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Analysis of the Emissions and Performance of a Diesel Engine Using Pumpkin Seed Oil Methyl Ester with Different Injection Pressures
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作者 Surendrababu Kuppusamy Prabhahar Muthuswamy +1 位作者 Muthurajan Kumarasamy Sendilvelan Subramanian 《Fluid Dynamics & Materials Processing》 EI 2023年第4期1003-1014,共12页
Biodiesel fuel is a potential alternative energy source for diesel engines due to its physiochemical characteristics relatively similar to those of traditional diesel fuel.In this study,the performance,emission,and co... Biodiesel fuel is a potential alternative energy source for diesel engines due to its physiochemical characteristics relatively similar to those of traditional diesel fuel.In this study,the performance,emission,and combustion features of a mono cylinder DI diesel engine are assessed using 20%Pumpkin seed methyl ester(PSOME20)and considering varying injection pressures(200,220,240,and 260 bar).The considered Pumpkin seed oil is converted into pumpkin biodiesel by transesterification and then used as fuel.The findings demonstrate that the Brake Thermal Efficiency(BTE)of PSOME20 can be raised by 1.68%,and the carbon monoxide(CO),hydrocarbon(HC),and smoke emanations can be lowered,while oxides of nitrogen(NOx)emissions are increased at an injection pressure(IP)of 240 bar compared to the standard IP of 200 bar.The cylinder pressure and the Heat Release Rate(HRR)become higher at 240 bar,whereas the ignition delay is shortened with respect to PSOME20 at a normal IP of 200 bar. 展开更多
关键词 Pumpkin seed biodiesel PERFORMANCE EMISSION diesel engine injection pressure
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A Spiral History of the Development of Ways to Identify the Correct Position of the Injection Needle in Relation to the Peripheral Nerve: A Brief Historical Essay
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作者 Valery Piacherski Lidziya Muzyka 《Open Journal of Anesthesiology》 2023年第5期95-100,共6页
The first way to identify the needle in relation to the peripheral nerve W. Halsted and R. Hall in 1884 performed the first regional blockade (using direct visualization). However, Vassily von Anrep was a few months e... The first way to identify the needle in relation to the peripheral nerve W. Halsted and R. Hall in 1884 performed the first regional blockade (using direct visualization). However, Vassily von Anrep was a few months earlier described the blockade of the peripheral nerve by anatomical landmarks. In 1912, the blockade of the brachial plexus was first performed using electrical stimulation, but this technique has been widely used only since 1962. The most popular way to identify the needle relative to the nerve at the moment remains US guidance. A promising direction may be optical coherence tomography. But this method is under development. In the last decade, a method for determining the pressure of a local anesthetic has been introduced into practice to determine the position of the needle relative to the nerve. 展开更多
关键词 Regional Anesthesia Electrical Nerve Stimulation Ultrasound Guidance Оptical Coherence Tomography Local Anesthetic Pressure Injection Pressure
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The geomechanics of Shenhua carbon dioxide capture and storage(CCS) demonstration project in Ordos Basin,China 被引量:8
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作者 Xiaochun Li Qi Li +2 位作者 Bing Bai Ning Wei Wei Yuan 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2016年第6期948-966,共19页
Carbon dioxide(CO2) capture and storage(CCS) is considered widely as one of promising options for CO2emissions reduction,especially for those countries with coal-dominant energy mix like China.Injecting and storing a ... Carbon dioxide(CO2) capture and storage(CCS) is considered widely as one of promising options for CO2emissions reduction,especially for those countries with coal-dominant energy mix like China.Injecting and storing a huge volume of CO2in deep formations are likely to cause a series of geomechanical issues,including ground surface uplift,damage of caprock integrity,and fault reactivation.The Shenhua CCS demonstration project in Ordos Basin,China,is the first and the largest full-chain saline aquifer storage project of CO2in Asia.The injection started in 2010 and ended in 2015.during which totally 0.3 million tonnes(Mt) CO2was injected.The project is unique in which CO2was injected into 18 sandstone formations simultaneously and the overlying coal seams will be mined after the injection stopped in 2015.Hence,intense geomechanical studies