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Exploring in-situ combustion effects on reservoir properties of heavy oil carbonate reservoir

Petroleum Science 2024年第5期21卷 3363-3378页

作者： Aliya Mukhametdinova Tagir Karamov Strahinja Markovic Andrey Morkovkin aleksander burukhin Evgeny Popov Zi-Qi Sun Ren-Bao Zhao Alexey Cheremisin Skolkovo Institute of Science and Technology(Skoltech) Sikorskogo 11Moscow121205Russia State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China

Laboratory modeling of in-situ combustion is crucial for understanding the potential success of field trials in thermal enhanced oil recovery(EOR) and is a vital precursor to scaling the technology for field applications. The high combustion temperatures, reaching up to 480℃, induce significant petrophysical alterations of the rock, an often overlooked aspect in thermal EOR projects. Quantifying these changes is essential for potentially repurposing thermally treated, depleted reservoirs for CO_(2) *** this study, we depart from conventional combustion experiments that use crushed core, opting instead to analyze the thermal effects on reservoir properties of carbonate rocks using consolidated samples. This technique maintains the intrinsic porosity and permeability, revealing combustion's impact on porosity and mineralogical alterations, with a comparative analysis of these properties pre-and post-combustion. We characterize porosity and pore geometry evolution using low-field nuclear magnetic resonance, X-ray micro-computed tomography, and low-temperature nitrogen adsorption. Mineral composition of the rock and grain-pore scale alterations are analyzed by scanning electron microscopy and X-ray *** analysis shows a significant increase in carbonate rocks' porosity, pore size and mineral alterations, and a transition from mixed-wet to a strongly water-wet state. Total porosity of rock samples increased in average for 15%-20%, and formation of new pores is registered at the scale of 1-30 μm ***-temperature exposure results in the calcite and dolomite decomposition, calcite dissolution and formation of new minerals—anhydrite and fluorite. Increased microporosity and the shift to strongly water-wet rock state improve the prospects for capillary and residual CO_(2) trapping with greater ***, these findings highlight the importance of laboratory in-situ combustion modeling on consolidated rock over tests that use crushed core, an

关键词： In-situ combustion Thermal EOR Carbonates Porosity and pore size MicroCT NMR SEM CO_(2)storage

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Frequency drift rate of solar decameter"drift pair"bursts

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Research in Astronomy and Astrophysics 2017年第9期17卷 101-110页

作者： aleksander Stanislavsky aleksander Konovalenko Yaroslav Volvach Institute of Radio Astronomy Kharkiv 61002Ukraine V.N.Karazin Kharkiv National University Kharkiv 61002Ukraine

This paper deals with the detailed analysis of frequency drift rates of solar ＂drift pair＂（DP） bursts observed from 2015 July 10 to 12 during a type III burst storm. The observations were conducted by the UTR-2 radio telescope at 9-33 MHz with high frequency and time resolution. DPs were recorded drifting from higher to lower frequencies （forward DPs） as well as from lower to higher ones （reverse DPs）. Patterns on their dynamic spectrum had various inclines and occupied different bandwidths. The frequency drift rate versus frequency dependence of these bursts has been studied. The fitting model to describe the peak evolution of these bursts in the frequency-time plane is presented. The relationship between DPs and type III solar bursts is discussed.

关键词： Sun: corona -- Sun radio radiation -- methods observational -- techniques spectroscopic

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Some Results Connected with the Class Number Problem in Real Quadratic Fields

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Acta Mathematica Sinica,English Series 2005年第5期21卷 1107-1112页

作者： aleksander GRYTCZUK Jaroslaw GRYTCZUK Faculty of Mathematics.Computer Science and Econometrics University of Zielona Gora.65 516 Zielona Gora.Poland Institute

We investigate arithmetic properties of certain subsets of square-free positive integers and obtain in this way some results concerning the class number h（d） of the real quadratic field Q（√d）. In particular, we give a new proof of the result of Hasse, asserting that in this case h（d） = 1 is possible only if d is of the form p, 2q or qr. where p.q. r are primes and q≡r≡3（mod 4）.

