bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

AbstractIN 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.