bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on Development Characteristics of Low Permeability Oil-water Horizontal Well Area in the Same Layer
Authors: Wang Ning 
Published: February 2021

Abstract
According to the development practice of horizontal wells in Putaohua reservoir of low permeability oil-water block, this paper summarizes the development characteristics of the block. At the initial stage of production, the chloride ion value of the near-wellbore formation (i.e., the fluid produced at the initial stage of production) is corrected for the large-scale fractured horizontal wells according to the fracturing fluid that is not returned, so as to judge the water breakthrough property of high water-bearing wells. After putting into production, it is found that the formation water in the block is affected by structure and lithology respectively. The water injection policies of “strengthening water injection at high position and restraining water injection at low position” and “strengthening water injection at main layer and restraining water injection at communication layer” are adopted to restrain formation water energy from plane and interlayer and reduce water cut in horizontal wells. Based on the theoretical analysis of fracture effect and water breakthrough characteristics of horizontal wells, the theoretical water breakthrough strength and theoretical hydraulic conductivity strength of fractures are calculated respectively, and the chart is drawn. According to the chart, the adjustment idea of “classification cycle water injection, zonal determination of parameters” is implemented, so that the determination of cycle water injection parameters is changed from “fixed strength, fixed cycle water quantity” to “fixed water quantity, fixed cycle water strength”, and further improved The improvement of water injection policy can provide reference for the development characteristics research and water injection adjustment of horizontal wells in the same type of oilfield in the future.
Research on Reasonable Drilling Parameters of Hydraulic Reaming in Soft and Thick Coal Seam and Its Application in Field
Authors: Li Shengzhou 
Published: February 2021

Abstract
In view of the fact that the outburst disaster of the soft 3# coal seam in the Sangshuping Coal Mine is mainly caused by in-situ stress, it is proposed to use hydraulic reaming, pressure relief and anti-reflection technology to remove some of the high geostress in the coal seam and improve gas drainage efficiency. Numerical simulation software was used to analyze the distribution of plastic failure and stress distribution of the coal body after reaming under the three-hole spacings of 4m, 6m, and 8m. The results show that the radius of the plastic failure zone around the borehole is about 2.2m when the rate of expanded coal chips is 3%; the width of the pressure relief area of a single reamed hole is about 3.2m. When the drilling hole spacing is 6m, it has a good pressure relief effect and reasonable amount of drilling work. After the reaming, the drainage concentration and flow rate are both improved. After reaming, the extraction concentration and flow rate have been improved. The hydraulic reaming technology can effectively solve the problem of outburst prevention in the thick seam of soft outburst dominated by ground stress in Sangshuping Coal Mine.
Discussion on comprehensive adjustment technology of weak alkali ASP flooding in stage development of second-class reservoir
Authors: Zhu Yueyan 
Published: February 2021

Abstract
The application of ASP flooding development by stages and comprehensive adjustment technology plays a very important role in the development of the second-class reservoir, which is directly related to the development effect of the second-class reservoir and also improves the development effect of the reservoir to a certain extent. In this paper, the author analyzes and studies the comprehensive adjustment technology of ASP flooding in different stages. Taking SD block as an example, the development of the second-class reservoir is expounded, and the weak alkali ASP flooding technology is applied in different stages of the development of the second-class reservoir in SD block.
Application of water drive characteristic curve in oil field development planning index prediction
Authors: Liu Baolai 
Published: February 2021

Abstract
In the prediction of water drive development index in oilfield development planning, we often use constant liquid method to calculate production, injection-production balance prediction, water drive characteristic curve and exponential decline. At different development stages, various forecasting methods are constantly improving. However, after oilfield development enters the declining stage, many forecasting methods are no longer suitable for the current development index prediction. However, there is a certain correlation among all kinds of forecasting methods. To a certain extent, it can make up for their own shortcomings to predict various development indicators through the joint solution of parameters among different forecasting methods, which has good practicability in the prediction of development indicators in oilfield development planning.
Theoretical Analysis of Proppant Embedment and Fracture Conductivity in Fractured Reservoir
Authors: Wan Youyu , Hou Tengfei , Cheng Changkun , Lin Hai , Yang Xiangtong , Liu Shiduo , Xiong Tingsong , Zhang Yang , Ye Yu , Feng Xinyuan 
Published: February 2021

