bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Fuzzy Mathematics Evaluation Method in Prediction of Comprehensive Efficiency of Low Efficiency Oil Wells
Authors: Li Xiaofeng
Published: November 2019

In the process of oilfield development, due to long-term continuous mining and changes in geological conditions, oil-inefficient wells will be gradually produced. This phenomenon is unavoidable. How to optimize the low-efficiency oil wells with comprehensive mining potential according to the actual development situation, so as to achieve effective treatment of low-efficiency oil wells, this approach is of great significance to ensure and improve the overall economic benefits of the oilfield. In this paper, the fuzzy mathematics method and the statistical weighting theory are used for comprehensive analysis. The weight of the evaluation index is predicted by determining the comprehensive adjustment potential of the low-efficiency oil well, and then the low-efficiency oil well comprehensive adjustment potential prediction evaluation model and method are established, and then the practical application is carried out. The method can provide a basis for judging the comprehensive adjustment measures for the development of low-efficiency oil wells in oil fields.
The propagation research of hydraulically created fractures in coal seams based on discrete element method
Authors: Lu Yanjun , Han Jinxuan , Shelepov V.V , Wang Qiang , Zhu Yongsheng , Guo Junfeng , Zhang Liang , Han Wei
Published: November 2019

Coalbed methane (CBM) is clean unconventional energy that can be exploited with stimulation treatment to realize commercial value, and hydraulic fracturing is the key technology for increasing CBM production. The simulation of hydraulic fractures is an important research content that can guide the engineering practice to achieve the purpose of increasing production. Based on the distribution characteristic of cleats in coal, the research on the propagation of hydraulic fractures is carried out via Discrete element method (DEM). The simulated results show that: hydraulic fractures mainly propagate along the cleats towards the maximum principal stress. The fracture network can be formed due to the intersection of face cleats and butt cleats that can propagate at certain pressure. During the injection process of fracturing fluid, the pressure at injection point decreases with the fracture propagation until the pressure tends to be stable. With the increase of injection rate and fracturing fluid viscosity at the same condition, the maximum aperture of hydraulic fracture increases, while the length of principal hydraulic fracture shortens. Therefore, to achieve the purpose of forming hydraulic fracture network in coal seams with cleats, low viscosity fracturing fluid and low injection rate need be applied to the fracturing technology. As the cleat density increases, the number of branch fractures increases, but the length of principal hydraulic fracture becomes short. Long and narrow hydraulic fractures are easily formed in coal seams with lower cleat density.
Calculation and visualization of relative position uncertainty between adjacent wellbores
Authors: Diao Binbin , Gao Deli , Jiang Chuang
Published: November 2019

In directional drilling engineering of cluster wells and infill wells, it is important to scientifically assess the risk of wellbore collisions between wells being drilled and adjacent wells that have already been drilled. At present, the calculation results of adjacent well distance scanning and separation factors often used in drilling sites still cannot scientifically evaluate the risk of wellbore collision. This paper proposes to characterize the relative position measurement error between the reference well and the comparison well by the size of the combined error ellipsoid with the effect of well diameters of reference well and comparison well. And, the calculation model of the combined ellipsoid is established. This paper also introduces the 3D visualization method of relative position measurement error between adjacent wells based on OpenGL. The example calculating shows that the calculation results and 3D views of the relative position measurement error of the adjacent wells a can be used to judge the reliability of the calculation result of the pedal curve separation factors, and provide a more scientific basis for the implementation of anti-collision operations in directional drilling. So the research has important application value.
Study on Associated Rare Earth Minerals in Huayang Chuan Uranium Polymetallic Mine
Authors: Wang Dequan , Wang Jianguo , Wang Yizhong
Published: November 2019

Huayangchuan uranium polymetallic deposit is located in Huaxian County, Huayin City, Shaanxi Province.The geotectonic location belongs to the Xiaoqinling intracontinental orogenic belt on the southern margin of the North China block.The average content of rare earth in uranium ore reaches 740 ×10−6. Rare earth minerals in ores have been studied by means of microscopic identification and scanning electron microscopic energy spectrum analysis.we believe that the rare earth minerals in Huayangchuan uranium polymetallic ore are mainly brown epidote, bastnaesite, gadolinite, monazite and ancylite. Among them, the most important rare earth mineral is epidote.
Synthesis and study of polystyrene/montmorillonite nanocomposite emulsion drilling fluid lubricant
Authors: Zhang Zhengrong , Liu Huiting , Yu Yongjin , Ke Yangchuan , Yu Chengcheng
Published: November 2019

