bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of Identification Condition of Thin Layer Chromatography for Alpinia Katsumadai Hayata
Authors: Lv Lijuan , Wang Xiangpei , Wu Hongmei , Li Xiangmin , Zhong Ke 
Published: February 2021

Abstractobjective: To optimize the TLC identification conditions ofAlpinia katsumadaiHayata. Methods: Qualitative identification ofAlpinia katsumadai Hayatawas carried out by TLC, toluene: ethyl acetate: methanol (15: 4: 1) and toluene: ethyl acetate: methanol (14.5: 4.5: 1) were used as developing solvent, then observed under 365nm ultraviolet lamp. Results: The optimized conditions were better than those of TLC in 2020 edition of Chinese Pharmacopoeia. The optimized spots were more clear, the separating capacity was better, and the stability of the conditions was better. After optimization, there were 9 spots in TLC. Conclusion: The method is simple, specific and reproducible, which can provide reference for the quality control ofAlpinia katsumadaiHayata.
Asphalt Deck Pavement Design for Concrete Bridge under Frost Climate in the North Sea Region
Authors: Fu Jiancun , Wang Lin , Gai Guohui , Yang Fei 
Published: February 2021

Abstract
A prefered waterproofing system and bearing course mixtures for asphalt pavement deck were designed to determine a suitable waterproofing system and material/structure combination optimize proposal for Qingdao Bay Bridge, which was built under the frost climate of Shandong province, through a general analysis on the disease type and the damage mechanism of asphalt deck pavement. Based on the laboratory test results, the test section construction and long-term pavement performance observation, a comprehensive comparison and analysis about five types of waterproofing system(Synchronous Seal coat+ Asphalt Sand, Polymer Modified Bituminous Waterproofing Sheets, Priming Coat+Asphalt Rubber Membrance+Protection Board, Polymer Modified Emulsified Asphalt Waterproof coating, Gussasphalt)were made in terms of waterproof effect, workability, quality reliability and long-term performance. Furthermore, the asphalt deck pavement were proposed to be designed on the basis of the layer performance-related concept, and regarded as the system engineering. The construction effect indicates that both the multi-purpose layer (waterproofing high modulus asphalt sand) and the deck pavement structure are adapted to the evidence temperature difference and windy characteristics during the construction. It also shows the excellent workability and quality reliability.
Groundwater dynamic analysis of a typical small watershed in the Loess Plateau
Authors: Dong Qiguang , Li Na , He Jing , Zhang Panpan , Liu Zhe , Chang Min 
Published: February 2021

Abstract
After the implementation of the project of returning farmland to forest and ditching and rebuilding land in Yan’an area, the hydrological process in the basin has changed. In order to clarify the dynamic characteristics of groundwater, a typical Nanniwan basin was selected, and groundwater monitoring equipment was installed in the upstream, middle and downstream respectively. The dynamic changes of groundwater in the basin. The results show that among the annual precipitation in the small watershed of the Loess Plateau, June-August (summer) is the wet season, with the most concentrated precipitation, with a total precipitation of 451.8 mm, of which August has the largest precipitation; the groundwater depth gradually increases before September. After September, the upstream and downstream water levels begin to stabilize or rise; the upstream groundwater level fluctuates slightly; the shallow groundwater areas in the middle reaches have large fluctuations due to the large water users; the groundwater depths in the downstream areas are generally between the upstream and Between the middle reaches, the depth of burial showed a slight increase overall.
Study on Optimization of Compound Flocculant’s Purification Process of Sugarcane Juice
Authors: Wang Xiaoming , Li Dacheng , Wu Juxian , Shi Xiaoyan , Zhou Shaoji , Luo Xingxie 
Published: February 2021

Abstract
Sugarcane juice contains a lot of non-sugar organic impurities, and most of the non-sugar organic impurities are suspended in the sugarcane juice in the form of colloidal particles, making the juice turbid. Flocculant is an indispensable clarification aid in the cane juice cleaning process, and its use effect will directly affect the production cost of sugar cane sugar and the quality of white granulated sugar products. This paper is based on the sulfite process of sugar production. After the sulfur smoked juice is heated, the composite flocculant is mixed with the sugarcane juice and then settled. The clear juice is taken to determine the physical and chemical indicators, and the clarification effect of the composite flocculant is investigated. The response surface method is optimized to obtain the composite The best material ratio of the flocculant is PAM 1.70ppm, CTS 1.90ppm, diatomaceous earth 2.10ppm, and the compound flocculant with the best material ratio is used for the cane juice cleaning process experiment. The orthogonal test method optimizes the cane juice cleaning process as The cleaning effect is best when the added amount of phosphoric acid is 160 ul/L, the pre-ash pH value is 6.4, and the neutralization pH value is 7.4, the obtained clear juice is clear and bright, and the color value is low.
Analysis on Application of fracturing stimulation technology in Oilfield
Authors: Yu Junxiong , Xu Hongzhi , Liu Xiaopan 
Published: February 2021