Abstract
Proppant embedment mainly accounts for diminishing fracture aperture and conductivity. The conductivity decrease could greatly restrict fluid flow, thereby affecting the well performance. In this paper, new mathematical models are derived to calculate the proppant embedment and fracture conductivity after hydraulic fracturing. These models take three crucial factors into consideration, including proppant instantaneous elastic deformation, the conductivity change over time, and effective fracture geometry and corresponding proppants amount. Fitting correction is performed for the new theoretical model based on the experimental data. The results show that the theoretical model proposed matches well with the experimental data. The fracture conductivity is in proportion to proppant viscosity, elastic modulus of proppant and in inverse proportion to closure pressure, while elastic modulus of rock and large value of formation rock viscosity have slight impact on fracture conductivity. Moreover, with the increase of proppant viscosity, it takes longer for the conductivity to come to the steady state. These new mathematical models can provide some insights for proppant size selection and sand ratio optimization of fracturing treatment, and it is also a good method to predict the proppant embedment and the fracture conductivity.
Analysis of Water Resources Change and Water Use Structure in Shaanxi Province
Authors: Liu Zhe , Cao Shiliu 
Published: February 2021

Abstract
This article analyzes the changes in water resources, water consumption, and water structure in Shaanxi Province, China from 2004 to 2018, based on the water resources bulletin data of Shaanxi Province. The results show that the inter-annual differences in the amount of water resources in Shaanxi Province in the past 15 years are obvious, and the change process of the amount of surface water resources is basically the same as that of the total amount of water resources. The amount of water resources varies greatly around 2012; the total amount of water used in Shaanxi Province and various types of water consumption have shown a significant upward trend. Among all types of water consumption, agricultural water consumption has the largest increase, with a linear trend rate of 38 million m3/a. The proportion of agricultural water used in various types of water shows a significant downward trend, and the proportion of domestic water and ecological water shows a significant upward trend.
Synthesis and evaluation of new slickwater fracturing fluid for drag reduction
Authors: Guo Hao 
Published: February 2021

Abstract
Currently, slip water fracturing fluid is widely used as a fracturing fluid for shale reservoirs. Non-ionic hydrophobic modified polyacrylamide (HM-PAM), partially hydrolyzed water-soluble hydrophobic associating polyacrylamide (HMWSP) and partially hydrolyzed anionic polyacrylamide (HPAM) solutions were modeled by molecular simulation software Materials Studio. The radius of gyration (Rg) and mean square displacement (MSD) of HPAM and HMWSP at different NaCl concentrations were calculated. From the simulation results, compared with HPAM and HM-PAM, HMWSP had a larger radius of gyration, a larger intrinsic viscosity number, and a larger hydrodynamic size, which would produce better drag reduction effects. Using acrylamide (AM), acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid (AMPS) as basic raw materials, a hydrophobic associative drag reducer (HMWSP) was prepared by an inverse emulsion method. Infrared spectroscopy (FIIR) was used to characterize the synthesized products, and fluorescence chromatography was used to test the association of polymer solutions. Using a friction tester to test the drag reduction performance of the drag reducer, HMWSP has good resistance to salt reduction. HMWSP had good resistance reducing salt performance.
Application of the large-diameter and extra-long rotary bored pile in the thick sand layer area
Authors: Liu Wenbin 
Published: February 2021

Abstract
The large-diameter and extra-long rotary bored pile is a common foundation used in civil structures, while the sand layer may influence the quality of the rotary bored pile. This paper analysed the forming of the rotary bored pile in the sand layer based on an engineering case. The testing data of the practical pile forming process were recorded, and the difficulties and key points are highlighted to provide experience for other cases.
Research on Profile Control Technology of Chengdao Oilfield
Authors: Qi Yuanqiu , Li Mingzhong , Bai Zhifeng 
Published: February 2021