and monitoring works have been conducted in recent years,including possible damage resulting from the temperature difference between injected CO2and formations,injection induced stress and deformation change,potential failure mode and safety factor,interaction between coal mining and CO2geological storage,determination of injection pressure limit,and surface monitoring by the interferometric synthetic aperture radar(InSAR) technology.In this paper,we first described the background and its geological conditions of the Shenhua CCS demonstration project.Then,we gave an introduction to the coupled thermo-hydro-mechano-chemical(THMC) processes in CO2geological storage,and mapped the key geomechanical issues into the THMC processes accordingly.Next,we proposed a generalized geomechanical research flowchart for CO2geological storage projects.After that,we addressed and discussed some typical geomechanical issues,including design of injection pressure limit.CO2injection induced near-field damage,and interaction between CO2geological storage and coal mining,in the Shenhua CCS demonstration project.Finally,we concluded some insights to this CCS project. 展开更多
关键词 Mechanical stability Carbon dioxide(CO_2) geological storage Injection pressure limit Caprock integrity Coal mining
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Study on Reducing Injection Pressure of Low Permeability Reservoirs Characterized by High Temperature and High Salinity 被引量:4
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作者 Zhao Lin Qin Bing +2 位作者 Wu Xiongjun Wang Zenglin Jiang Jianlin 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2021年第2期44-54,共11页
In view of the problems of high injection pressure and low water injection rate in water injection wells of low permeability reservoirs featuring high temperature and high salinity,two new surfactants were synthesized... In view of the problems of high injection pressure and low water injection rate in water injection wells of low permeability reservoirs featuring high temperature and high salinity,two new surfactants were synthesized,including a quaternary ammonium surfactant and a betaine amphoteric surfactant.The composite surfactant system BYJ-1 was formed by mixing two kinds of surfactants.The minimum interfacial tension between BYJ-1 solution and the crude oil could reach 1.4×10^(-3) mN/m.The temperature resistance was up to 140℃,and the salt resistance could reach up to 120 g/L.For the low permeability core fully saturated with water phase,BYJ-1 could obviously reduce the starting pressure gradient of low permeability core.While for the core with residual oil,BYJ-1 could obviously reduce the injection pressure and improve the oil recovery.Moreover,the field test showed that BYJ-1 could effectively reduce the injection pressure of the water injection well,increase the injection volume,and increase the liquid production and oil production of the corresponding production well. 展开更多
关键词 low permeability reservoir quaternary ammonium salt betaine surfactant interfacial tension reducing injection pressure enhancing oil recovery
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Simulating hydraulic fracturing processes in laboratory-scale geological media using three-dimensional TOUGH-RBSN 被引量:2
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作者 Daisuke Asahina Pengzhi Pan +2 位作者 Kimikazu Tsusaka Mikio Takeda John E.Bolander 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2018年第6期1102-1111,共10页
In this context, recent developments in the coupled three-dimensional(3 D) hydro-mechanical(HM)simulation tool TOUGH-RBSN are presented. This tool is used to model hydraulic fracture in geological media, as observed i... In this context, recent developments in the coupled three-dimensional(3 D) hydro-mechanical(HM)simulation tool TOUGH-RBSN are presented. This tool is used to model hydraulic fracture in geological media, as observed in laboratory-scale tests. The TOUGH-RBSN simulator is based on the effective linking of two numerical methods: TOUGH2, a finite volume method for simulating mass transport within a permeable medium; and a lattice model based on the rigid-body-spring network(RBSN) concept. The method relies on a Voronoi-based discretization technique that can represent fracture development within a permeable rock matrix. The simulator provides two-way coupling of HM processes, including fluid pressure-induced fracture and fracture-assisted flow. We first present the basic capabilities of the modeling approach using two example applications, i.e. permeability evolution under compression deformation, and analyses of a static fracturing simulation. Thereafter, the model is used to simulate laboratory tests of hydraulic fracturing in granite. In most respects, the simulation results meet expectations with respect to permeability evolution and fracturing patterns. It can be seen that the evolution of injection pressure associated with the simulated fracture developments is strongly affected by fluid viscosity. 展开更多
