bluuebunny/crossref_metadata_2025 huggingface dataset:
System Dynamics Simulation of Environmental Resources in Yinchuan Plain
Authors: Piao Hao , Duan Hanming , Zhu Miaomiao
Published: November 2019

Based on geospatial analysis, this paper studies the relationship between social systems and ecosystems in Yinchuan Plain through the analysis of environmental and resource indicators. Firstly, the ecosystem system configuration model was optimized based on system dynamics (SD). Secondly, different development strategies were analysed through Vensim PLE combined with scenario simulation. Lastly, the environmental impact factors such as air quality, SO2, wastewater, solid waste, energy consumption per unit output value, expenditure for environmental protection and green coverage rate in built-up area, etc were studied. In summary, this paper provides a theoretical basis and realistic basis for the sustainable development of the Yinchuan Plain.
Research on the development and utilization mode of mine water resources
Authors: Zhang Nan , He Hongmou , Guo Xinwei , Li Shu , Ni Shenhai , Peng Yuejin
Published: November 2019

China’s mine water comprehensive utilization rate is low. The main reason for the increase in the utilization rate after 2015 is the reduction in coal production. The shutdown of a large number of coal mines by capacity has objectively led to a reduction in mine water volume. Based on the development and utilization of mine water, this paper clarifies the characteristics of mine water utilization mode, and discusses the classification of mine water utilization mode and suggestions for safeguard measures in terms of mine water utilization targets and treatment difficult. The research undertook in this paper will expand the utilization of mine water and improve the utilization rate of mine water. It will help enterprises realize the transformation of mine water into waste and realize the value-added effect of mine water. It is desirable for the unconventional water resources will be integrated into the water source. It can help ease the contradiction between water supply and demand in water shortage areas and improve the efficiency and utilization efficiency of regional water resources allocation.
Historical reconstruction of anthropogenic lead pollution in Lake Yangzong, Yunnan province, southwest China
Authors: Zhang Yang , Zhang Hucai
Published: November 2019

Lake Yangzong, one of nine lakes in Yunnan Province, has experienced both steady and instantaneous inputs of heavy metals during the past several decades. During this study, the chronology of lead (Pb) pollution was analyzed by extracting a 60 cm long sediment core from the center of the lake, dating the sediments using 120Pb and 137Cs methods and analyzing the sediments for lead concentrations. The atmospheric deposition of Pb was predominately related to coal and ore consumption from a nearby aluminum manufacturer and thermal power plant and it may be considered non-point source pollutants. Combining the results of Pb isotopic compositions and Pb concentration and Igeo value, we deduced that the anthropogenic Pb was primarily be attributed to regional emissions from non-ferrous metal production industries.
Research on the Development of Integration of Neuroscience and Artificial Intelligence
Authors: Wu Yue
Published: November 2019

Since the birth of the subject of artificial intelligence, the long-term goal of this subject is to realize the intelligent system of human level. However, after nearly 60 years of development, no general intelligent system has been able to approach the level of human beings: it has the ability to cooperate with a variety of different cognitive abilities; it has a strong adaptive ability to complex environments; it has the ability of self-learning to new things and new environments. With the development of Brain and Neuroscience and Cognitive Science, it is possible to observe some activities of Brain Neural Networks under various cognitive tasks at different scales and obtain relevant data. Therefore, inspired by brain working mechanism, the development of Brain-like Intelligence has become a hotspot in the field of Artificial Intelligence and Computational Science in recent years. Machine Intelligence Brain-like Intelligence System (MIBS) inspired by cognitive behavior mechanism and realized by hardware and software cooperation is similar to human beings in information processing mechanism, cognitive behavior and intelligence level. The goal is to enable machines to realize various human cognitive abilities and their coordination mechanism, and ultimately reach or surpass the level of human intelligence. In this paper, we will study from the perspective of brain science, cognitive science and artificial intelligence. This paper reviews the history, current situation and research focus of brain-like intelligence research, and looks forward to its development direction, potential application fields and potential far-reaching impact.
Studies of Deformation Properties of Collapsible Loess Foundation under Overburden Pressure with Large Thickness by Centrifugal Model Test
Authors: Jin Songli , Xing Yichuan , Yan Jun , Zhao Weiquan , Zhou Shu , Xiao Jianzhang , Wu Shuaifeng , Sun Liming
Published: November 2019

At present, laboratory test and field immersion test are the primary methods to study the collapsibility characteristics of loess foundation. However, the stress state of laboratory test usually does not conform to the actual in-site situation, while the field immersion tests are expensive and difficult to operate. Thus, a new economical and efficient method which can reflect the actual engineering is urgently needed. Centrifugal model test, which is the best physical model test, has been extensively used in various fields of geotechnical engineering. However, centrifugal model test is seldom used in the simulation of collapsibility characteristics of loess foundation. In this paper, centrifugal model tests of natural water content foundation and saturated foundation are carried out for the collapsible loess with strong self-weight collapsibility located in Yili Region in Xinjiang, China. The collapsible deformation of loess foundation based on double-line method is obtained. The results show that the amount of foundation collapsibility simulated by low head saturation method is the closest to that of field immersion test, which verifies the feasibility of using centrifugal model test to simulate collapsible deformation of Loess foundation.
Research on Multi-level Protection Technology Based on ZGF-100(A) Ultra-high Pressure Hydraulic Drilling and Cutting Integrated Device
Authors: Lu Zhanjin
Published: November 2019