Abstract
Chengdao Oilfield in Shengli was seriously submerged at the later stage of waterflood development, and its water content reached 85%. In view of the high water content of Chengdao Oilfield and the prominent contradictions with reservoirs, this paper studies the difficulties existing in offshore oilfield profile control and the profile control agent system for Chengdao Oilfield history. At the same time, the profile control effects of YG103 gel system, HST gel system, self-crosslinking gel system and DQG gel system used for profile control of Chengdao Oilfield were evaluated. According to the statistical data, the average production increment of YG103 jelly system per well group is 2137.8t, HST-1 jelly system per well group is 1924t, self-crosslinking jelly system per well group is 526t, DQG jelly system per well group is 182t. This paper analyzes the reasons why the profile control and production increasing effect of Chengdao Oilfield gradually becomes worse. Based on the research results, suggestions for improvement were put forward.
Evaluation model of coal mine emergency rescue resource allocation based on weight optimization TOPSIS method
Authors: Li Xiao , Shi Yongkui , Pang Chuming , Li Huitong , Lin Jiahui 
Published: February 2021

Abstract
In order to solve the problems of unreasonable allocation and low efficiency of emergency rescue resources in coal mine accidents, it is necessary to establish a coal mine emergency rescue resource allocation model by using comprehensive weight-approximation ideal solution (TOPSIS method).This paper takes rock burst in a coal mine as an example by extending this designed emergency rescue plan. Firstly, calculated the weight of the evaluation index affecting the emergency rescue is selected by AHP method and entropy weight method respectively. Then weight optimization is inspired by comprehensive weight method. Finally, the optimal scheme is selected by TOPSIS method, and the model is verified by AHP method approaching ideal solution and entropy weight method approaching ideal solution. The results shows that: (1) There are two influencing factors have great effect on the evaluation of coal mine emergency rescue model, which are rescue time and advance of rescue channel; (2) The optimal scheme is program 5 through comprehensive weight approaching ideal solution, which is consistent with the actual situation of the project, indicating that the model has high reliability.
Study on Outburst Risk Prediction Sensitivity Indexes and Its Critical Value of the Stress-dominated Outburst Coal Seam
Authors: Liu Jun , Li Shengzhou 
Published: February 2021

Abstract
According to that outburst in the mining area is the dominant stress type and they occur near the geological structure, taking Sangshuping NO.2 coal mine as the research background, the drilling cuttings weight S, gas desorption index of drilling cuttings Δh2&K1 in the investigated area were statistically analysed by combining laboratory analysis with field investigation. The study determines that the sensitive indexes of outburst risk prediction in NO.3 coal seam working face are the drilling cuttings weight S and gas desorption index of drilling cuttings Δh2; the critical values of normal and abnormal geological conditions are determined, which provides basis for prediction of No.3 coal seam working face in test area.
Analysis of Environmental Sustainability by Causal Loop Diagram and System Dynamic Model - A Case of the Great Barrier Reef
Authors: Ding Runze 
Published: February 2021

Abstract
The booming tourism industry has always played a vital role in the Australian economy. However, with the influx of tourists, the ecological environment of many scenic spots has been destroyed. As one of the typical areas in Australia, the Great Barrier Reef is suffering an increasing number of coral death due to natural disasters and man-made destruction. This study identifies the key variables and estimates the data collected from multiple channels, through building causal loop diagrams and system dynamic model to specifies the logic relationship between different variables and impact factors, and then further quantify their effects and analyze the interplay of them to clarify how they affect the ecological environment and business development of the Great Barrier Reef. The running results of the system dynamic model are consistent with the actual situation of the Great Barrier Reef, it provides a tangible future prediction of the Great Barrier Reef and puts forward the point that if the governments fail to take effective intervention measures, the mortality rate of coral reefs will continue to increase until they disappear completely in a few decades.
Influence of Axial Magnetic Interference on Wellbore Position Uncertainty
Authors: Hu Degao , Liu Xiaowen , Diao Binbin , Jiang Chuang 
Published: February 2021