关键词： The class number Real quadratic field

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Numerical modelling of the hybrid rocket engine performance

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Propulsion and Power Research 2021年第1期10卷 15-22页

作者： Marian Gieras aleksander Gorgeri a Institute of Heat Engineering Warsaw University of TechnologyWarsaw00-665Poland Łukasiewicz Research Network e Institute of Aviation Warsaw02-256Poland

The purpose of this paper is to present method of the numerical modeling of the hybrid rocket engine's work as a tool for designing engines of this *** model is intended as an accurate and simple to use development tool for use in preliminary design stages of hybrid rocket engines,improving the effectiveness and quality of this *** assumptions underlying the use of a model are presented,together with an analysis of past work in this *** of an extensive experimental campaign are presented and compared with the results of numerical modelling in order to calibrate the proposed model and evaluate its ***eter variation and optimization were conducted,proving functionality of the ***sented numerical calculations show that the adopted approach to reduce the analysis time and complexity was *** method of numerical calculation of hybrid engine working parameters combines aspects of accuracy and simplicity at the early design stage to avoid timeconsuming and costly changes in subsequent detailed stages of design.

关键词： Hybrid rocket engine Combustion Multi-phase flow Regression Specific impulse

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Sperm chromatin structure assay （SCSA）： a tool in diagnosis and treatment of infertility

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Asian Journal of Andrology 2011年第1期13卷 69-75页

作者： Mona Bungum Leif Bungum aleksander Giwercman Reproductive Medicine Centre （RMC） Skane University Hospital SE - 205 02 Maimo Sweden

Diagnosis of male infertility has mainly been based on the World Health Organization （WHO） manual-based semen parameter＇s concentration, motility and morphology. It has, however, become apparent that none of these parameters are reliable markers for evaluation of the fertility potential of a couple. A search for better markers has led to an increased focus on sperm chromatin integrity testing in fertility work-up and assisted reproductive techniques. During the last couple of decades, numerous sperm DNA integrity tests have been developed. These are claimed to be characterized by a lower intraindividual variation, less intralaboratory and interlaboratory variation and thus less subjective than the conventional sperm analysis. However, not all the sperm chromatin integrity tests have yet been shown to be of clinical value. So far, the test that has been found to have the most stable clinical threshold values in relation to fertility is the sperm chromatin structure assay （SCSA）, a flow cytometric test that measures the susceptibility of sperm DNA to acid-induced DNA denaturation in situ. Sperm DNA fragmentation as measured by SCSA has shown to be an independent predictor of successful pregnancy in first pregnancy planners as well as in couples undergoing intrauterine insemination, and can be used as a tool in investigation, counseling and treatment of involuntary childlessness. More conflicting data exist regarding the role of sperm DNA fragmentation in relation to fertilization, pre-embryo development and pregnancy outcome in in vitro fertilization and intracytoplasmic sperm injection （ICSI）.

关键词： assisted reproductive techniques infertility sperm chromatin structure assay sperm DNA

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Environmental xenobiotics and male reproductive health

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Asian Journal of Andrology 2014年第1期16卷 3-4页

作者： Jens Peter Bonde aleksander Giwercman Department of Occupational and Environmental Medicine Frederiksberg and Bispebjerg Hospital University of Copenhagen Denmark Reproductive Medicine Centre Skne University Hospital Maim6 Sweden.

Lessons from the occupational arena fdemonstrate the potential of industrial 4chemicals to damage human testicular function. An important but still unresolved question is whether low-level xenobiotic exposure of the general population poses a hazard. In this volume of the Asian Journal of Andrology, this issue is addressed by a series of reviews on xenobiotic exposure profiles, possible biological mechanisms, research methods and knowledge on impact of specific exposures. Interdisciplinary research fields as gene-environment interaction and male-mediated developmental toxicity is also addressed. Papers are cross-linked by answers to questions mutually put forward by the authors.

关键词： xenobiotics chemicals occupational

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Tailoring electrical conductivity of two dimensional nanomaterials using plasma for edge electronics: A mini review

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 427-443页

作者： Aswathy Vasudevan Vasyl Shvalya aleksander Zidansek Uros Cvelbar Jozef Stefan Institute 1000 LjubljanaSlovenia Jozef Stefan International Postgraduate School 1000 LjubljanaSlovenia Faculty of Natural Sciences and Mathematics University of Maribor2000 MariborSlovenia

Since graphene has been discovered, twodimensional nanomaterials have attracted attention due to their promising tunable electronic properties. The possibility of tailoring electrical conductivity at the atomic level allows creating new prospective 2D structures for energy harvesting and sensing-related applications. In this respect, one of the most successful way to manipulate the physical properties of the aforementioned materials is related to the surface modification techniques employing plasma. Moreover, plasma-gaseous chemical treatment can provide a controlled change in the bandgap, increase sensitivity and significantly improve the structural stability of material to the environment as well. This review deals with recent advances in the modification of 2D carbon nanostructures for novel ‘edge’ electronics using plasma technology and processes.