In order to ensure the safety of hydraulic transmission and slitting operation under ultra-high pressure, the composition of ZGF-100(A) ultra-high pressure hydraulic drilling and cutting integrated device, the main technical parameters of the complete set and the main technical indexes are described. ZGF-100 Based on the (A) type of ultra-high pressure hydraulic drilling and cutting integrated device, it is protected from the protection of ultra-high pressure water source, the protection of ultra-high pressure water transmission channel, the connection protection of key components of ultra-high pressure hydraulic transmission and the specification of ultra-high pressure hydraulic cutting operation. Ultra-high pressure hydraulic slitting multi-stage protection technology was studied. The equipment safety laboratory experiment was carried out. Under the experimental conditions of test pressure 120 MPa and pressure retention for 30 min, there was no leakage between the slash shallow spiral integral drill pipe, the ultra-high pressure rotary water tail and the ultra-high pressure hydraulic hose. The ground test of safety performance of complete sets of equipment was carried out. Under the conditions of experimental pressure of 100 MPa and duration of 30 min, no leakage occurred in all parts of the ultra-high pressure pipeline system, which was safe and reliable. After adopting the multi-stage hydraulic secant multi-level protection technology, the safety of the complete set of equipment is effectively improved, the safety of the ultra-high pressure hydraulic slitting operation can be effectively ensured, the occurrence of the accident of the ultra-high pressure water injury is prevented, and the operator’s personal life is guaranteed. Safety reflects good social benefits.
Seepage analysis of clay core wall dam based on ABAQUS
Authors: Li Hanyu , Zhao Fengyao , Li Junjie
Published: November 2019

The seepage analysis of earth-rock dams is required to define the seepage field as a community of saturated and unsaturated regions. The two complement each other. The motion characteristics of unsaturated seepage are relatively complex, and the influence factors are more than saturated seepage. In this paper, combined with engineering examples, the finite element numerical simulation is used to simulate the variation of the seepage field of the earth-rock dam in saturated and unsaturated seepage, and the wetting line, seepage flow and stress and strain inside the dam are obtained. The data results are reasonable and correct. It has certain reference value in the construction of anti-seepage system of earth-rock dam.
Prediction model of vertical shaft air temperature and its application
Authors: Bian Menglong , Wang Wencai
Published: November 2019

In order to obtain the distribution law of the temperature field of the vertical airflow, a theoretical model of the wind temperature forecasting of the vertical well is established and simplified on the basis of considering the convective heat transfer and the exchange moisture. The measured error of the theoretical model is between -3.1% and 2% by measuring the variation of air and surrounding rock parameters in a shaft. The theoretical model is used to analyse the effects of surface climate on the deep environment in vertical shaft. The temperature of the airflow is affected by the seasonal climate, and the influence is weakened with the increase of the ventilation distance. The greater the relative humidity change in the vertical well, the smaller the variation of the airflow temperature value, and the decrease of the temperature is affected by the enthalpy. When the shaft deep humidity environment is certain, the greater the humidity, the greater the temperature change.
Climatic Adaptability Design Strategy of Residential Zones based on Climate Consultant and Ecotect Analysis-- Taking Weidong New Town Community as an Example
Authors: Liu Siqi , Wang Jing
Published: November 2019

With the development of society and the improvement of economic level, cities have carried out large-scale construction, among which residential buildings are the fastest growing. The research on low energy consumption of residential areas and residential buildings has become the key to achieve low carbon development in China. Taking Weidong new town community in Weinan as the research area, this paper objectively and comprehensively analyzed the climate environment of the project area from the aspects of temperature, humidity, ventilation and solar radiation through Climate Consultant and Ecotect, and discussed the climate adaptability design strategy of the project area. The thermal comfort assessment of the main activity space in residential area has certain reference value for building energy saving and creating comfortable living environment.
Study of Shaking Table Test of Rigid-subrigid Pile Composite Foundation under Sandy Field Condition
Authors: Li Lin , Zhang Jichao , Li Yadong , Rao Zhuwei , Zheng Sen
Published: November 2019