Abstract
Accompanied with the widespread application of complex wells such as cluster wells in the exploitation of oil and gas resources, it is becoming more and more important to reduce or accurately describe the size of the wellbore position uncertainty as much as possible. It is well known that axial magnetic interference affects azimuth measurement. In this paper, the correction method of axial magnetic interference in azimuth measurement and uncertainty ellipsoid calculation method considering axial magnetic interference correction are introduced, and the influence of axial magnetic interference correction on the position uncertainty of a horizontal well is analyzed through an example. The research shows that the influence of axial magnetic interference on wellbore position measurement error varies with measurement depth, and axial magnetic interference plays an increasing role in the influence of wellbore position measurement error. Therefore, well trajectory should be measured in an environment free of axial magnetic interference.
Research progress on recycling technology of waste lithium battery anode materials
Authors: Yang Hongyu 
Published: February 2021

Abstract
In this paper, three kinds of recycling technologies for automotive lithium battery anode materials at home and abroad are introduced, including thermal metallurgy, hydrometallurgy and bio metallurgy. By comparison, the wet process with acid leaching precipitation extraction process has low requirements for equipment and energy consumption, and high leaching efficiency, which is an excellent technology easily introduced in industry.
Research Progress of Sludge Pyrolysis Catalysts
Authors: Han Lei , Chong Faguo , Guo Zhiqiang , Wang Chao , Wu Zhibin , Yu Tao , Qu Chengtun 
Published: February 2021

Abstract
Sludge treatment has become one of the most important challenges in environmental protection. With the improvement of sludge treatment standards, the environmentally-friendly and efficient pyrolysis technology developed has a good development prospect. The addition of catalyst is one of the important conditions affecting sludge pyrolysis. This paper introduces the influence of different kinds of catalysts on pyrolysis, and summarizes their advantages and disadvantages.
Heat exchange analysis of thermoelectric conversion device of automobile exhaust
Authors: Chen Jing 
Published: February 2021

Abstract
With the development of economy, people’s living standard will be improved and the number of motor vehicles will continue to increase. Among them, automobile exhaust emissions take away a lot of heat, exhaust pollution is also aggravated. This not only accelerates the energy consumption, but also the environmental problems become increasingly prominent. Based on the analysis of thermoelectric effect, the thermoelectric device of engine exhaust is designed and its thermoelectric conversion efficiency is studied in this study, which provides a wide application prospect for saving fuel and reducing the thermal pollution to the environment.
Preparation and Properties of Hyaluronic Acid Hydrogel Modified by L-cysteine Hydrochloride
Authors: Guo Li , Chai Yunlei , Zhou Fengchao , Wang Peng 
Published: February 2021

Abstract
Hyaluronic acid (HA) was modified by L-cysteine hydrochloride using chemical cross-linking method with horseradish peroxidase as catalyst, and HA was cross-linked intermolecularly by hydrogen peroxide to obtain modified hyaluronic acid hydrogel. The properties of modified HA hydrogel, such as viscosity, whiteness, swelling degree, porosity, water retention, texturewere studied. The results showed that the viscosity, water retention capacity and hardness of the modified hydrogel increased, the swelling degree and porosity were reduced, and the hydrogel structure was dense by cross-linkage treatment.
Research on Power Battery recovery Mode of New Energy Electric vehicles in China under Circular economy
Authors: Hu Lidan , Wei Xiaomeng , Ma Jun 
Published: February 2021

Abstract
With the development of new energy vehicles, the demand for power batteries is increasing, and at the same time, the environmental problems are becoming more and more serious. Considering the current situation of reverse logistics of power battery recycling in China, there are still many problems to be solved. Combined with the background of current circular economy, this paper optimizes the reverse logistics network of power battery recovery, in order to establish a complete green recovery network and promote the active reverse logistics of power battery recycling. Good countermeasures are put forward which are helpful to the development of reverse logistics of power battery recovery.
Environmental change and suggestions for improving EIA technology of Industrial Park Planning
Authors: Huang Lihua 
Published: February 2021