Conventional drilling fluid lubricants could effectively improve the lubricity of the system, but the temperature and salt resistance was poor. In this paper, a new type of emulsion drilling fluid lubricant was prepared by mixing a polystyrene/modified montmorillonite (MMT) nanocomposite emulsion with vegetable base oil. The nanocomposite emulsion was prepared by emulsion polymerization of organic MMT, modified with the tributyltetradecylphosphonium chloride and sodium lauryl sulfonate, and styrene. The work revealed effects of the amount of modified MMT and lubricant on the performance of the drilling fluid. It was shown that lubricants have less effect on the rheology and density changes of the drilling fluid. The lubricity, temperature resistance and salt resistance of the drilling fluid were enhanced, while the fluid loss was significantly reduced due to the addition of the lubricant. Our results provide the basic method needed to guide design of the lubricant.
Discussion of the deflagration index expression for cylindrical vessel
Authors: Song Zhe , Zhang Peili , Liang Jianjun , Zhang Deyang
Published: November 2019

The cube-root law and the expression of the maximum overpressure rise rate available in the most literatures are accurate when they are used to calculate or assess the gas explosion intensity in a spherical vessel, however, large deviation will be occurred when they are extended to the vessels of other shapes and sizes. The deflagration index KG expression for the cylindrical vessel case is put forward and discussed, and the difference between the deflagration index formula of the spherical and cylindrical vessel are also simply discussed. The conclusions drawn by this paper may be useful to the gas explosion intensity calculation or assessment in cylindrical vessel explosions.
Study on new method for evaluating reservoir formation pressure by wellhead pressure
Authors: Wen Xiaoyong , Yang Jing , Geng Shaoyang , Li Ke
Published: November 2019

Formation pressure is an essential parameter for calculating the dynamic geological reserves, evaluating the development effect of oil and gas fields, conducting the daily dynamic analysis of oil and gas Wells and predicting the dynamic of oil and gas fields. Generally, the calculation of reservoir average formation pressure is to use the pressure in the infinite formation to solve the formation pressure. This paper presents a new method for calculating the pressure at any point of one source and one sink by using wellhead pressure. This method has been well applied in the Saertu-Putaohua industrial area.
Research on the correlation between regional energy consumption and urbanization rate in China
Authors: Xu Zhao , Shan Baoguo , Duan Jinhui
Published: November 2019

By the end of 2018, China’s urbanization rate was close to 60%, and the proportion of energy consumed by cities to the total national energy consumption exceeded 80%. Cities, like huge machines that never stop running, consume a lot of coal, oil and gas, electricity day and night, and maintain the food, clothing, shelter and transportation of urban residents, as well as thousands of lights. Study of the relationship between urbanization rate and energy consumption provides important technical support for regional energy supply and demand research and forecasting. The results show that the process of urbanization development will inevitably lead to a large consumption of energy resources and an increase in per capita energy consumption.
Flora analysis of seed plants in Daxiong mountain of Hunan province
Authors: Li Changqing , She Jiyun , Wu Yi
Published: November 2019

Based on field investigation and relevant information about Daxiong Mountain, we do the area types analysis of the seed plant. The results showed that: (1) There were1218 species of seed plants in this region, belong to 166 families and 668 genera, including 6 families, 11 genera, 14 species of gymnosperm and 160 families, 657 genera, 1204 species of angiosperms. (2) The composition of the seed plants in this region was highly dispersed and very complex. In the composition of the families, the number of small families was the most, which rate was 40.00%. However, the major families contains the largest number of plant species, the rate was 34.51%. In the composition of the genus, species focus on the small genera and the single genus that accounted for 37.14% and 51.43%. (3) The flora of seed plants in this region was complex. There were 267 genera, 46.05% genera of the total, in the tropical distribution. Followed by the temperate distribution of 171 genera, accounting for 28.24%. In addition, the Asian distribution including 168 genera, 27.71% of the total and the world distribution including 62 genera, accounting for 9.28% of the total.
Study on suitable air volume for cooling in horizontal roadway
Authors: Bian Menglong , Wang Wencai
Published: November 2019

In the deep mining of mines, the choice of air volume needs to consider both the cooling effect and the energy consumption. In order to obtain the basis for selecting the suitable air volume in the horizontal roadway, based on the theory of heat transfer and thermodynamics, the heat transfer relationship in the horizontal roadway is analyzed. The study found that the suitable air volume mainly considers the influence of three parameters: air self parameters, roadway specification parameters and temperature boundary parameters. As the air volume increases, the cooling effect gradually decreases, and the energy consumption gradually increases. After the air volume reaches a certain value, the cooling effect is basically unchanged, and the energy consumption is too high to bear.
Research and empirical analysis on structural decomposition model of energy saving contribution sources for provinces in China
Authors: Chen Yunfei , Cao Yuwei , Zeng Bo , Zeng Ming , Guo Xiaopeng , Shan Baoguo , Jia Dexiang , Xu Shaojun
Published: November 2019

With the continuous improvement of China’s economic scale and increasing energy demand, various regions have become increasingly dependent on energy, and energy conservation has become an important measure to ensure energy security and protect the environment.In this context, in order to ensure the targeted implementation of energy-saving and emission reduction measures in various regions and promote the gradual transition of China’s economy to low-carbon green, this paper analyzes the current energy consumption status of each province and decomposes its energy conservation contribution source structure. And an empirical analysis was carried out to effectively promote the implementation of energy conservation in China.
Basic Research on Application of Airborne Ventilation and Dust Removal in Fully Mechanized Mining Face with Large Mining Height
Authors: Guo Yongwen , Mo Jinming , Liu Yunqiu , Ma Wei , Zhang Sheji
Published: November 2019