To study the seismic response of rigid-subrigid pile composite foundation, shaking table test was conducted under sandy field condition. The experimental results show that the acceleration response strength of the pile top is greater than that of the pile bottom, and is smaller with the increase of buried depth; seismic wave types will have an impact on the acceleration amplification effect; from pile bottom to pile top, the peak value of Fourier spectrum increases gradually, and the frequency distribution of Fourier spectrum in frequency domain does not change. The frequency range of the peak value of Fourier spectrum under three kinds of seismic waves is different; with the peak acceleration of the input excitation increase, the strain peak of pile body changes more and more significantly along the length direction, and the strain peak of rigid pile appears abnormal, which is the weak part of seismic resistance.
Causes and Treatment Methods of PDC bit Body Drop Accident in Gao a Well
Authors: Wang Dong
Published: November 2019

In the process of drilling the Halliburton PDC bit in the 311.2mm borehole, the No. A well in Gaoshi experienced a drilling accident first. After drilling the drill, no problem was found and then re-into the well, but the well was unstable. There was a collapse phenomenon, and a stuck drill was encountered. After the treatment, the PDC bit body was found to be neatly broken when the worker lifted the drill. Finally, after several rounds of grinding and wire fishing, the accident was effectively treated.
Prediction of Industrial Hazardous Waste Production Based on Different Models
Authors: Liu Shuangliu , Cheng Liang , Chen Peng , Xu Shunqing , Gao Jun , Lu Jing
Published: November 2019

Based on national hazardous waste production data from 2008 to 2011, GM (1,1) grey model, unit industrial output value model and average annual growth rate model are used for prediction studies of which the prediction results was compared with the actual values of hazardous waste from 2012 to 2016. Under the selected background data, all the three widely-used models have large deviations. The model with the smallest deviation range is the annual growth rate model of which the prediction result is 1.25-2.05 times the actual value. The model with the second small deviation range is the unit output value model of which the prediction result is 1.36-3.63 times the actual value. GM (1,1) has the largest deviation range, of which the prediction result is 1.46-7.58 times the actual value. The causes of deviation are analyzed, and the results show that, due to the influence of different factors, the background data significantly rocketed in 2011 and 2016, resulting in the instability of the model prediction. Based on the application of the models, the applicability of different models is analyzed. It is suggested that the grey model should be preferred when there are a few data; and the easy-to-operate unit output value model and annual growth rate model shall be preferred when there are sufficient historical data. Meanwhile, the influence of industry and policy factors should be comprehensively considered to improve and optimize the prediction methods and parameters of the models, so as to provide reference for quantitative prediction of hazardous wastes.
Development Status and Prospects of Deep Seawater Comprehensive Utilization Industry
Authors: Gao Chunjuan , Zhang Yanan , Wu Dan , Ma Laibo , Zhang Yushan , Zhang Qi , Huang Xiping
Published: November 2019

The definition, resource characteristics and application of deep seawater were introduced in this paper. Meanwhile, the current status of development and utilization of deep seawater resources at home and abroad was summarized. Finally, the prospects for the development and application of deep seawater are prospected.
Research on the dam foundation pit hydrogeological problems in Dadu river deep overburden layer area
Authors: Zhang Shishu , Kang Xiaobing , Xu Mo , Huang Runtai , Hu Jinshan , Li Qiang , Ruan Congyan
Published: November 2019

Western Sichuan is located in the two and three steps of transition zone of our country on the terrain, in the area of Dadu River valley was “V” type, the valley is widely distributed deep overburden layer. The existence of deep overburden layer not only greatly increases the difficulty of hydropower development in the southwest region, but also gives birth to a series of new scientific problems. This paper analyze the basic feature and formation of deep overburden layer in the Dadu River, and then discuss the may encounter hydrogeological problems with the pit water gushing, piping and flow sand.
Regional applicability analysis of four drought indices in Chongzuo of South China
Authors: Zhang Gang , Teng Jiduan , Zhang Lijie , Luo Lihua , Qin Zhuanghao
Published: November 2019

Based on the precipitation anomaly percentage index (Pa), the relative moisture index (MI), the standardized precipitation index (SPI), and the standardized precipitation evapotranspiration index (SPEI), the regional applicability was examined in Chongzuo over the period 1961to 2012. The results showed that: (1) The MI and Pa significantly underestimated severe drought and extreme drought at annul time scale. The monitoring result of annual SPEI and SPI was accurate and more close to the actual drought level. (2) The frequency range of different drought class is close to actual level for the SPI and SPEI at different time scale. The severe and extreme drought seldom occurred using Pa and MI monitoring results, the adaptability and reliability of MI were relatively lower in Chongzuo. (3) The annual MI and Pa showed smaller coverage with the severity of moderate and above drought than statistical results of SPI and SPEI in Chongzuo. (4) The SPI was found more sensitive to precipitation changes than the SPEI at 1-month scale in dry period. SPI and SPEI can be properly used for the monitoring as well.
Initial Corrosion Behavior of Pure Copper in Atmospheric Environment
Authors: Yan Fengjie , Li Xingeng , Jiang Bo , Lin Deyuan , Fu Min , Li Wenjing
Published: November 2019