关键词： graphene edge electronics 2D nanomaterials plasma electrical conductivity

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Fatal meningococcal meningitis in a 2-year-old child:A case report

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World Journal of Clinical Cases 2019年第5期7卷 636-641页

作者： aleksander Mularski Czesław Żaba Department of Legal and Forensic Medicine Poznan University of Medical Sciences Institute of Forensic Research

BACKGROUND In fatal cases of meningococcal septicemia, bacteriological diagnosis may not be straightforward due to postmortem replication and relocation of endogenic microflora. In medicolegal practice, aside from routine autopsy and histopathology, also other diagnostic methods, such as microbiological tests,immunohistochemistry and polymerase chain reaction(PCR), are used to examine body fluids and *** SUMMARY We present the case of sudden death in a 2-year-old child. The patient died approximately 30 min after hospital admission before any routine diagnostic procedures were undertaken. Presence of whole-body rash and fulminant course of the disease raised suspicion of meningococcal septicemia. An autopsy was performed seven days after death when the body showed the signs of late postmortem decomposition. No etiological factor of septicemia could be identified based on macro-and microscopic findings. However, PCR demonstrated the presence of genetic material of group W Neisseria meningitidis in patient's cerebrospinal fluid and *** Microbiological PCR should be conducted postmortem whenever a specific etiological factor could not be identified with conventional methods.

关键词： Meningococcal infection Molecular microbiology Waterhouse-Friderichsen syndrome Neisseria meningitidis Autopsy Cerebrospinal fluid Case report

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Diffusion Carbide Layers, Formed on the Surface of Steel in the Vacuum Titanizing Process

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材料热处理学报 2004年第05B期25卷 646-648页

作者： KASPRZYCKA Ewa SENATORSKI Jan NAKONIECZNY aleksander BABUL Tomasz Institute of Precision Mechanics Warsaw PolandInstitute of Precision Mechanics Warsaw PolandInstitute of Precision Mechanics Warsaw PolandInstitute of Precision Mechanics Warsaw Poland

Diffusion layers produced on carbon steel surface in vacuum titanizing process were investigated. Studies of layers thickness, their morphology, titanium, carbon and iron concentration depth profiles in the diffusion zone of titanized layers were carried out. The effect of process parameters such as time and temperature on the kinetics of layer growth on steel surface was investigated. Tribocorrosion resistance of titanized layers was determined.

关键词：扩散层热化学处理真空镀钛耐蚀性抗磨损性

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The Influence of Method of Carburizing and Nitrocarburizing on the Microstructure and Properties of Tool Steels.

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材料热处理学报 2004年第5期25卷 386-389页

作者： Tomasz Babul Natalia Kucharieva aleksander Nakonieczny Jan Senatorski Institute of Precision Mechanics Warsaw PolandBelorussian National Technical University Minsk BelarusInstitute of Precision Mechanics Warsaw PolandInstitute of Precision Mechanics Warsaw Poland

The paper presents the results of wear and metallography tests of tool steel grades: ASTM A681, Chl2M and CH12FS per COST, AMS 6437E i BS X46Crl3, all surface hardened by the Carbo process (carburizing) and by the NiCar process (nitrocarburizing). The thermo-chemical treatment was conducted in powder pack for a duration of 6 h (carburizing) and for 4 h in the case of nitrocarburizing. Factors investigated were: morphology, depth and microhardness of the cases obtained, their microstructure, as well as phase composition. Wear tests were conducted by the three cylinder-cone method. Wear velocity was 0.58 m/s, unit load was 50 MPa and 400Mpa, wear path was 3470 m. Oil SAE30 was applied at the rate of 30 drops per minute.

关键词：氮碳共渗工具钢加工动力学渗碳层厚度显微硬度磨损

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