Taking the fully mechanized mining face of bulianta 12511 as the research object, the distribution law of dust movement in fully mechanized mining face with 8m large mining height was numerically simulated by using CFD software. Through the simulation results of the original dust field, it is found that the dust produced by the collapsed coal seam diffuses to the rear of the shearer under the action of wind flow, the highest point of movement of high-concentration dust mass can reach 4m, and the dust concentration gradually decreases along the roadway. High concentration dust is mainly concentrated in the 10m range before and after the shearer and on the side of the bottom plate close to the coal retaining plate, with a maximum of 3500mg/m3. In order to effectively reduce the dust in the working face, prevent dust accumulation and pollute the underground working environment, this paper innovatively proposes to install an airborne dust collector in the large mining height working face to control the dust spreading to the pedestrian side at the dust source and purify the dust. By studying the influence of dust collector placement position and treatment air volume on the dust movement and distribution rule and dust removal effect of the working face, the optimal dust removal efficiency of the working face with large mining height is obtained by the dust collector placement position and treatment air volume adaptation combination, and the maximum dust removal efficiency can reach 100%.
Analysis of chemical characteristics of water in the formation of the Sudong area
Authors: Wang Dongmei , Zhang Lin , Yang Zhikai , Yang Yang , Xia Yang
Published: November 2019

In Sudong area, the relationship between gas and water is complex and the hydrochemical characteristics of formation water is unclear, therefore, site managers are eager to figure out the formation water properties and its distribution characteristics in Sudong gas reservoir. In this paper, based on the analytical data of formation water, we studied the type of formation water, the chemical characteristics of produced water, and the hydrochemical characteristics coefficient. The results showed that the water produced in the south and north is formation water and the middle is condensate water; the fracturing fluid is discharged at the early stage of the gas well production, and the formation water is gradually produced in the later stage; the salinity is high in the southwest and lower in the northeast; the water storage condition in the southern formation is higher than that in the north; the time of the water and rock action in the southern area is stronger than that in the north, and from the perspective of oil and gas preservation, the south is better than the north. The research would have a great significance for improving the understanding of formation water in the Sudong block and guiding the rapid and efficient development of the gas field.
Optimization of the Drain Mode for No. 0 High Pressure Heater
Authors: Zhang Yanpeng , Li Susheng , Li Si , Zheng Wei , Zhu Lingkai , Liu Jun , Lao Jinxun
Published: November 2019

The addition of No. 0 high-pressure heater is a new technology with energy saving and emission reduction benefits, the economic analysis of No. 0 high-pressure heater under different loads and drain modes is provided on a 680 MW unit based on the Equivalent enthalpy drop method principle and the comprehensive economic drain mode for No. 0 high-pressure heater is recommended.
Research on the Technique of Multistage Functional Filtration to Repair Black and Odorous Water
Authors: Wang Jing , Dong Zhiliang , Qiu Qingchang , Zhou Hongxing , Deng Kaifang
Published: November 2019

It is of great significance for environmental protection to carry out in-depth research on the treatment of black and odorous water body and form effective water remediation technology. The ecological technology of multistage functional filtration for water restoration can be used as a new and reliable combined filtration process for advanced treatment of black and odorous river, which can effectively intercept pollutants from point sources and purify watershed water. In this paper, a new type of water purification device consisting of cobblestone, quartz sand, activated carbon and PP cotton is developed, which is used to deeply treat black odorous water body and study the filtration and adsorption performance of filter materials on target pollutants. The filtration and adsorption performance of the filter material to the target pollutants, and the influence of the thickness of the filter layer and the particle size of the filter material on the filtration efficiency were studied. The water quality was effectively improved and the purpose of treating the black odor water body was achieved.
A novel optimization method considering fluid production rate and division time for 2D reservoir
Authors: Ma Yinfei , Shi Anfeng , Wang Xiaohong , Tan Baoguo , Sun Hongxia
Published: November 2019

The adjustment and control of the fluid production rates is one of the primary methods to increase the cumulative oil production for water flooding reservoir. In this article, the oil production optimization problem of two-dimensional water-flooding reservoir under the condition of fixed total fluid production rate is studied. The production process is divided into several segments. The relevance between the division time and the fluid production rate is considered. A novel optimization method considering both segmented time and fluid production rate is proposed. The stimulating effect on oil production of this method is tested by a realistic 2 dimensional oil reservoir in China. Compared with other conventional strategies and optimization schemes, this optimization method gains higher cumulative oil production, with the better water sweeping efficiency. For engineering practice, the proposed method may bring more economic benefits.
Spacing Chart for Ultra-low Permeability Reservoirs
Authors: Song Yang
Published: November 2019