关键词 Hydraulic fracture Crack opening TOUGH Rigid-body-spring network(RBSN) Permeability Injection pressure Fluid viscosity Hydro-mechanical(HM) processes
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A fast explicit finite difference method for determination of wellhead injection pressure 被引量:2
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作者 白冰 李小春 +2 位作者 刘明泽 石露 李琦 《Journal of Central South University》 SCIE EI CAS 2012年第11期3266-3272,共7页
A fast explicit finite difference method (FEFDM),derived from the differential equations of one-dimensional steady pipe flow,was presented for calculation of wellhead injection pressure.Recalculation with a traditiona... A fast explicit finite difference method (FEFDM),derived from the differential equations of one-dimensional steady pipe flow,was presented for calculation of wellhead injection pressure.Recalculation with a traditional numerical method of the same equations corroborates well the reliability and rate of FEFDM.Moreover,a flow rate estimate method was developed for the project whose injection rate has not been clearly determined.A wellhead pressure regime determined by this method was successfully applied to the trial injection operations in Shihezi formation of Shenhua CCS Project,which is a good practice verification of FEFDM.At last,this method was used to evaluate the effect of friction and acceleration terms on the flow equation on the wellhead pressure.The result shows that for deep wellbore,the friction term can be omitted when flow rate is low and in a wide range of velocity the acceleration term can always be deleted.It is also shown that with flow rate increasing,the friction term can no longer be neglected. 展开更多
关键词 wellhead pressure injection pressure bottom-hole pressure fast explicit finite difference method
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STRUCTURE PARAMETERS DESIGN AND PERFORMANCE TEST OF FUEL INJECTION SYSTEM 被引量:4
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作者 WU Changshui YU Jinxia YANG Lin ZHUO Bin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第3期407-411,共5页
Based on the numerical simulation analysis, structure parameters of the high pressure fuel pump and common rail as well as flow limiter are designed and the GD-1 high pressure common rail fuel injection system is self... Based on the numerical simulation analysis, structure parameters of the high pressure fuel pump and common rail as well as flow limiter are designed and the GD-1 high pressure common rail fuel injection system is self-developed. Fuel injection characteristics experiment is performed on the GD-1 system. And double-factor variance analysis is applied to investigate the influence of the rail pressure and injection pulse width on the consistency of fuel injection quantity, thus to test whether the design of structure parameters is sound accordingly. The results of experiment and test show that rail pressure and injection pulse width as well as their mutual-effect have no influence on the injection quantity consistency, which proves that the structure parameters design is successful and performance of GD-1 system is sound. 展开更多
关键词 High pressure common rail fuel injection system Structure parameters design Variance analysis
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Microscopic pore characteristics of andesite and implication from mineral content:A case study in Huoshiling Formation of Changling fault depression,Songliao Basin 被引量:1
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作者 NIU Penghui SHAN Xuanlong +3 位作者 REN Xianjun YI Jian LIU Chaoyang XING Jian 《Global Geology》 2022年第2期84-96,共13页
