model is an urgent problem to be solved in the prevention and control of hydrate; it plays an important role in accurately and efficiently predicting the specific position and time of hydrate formation. In this paper, The formation mechanism and conditions of gas hydrate were described, and the prediction models of hydrate were introduced from two aspects: whether there are inhibitors (alcohols and electrolytes) in the hydrate system, respectively, the VdW-P model, a series of thermodynamic models based on it, and Chen Guo model based on hydrate dynamics were mainly described. Under different application conditions, the appropriate prediction model can effectively predict the formation of hydrate.
Analysis of Diagnostic Fracture Injection Tests for Shale Gas Wells
Authors: Chen Man , Jiang Xuemei , Zhang Jing , Gao Shangjun , Feng Xingzheng , Yang Hai
Published: February 2021

Formation pressure estimation of shale gas wells is one of the key factors affecting production prediction of gas wells, and diagnostic fracture injection test analysis is an important means to accurately obtain formation pressure parameters. In this paper, through the establishment of shale gas well diagnostic fracture injection test model, taking ChangNing shale gas field as an example, the actual test data of pre-production gas wells are fitted. Then analysis the change law of pressure transient curves and the model fitting results with conventional analysis method comparing with the results - G function diagnosis curve method to explain, optimizing fracture closure point selection mode, this paper proposes a new method to determine fracture closure point: when G derivative curve begins to deviate from the initial linear trend, correct selection of closed point, to obtain accurate formation pressure coefficient, formation pore pressure of reservoir parameters such as reservoir. At the same time, the improved method is used to evaluate the reservoir parameters of the actual gas wells in ChangNing, providing theoretical guidance for the subsequent fracturing construction and production.
Current status and prospects of coal and gas outburst prediction and prevention technology
Authors: Deng Ganbo
Published: February 2021

Predicting the sensitivity index accurately is an important prerequisite for the current status and future development of coal and gas outburst prediction technology. Technical operators and researchers must briefly analyze the traditional coal and gas outburst prediction and prediction methods. On this basis, optimization techniques and analysis methods, including mathematical and physical theories, databases, data mining and other information technologies, GIS technology, three-dimensional geological simulation technology, radio wave perspective detection technology, etc., can ensure the better development of this work. Different technical methods can be configured in combination with different usage scenarios to ensure satisfactory usage effects.
Characteristics of rock damage variable under cyclic loading
Authors: Wu Yunfeng
Published: February 2021

In order to study the mechanical characteristics of rock under dynamic load, shock and P-wave velocities were measured by split Hopkinson (SHPB) testing system and NM-4b non-metallic ultrasonic testing analyser. In the test, the specimens were subjected to single impact with different air pressure and cyclic impact with the same air pressure. Acoustic velocity was measured before and after impact to observe the morphological characteristics of rock samples after impact. The results show that: under different air pressure, the rock fracture morphology is closely related to the air pressure. The higher the air pressure, the greater the peak strength of the sample, the more concentrated the damage range to the center of the sample; The results show that the peak stress decreases, the cumulative damage increases and the wave velocity decreases with the increase of cyclic impact times.
Steady dynamic buckle propagation simulation of confined pipelines under external pressure by user defined elements in ABAQUS
Authors: Yan Sunting , Ling Zhangwei , Chen Yonggui , Jin Zhijiang
Published: February 2021

This paper simulates steady dynamic buckle propagation of confined linearly elastic pipelines under external pressure by developing a user-defined-element in Abaqus allowing the simulation of dynamic propagation through conventional static step. The simulation is separated into two parts: the static indenting step to deform a pipeline locally and the steady dynamic propagation step to obtain the relationship between the deformation profile and propagation speed.
Analysis on pollution prevention and control of waste lead battery recycling process
Authors: Wei Mengxiao , Ma Jun , Gao Tao
Published: February 2021

From the perspective of recycling, waste lead-acid batteries have very objective utilization value. However, from the perspective of environmental protection, waste lead-acid batteries contain many pollutants, which will cause serious pollution and damage to the environment if not handled properly. Containing lead, not only has a very high collection value, also is likely to lead pollution and poisoning accidents caused by improper operation, cause a threat to people’s life and health, therefore, this text set about from the pollution source analysis, through the way of recycling and pollution prevention and control technology were analyzed, and aims to take certain measures to protect the environment, protect health.
Analysis and Research on the Value of Farmland Transfer Based on Environmental Protection Evaluation System
Authors: Zhang Zhenyu , Tian Minghua , Li Jianjun , Wang Fang , Ma Shuang
Published: February 2021

In order to coordinate the farmland transfer and the construction of the ecological environment, this paper first introduces the main work content and the main benefits of farmland transfer, and then separately elaborates the land leveling, farmland water conservancy, field roads and other projects in the process of farmland transfer. Value analysis of the impact on the ecological environment of farmland, and analysis of the problems existing in the value of farmland transfer: neglect of ecological environment protection, unreasonable arrangement planning and construction technology, lack of specific normative guidance for protecting the ecological environment during the arrangement process. The results of the study show that the evaluation of the ecological value of farmland can be used to guide the rational external transfer of farmland, which is beneficial to the protection of farmland. At the same time, it also has certain guiding significance for returning farmland to forests and lakes. Therefore, it is necessary to evaluate the ecological value of farmland.
Research on Pipe Jacking Construction Technology Based on Upcrossing Metro and Cable Tunnel
Authors: Wang Qiang , Liu Zong , Yang Guangwu , Wang Haoliang
Published: February 2021