The foreign TM oilfield is an ultra-low permeability reservoir with deep burial, poor reservoir properties, poor seepage capacity and severe heterogeneity. The production declined rapidly during water injection development process, and the absorption capacity of the injection well is poor. Some production wells are not affected by the injection wells. In order to improve the effect of water injection development, it is necessary to infill the existing well pattern, reduce the injection-production well spacing, and establish an effective driving system for the reservoir to improve the reserves utilization. This paper classifies the effect of water injection development in foreign TM oilfield, establishes the relationship between injection-production well spacing and formation permeability, and then obtains the effective driving well spacing under different permeability of ultra-low permeability reservoirs. This method plays an important role in the study of well pattern deployment in the water injection development process of ultra-low permeability reservoir.
Study on the Impacts of Land Consolidation Project on Soil Quality
Authors: He Lirong
Published: November 2019

Taking Sunjiacha Town, Shenmu City, Shaanxi Province as an example, the nutrient characteristics and physical and chemical properties of soil samples were studied and analysed. The results showed that the soil pH of X001 sample was the lowest, 7.7, and the total salt content of X002 sample was the highest, which was 1.3 g.kg-, while that of X008 sample was the highest, which was 32.85 mg.kg-. The highest content of soil organic matter was 84.3 mg kg-, the highest content of total nitrogen was 1.75 g kg-, the highest content of available phosphorus was 7.4 mg kg-, and the highest content of available potassium was 103 mg kg-. According to the National Classification Table of Soil Nutrient Content, the soil texture in the study area is sandy, pH is alkaline, available phosphorus and available potassium are deficient or extremely deficient. Except for the rich organic matter and total nitrogen in the black clay layer, the organic matter and total nitrogen in other layers are extremely deficient.
Study on the absorption effect of hydrolyzed hoof horn powder on cadmium ions
Authors: Chen Hongbing , Li Yadong , Deng Meie , Lu Jindeng
Published: November 2019

Animal hoof horn has complex porous structure and rich keratin, crushed and sieved, adding 5% KOH in the quality of the hoof horn powder, and mixing at 1:5 ratio of solid to liquid, adding water at 121 °C, Hydrolysis at 2 atmospheric pressure for 5 hours, the horn powder was completely hydrolyzed into the hydrolysis products containing sulfhydryl and disulfide bonds, the hydrolysates of the powder were added into 50mg•L−1, 2.0mg•L−1 cadmium Ion solution, centrifuged for 17h and then centrifuged to detect the residual cadmium ions. The results showed that the best particle size was treated with 100 mesh fine mesh powder, the lowest residual Cd2+ concentration in the solution was over 75%, and the high concentration 50mg•L−1 was the best, the residual amount of Cd2+ was 14.887mg•L−1, the removal rate was 70.24%. The adsorption effect of the hydrolyzate of Hoof horn powder on cadmium ion solution with concentration of 2.0 mg•L−1 However, the effect was not significant. When the dosage reached 30ml, the residual amount of Cd2+ was reduced to 1.238mg•L−1 and the removal rate was 38.10%.
Analysis and Influence of Salt Content on Stability of Saline Soil Subgrade Slope
Authors: Zhang Yang , Qu Zhenpeng , Yang Lixia
Published: November 2019

In order to determine the stability of the subgrade of the saline soil subgrade under different salt contents in the cold region. Two soil samples were selected to determine the salt content and mechanical parameters, and then the Slide software was used to analyze the stability of subgrade slope. The results show that the less the salt content, the greater the shear strength of the soil and the higher the stability of the subgrade slope.
Based-estimated volatility Real Option evaluation method in drilling exploration and development
Authors: Yin Huimin
Published: November 2019

Oil and gas field development are characterized by high risks and uncertainties, thus making relevant risk evaluation is an essential decision to reduce development losses. On the basis of comprehensive analysis of traditional evaluation methods, combined with a gas field development example, the Real Option method is used to break through the “static” evaluation of the Net Present Value of traditional assessment, and the uncertainty factor is taken as an active impact factor, which the bigger to may excavate greater result. The benefits are calculated by numerical simulation using Monte Carlo Simulation method to establish a Real Option model based on volatility estimation. The evaluation results show that the Monte Carlo Simulation uses the correlation between the indicators to establish a Net Present Value model, which can comprehensively consider a variety of factors, and can also obtain the corresponding cumulative probability. The results are more objective and more realistic, and more reasonable evaluation.
Research on Grab Swing Control Method Based on Time Delay Filter
Authors: Zhang Zhaowen , Jiang Huilue , Du Dawei
Published: November 2019

Grab swing during crane acceleration and deceleration will have an impact on work efficiency and safety. In this regard, the swing amplitude of the grab during the operation must be controlled within a certain range. According to the mechanical analysis of bridge crane’s grab, the mathematical model between crane’s horizontal movement and grab swing is established. A time delay filter technique is applied to shape the acceleration control signal, thus effectively control the swing angle of the grab. Simulation results show that the control method with time delay filter could eliminate the swing of the grab even without measuring the swing angle, and is feasible for engineering applications.
Design and test of slope monitoring digital inclinometer
Authors: Huang He , Lu Hui , Yan Zongling , Zhang Xiaosong , Tan Ling , Mao Youping
Published: November 2019