Abstract
This paper analyzes the new development trend of China’s environmental situation, the new characteristics of environmental pollution and environmental risk in the park during the “14th five year plan”. And the new requirements of the environmental changes in the 14th five year plan for the park planning EIA technology. From the aspects of improving the technical system of planning environmental impact assessment, strengthening the circular economy and ecological technology, and studying the applicable prediction model, the paper puts forward the technical countermeasures of the park planning environmental impact assessment. In order to prevent and reduce the cumulative environmental pollution of the park and prevent the environmental risk of layout.
Research on the construction of conceptual hierarchical model based on air pollution
Authors: Zhai Xueying , Sun Yong , Ji Min 
Published: February 2021

Abstract
In recent years, the problem of air pollution has become more and more serious, attracting close attention of mankind. The ontology system is constructed for the semantics of related words of air pollution to realize the sharing and standardization of semantics. Humans’ comments on the air conditions of the living environment are taken as corpus, and words related to air pollution are extracted from the corpus text to construct the ontology of air pollution. Divide the levels according to the attributes of air pollutants, and build and enrich the ontology system. This paper builds an ontology model based on air pollutants, divides hierarchical structure on the basis of concepts.
Aquatic Ecological Risk Assessment of Surface Sediment Pahs in Beijiang River Basin
Authors: Jiang Yinhua , Zhang Hui , He Jiajun , Huan Ping 
Published: February 2021

Abstract
Beijiang River Basin is one of the main water source of the Pearl River Delta city group, but in recent years the aquatic ecological environment changed. Ecological risk assessment of polycyclic aromatic hydrocarbons (PAHs) in sediments is an important issue to protect the ecosystem. In the paper, 16 priority control polycyclic aromatic hydrocarbons (PAHs) in the surface sediment from Beijiang River in China were quantitatively determined by GC/MS. Monte Carlo simulation method was used to analyze the ecological risk probabilities of PAHs in the sediments. Results showed that the risks of 3 PAH species were in the order of pyrene > phenanthrene > benzo[a]anthracene, the concentration of 16 PAHs are medium both at at home and abroad.
Calculation and study on pollutant degradation coefficients of Qiantang River estuary
Authors: He Chengqi , Li Ruohua , Chen Hongying 
Published: February 2021

Abstract
Qiantang River Estuary is a typical macro-tidal estuary in China, with features of strong tidal and high sediment concentration. In order to figure out degradation characterization of the major pollutants of Qiantang River estuary, water samples were taken in Xinsha Island, Changansha Island and Wenyan. CODMn, TN and NH3-N were chosen as the main pollutions of the three cross sections. Pollutants concentration were measured in the laboratory for 20 consecutive days. And the pollutant degradation coefficients (hereinafter referred to as PDCs) were calculated. Considering excluding the nonbiodegradable component in the shore run, pollutant concentration decreased rapidly, which was in keeping with the first-order kinetics equation. The PDC of CODMn is 0.376 d−1, which was above average when comparing with other rivers in China. The PDCs of NH3-N and TN were below average, which were 0.395 d−1, 0.066 d−1. Meanwhile, NH3-N and TN are main pollutants exceeding the standard in Qiantang River.
Evaporation-Cooling Coupling Method to Remove the Calcium and Magnesium Impurities in Leaching Solution of Manganese Ore
Authors: Zhang Hui , Song Da , Zhang Qi , Huang Xiping 
Published: February 2021

Abstract
Calcium and magnesium impurities are the major impurities in the leaching solution of manganese ore, which will influence the produce of manganese sulfate. Solubility determinations of calcium sulfate, magnesium sulfate and manganese sulfate in water have been carried out from 273.15K to 373.15K. According to the basic data, a new method to remove Ca2+ and Mg2+ impuritis in leaching solution has been put forward. The removal ratios of calcium and magnesium impurities could reach 48.5% and 39.2% using the new method, respectively.