The corrosion behavior of pure copper with sodium chloride deposition and without sodium chloride deposition in atmospheric environment was studied by 500h environmental corrosion test and linear polarization test in laboratory, as well as characterization of corrosion products by SEM and XRD. The results showed that pure copper displayed good corrosion resistance in inland atmospheric environment without pollution. After depositing NaCl salt to the surface of pure copper, the corrosion current density increases sharply and plenty of corrosion products is formed on the surface of the sample, consisting of CuO, Cu2O and CuSO4·H2O.
Prevention and Control Measures of Abnormal Gas Emission in Low Permeability and High Gas Mining Face
Authors: Zhang Jufeng , Xu Tai , Yang Fengfeng , Zheng Chao , Feng Biyang , Miao Zaiquan , Zhang Jianjiang
Published: November 2019

China is rich in coal resources, especially in Northwest China. However, due to the complex geological conditions, some low permeability and high gas seams often accompany abnormal gas emission during mining, which poses a serious threat to the safety of coal mine. This paper takes East 102 working face of Weijiadi Coal Mine in Jingyuan mining area of Gansu Province as the research object. Aiming at the abnormal gas emission phenomenon during the initial discharge period of working face, the causes of abnormal gas emission are analyzed. The prevention of abnormal gas emission should be carried out from five aspects: strengthening ventilation management, perfecting gas extraction system, perfecting safety monitoring and control system, strengthening power supply management and emergency management on site.
Study on the Wet Oxidation of an Industrial High Concentration Caprolactam Organic Wastewater
Authors: Guo Pengfei , Wang Li , Zeng Xu , Yao Guodong , Zhou Yangyuan , Zhao Jianfu
Published: November 2019

In this study, wet oxidation of an industrial high concentration caprolactam organic wastewater using oxygen gas as an oxidant was investigated. Different experiments were conducted to discuss the effects of the reaction temperature, time, the initial oxygen pressure and dilution ration of raw wastewater, using a batch reactor with COD removal rate as a standard for assessing. Results show that the highest removal rate of COD, 76.6%, was obtained at 250 °C for 30 min with the oxygen pressure 1.7 MPa and dilution ration 10. The biodegradability of the wastewater improved greatly after the wet oxidation process. These results illustrated that wet oxidation with oxygen gas as an oxidant displayed effectively for the pretreatment of high concentration caprolactam organic wastewater.
Controller parameters tuning of PV Based on PSASP/UD by AGA
Authors: Hua Guanghui , Wang Chun , Fa Ladier , Shi Linjun
Published: November 2019

Photovoltaic (PV) station generally adopts single-stage grid-connection inverter considering the cost and efficiency, and the controller parameters have great influence on the grid-connected performance of PV system. The PV array, maximum power point tracking (MPPT), the inverter and its control system models are built in PSASP/UD. The PI parameters of invert controller are tuned by adaptive genetic algorithm (AGA) and genetic algorithm (GA) respectively in single-machine infinite bus system (SMIBS) based on Simulink. Finally, single-machine infinite bus system (FMTAS) with PV based on PSASP/UD is used to verify the feasibility and effectiveness of models and validity of controller parameters.
Study on Cone Penetration Test of Sand Layer along Southwest Coast of Hainan Island
Authors: Tian Shihao , Tai Jun , Zang Meng , Liu Anqi , Dong Zhitao , Cai Jixian
Published: November 2019

Coastal dunes are widely distributed along the southwestern coast of Hainan Island paralleling to the coastline. Cone penetration test is a commonly used in-situ testing method in geotechnical engineering, it has strong advantage in sand layer which is difficult to obtain undisturbed sample. Through the cone penetration tests and the laboratory test on sand with different densities and grain size distributions, the correlation between in-situ test index and laboratory test index was analyzed. It is found that the hit number of standard penetration test is linearly correlated with the tip resistance of cone penetration test, so the density of sand can be judged by the value of tip resistance. The content of silt and clay in sand has a great influence on side friction and friction ratio of cone penetration test, and the friction ratio is linearly related to the content of silt and clay. For different sand with same geological origin, the particle-size distribution has great impact on the friction ratio, the larger the main particle size is, and the smaller the friction ratio is. For same sand with different geological origin, the content of silt and clay of sand is different, and the cone penetration test curve and the particle-size distribution curve are also different.
Gas content prediction and gas cascade control based on gas geological unit
Authors: Zhang Jufeng , Xu Tai , Yang Fengfeng , Zheng Chao , Lei Wulin , Miao Zaiquan , Zhang Jianjiang
Published: November 2019