According to the functional requirements of the slope monitoring system, the angle sensor is taken as the research object, and the digital inclinometer suitable for slope monitoring is developed. The software and hardware design, data error correction, data transmission protocol and external structure design of the inclinometer are mainly solved. At the same time, the joint adjustment, installation and operation and maintenance of the slope monitoring system are completed.
Slope geological monitoring system based on wireless sensor transmission protocol research
Authors: Huang He , Lei Ming , Zhang Xiaosong , Yan Zongling , Du Mengqin , Xu Feng
Published: November 2019

With the continuous development of modernization in the central and western regions, the construction speed of the Panshan Highway has accelerated, and a large number of slopes have been formed. In order to ensure the safety of road vehicles in Laoshan District, it is necessary to monitor the safety of dangerous slopes, so it is essential to establish a complete slope geological monitoring system. Based on the development of wireless sensor network technology, the key technology of wireless sensor network technology based on slope monitoring system is studied, and a simple and effective wireless sensor network protocol is designed. The protocol architecture is divided into four layers, of which the link layer is mainly based on the IEEE802.15.4 protocol technology. The routing layer is mainly based on DSR technology, but it proposes a new method to solve routing loop problems, and designs a cooperative working mode of link protocol and routing protocol. Slope geology based on the agreement. The monitoring system is well monitored for the safety of dangerous slope geology.
A new exchange flow computational method of quasi-one-dimensional flow between matrix and fractures in Fractured Reservoirs
Authors: Zheng Huan , Shi Anfeng , Wang Xiaohong
Published: November 2019

Natural fractured reservoirs exist widely in the world. The heterogeneous porous medium was idealized to be a uniform system of the fracture and matrix for the convenience of numerical simulation. The traditional method to describe the flow exchange between the matrix and fracture is using a function related to shape factor and the pressure difference between the matrix and fracture. However, this classical model cannot be applied for the incompressible fluid. A new exchange flow computational method between matrix and fractures of quasi-one-dimensional flow in fractured reservoirs is proposed in this article. Numerical simulations are performed to demonstrate that the proposed method can provide more accurate results.
Determination and Analysis of polycyclic aromatic hydrocarbons (PAHs) in Building Dust Fine particles (PM2.5)
Authors: Liu Yuanyuan
Published: November 2019

Based on construction of dust particles extraction of polycyclic aromatic hydrocarbons in the optimized analysis, to determine the optimal experimental conditions of ultrasonic extraction of polycyclic aromatic hydrocarbons; Determination of polycyclic aromatic hydrocarbons are normalized concentration analysis, Phenanthrene (PhA) was the highest, accounting for 29.1% of the total PAHs, followed by Naphthalene (NaP) 18.9%, Benzo[b] fluorathene (BbF) 13.1%, Pyrene (Pyr) 8.2%; building the dust PM2.5 fine particles of polycyclic aromatic hydrocarbons the source component spectrum, provide analysis data for the control and management of pollution sources.
Study on the Changes and Influencing Factors of Industrial Carbon Emission in Beijing-Tianjin-Hebei Region
Authors: Yuan Qingming , Zhang Baorong
Published: November 2019

Aiming at the characteristics of industrial carbon dioxide emissions in the Beijing-Tianjin-Hebei region in the past decade, the relationship between carbon dioxide emission intensity and socio-economic impact factors in various regions was studied by co-integration test. The study found that there is a long-term equilibrium relationship between carbon dioxide emission intensity in the Beijing-Tianjin-Hebei region and industrial scale, industrial structure, and energy structure. From the data of the past ten years, the industrial structure will be a long-term factor affecting the industrial carbon emissions of Beijing-Tianjin-Hebei.
Effects of application of nitrogen, phosphorus and potassium on soil fertility and enzyme activities of pear jujube under straw mulching
Authors: Ye Shenglan , Peng Biao
Published: November 2019

In this experiment, the effects of different fertilization treatments on soil nutrient content and enzyme activity under straw mulching conditions were studied by using the soil of jujube garden for 4 consecutive years. The results showed that different fertilization treatments significantly improved the soil fertility of the pear jujube garden in the loess hilly region. In the vertical section of the soil, the soil organic matter content decreased with the increase of soil depth, showing 0∼20 cm>20∼40 cm>40∼60 cm. And the total nitrogen content ofN3P3K1 was the highest at 40∼60 cm, which was 0.28 g/kg, which was 47.4% higher than that of CK. The available phosphorus content of N3P3K1 treatment was higher than other treatments at 20∼40 and 40∼60 cm, and its content was 4.4 and 3.6 g/kg. Different fertilization treatments affected soil enzyme activities. The urease activity of N3P3K1 treatment was 299.27 μg/g, which was 88.2% higher than that of CK. The effect of single application of phosphate fertilizer was the most significant, 54.17 μg/g, which was 98.1% higher than that of CK. Comprehensive analysis N3P3K1 treatment can more effectively improve soil fertility, improves soil enzyme activity, and is conducive to planting and producing pear dates.
Spatial and Temporal Patterns of Wetlands in Hebei Province
Authors: Wang Qian , Li Jinlu , Liang Zhongya
Published: November 2019