In order to study the microscopic pore characteristics of andesite reservoir and the effect of mineral content on the andesite pore,this study takes the andesite of the Huoshiling Formation in Longfengshan of Changlin... In order to study the microscopic pore characteristics of andesite reservoir and the effect of mineral content on the andesite pore,this study takes the andesite of the Huoshiling Formation in Longfengshan of Changling fault depression,Songliao Basin as a subject.The andesite reservoir space was discerned through the observation of cores and casting thin sections.Besides,the pore size distribution of andesites and their mineral contents were quantitatively characterized by high-pressure mercury injection,nitrogen adsorption and XRD,respectively.The results show that:(1)There are various types of reservoir space in andesites,including vesicles,amygdule,intergranular pores,matrix dissolution pores and dissolution pores of amygdala,and three types of fractures including dissolution,structural and explosion fractures.(2)The pore size distribution of andesite is complex.The main pore size of andesite is mid-pore(10-20 nm)with some large-pores(>50 nm).Mid-pore and large-pore provide the main specific surface area,which are the main space for gas storage.(3)The andesite reservoir space in the study area is mainly controlled by dissolution,as supported by the relationship between the change of mineral content and porosity evolution.The porosity of andesites decreases with the increase of quartz and chlorite content,but increases with the increase of soluble mineral,e.g.,feldspar content. 展开更多
关键词 ANDESITE microscopic pore high pressure mercury injection nitrogen adsorption XRD
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Application of contrast agent injection device in real-time threedimensional hysterosalpingo-contrast sonography 被引量:1
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作者 Rui Wang Jin-Ping Wang +1 位作者 Yan Li Xiao-Yi Chen 《Journal of Hainan Medical University》 2021年第1期26-30,共5页
Objective:To investigate the correlation between the peak pressure of contrast agent injection and tubal patency during real-time three-dimensional hysterosalpingo-contrast sonography.Methods:Seventy female patients w... Objective:To investigate the correlation between the peak pressure of contrast agent injection and tubal patency during real-time three-dimensional hysterosalpingo-contrast sonography.Methods:Seventy female patients who underwent real-time three-dimensional hysterosalpingo-contrast sonography of uterine and oviduct in the department of ultrasound medicine in our hospital were selected to measure the peak pressure in the examination process through the pressure injection device of contrast agent,to compare the pressure differences of different obturability patency degree of oviduct,and to draw a ROC curve to determine the optimal cut-off value of the peak pressure.Results:According to the different patency degree of fallopian tubes,the contrast results were divided into three groups:bilateral tubes unobstructed group,unilateral tube lesioned group and bilateral tubes lesioned group.The peak pressures of the three groups were(34.69±9.30)KPa,(52.71±18.55)KPa and(73.88±11.01)KPa,respectively.The area under the peak pressure ROC curve(AUC)of the"unilateral tube lesioned group"and"bilateral tubes lesioned group"was 0.785,the optimal cut-off value of the peak pressure was 51.90KPa,the area under the peak pressure ROC curve(AUC)of the"unilateral tube lesioned group"and"bilateral tubes lesioned group"was 0.851,and the optimal cut-off value of the peak pressure was 73.50KPa.Conclusion:The peak pressure of contrast agent injection in RT-3D-HyCoSy can be used as a quantitative index to deduce the patency degree of oviduct.There is a correlation between the peak pressure and the tubal patency. 展开更多
关键词 Injection pressure Tubal patency Quantitative indicators
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Study of the expansion characteristics of a pulsed plasma jet in air
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作者 赵雪维 余永刚 +1 位作者 莽珊珊 薛晓春 《Plasma Science and Technology》 SCIE EI CAS CSCD 2017年第4期48-61,共14页
In the background of electrothermal-chemical (ETC) emission,an investigation has been conducted on the characteristics of a freely expanding pulsed plasma jet in air.The evolutionary process of the plasma jet is exp... In the background of electrothermal-chemical (ETC) emission,an investigation has been conducted on the characteristics of a freely expanding pulsed plasma jet in air.The evolutionary process of the plasma jet is experimentally investigated using a piezoelectric pressure sensor and a digital high-speed video system.The variation relation in the extended volume,axial displacement and radial displacement of the pulsed plasma jet in atmosphere with time under different discharge voltages and jet breaking pressures is obtained.Based on experiments,a two-dimensional axisymmetric unsteady model is established to analyze the characteristics of the two-phase interface and the variation of flow-field parameters resulting from a pulsed plasma jet into air at a pressure of 1.5-3.5 MPa under three nozzle diameters (3 mm,4 mm and 5 ram,respectively).The images of the plasma jet