Based on the sewage pipeline defect repair project of Shizuo Road, Baiyun District, Guangzhou City, this article uses traditional technology to repair the basic pipelines of the old and new urban areas and the environmental conditions of the construction section. The pipe jacking construction in the trenchless repair is used to cross the subway and the construction pipeline. The complicated construction technology of the cable tunnel is discussed. Using the Peck empirical formula to estimate the ground settlement and its deformation pressure on the surrounding tunnels, the maximum deformation of the tunnel pipeline in the soil disturbance area during the construction process of the project is 0.80mm, and the maximum deformation of the subway tunnel is 1.42mm, which accurately reflects the roof The impact of pipe construction on the soil of surrounding tunnels. And study the disturbance influence of the two soil stabilization technologies of high pressure jet grouting pile and work well top-down construction method on the surrounding soil during the construction process, minimize the disturbance influence of the pipe jacking construction method on the surrounding soil, and ensure the construction quality and safety of the site.
Experimental Study on a Target Direction Finding Algorithm for Gas Leakage Detection in Underwater Structures
Authors: Na Jiesi , Yue Lei , Zhuang Rui , Yang Chong
Published: February 2021

Aiming at the application scenarios of underwater structure gas leakage detection in marine oil and gas development process, the power spectrum characteristics of underwater structure gas leakage radiation noise are analyzed. An new target direction finding algorithm is proposed, and the gas leakage detection-finding software is designed. Then, the test platform is built to complete the experimental study of underwater structure gas leak detection. The test results show that the new target direction finding algorithm used in this paper is compared with the conventional beam forming algorithm. The difference between the maximum beam energy value and the sub-maximum value is bigger, indicates that the target’s resolving power is strong, which effectively improves the detection capability of gas leakage targets in underwater structures.
Monitoring of plankton diversity in Dianchi Lake by environmental DNA technology
Authors: He Liwei , Zhang Lijuan , Yang Jianghua , Zhao Zheng , Zhou Xiaohua , Feng Qing , Zhang Xiaowei , Xu Shan
Published: February 2021

Surveys of zooplankter and phytoplankton through environmental DNA (eDNA) and metagenomic technology across Dianchi Lake and the estuary of inflowing rivers was conducted, to evaluate the microbial diversity of Dianchi Lake and the estuary of four in flowing rivers. Diversity of plankton and the similarity of dominant species results revealed that the dominant eukaryotic phytoplankton in Dianchi Lake was Bacillatiophyta. The Shannon diversity index values of phytoplankton and zooplankton ranged from 3.68 to 18.36 and 0.54 to 2.49, respectively. The main genus taxa in the Dianchi Lake were similar with the inflowing river. The distribution map of Shannon diversity index gave overall insight into the variation of plankton diversity. The research proved that the eDNA technology was effective in biodiversity monitoring in aquatic ecosystem, and the inflowing river may impose an adverse influence on the ecosystem health of Dianchi Lake.
Research on the Temporal and Spatial Characteristics of Ecological Civilization Attention Based On Baidu Index
Authors: Zhang Xuan
Published: February 2021

Ecological civilization is China’s millennium project, is the crucial point to build a beautiful China. With “ecological civilization” as a crucial word, through the analysis of the public attention of 31 provinces (cities and districts) in China from 2011 to 2020, the paper analyzes the changes of the domestic attention to “ecological civilization” from the two dimensions of time and space combined with the coefficient of variation, and studies the influencing factors of the search attention to ecological civilization by means of geographical detectors. Conclusion: 1) Public attention is highly sensitive to policies and relevant punishment measures for ecological civilization with the nature of encouragement and protection and pays high attention to them. The media index shows an inverted “V” type change, which indicates that the media pay less attention to the ecological civilization in the early stage and lack of continuous attention to it in the later stage. 2) On the whole, the spatial characteristics of ecological civilization attention are more in the east and less in the west, and more in the north and less in the south. Since 2015, the spatial difference of search index has become smaller and its geographical distribution is more balanced, but the problem of regional differentiation and alienation still exists for a long time. 3) PC products in the early stage, as the main means for people to understand ecological civilization, played an important role in the popularization of ecological civilization. Mobile terminals in the later stage should be taken as key publicity objects to play a greater role in publicity and education. 4) Economic, infrastructure and other factors have a great impact on the attention paid to ecological civilization construction.
Study on Methane Emission Factor of Paddy Fields in Hubei Province
Authors: Jiang Yinhua , Zhang Hui , He Jiajun , Huan Ping
Published: February 2021

Methane is one of the most important greenhouse gases, contributing about 15% of global warming, and agricultural activity is the largest source of methane, accounting for 50.15% of the country’s total emissions. Accurate estimation of methane emission factors in paddy fields is of great significance to the statistics of agricultural greenhouse gas emissions and the implementation of relevant emission reduction measures. According to the method recommended by IPCC, the average methane emission factor of single season rice is 470 kg/hm2, the average emission factor of fresh rice is 330 kg/hm2, the average methane emission from late rice is Factor of 220 kg/hm2.The factors that affect the methane emission in paddy fields in Hubei Province are mainly water management measures and soil environment.