Wetland is an important part of the ecosystem and important research subject in global environmental change and sustainable development. This study parents a wetland analysis of Hebei Province in China for the period from 2009 to 2017, on the basis data statistics and GIS technology. The results show that, wetland area decreased from 27.0×104 hm2 to 24.0 ×104 hm2, decreased of 3853.42 hm2 with an average annual, decreased rate 0.7%-2.4%. The structure of costal shoal, inland shoal and marshland remained at 0.36:0.60:0.04 level. The transition between wetland and other types of land were calculated by Matrix Model of Land Transfer. The results show that the wetland area mainly from cultivated land, water -water conservancy facilities land and woodland, mainly converted to urban industrial land and transportation land. The characteristics of spatial and temporal pattern change is significant. where wetlands have declined dramatically are concentrated in four areas. They are District of Bashang Plateau-Yanshan Mountain northern, District of Qin-Tang-Cang coastal city, Central plain of the province, Southwest of the province respectively.
Research on Land Development Intensity Control Based on GIS Multi-Dimensional Model
Authors: Luo Jing
Published: November 2019

This paper takes the central city of Malone as an example to establish a basic database of GIS and construct an urban land development intensity control system. Research on the introduction of land mass potential, economic benefits, human settlements and other factors, from different dimensions to establish a benefit model, economic model, environmental model, comprehensive determination of the study area control intensity indicators. The conclusion shows that the area with high strength F of grid unit development is located in the south of Malong Old Town, the most part of the east-west main road and the adjacent areas in the east and west. From the overall F-value spatial distribution, the development intensity of the southwest is suitable for a higher floor area ratio (FAR). Secondly, the development intensity of the northwestern region is suitable for a relatively low construction floor area ratio (FAR).
Numerical Calculation of Pipe-soil interaction Subjected to Unstable Slope
Authors: Han Bing , Fu Qiang
Published: November 2019

The integrity of oil and gas pipelines is seriously impacted by unstable slopes in tough terrain in western China. The quantitative evaluation technology is an effective method for pipelines risk management under the threat of geohazard. In order to establish the pipeline vulnerability evaluation indexes under effect of unstable slope, the finite element method is adopted to simulate unstable slope movement, pipeline mechanical behavior and pipe-soil interaction by changing geometrical sizes and mechanical characteristics of them, such as the material composition of unstable slope, movement type of unstable slope, diameter and wall thickness pipelines. The regularity for change of stresses and deformations of pipeline subjected to unstable slope can be obtained by means of numerical calculation.
Heterogeneity evaluation method for double-high stage of fault block reservoir and its application
Authors: He Shumei , Zhang Jialiang , Feng Guojun , Cheng Qi , Huang Fang , Wei Pengpeng , Zhou Jian , Liu Tongjing
Published: November 2019

The study of reservoirs’ macro-heterogeneity is one of the important research contents of secondary development and tertiary oil recovery in high water cut period reservoirs. The GX oilfield is a terrestrial sedimentary fault block reservoir. In the development area, there main develop structure reservoir, and the faults are developed intricately. Due to the combined effects of sedimentary environment, diagenesis and tectonism, the heterogeneity of reservoir plane and longitudinal are extremely strong, and the geological characteristics and development effects of different development units in the same interval are great different. In this paper, the GX1 fault block is taken as an example. The thickness of the reservoir, the geometry of the oil layer and the uneven distribution of the permeability are considered on the plane. The overlap of the sand body, the interlayer and the intra-layer permeability difference are considered on the longitudinal direction. Through the conduct research on the well pairs that have established the corresponding relationship between injection and production, regarding the quantitative results of the seepage capability between wells as basis, also considering the characteristics of stage development, to carry out the time-varying of heterogeneous and the target block’s seepage capacity from the dynamic point of view. The research provides scientific support for the secondary development adjustment, tertiary oil recovery design and “two-three combination” enhanced oil recovery technology research to GX oilfield.
Study on the Influence of Pulping Process on Rheological Properties of Coal Water Slurry
Authors: Ge Lei , Li Junguo
Published: November 2019