The division of gas geological units in coal mine is the basis of studying the occurrence law of gas geology in coal mine field, which is of great significance to the prediction of regional gas content and gas emission. Taking Weijiadi coalfield in Jingyuan mining area of Gansu Province as an object, this paper divides the coalfield into gas geological units, according to the gas content of coal seams in different regions, targeted gas extraction measures are implemented, gas cascade control is implemented, regional gas abnormal emission is strictly prevented, and mine safety production is ensured.
Study on Distribution Law of Formation Water in S209 Well Area
Authors: Jia Lianchao , Geng Shaoyang , Zhang Xiaoyan , Sun Jianwei , Yang Guoping , Yuan Dan , Jiang Tingting
Published: November 2019

The Shaan 209 area of the 2nd section of Yulin gas field is a water-rich area. The water production of most wells is too large, which seriously affects the production of gas wells in the well area. Based on the research foundation work area formation water chemistry characteristics and distribution of the testing, laboratory analysis based on existing formation water, combined with geochemical classification, analysis of the formation water type, cause, distribution of well Shaan 209 in Yulin south area, the main control factors of the formation water in the working area are identified. Therefore, it is demonstrated that the Shan 2 section of water-rich area still has development potential, which provides a basis for the optimization of management strategies in the rich water area, and lays a foundation for the scientific and efficient development of the Yulin South area.
Characterization of compositions in crude oil and the effect of inhibitor on the crystallization of paraffin
Authors: Peng Sen , Tang Xiaoben , Yang Anguo , Chen Shijun , Chen Gang , Dong Sanbao
Published: November 2019

Flowability is one of the important characters of a crude oil in pipelines. The viscosity of one crude oil is affected by many factors (e.g., temperature, water cut, composition distribution, paraffin deposition, etc.). In this study, IR, thermogravimetry analysis (TGA) and UV measurement are employed to characterize the composition of the crude oil (HN-1) provided by Henan Oilfield. The paraffin morphology analysis is employed to rate the property of a mixture of paraffin inhibitors and analysis the mechanism of the paraffin inhibition.
Study on the Double-Difference Hypocenter Locations based on the envelope stations underground mines
Authors: Dai Rui , Zhang Da , Ji Hu , Shi Yaqian
Published: November 2019

At present, the micro-seismic monitoring system mostly adopts the mean velocity model and the absolute location method and the focal location error is large, which seriously affects the later processing interpretation, safety evaluation, and roadway support design. To tackle this problem, this paper adopts the absolute locating method based on the average velocity model under the envelope stations, the absolute positioning method is used to obtain the initial positioning result, and then we apply distance-weighting scheme for the monitoring station and the key monitoring area. Furthermore, the Double-Difference Hypocenter Locations is used for relocation. Finally, the mine site data is used to carry out the IMS micro-seismic monitoring system positioning results and the double-difference positioning results benchmarking, and the linkage analysis with the mine site mining process. The results show that the relocation results obtained by the Double-Difference Hypocenter Locations based on the envelope stations are more reliable and more accurately match the area where the hazard source is located during mining.
Study on the changes of soil thermal conductivity of sugarcane field under different tillage methods
Authors: Zhu Yanguang
Published: November 2019

The smash-ridging tillage (T) treatment and no-tillage (NT) treatment were set up in the sugarcane planting area of the Lijian Research Science Base of Guangxi Academy of Agricultural Sciences. The soil moisture content at 5, 20 and 40cm depths were obtained by location monitoring, and the soil thermal conductivity was calculated combined with some basic soil properties. The results showed that the soil thermal conductivity of T treatment at different depths were 40 cm>20 cm>5 cm. And in the site of NT treatment of that were 40 cm>5 cm>20 cm. In a few words, the thermal conductivity above 20 cm layer of soil at T treatment were basically significantly higher (P<0.05) than NT during the experiment period, but were not significant difference between T and NT treatment at the 40 cm depth. These laws were mainly due to the ability of smash-ridging tillage of storing water greater than the no-tillage pattern, which indicating the smash-ridging tillage in this study can improve soil thermal conductivity better.
Dynamic and static pressure combined water injection and dust reduction technology in fully mechanized top coal caving face
Authors: Chen Fang
Published: November 2019

In order to solve the problem of high dust concentration in fully mechanized top-coal caving face with difficult wetting and high dust production, a combined water injection test of “long period static pressure, alternating dynamic static pressure and static pressure in stress-affected zone” was carried out in Wangjialing Coal Mine with the engineering background of fully mechanized top-coal caving face in 20107 and combined with the previous water injection test and field actual situation. By comparing and studying the wetting and dust-reducing effects of different water injection methods and borehole spacing, the water injection process parameters suitable for this kind of coal seam are obtained. The field practice shows that the wetting radius can be increased to 3 m by the combined water injection process. In the water injection area with 5 m drilling spacing, the total dust removal efficiency can reach 57% and the respirator dust removal efficiency can reach 70%. It can effectively solve the dust hazard problem of the working face, and the effect is re-markable.
The CO2 foam stabilized with the mixture of CO2-soluble surfactants
Authors: Zhang Xuan , Zhang Tao , Ge Jijiang , Zhang Guicai
Published: November 2019