reveal a changing shape process,from a quasiellipsoid to a conical head and an elongated cylindrical tail.The axial displacement of the jet is always larger than that along the radial direction.The extended volume reveals a single peak distribution with time.Compared to the experiment,the numerical simulation agrees well with the experimental data.The parameters of the jet field mutate at the nozzle exit with a decrease in the parameter pulse near the nozzle,and become more and more gradual and close to environmental parameters.Increasing the injection pressure and nozzle diameter can increase the parameters of the flow field such as the expansion volume of the pulsed plasma jet,the size of the Mach disk and the pressure.In addition,the turbulent mixing in the expansion process is also enhanced. 展开更多
关键词 electrothermal-chemical propulsion pulsed plasma jet injection pressure nozzlediameter EXPERIMENT numerical simulation
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Experimental study of water effects on gas desorption during highpressure water injection
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作者 ZHANG Guo-hua LIU Xian-xin BI Ye-wu PU Wen-long 《Journal of Coal Science & Engineering(China)》 2011年第4期408-413,共6页
For the question of applying high-pressure water injection to increase gas extraction efficiency by increasing the permeability of water to drive gas action, an independently designed gas desorption experimental measu... For the question of applying high-pressure water injection to increase gas extraction efficiency by increasing the permeability of water to drive gas action, an independently designed gas desorption experimental measuring device was used under the condition of external solution invasion. The law of water effect on gas desorption was obtained after water invasion through experiment for the first time. The results show that water's later invasion not only can make the quantity of gas dcsorp- tion greatly reduced, but also can make gas desorption end early. Therefore, when evaluating the applications of high-pressure water injection to increase gas extraction efficiency, we should take water damaging effects on gas desorption into account. 展开更多
关键词 gas desorption gas extraction high pressure water injection later invasion
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Mixture Preparation and Combustion of CNG Low-Pressure Compound Direct Injection Spark-Ignited Engines
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作者 胡春明 侯圣智 +4 位作者 詹樟松 刘斌 刘娜 于勇 宋玺娟 《Transactions of Tianjin University》 EI CAS 2011年第6期411-417,共7页
A set of compressed natural gas (CNG) multi-point direct injection system of spark-ignited engines and the corresponding measurement and data acquisition systems were developed in this paper. Based on different inject... A set of compressed natural gas (CNG) multi-point direct injection system of spark-ignited engines and the corresponding measurement and data acquisition systems were developed in this paper. Based on different injection modes, the mixture formation and combustion of CNG low-pressure direct injection (LPDI) engines were studied under varying factors such as air/ fuel ratio, injection timing. Meanwhile, three-dimensional simulations were adopted to explain the mixture formation mechanisms of CNG low-pressure compound direct injection (LPCDI) mode. On the basis of test results and simulation of the mixture homogeneous degree, the conception of injection window was proposed, and the LPCDI mode was proved to be more beneficial to the mixture concentration stratification formation in cylinder under lean-burning conditions, which resulted in effective combustion and stability. 展开更多
关键词 compressed natural gas (CNG) engine mixture homogeneous degree injection timing low pressure compound direct injection (LPCDI)
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Experimental Study and 3D CFD Analysis on the Optimization of Throttle Angle for a Convergent Vortex Tube
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作者 Seyed Ehsan Rafiee M.M.Sadeghiazad 《Journal of Marine Science and Application》 CSCD 2016年第4期388-404,共17页