The fluidity of the coal water slurry during transportation, the stability during storage, and the combustion characteristics during atomization combustion have a great relationship with the rheological properties of the coal water slurry. In this chapter, the zwitterionic humic acid graft copolymer coal water slurry dispersing agent HSC and anionic humic acid graft copolymer dispersing agent HS were used to prepare Binchang coal water slurry. Dispersing agent, pulping concentration and temperature were discussed. The effect on the rheological properties of coal water slurry. The result shows that the coal water slurry made by HSC and HS with graft structure has obvious yielding pseudoplastic fluid characteristics, while the NSF and HA coal water slurry show slight yielding pseudoplastic fluid characteristics. With the increase of pulping concentration, water coal the apparent viscosity, yield stress and flow coefficient of the pulp show an increasing trend. The greater the pulping concentration, the flow characteristics of the coal water slurry will develop to the yielding plastic fluid; for the pulp made by HSC, when the pulping concentration At 67 wt%, the slurry exhibited a slight yielding plastic fluid characteristic. For the HS slurry, when the pulping concentration was 68 wt%, the slurry exhibited a slight expansion plasticity characteristic. At 25 ° C, the fluid model of the coal water slurry yields a pseudoplastic fluid, after which the elevated temperature can weaken the yield pseudoplastic properties of the slurry and cause the slurry to transform into a plastic fluid.
Application of binary compound water control technology in the development of horizontal wells in offshore oil fields
Authors: Liu Yigang , Zhang Yunbao , Xue Baoqing , Lu Yikuan , Wang Jia , Zhou Jian , Liu Tongjing
Published: November 2019

Offshore A oil field is a typical bottom water reservoir with thin thickness of oil layer and large thickness ratio of water layer and oil layer. Due to its strong bottom water energy, serious non-homogenous and the impact of the bottom ridge, most of the horizontal well production segment is seriously water out.Based on interaction relationship between horizontal segment trajectory and oil and-water interface, the distribution and contrast of permeability along horizontal segment and the comprehensive analysis of production performance, this paper combines the characteristics of the residual oil distribution of typical wells and the mechanism of dual compound oil addition, and from the perspective of combining theory with the field creatively put forward the dual composite water control mode of first injecting gel segment plug and then injecting foam. then completed the design of dual compound water control mode and dosage of the typical well. After processing water control measures, the production data shows that the water content decreased significantly after opening the well, from 95.1% before water control to 80%, which was 15% lower. Also the oil production rate has a significant increase from 2.3t/d before water control to maximum to 9t/d after implementing control measures and cumulative oil increase is 550t with effective period of 135 days. The effect of oil and precipitation is obvious.
Simulation of acoustic wave equation in viscoelastic media by ONADM method
Authors: Huang Rong , Wang Zhiliang
Published: November 2019

The propagation of acoustic wave in viscoelastic media is of extremely important in seismic exploration, seismology and so on. This paper propose a novel difference scheme for acoustic wave equation in viscoelastic media simulation, named Optimal approximate analytic discretization method (ONADM). This is a new method which can suppress numerical dispersion effectively in larger space step in recent years. The purpose of this paper is to study the propagation of acoustic wave in viscoelastic media by using ONADM method. Finally, The numerical results demonstrate that the ONAD method for acoustic wave equation in viscoelastic media has obvious advantages.
Research on the influence of cross mining on advance support technology of overburden roadway
Authors: Yuan Benqing
Published: November 2019

70%∼80% of the roadway is affected by mining, the most prominent problem is roadway maintenance under the influence of cross-mining. In this paper, the support of a rock backwind roadway in the east NO.4 mining area of a coal mine in huai-nan mining area is studied under the influence of mining in the lower 11-2 coal seam, The comprehensive support method of hollow grouting anchor cable anchoring and block erection is developed, and has carried on the successful application in the practice.
Research progress on migration and accretion of Nadanhada terrane
Authors: Qu Guohui , Liu Ning , Meng Yuanlin , Li Xiunan
Published: November 2019

The Nadanhada terrane is the most developed area of Mesozoic marine strata in eastern China. The migration process of the Nadanhada terrane is restored from two aspects of Palaeomagnetism and biopalaeogeography. It is concluded that the subduction of the oceanic plate to the continental margin of East Asia is accompanied by the strong deformation of the sedimentary cover during the growth of the Nadanhada terrane. Under the continuous compressive force generated by the subduction of the oceanic plate to the continental margin of East Asia, accretionary wedges continue to form in the direction of oceanic basin. At the same time, large detachment planes gradually form between accretionary complex and the basement of the Jiamusi massif. The evolution history of the Nadanhada terrane can be divided into five stages: the drift stage, the accretion stage of the continental margin, the bending stage of the terrane structural line, the compression stage of the terrane and the anticlockwise rotation stage of the terrane. Bijin terrane can be seen as the extension of Nadanhada terrane in NNE direction.
Advances in tectonic genesis of Nadanhada terrane
Authors: Qu Guohui , Liu Ning , Meng Yuanlin , Li Xiunan
Published: November 2019

