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Resistivity response of coal under hydraulic fracturing with different injection rates:A laboratory study

International Journal of Mining Science and Technology 2022年第4期32卷 807-819页

作者： Mingyang Song Quangui Li Qianting Hu Yanqing Wu Guanhua Ni Yangcheng Xu Yuebing Zhang Liangping Hu Jialin Shi Jichuan Liu Yize Deng State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China School of Resources and Safety Engineering Chongqing UniversityChongqing 400044China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266510China

Resistivity will have different response characteristics to the hydraulic fracture propagation process. In this work, a resistivity testing system for hydraulic fracturing specimens was established. Resistivity and acoustic emission(AE) information were jointly analysed to determine the dynamic response characteristics of resistivity during hydraulic fracture propagation. The results show that the water and fracture exert a competitive influence on the connection structure of the circuit, and there are two significant peak resistivity points in the curve, presenting a double peak therein. The peak resistivity data of the specimen with a larger fracture area are much different from the initial value. With the increase of the rate of injection, the range of variation of the highest value that can be reached with the specimen resistivity decreases. High resistivity rates or high resistivity fluctuations exhibit rapid a release of fracture energy. The fracture failure mode dominated by shear fractures makes the formation produce a “series+parallel” electrical connection structure;a calculation model of formation resistivity based on shear and tensile failure was proposed to characterize the proportion of different types of hydraulic fractures and elucidate the control effect of matrix resistivity on the electrical performance of the overall circuit structure.

关键词： Resistivity Hydraulic fracturing injection rate Fracture extension Acoustic emission

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喷油规律曲线对OPOC柴油机的性能影响分析

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建模与仿真 2024年第1期13卷 33-41页

作者：张鑫楠天津市特种设备监督检验技术研究院，天津

针对OPOC柴油机与传统柴油机结构、喷油方式的差异，研究分析了四种不同的喷油规律曲线对OPOC柴油机性能的影响情况，寻找燃烧、油耗和排放最优时的喷油规律。在AVL-FIRE中建立了燃烧室的动网格模型，模拟得到了四种喷油规律曲线下的发... 详细信息

针对OPOC柴油机与传统柴油机结构、喷油方式的差异，研究分析了四种不同的喷油规律曲线对OPOC柴油机性能的影响情况，寻找燃烧、油耗和排放最优时的喷油规律。在AVL-FIRE中建立了燃烧室的动网格模型，模拟得到了四种喷油规律曲线下的发动机性能曲线。结果表明：三角形曲线的爆发压力峰值最大，升压最快；矩形曲线的初期混合迅速，预混燃烧放热量大；梯形曲线的后期混合最优，扩散燃烧阶段放热量大。

关键词：喷油规律 OPOC柴油机燃烧排放 injection rate OPOC Diesel Engine Combustion Emission

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Optimization of injection Parameters for Profile Control and Flooding in an Oilfield during High Water Cut Period

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Journal of Geoscience and Environment Protection 2023年第11期11卷 73-81页

作者： Meinan Wang Hui Cai Xiaoqi Chen Junting Zhang Yue Xie Bohai Oilfield Research Institute of CNOOC Ltd. Tianjin Branch Tianjin China

In order to improve the effect of water control and oil stabilization during high water cut period, a mathematical model of five point method well group was established with the high water cut well group of an Oilfield as the target area, the variation law of water cut and recovery factor of different injection parameters was analyzed, and the optimization research of injection parameters of polymer enhanced foam flooding was carried out. The results show that the higher the injection rate, the lower the water content curve, and the higher the oil recovery rate. As the foam defoamed when encountering oil, when the injection time was earlier than 80% of water cut, the later the injection time was, the better the oil displacement effect would be. When the injection time was later than 80% of water cut, the later the injection time was, the worse the oil displacement effect would be. The larger the injection volume, the lower the water content curve and the higher the recovery rate. After the injection volume exceeded 0.2 PV, the amplitude of changes in water content and recovery rate slowed down. The optimal injection parameters of profile control agent for high water content well group in Oilfield A were: injection rate of 15 m3/d, injection timing of 80% water content, and injection volume of 0.2 PV.

关键词： High Water Cut Period Profile Control injection rate injection Timing injection Volume

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Study of the Combustion Process inside an Ethanol-Diesel Dual Direct injection Engine Based on a Non-Uniform injection Approach

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Fluid Dynamics & Materials Processing 2021年第1期17卷 159-170页

作者： Liying Zhou Yu Liang School of Mechanical Engineering Guizhou Institute of TechnologyGuiyang550003China School of Mechanical Engineering Guiyang UniversityGuiyang550005China

The use of ethanol is a promising method to reduce the emissions of diesel *** present study has been based on the installation of a gasoline electronic injection system in a single-cylinder diesel engine to control the amount of ethanol entering the cylinder during the compression(while diesel has been injected into the cylinder by the original pump injection system).The injection time has been controlled by crank angle signal collected by an AVL angle *** the tests ethanol and diesel each accounted for half of the fuel volume,and the total heat energy supply of the fuel was equivalent to that of the diesel under the operating conditions of the original engine.A three-dimensional combustion model of the diesel engine has been implemented by using the CFD software *** have been carried out assuming uniform and non-uniform injections rate for the different holes and the different results have been *** to these results,a non-uniform injection rate can produce early ignition and cause an increase in the maximum in-cylinder pressure and the maximum average incylinder ***,in such conditions NO emissions are larger while soot emission is slightly lower.

关键词： Combustion process dual direct injection diesel ethanol injection rate

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