Seven adjustments of convergent-type Vortex Tube (VT) with different throttle angles were applied. The adjustments were made to analyze the influences of such angles on cold and hot temperature drops as well as flow... Seven adjustments of convergent-type Vortex Tube (VT) with different throttle angles were applied. The adjustments were made to analyze the influences of such angles on cold and hot temperature drops as well as flow structures inside the VTs. An experimental setup was designed, and tests were performed on different convergent VT configurations at injection pressures ranging from 0.45 to 0.65 MPa. The angles of the throttle valve were arranged between 30° to 90°, and the numbers of injection nozzles ranged between 2 and 6. Laboratory results indicated that the maximum hot and cold temperature drops ranged from 23.24 to 35 K and from 22.87 to 32.88 K, respectively, at four injection nozzles. Results also showed that temperature drop is a function of hot throttle valve angle with the maximum hot and cold temperature drops depending on the angle applied. We used graphs to demonstrate the changes in the cold and hot temperature drops with respect to hot throttle angle values. These values were interpreted and evaluated to determine the optimum angle, which was 60°. The CFD outputs agreed very well with the laboratory results. The proposed CFD results can help future researchers gain good insights into the complicated separation process taking place inside the VTs. 展开更多
关键词 convergent vortex tube throttle valve CFD conical valve angle injection pressure slots number OPTIMIZATION
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The effect of silica nanoparticle aggregates on wax dissolution in diesel oil
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作者 Sun Renyuan Wang Lei +2 位作者 Sun Chao Lin Lei Jiang Hanqiao 《Petroleum Science》 SCIE CAS CSCD 2011年第2期207-210,共4页
In recent years, silica nanoparticle aggregates (SNPAs) have been used to decrease the injection pressure of wells in low permeability reservoirs achieving good results. In order to study the mechanisms for reductio... In recent years, silica nanoparticle aggregates (SNPAs) have been used to decrease the injection pressure of wells in low permeability reservoirs achieving good results. In order to study the mechanisms for reduction in the injection pressure of low permeability wells by the SNPA-diesel oil system injection, the microstructure of SNPAs was observed with a transmission electron microscope (TEM). The particle size distribution of SNPAs was also measured by the laser scattering method. The viscosities of diesel oil and SNPA-diesel oil system were measured with a capillary viscometer. The effect of SNPAs on the solubility of wax in the diesel oil was experimentally studied. The influencing factors, including temperature and SNPA concentration in diesel oil, on wax solubility were analyzed. A pore-throat film displacement model (PTFDM) was built for mechanism explanation. The microstructure and size distribution analyses show that the SNPAs are in the nanometer size range. The viscosity of the SNPA-diesel oil system is lower than that of the diesel oil. The solubility of wax in the diesel oil increases greatly due to SNPA addition, the solubility ratio reaches 7.5. The solubility of wax in diesel oil increases with increases in the concentration of SNPAs in the diesel oil and with the temperature. It is proved that the addition of SNPAs to diesel oil helps remove the wax deposited near the wellbore. This maybe one of the main mechanisms for injection pressure decreases in low permeability reservoirs. 展开更多
关键词 Silica nanoparticle aggregates solubility of wax low permeability reservoir pore-throatfilm displacement model injection pressure
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Modeling, analysis, and screening of cyclic pressure pulsing with nitrogen in hydraulically fractured wells
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作者 Emre Artun Ali Aghazadeh Khoei Kutay Kose 《Petroleum Science》 SCIE CAS CSCD 2016年第3期532-549,共18页
Cyclic pressure pulsing with nitrogen is studied for hydraulically fractured wells in depleted reservoirs.A compositional simulation model is constructed to represent the hydraulic fractures through local-grid refinem... Cyclic pressure pulsing with nitrogen is studied for hydraulically fractured wells in depleted reservoirs.A compositional simulation model is constructed to represent the hydraulic fractures through local-grid refinement.The process is analyzed from both operational and reservoir/hydraulic-fracture perspectives.Key sensitivity parameters for the operational component are chosen as the injection rate,lengths of injection and soaking periods and the economic rate limit to shut-in the well.For the reservoir/hydraulic fracturing components,reservoir permeability,hydraulic fracture permeability,effective thickness and half-length are used.These parameters are varied at five levels.A full-factorial experimental design is utilized to run 1250 cases.The study shows that within the ranges studied,the gas-injection process is applied successfully for a 20-year project period with net present values based on the incremental recoveries greater than zero.It is observed that the cycle rate limit,injection and soaking periods must be optimized to maximize the efficiency.The simulation results are used to develop a neural network based proxy model that can be used as a screening tool for the process.The proxy model is validated with blind-cases with a correlation coefficient of 0.96. 展开更多