The Nadanhada terrain is the most typical terrain in Northeast China. It is located on the West Bank of the Wusuli River in the east of Heilongjiang Province. The division of tectonic units in Nadanhada area includes five stages: geosynclinal fold zone, Mesozoic subduction zone around the Pacific Ocean, back-arc marginal sea, orogenic belt and terrain formed by the closure of forearc basin, and so on. During the Mesozoic, the northeastern China was affected by the Mongolia-Okhotsk Ocean closure and the subduction of the Paleo-Pacific Ocean, and a large-scale tectono-magmatic activity took place. At the same time, the Nadanhada terrane drifted from low latitudes and eventually grew on the eastern side of the Jiamusi massif. Therefore, the Nadanhada terrane was formed in an oceanic environment. During the Mesozoic, it was situated on the continental margin of East Asia and formed terrigenous turbidite at the trench. At the same time, it underwent continuous subduction and local accretion, and finally formed a complete sedimentary sequence including oceanic siliceous rocks and terrigenous melanges. The direction of the tectonic line of the Nadanhada terrane changes from north to south, from NNE to NNW, and then to NW, showing an arc structure protruding westward. The direction of the present tectonic line can not represent the direction of its formation. It is the direction after the transformation of Dunmi fault left-lateral strike-slip activity and Sikhot-Alin region whole rotation.
Research and Analysis on the Change Characteristics of the Driving State of Low-Molecular Polymers in Three Types of Oil Layers
Authors: Li Xuefeng
Published: November 2019

Daqing Oilfield Co., Ltd. passed the oil field test in Zone A of the company area on the three types of oil layers with effective thickness less than 0.5m and permeability less than 0.050 μ m2. After the company’s oil production area in Block A has been injected for more than 6 years, it has been found that the method has achieved good oil and precipitation effects. This paper analyzes the dynamic characteristics of injection wells and production wells after injection, and compares with the first and second types of oil layers, and summarizes the variation rules of low-segregation driving states of the three types of oil layers, which is important for guiding the development of the three types of oil layers in the future. significance.
Application of research based on fine geology in oilfield development
Authors: He Jinbao
Published: November 2019

As the oilfield development enters a high water-bearing stage, the water content of the main oil layer gradually increases, the inefficient and ineffective circulation is serious, and the remaining oil distribution is scattered. It is difficult to select the well and reservoir. Through comprehensive development of high-density 3D seismic work, the study area further elaborates the sedimentary microfacies of the reservoir, making the development of the reservoir and the connectivity between the oil and water wells clearer. At the same time, applying the well-seismic combination technology to the fault Understanding, further clarifying the relationship between injection and production, the understanding of the underground situation is becoming more and more clear. Based on the comparison and application of the fine geological research results in the study area, this paper expounds the role of fine geological research results in the remaining oil potential tapping in the extra high water cut period.
Soil parameters inversion and influence based on MIDAS GTS
Authors: Sun Zoning , Liu Tao , Ma Shuo
Published: November 2019

The foundation pit engineering design is continuously optimized and improved. With the development of scientific computing, especially the finite element analysis software technology in the popularization of soil parameter inversion, it provides a new technical approach. Midas GTS was developed to quickly complete the analysis and design of geotechnical and tunnel structures. It provides a variety of theoretical analysis and design functions, as well as a variety of constitutive and user-defined constitutive models to properly analyze the safety of foundation pit design. has become an important method for obtaining effective parameters in recent years.
Groundwater storage changes for 35 basins over MENA domain using GRACE during the period 2003-2017
Authors: Eltahan Muhammed , Alahmadi Sabah
Published: November 2019

Change of water storage over Middle East and North Africa (MENA) domain is presented during the period 2003-2017 using satellite data which is provided by the space mission, Gravity Recovery and Climate Experiment (GRACE). Thirty-five basins over MENA domain are selected. Fourteen basins showed positive trend (increase) in water storage while the remaining basins showed negative trend (decrease) in the water storage. Our analysis revealed that most of the basins near the equator had positive trend (increase in storage) in groundwater changes in addition to showing periodic (increasing and decreasing) change. Volta basin highest monitored groundwater storage with 24.5cm within year 2010. On other hand, basin CHAASBasin174 has the lowest negative water storage by 20.5cm during year 2015.
Geologic feature and tectonic evolution in the South Yellow Sea
Authors: Xing Tao , Chen Hongwen , Chen Xi , Yang Li
Published: November 2019

South Yellow Sea is mainly located on the Yangtze platform, which is a sequence residual basin that has been migrated and superimposed since the late Proterozoic, and has been transformed many times to make the original appearance incomplete. South Yellow Sea Basin has a complex process of formation and evolution. South Yellow Sea has the characteristics of north-south block and east-west zoning. The fault is dominated by the direction of NEE, NE and NW. The fault zone has large extension length and staggered structures in all directions, which is featured by multi-type and multi-order. The main magmatic rocks in the South Yellow Sea are Yanshan period magmatic rock, and the distribution of rock mass is controlled by NE fracture, and has the characteristics of multi-stage activities with large and frequent strength. Since its formation, the South Yellow Sea region has experienced six tectonic movements, among which Yizheng Movement, the First Act of Wubao Movement, and Sanduo Movement are three major tectonic movements. The structural relationship and interaction between the Sino-Korean Block and Yangtze Block as well as Yangtze Block and South China Block, would provide important insights to the formation and evolution process of South Yellow Sea Basin, and the activity of Eurasian plate and the interaction between the surrounding plates.