The CO2-soluble surfactants have been studied extensively for their ability to reduce gas mobility and provide the essential mobility control in CO2-EOR in recent years. In this paper, the synergism of the mixture was investigated. It was conducted that the cloud pressure points of surfactants mixture were located in the middle of single component. However, the synergism of viscosity was positive absolutely, where the apparent foam viscosity of mixture in sand-pack could increase 22.3% and 8.5% separately, comparing with C12-14NEO2 and C16-18NEO5. Anyway, adding the C16-18NEOx to C12-14NEO2 makes the CO2 foam more stable and viscous and CO2 mobility in reservoir was reduced efficiently.
The oil-producing characteristics of Bang-Bang control for 2D reservoir
Authors: Ma Yinfei , Shi Anfeng , Wang Xiaohong
Published: November 2019

The Bang-Bang control is one of the primary control methods to increase the cumulative oil production for water-flooding reservoir. The on-off state and operating time of the injection wells are adjusted to enhance the efficiency. In this article, the oil-producing characteristics of Bang-Bang control for optimization problems of 2D reservoir is studied. The efficiency of Bang-Bang control in different stages during the whole oilfield development process has been concluded. The regularity of the Bang-Bang control’s strategy is summarized. The numerical simulation results show that, in early stage of oilfield development, Bang-Bang control may be the optimal solution amongst two-segment regulation strategies. In middle period, Bang-Bang control gains less oil production than the simultaneous optimization scheme. In high water-cut period, Bang-Bang control’s oil production is approaching simultaneous scheme. For Bang-Bang control’s optimal strategies, according to the distance between the production well and injection well, the farther injection well is supposed to open first, then it will be closed and nearer well will open to operate in the next segment. With the total production time become longer, the proportion of farther well’s operating time will increase and stabilize at certain value finally. For engineering practice, it indicate that the optimal regulation strategies need to be formulated according to reservoir’s development stages in order to improve the efficiency of oil production.
A new method for calculating the exchange flux in discrete fracture model for two-phase flow in fractured porous media
Authors: Li Lu , Shi Anfeng , Wang Xiaohong
Published: November 2019

The discrete fracture model (DFM) is widely used in order to simulate the flow state of two phase flow in fractured reservoirs. There is a strong capillary pressure contrast between the matrix and the fracture in low-permeability reservoirs with conductive fractures. The physical quantities of the matrix-fracture interface change drastically and the flow pattern near the interface depends on the flow direction which make it very difficult to calculate the matrix-fracture exchange flux. New interface conditions are applied in this paper to get a scheme for calculating the
m-f
exchange flux. Based on new interface conditions the scheme for calculating the exchange flux is established. This scheme can improve the computational efficiency of the multi-phase flow in DFM since considering the discontinuous of physical quantities near the interface. The numerical test show that the proposed model has better performance than the traditional model.
Economic analysis of a water source heat pump– direct surface water cooling hybrid system
Authors: Jiang Xudong , Chen Jinhua
Published: November 2019

IN order to realize the energy saving potential of natural water sources, a complex system of low temperature surface water cooling and water source heat pump is proposed. Taking the actual project as an example, a LCC calculation model for engineering evaluation was established. DeST-c was used to simulate the annual energy consumption of the engineering example. The relationship between load changes of FCU and AHU is analysed when the outdoor climate and the use of building changed. The calculation of LCC was based on performance curves of water source heat pump unit and variable frequency pump. Comparing the LCC components with the hybrid system, conventional system and water source heat pump, it was found that the LCC of hybrid system was 70% of conventional system and 83% of water source heat pump. The hybrid system of low temperature surface water cooling and water source heat pump has great energy saving potential and economic benefits.
Construction technology of the freezing method for the connecting-passage in the subway
Authors: Zhang Mengheng , Wan Heng , Yang Yongjie , Mao Yufei , Li Wei , Shen Peng , Luo Qingfei
Published: November 2019

Taking the subway shield tunnel of Dagengjia Station to Longchuan Road Station of the first phase of Harbin Rail Transit Line 2 as the background, the freezing construction scheme and construction of the interval connecting-passage were introduced. The analysis and monitoring data show that the maximum settlement of the ground caused by the construction of the freezing method is -5mm, the maximum ridge is 6.12mm; the maximum settlement of the underground pipeline is -5.51mm; the maximum settlement of the connecting-passage is -7.13mm, the convergence value The maximum is 1.80mm, which is less than the construction control value and meets the construction requirements.
Study on economics of depth peak-shaving for 1000MW ultra supercritical unit
Authors: Che Yongqiang , Zheng Wei , Han Yue , Yang Jianzhu , Lv Haizhen
Published: November 2019