关键词 Cyclic pressure pulsing Nitrogen injection Hydraulically-fractured wells Experimental design Artificial neural networks
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A new method for evaluating the injection effect of chemical flooding
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作者 Jian Hou Yan-Hui Zhang +2 位作者 Nu Lu Chuan-Jin Yao Guang-Lun Lei 《Petroleum Science》 SCIE CAS CSCD 2016年第3期496-506,共11页
Hall plot analysis,as a widespread injection evaluation method,however,often fails to achieve the desired result because of the inconspicuous change of the curve shape.Based on the cumulative injection volume,injectio... Hall plot analysis,as a widespread injection evaluation method,however,often fails to achieve the desired result because of the inconspicuous change of the curve shape.Based on the cumulative injection volume,injection rate,and the injection pressure,this paper establishes a new method using the ratio of the pressure to the injection rate(RPI) and the rate of change of the RPI to evaluate the injection efficiency of chemical flooding.The relationship between the RPI and the apparent resistance factor(apparent residual resistance factor) is obtained,similarly to the relationship between the rate of change of the RPI and the resistance factor.In order to estimate a thief zone in a reservoir,the influence of chemical crossflow on the rate of change of the RPI is analyzed.The new method has been applied successfully in the western part of the Gudong 7th reservoir.Compared with the Hall plot analysis,it is more accurate in real-time injection data interpretation and crossflow estimation.Specially,the rate of change of the RPI could be particularly suitably applied for new wells or converted wells lacking early water flooding history. 展开更多
关键词 Ratio of the pressure to the injection rate Rate of change of the RPI Injection efficiency Chemical crossflow
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"One-for-several" rotor VVVF Technique apply to water injection station
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作者 Yanrong CHANG Shouhu WANG Ruxian HE 《International Journal of Technology Management》 2013年第3期38-41,共4页
In the process of oilfield water injection volume of injection allocation often appear with the pump displacement situation does not match, the widespread adoption of stator frequency technology allows the pump displa... In the process of oilfield water injection volume of injection allocation often appear with the pump displacement situation does not match, the widespread adoption of stator frequency technology allows the pump displacement and volume of injection allocation phase matching. But the technology in pump class load application speed range is limited, there is still a reflux valve control blind area," turn off undead" problem. " One-for-several" rotor frequency Technique in water injection station application, solved the control blind area problem, the full realization of the variable frequency close return voltage injection, at the same time, the successful implementation of the slip power efficient feedback. Stable water injection pressure of the system, and the electric energy is saved, satisfy the oilfield high efficiency, fine water needs, has a high application value. 展开更多
关键词 "One-for-several" rotor frequency Variable frequency speed regulation Stable pressure water injection Energy saving
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Effects of multiple intravitreal anti-VEGF injections on retinal nerve fiber layer and intraocular pressure: a comparative clinical study
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作者 Franck Amouyal Danièle Denis Frédéric Matonti 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2014年第4期740-740,共1页
Dear Sir,Ifound the article by Sobac1etal[1]very interesting.The authors concluded that repeated intravitreal injection(IVI)of ranibizumab or bevacizumab didn’t seem have adverse effects on retinal nerve fiber layer(... Dear Sir,Ifound the article by Sobac1etal[1]very interesting.The authors concluded that repeated intravitreal injection(IVI)of ranibizumab or bevacizumab didn’t seem have adverse effects on retinal nerve fiber layer(RNFL)thickness in wet age-related macular degeneration(AMD)patients. 展开更多