Abstract
with the continuous progress of modern science and technology, in the process of oilfield production and operation, the traditional fracturing technology has been unable to adapt to the fracturing construction technology of modern oilfield. There are some problems in the construction safety, fracturing technology and environmental protection production in the construction process. Therefore, we should continue to explore the fracturing technology and develop new technology Technology is imperative, so as to meet the actual requirements of oilfield in different development stages.
Impact of the excavation and dewatering of the foundation pit on the stability of the plug-in steel cylinder
Authors: Liu Wenbin 
Published: February 2021

Abstract
The plug-in steel cylinders performance well in forming the bulkhead of the man-made island. In the late stage of the man-made island constructure period, the excavation and dewatering treatment will be conducted in the island, and these treatments may influence the stabilities of the steel cylinders. This paper analyzed the impact of the excavation and dewatering treatment on the steel cylinder based on an engineering case with numerical simulation method. And corresponding engineering treatments for preventing the local instability of the cylinders are proposed.
Description and Understanding of Complex Fault Block Reservoir Geology
Authors: Li Qiang 
Published: February 2021

Abstract
Reservoir description is an important step in oilfield development. Before mining, using various technical means to analyze and study oilfield structure can achieve the purpose of fully understanding the reservoir and provide theoretical basis for reservoir development. In this exploration, the background of description of complex fault block reservoir geology is analyzed, and X35 reservoir is selected as the research object to study the regional geological reservoir. By analyzing the fault distribution characteristics of X35 reservoir, the reservoir strata are divided. The three-dimensional (3D) geological model of the reservoir is established by using the method of facies-controlled modeling and numerical simulation. Finally, the 3D geological model is tested. The results show that the model has high accuracy and reflects the distribution of X35 reservoir, which has a certain guiding significance for the exploration and effective development of the remaining oil in the reservoirs distributed in this area.
Study on the prediction method of drilling tool deflection ability
Authors: Huan Huang 
Published: February 2021

Abstract
The build rate of the tools is a key point in trajectory control and prediction of horizontal well, which is based on the mechanical analysis and geometry analysis of tools. But if the tools have initial bending, the application of “beam-column theory” is limited. With a method of equivalent loading, this problem can be solved. Through the analysis of tools, the side force of bit can be calculated, and then a method, named “method of modified three-point fix Round” is used to determine the build rate of tools at the basis of VB program.
Safety classification and application of coal-rock gas compound dynamic disaster in coal mine
Authors: Dai Linchao 
Published: February 2021

Abstract
Coal and gas outburst, rockburst are the most serious dynamic disaster in the coal mine production. Based on the current situation of frequent occurrence of coal and gas outbursts and rock burst disasters in deep mines, the characteristic regularity and influencing factors of coal and gas outburst and rockburst disaster are analyzed. The safety grading evaluation system of coal-rock gas compound dynamic disaster is established. And the safety grading evaluation is carried out on the impact-outburst dynamic disaster of 32 production mines. The research results show that the influencing factors of the coal and gas outburst, rockburst disaster can be divided into natural factors, technical factors and management factors. Meanwhile, the safety classification of 32 production mines coal-rock gas compound dynamic disaster are mostly II level, in line with the actual situation.
Method for Potential Evaluation and Parameter Optimization for CO2-WAG in Low Permeability Reservoirs based on Machine Learning
Authors: Lv Wenfeng , Tian Weidong , Yang Yongzhi , Yang Jinghui , Dong Zhenzhen , Zhou Yongyi , Li Weirong 
Published: February 2021

Abstract
The CO2 water-alternating-gas flooding (CO2-WAG) is a key technology to improve the oil recovery of low permeability reservoirs. The effect of CO2 flooding to enhance the oil recovery is affected by geological conditions and production systems. The effect of CO2 flooding parameters on the enhanced recovery factor should be clarified to optimize the production system. In this paper, the machine learning algorithms are used to carry out the study and establish a set of procedures for optimizing CO2 flooding parameters based on the artificial neural network (ANN) and the particle swarm optimization (PSO) algorithm. Firstly, large amounts of basic data are generated by the Monte Carlo sampling method. Then, the recovery factor by the water flooding and the CO2-WAG and the enhanced recovery factor by CO2-WAG in different models are calculated in the reservoir numerical simulator. Moreover, the machine learning method is used to establish a neural network model, and analysis of the sensitivity of parameters of the enhanced oil recovery (EOR) is carried out by combining with the Sobol method. Finally, the neural network model and the particle swarm algorithm are combined to optimize the parameters of CO2-WAG flooding. The results show that the established model has a good prediction accuracy (97.6%), thus it could be used to predict the enhanced recovery factor by CO2-WAG, and it is applicable in potential evaluation of enhancing the oil recovery and optimization for parameters in the CO2-WAG well group.
An Experimental Research on Crack Propagation Regularity During Fracture Grouting
Authors: Cheng Shaozhen , Yang Fa , Dai Yuchen , Yang Zili , Shi Ye 
Published: February 2021