With the increase of the demand for deep peak regulation of power grid, large-capacity units have the advantages of strong peak regulation capacity. 1000MW units have been widely involved in deep peak regulation. In the process of deep peak regulation, the actual working condition of the unit deviates greatly from the designed working condition, and the unit efficiency decreases significantly, making the unit economy deteriorate seriously, especially in the 1000MW grade unit. In this paper, a 1000MW unit depth peak adjustment is experimentally studied and its economic indexes are calculated. Then, by analyzing the test data, the optimization Suggestions for the operation of the unit during the depth peak adjustment are put forward:(1)Improve the opening of the high pressure switch of the unit to reduce throttling loss and improve the unit efficiency; (2)Increase the reheat steam temperature to ensure the stable operation of the reheat steam temperature at 620 °C of the full load section; (3) Keep a circulating pump running at a low speed during deep peak adjustment to reduce power consumption.
Design of Feeding Device for Coal Bed Methane Truck-mounted Drilling Rig
Authors: Fan Dong
Published: November 2019

Feeding device is the main mechanism of truck-mounted drilling rig, and determines the rig’s performance. Three types of feeding device such as double-cylinder telescopic mast, three-cylinder telescopic mast, and sub-load composite cylinder-winch are designed based on the analysis of the working principle and load characteristics of the feeding device. The paper compares the three schemes of structure design and composite cylinder-winch structure is established as the optimal scheme. Then the optimal scheme’s strength is checked using finite element analysis method and the main points of its structural design are pointed out.
3D line matching model and optimization for rigid pipeline assembly
Authors: Li Pin , Shen Zongbao
Published: November 2019

Rigid pipeline assembly via welding has rich applications in mechanical engineering and civil engineering. The quality of assembly directly influences the reliability, performance, and lifecycle of products. In the assembly process, two ends of a rigid pipeline are required to be matched with another two ends of existing pipelines. Due to the installation errors, two ends of a rigid pipe may not match their corresponding targets. To mitigate the dismatch, the following two issues need to be addressed: (i) matching the axis lines of the ends of the moving pipe and the axis lines of the ends of the existing pipes; and (ii) maximizing the overlap areas of each end of the moving pipe and its corresponding target on an existing pipe. The mathematical model of rigid pipeline assembly problem is established and a method for computing a nice initial position of the moving pipeline with respect to installed pipes is proposed. An iterative optimization algorithm are elaborated to address the problems. Using a running example, it is shown that our proposed methods are efficient for solving the problems.
Research on Railway Emergency Rescue Path Selection Based on GIS
Authors: Tang Zhaoping , Zhou Shengyu , Geng Biao , Sun Jianping
Published: November 2019

After the railway emergency, how to transport emergency rescue resources to the accident site in time and reduce all kinds of unnecessary losses caused by the accident is the primary purpose. Based on the theory of Geographic Information System (GIS), a calculation model of the shortest path was established. By using ArcMap software, the network data set based on railway network was analyzed and calculated, and the shortest path from emergency rescue point to accident point was solved and visualized. And supposed that an emergency happened in the area under the jurisdiction of Nanchang Railway Administration, and made an empirical analysis of it. It provides reference for the selection of emergency rescue path after railway emergencies.
The Field Application of Direct Reading Efficient Measurement and Adjustment Process
Authors: Wu Kaiming
Published: November 2019

The direct reading high-efficiency measuring instrument adopts a combination of dual flow and non-current collecting and measuring methods, that is, a flow tester is arranged at both ends of the water distribution device, and the flow changes above and below the water distributor are tested. The calculated difference flow rate is the actual water injection amount of the interval, and the flow adjustment based on this is highly targeted and accurate. At the same time, the cable is used to transmit signals, and the working condition of the plug adjusting device can be visually monitored through the notebook computer. The application of the PC measurement and adjustment software can calculate the water volume of the mixing layer and facilitate on-site operation. In this paper, the test situation of the dual flow non-current collecting direct reading high-efficiency measurement and adjustment process in the eccentric injection well stratification test site is summarized, and the practicability of the process on site is demonstrated. A detailed summary and argumentation were made for the advantages, problems and operational points that the process showed in the stratified test work.
Design and Implementation of Geographic Information System Based on Environmental Dynamics in Mine Scheduling
Authors: Jiang Shuhui , Tang Kairong , Ju Hui
Published: November 2019

With the development of computer technology, it is possible to visualize the demand of mine safety and production process. At the same time, the demand of mine resources for social construction and the people’s lives has been showing a rapid upward trend, which invisibly brings opportunities and challenges to the development of mine undertakings. Under the dynamic environment, mine production, transportation, ventilation, gas, power supply and industrial television operation are monitored at any time, and enterprise panoramic information is displayed from multiple angles, so as to realize timely shunt processing and tracking of dispatching information. User staff can obtain real-time information such as location, thus ensuring the safety of mining personnel and property, improving work efficiency and enterprise benefits, and further promoting the design key components of the environmental dynamic geographic information system in mine scheduling. With environmental dynamics as the regulating variable, geographic information system is an information system that collects, stores, manages, describes and analyzes data related to the earth’s surface, space and geographic distribution.
Research on Determination Method of Gas Drainage Radius Based on Elastoplastic Softening Model
Authors: Li Shengzhou
Published: November 2019