关键词 RNFL Effects of multiple intravitreal anti-VEGF injections on retinal nerve fiber layer and intraocular pressure a comparative clinical study
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Performance,combustion,and emission characteristics of on a diesel engine fuelled with hydrogen compressed natural gas and Kusum seed biodiesel 被引量:2
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作者 Krishna Bharathi Parimi Bhatti Sukhvinder Kaur +1 位作者 Sathya Vara Prasad Lankapalli Jaikumar Sagari 《Waste Disposal and Sustainable Energy》 EI CSCD 2023年第2期151-163,共13页
Renewable fuels have many advantages over fossil fuels because they are biodegradable and sustainable,and help mitigate social and environmental problems.The objective of the present study is to evaluate the performan... Renewable fuels have many advantages over fossil fuels because they are biodegradable and sustainable,and help mitigate social and environmental problems.The objective of the present study is to evaluate the performance,combustion,and emission characteristics of a compression–ignition engine using hydrogen compressed natural gas(HCNG)-enriched Kusum seed biodiesel blend(KSOBD20).The flow rate of HCNG was set at 5 L/min,10 L/min,and 15 L/min,and the injection pressure was varied in the range of 180 bar to 240 bar.Brake thermal efficiency(BTE)and brake-specific fuel consumption(BSFC)were improved when HCNG was added to the KSOBD20.Combustion characteristics,namely,cylinder pressure(CP)and net heat release rate(NHRR),were also improved.Emissions of carbon monoxide(CO),hydrocarbons(HC),and smoke were also reduced,with the exception of nitrogen oxides(NO_(x)).The higher injection pressure(240 bar)had a positive effect on the operating characteristics.At an injection pressure of 240 bar,for KSOB20+15 L/min HCNG,the highest BTE and the lowest BSFC were found to be 32.09%and 0.227 kg/kWh,respectively.Also,the CP and NHRR were 69.34 bar and 66.04 J/°.CO,HC,and smoke levels were finally reduced to 0.013%,47×10^(-6)and 9%,respectively,with NO_(x)levels at 1623×10^(-6).For optimum results in terms of engine characteristics,the fuel combination KSOBD20+15 L/min HCNG at FIP 240 bar is recommended. 展开更多
关键词 BIODIESEL Compressed natural gas Injection pressure EMISSION Cylinder pressure Brake thermal efficiency
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In-situ synthesis of high thermal stability and salt resistance carbon dots for injection pressure reduction and enhanced oil recovery 被引量:2
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作者 Yining Wu Lisha Tang +4 位作者 Dayu Liu Demin Kong Liu Kai Mengjiao Cao Qingshan Zhao 《Nano Research》 SCIE EI CSCD 2023年第10期12058-12065,共8页
Carbon dots(CDs)show great potential as a new type of oil-displacing agent for unconventional oil and gas development.However,the instability and easy aggregation epitomize the challenges that accompany the applicatio... Carbon dots(CDs)show great potential as a new type of oil-displacing agent for unconventional oil and gas development.However,the instability and easy aggregation epitomize the challenges that accompany the application of CDs in high temperature and high salinity(HT/HS)reservoirs.In this research,novel benzene sulfonate-modified carbon dots(BS-CDs)with remarkable thermal stability and salt resistance were fabricated through an in-situ electrochemical exfoliation method.Molecular simulation verifies that the introduction of benzene sulfonate groups substantially strengthens the electrostatic repulsion between BS-CDs,leading to outstanding dispersibility and stability even at a temperature of 100℃ and salinity of 14×10^(4) mg/L.Core flooding tests show that 0.05 wt.%BS-CDs nanofluid can significantly reduce the water injection pressure by 50.00%and enhanced oil recovery(EOR)to 68.39%under HT/HS conditions.According to the atomic force microscopy(AFM)scanning results,the adhesion force between the core(after BS-CDs treatment)and oil decreased by 11.94 times,indicating that the hydrophilicity of the core surface was increased.In addition,the distribution of the adhesion force curve is more concentrated,which means that the micro-scale wettability of the core changes from oil-wet to more homogeneous water-wet.This study provides a feasible way for the development and application of good thermal stability and salt resistance CDs in unconventional reservoir development. 展开更多
关键词 carbon dots in-situ modification thermal stability and salt resistance injection pressure reduction enhanced oil recovery
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