Abstract
A new grouting model test device has been developed to model the fracture grouting process and improve understanding of the crack propagation regularity during grouting. It was concluded that the propagation process of crack is not one-time formed but undergoes the sequential mode of “expansion, stagnation, re-expansion, re-stagnation” after fracture initiation. The smaller the grouting pressure is, the longer the stagnation time is, and the smaller the crack propagation velocity is. The crack width increases rapidly when the crack tip stagnates or the expansion speed is small. Research results can help achieve better grouting aims and realize grouting safety in practice
Experimental and numerical simulation investigation on tubular expansion process
Authors: Li Xiucheng , Ren Shuai , Li Dejun , Wang Jingliang , Li Xiao , Wang Zhixing , Shang Chengjia 
Published: February 2021

Abstract
Solid expansion technology has brought a revolution for oil and gas drilling and production. The performance of the expandable tubular is determined by the strength of material and the dimensional accuracy of the tube. In this study, the expansion pressures of two expandable tubulars at an expansion ratio of 15.0% were measured by full-scale tests. A 3D finite-element-method model was developed using Abaqus to dynamically simulate the expansion process of solid expandable tubulars. The simulated expansion pressures are in good agreement with experimental results, which proves the validity of the model. Based on the FEM model, the relationship between wall thickness uniformity after expansion and the strain hardening exponent of tubular material was investigated. The results show that the expandable tubular with a high strain hardening exponent can obtain more uniform wall thickness after expansion. The FEM model may be applied for design of expansion process and development of expandable tubulars in the future.
Research on Comprehensive Treatment Method of Low-Production and Low-efficiency Well
Authors: An Xu 
Published: February 2021

Abstract
In recent years, low-yield and low-efficiency wells are increasing year by year, which seriously affects the overall development effect of the development zone. On the basis of field investigation, combined with the actual situation, this paper deeply analyzes the causes of low-yield and low-efficiency wells, studies the treatment methods of different types of low-yield and low-efficiency wells, and summarizes the treatment method of “focusing on adjusting water injection wells and using pressure to supplement and plug production wells”. At the same time, combined with a series of supporting measures to tap the potential, the method of tapping the potential is continuously optimized, and the treatment scheme of single well measures is formulated one by one.
Post-Evaluation Feedback Mechanism of Geological Oil Reservoir Engineering
Authors: Fan Hailin 
Published: February 2021

Abstract
Post evaluation of oilfield productivity construction project is a comprehensive work. Reservoir engineering project, as the hardcore of entire post evaluation, is the basis of oil production and surface engineering project post evaluations. The feedback effect of post evaluation on reservoir engineering project has two points: later adjusting on block evaluated and guidance for reservoir engineering project design. It has important significance to oilfield development adjusting that accomplishing feedbacks well of post evaluation work and information.
Application of Fine Management in Polymer Injection Quality in Oilfield
Authors: Li Hui 
Published: February 2021

Abstract
The implementation of polymer injection in oilfield has a very important impact on oilfield exploitation, which is related to oilfield exploitation efficiency and oil quality to a certain extent. In this paper, the refined management method in oilfield polymer injection work is analyzed and studied, and the important role of refined management concept and its application in oilfield polymer injection process is briefly expounded. Taking SL oilfield as an example, the specific application of refined management concept in oilfield polymer injection work is expounded.
Discussion on Reasonable Well Spacing of Polymer Flooding in the Second Class Reservoir of Lamadian Oilfield
Authors: Dai Xin 
Published: February 2021

Abstract
Lamadian Oilfield entered the development stage of polymer flooding in the second-class reservoir in 2006. At present, 8 blocks of well distribution schemes have been compiled and 6 blocks have been put into production by perforation. From the well spacing adopted in the polymer flooding development block of Class II reservoir and the polymer flooding test area of Sa iii 4-10 reservoir in La’nan Area 1, the injection-production well spacing is mainly 106 m ~ 212 m. According to the current development effect of each block, the well spacing of each set has certain inadaptability. Therefore, this paper, on the premise of guiding the preparation of well distribution plan in Area 2 of Middle East Block of La’nan, discusses the reasonable well spacing of polymer flooding in the second class reservoir from the aspects of control degree of polymer flooding, well pattern density, single well controlled reserves and so on. Combined with the actual situation of the implemented polymer flooding block, it is concluded that when the injection-production well spacing is 150m, it has about 80% polymer flooding control degree for the second-class reservoir, which can ensure reasonable well pattern density and single well controlled reserves, and obtain higher recovery ratio and economic benefits.
Research on the Causes and Treatment Measures of the Test Instruments for Water Injection Wells
Authors: Sun Bing 
Published: February 2021