Based on the elasto-plastic softening model and the theory of gas seepage, this paper establishes the calculation model of the gas pressure and the pumping time of the coal around the mining. The COMSOL Multiphysics simulation software is used to simulate the gas pressure of the surrounding coal Distribution with time. According to the basic parameters of the 3# coal seam in the mine, the simulation results show that the effective sampling radius is 1.5m and the model is 1.6m, and the error is small within the allowable range. Based on the elastic - plastic softening model, the mining radius can provide the basis for the design of mine coal mining and drainage, improve the efficiency of gas extraction and ensure the safety of mine production.
Research on Formation Pressure Monitoring While Drilling in Deep Water with High Temperature and High Pressure Wells
Authors: Zhang Zhenxiang , Yang Jin , Zhang Yichi , Zhao Xin , Hong Yuqun , Guo Yafei , Hao Yufei
Published: November 2019

With the deepening of deep water with HTHP oil and gas exploration, there are various reservoir systems, which are complex pressure systems and high and low pressure interfacing in the strata drilled at present. Downhole complications occur frequently in the drilling process, which seriously affects the safety of drilling operations. In this paper, we combine with the drilling example of deep water HTHP X1 well, dc index method and rock strength method are used to monitor formation pressure while drilling. The results show that the rock strength method is more accurate for pressure monitoring of deep water HTHP wells, and it can provide a reference for subsequent monitoring of formation pressure of deep water HTHP wells.
Research on Residual Petroleum in Complex Ultra-low Permeability Fuyu Oil Layer in the Peripheral Area of Western Daqing City and Effect Analysis of Potential Tapping Countermeasures
Authors: Zhang Honghui
Published: November 2019

Qijiabei Oilfield belongs to ultra-low permeability and secondary pore development reservoirs. After years of water injection development, it is difficult to establish effective displacement, poor long-term low-efficiency wells and low development efficiency. problem. In view of the above problems, this paper uses fine reservoir description and multi-disciplinary integration technology to finely describe the fault location, subdivided sedimentary microfacies, partition segmentation fitting physical parameters and fine residual oil research, and find out the main problems of poor oilfield development. the reason. On this basis, according to the dynamic development characteristics, under the premise of quantifying the remaining oil to the permeability level, the targeted measures are formulated for the main remaining oil types, especially for the remaining oil with poor effect, according to the divisional adjustment ideas. The sub-well distinguishing area shall be formulated with individualized measures for tapping and digging potential, that is, comprehensively considering reservoir development, connectivity, and residual oil distribution rules, and implementing targeted oil and water wells corresponding adjustment and production techniques based on the detailed description of remaining oil. The water absorption ratio of oilfield sandstone increased by 8.4%, the output ratio of small layer increased by 18.7%, the natural decline rate decreased by 6.9%, the ultimate recovery rate increased by 1.22%, the oilfield development effect became better, and the research and synthesis of residual oil in complex ultra-low permeability reservoirs Digging potential provides a reference.
Research and Application of Numerical Simulation of Hydraulic Fracturing in Low Permeability Fracture Reservoirs
Authors: Zhao Qiang
Published: November 2019

Based on FuYu formation of DaQing oil field, built the geology, 3D rock mechanics and 3D stress field models with core and logging data, and obtained the properties of any point between wellbores. With the fracturing principle, the actual geometry of the fractures can be calculated, and the asymmetry fractures model can be built, including the lengt’h, height, width and the direction of the fractures. With the analysis of production history, the residual oil distribution can be obtained, and the multiple fracturing procedure can be designed. With the guidance of the asymmetric fracture models, the daily increase of production is more than 4 ton.
Research and Exploration of Ecological Highway Carbon Sequestration Forest Methodology
Authors: Ying Haining , Wan Lijuan , Deng Shejun , Cheng Dongxiang , Jiang Yanming
Published: November 2019

Based on the demand of ecological highway construction, this paper explores the research work of carbon sequestration forest. The introduction of forest carbon sinks and advanced concepts of the forestry carbon sequestration, and for the measurement of the highway in the carbon sink forest carbon sink monitoring and exploration on the aspects, such as, the forest carbon sinks and forestry carbon sink theory knowledge, used in highway transportation, implements the carbon sink forest methodology used in the field of traffic, road area change ever green landscape, the shrub tree species as the main design concept, put forward the concept of carbon sequestration in the road system and based on the neutral roadside greening design forestry carbon sequestration. On the basis of energy conservation and emission reduction, the construction of carbon sequestration forest is adopted to solve the carbon emission problem of the transportation industry from another perspective, so as to improve the quality of planting trees along the transportation lines of Jiangsu province and even the whole country, update the greening concept, enhance carbon sequestration and ecological efficiency, and open up a new path for building a green transportation environment.