Abstract
Based on the development demand of comprehensive treatment of water injection wells in oil fields, in the process of carrying out maintenance operations, comprehensive analysis is carried out from the angles of water injection well test resistance, tracking description, etc., so as to improve the practical application effect of water injection well test instruments, and play a positive role in improving the treatment effect of water injection well test instruments. Combined with the actual application of water injection well testing instruments, this paper analyzes the reasons for the resistance of water injection well testing instruments, and optimizes the maintenance of water injection well testing instruments and the treatment of pipe corrosion and scaling, so as to improve the treatment effect of water injection well testing instruments.
Experimental Study on Improving Oil Displacement Efficiency by Air Foam Flooding in Tight Oil Layer
Authors: Shang Linlin 
Published: February 2021

Abstract
The tight oil layer is poor in physical property, small pore throat radius, serious heterogeneity of reservoir, low flooding efficiency, poor water flooding efficiency and final recovery is lower than 10%. In order to further improve the oil displacement yield and simulate the conditions of oil layer, we have carried out the experiment of air foam liquid system to flooding oil, and studied the rule of improving the displacement efficiency of air tight foam reservoir. The experimental results show that the density of Gaotaizi water flooding ultimate oil displacement efficiency is 48.95% on average, after water flooding to air - foam flooding alternating final displacement efficiency is high up 79.63%, the oil displacement efficiency can be increased by 26.92%; a short alternately displacement than the big slug is better, the gas-liquid ratio is too high, the breakthrough time of change in short, flooding effect, direct air - foam liquid slug can achieve good flooding effect. That air foam flooding can improve the oil displacement efficiency of dense oil after water flooding by air - foam liquid slug, gas-liquid ratio, cycle injection parameter optimization, to further improve the dense oil displacement effect, the results of air foam flooding field test has the reference and guiding significance for the tight reservoir.
Effect Analysis of Cross-layer Fracturing in Horizontal Wells
Authors: Chen Xiaoyan , Wang Ning , He Lei , Pan Hongbo , Zhao Hui 
Published: February 2021

Abstract
This paper mainly analyzes the fracturing effect of horizontal wells in the development process of horizontal wells in low permeability A reservoir. On the basis of tracer monitoring, microseismic monitoring and production performance data, it is considered that fracturing breakthrough can be basically realized with the current fracturing scale of horizontal wells, but the actual breakthrough effect of communication layer depends on synchronous water injection to maintain formation energy. At the same time, the large-scale fracturing of horizontal wells can form a network fracture body in the formation, which is conducive to the production of oil layers near the well. Based on this conclusion, the next step is to formulate water injection policy for horizontal well development, so as to provide basis for future development research and water injection adjustment of horizontal wells in the same type of oilfield.
Study on potential and distribution of remaining oil after polymer flooding in XX Oilfield
Authors: Chen Zhao 
Published: February 2021

Abstract
XX oilfield has been put into polymer flooding development for 24 years, with cumulative oil production reaching XX million tons. Since 2005, the first-class reservoirs of early polymer flooding have been transferred to subsequent water flooding. After long-term water flooding, polymer flooding and subsequent water flooding, these reservoirs are in the development stage of “double extra high”, with high reservoir production degree, serious ineffective circulation and highly dispersed remaining oil, which makes it difficult to further tap potential. Therefore, the remaining oil potential and distribution law are studied in the first class oil layer in XX area of oilfield, which provides geological basis for further development and adjustment of EOR.
Study on the standard of well and layer selection for infill wells in L13 well area of medium and low permeability L Oilfield
Authors: Xu Xiaoming , Xu Guoqing , Gong Liwei , Zhang Qiaoming , Hao Ming 
Published: February 2021

Abstract
L oilfield entered the stage of high water cut development, because the high water flooded zone in infill wells was not used in the early stage, the relationship between subsurface injection and production in some horizons was imperfect, and the remaining oil showed a distribution pattern of “overall dispersion and local relative enrichment”, which affected the oilfield development effect. By filling holes in infill wells in time and perfecting the local injection-production relationship, the remaining oil in the imperfect injection-production parts can be effectively used and the oilfield development effect can be improved. In this paper, through the comprehensive analysis of previous hole-patching effects, the original well-selecting and layer-selecting standards are re-evaluated, the hole-patching and layer-selecting standards are further improved, and the oilfield hole-patching potential is implemented, which is of great significance for guiding the oilfield to tap the potential remaining oil.