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1
Content available Experimental study on the flowback of a carboxymethyl hydroxypropyl guar gum fracturing fluid with good temperature resistance
Dai Xiaodong, Li Lei, Zhang Xin, Cheng Zhensong
Journal of Theoretical and Applied Mechanics
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2022
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Vol. 60 nr 4
733--744
EN
For unconventional oil and gas reservoirs such as shale oil and gas as well as tight oil and gas, hydraulic fracturing generally enhances oil recovery. However, the flowback rate of the residual fracturing fluid is low. The residual fracturing fluid in the fracture or the rock ma- trix can reduce relative permeability of oil and gas, and the production rate will decrease. Therefore, it is necessary to study the factors that affect the flowback rate of the fracturing fluid. Most previous studies used the slot model, and viscous and capillary forces explain stable discharge in porous media. The conclusions were only a primarily qualitative analysis. The factors from experimental studies were not comprehensive, and they did not consider the influence of gravity. There are few studies on unstable drainage in porous media un- der different displacement directions. This paper presents a carboxymethyl hydroxypropyl guar gum fracturing fluid with good temperature resistance, and a fracturing fluid flowback experiment is carried on. The effects of the displacement direction, injection pressure, inter- facial tension, fracturing fluid viscosity, and proppant wettability on the flowback rate are analyzed. The research results can provide formulation of the on-site construction scheme.
2
Analiza wpływu procesów kolmatacyjnych na sprawność wybranej ciepłowni geotermalnej
Noga B., Mazur M., Kosma Z.
Modelowanie Inżynierskie
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2017
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T. 34, nr 65
83--89
PL
Celem pracy było przeprowadzenie analizy wpływu procesów kolmatacyjnych na sprawność działania instalacji geotermalnej w miejscowości Pyrzyce (województwo zachodniopomorskie). Jest to ciepłownia pracująca w dublecie geotermalnym (otwór wydobywczy i otwór chłonny). Analizie poddano mechanizmy powstawania kolmatacji otworów chłonnych oraz ich wpływ na ciśnienie zatłaczania i wydajności zatłaczania. Przedstawiono działania podejmowane na przestrzeni lat mające na celu przeciwdziałanie kolmatacji.
EN
The aim of the study was to analyze the effect of clogging processes on the performance of the geothermal installation in Pyrzyce (West Pomeranian Voivodship). This is a heating plant works in geothermal double (excavation wellbore and an absorptive wellbore). Analyze mechanisms of clogging absorptive wellbore and their effect on the injection pressure and injection performance. Show the actions taken over the years to counteract clogging proces.
3
Content available Research injection pressure with the Kistler 4067E pressure transmitter on Sulzer engine 3AL25/30
Cuper-Przybylska D., Wysocki J.
Journal of KONES
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2017
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Vol. 24, No. 3
29--36
EN
Commonly used in the shipbuilding are combustion piston diesel engines that serve as power generators and main propulsion engines. More stringent of environmental regulations, however, require a more detailed understanding of the processes involved in piston engine combustion to reduce emissions to the environment. Also, the main reason for interest in research in the injection system is also the desire to obtain the highest piston engine power at the lowest fuel consumption. The article presents a study of changes in fuel injection pressure, which allows the operator to analyse the thermodynamic processes taking place in the cylinder. The injection pressure measurement allows you to make proper operating, maintenance and even repair decisions on the object under test. The purpose of this article is to investigate the operation of the injection pressure sensor and to compare the pressure curves measured by the Kistler 4067E sensor in various piston engine-operating states and the simulated failures of the SULZER 3AL25/30 diesel engine. The study was conducted on the SULZER 3AL25/30 engine at the Marine Engine Laboratory at the Gdynia Maritime University. Tests carried out with a measuring instrument for sampling are equipped with a Kistler 4067E pressure transducer, a Kistler 4624A amplifier and a Unitest 2008 computer system serviced with a recorder, processing and signal recording. For a thorough analysis, research conducted at different loads and different simulated engine failure.
4
Content available remote Metody osuszania budynków
Redakcja miesięcznika Izolacje
Izolacje
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2016
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R. 21, nr 10
51--53
PL
W artykule przedstawiono inwazyjne i nieinwazyjne metody osuszania budynków. Omówiono metodę podcinania murów, podmurowywania ław fundamentowych, wbijania w ścianę blach ze stali nierdzewnej, iniekcję, elektroosmozę oraz różne sposoby osuszania sztucznego. Podjęto próbę oceny skuteczności wymienionych rozwiązań
EN
The article presents certain invasive and non-invasive methods of drying buildings. The discus-sion covers wall undercuts, strip footing substructures, stainless steel sheets inserted into walls, injection, electro-osmosis, and various methods of chemical drying. An attempt is also made at assessing the performance of the presented solutions.
5
Content available Badania i analiza wpływu ciśnienia wtrysku na rozpylenie paliwa w komorze o stałej objętości
Idzior M., Stobnicki P., Pielecha I., Czajka J.
Combustion Engines
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2013
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R. 52, nr 3
811--819
PL
W artykule przedstawiono wyniki badań wpływu ciśnienia wtrysku na rozpylenie paliwa na pozasilnikowym stanowisku badawczym w komorze o stałej objętości. W pierwszej jego części zawarto informacje dotyczące obiektu badań oraz zaprezentowano opis stanowiska wykorzystanego do badań interakcji strugi paliwa i ścianki tłoka. W drugiej część artykułu opisano metodologię wykonanych badań oraz przedstawiono wstępną analizę zmian jakości rozpylenia paliwa z wykorzystaniem metody szybkiego filmowania dla pojedynczego wtrysku paliwa.
EN
In the article findings of the influence of the injection pressure on spraying fuel were presented on pose engine research position in the chamber about the fixed volume. In first his part they entered into information concerning the object of examinations, as well as a description of the position used for examinations was introduced to interaction of the stream of fuel and the wall of the piston. In second the part of the article was described methodology of performed examinations and a preparatory analysis of quality changes of spraying fuel with using the method of fast filming, for the isolated fuel injection was described.
6
Content available Effect of the parameters of pilot dose injection in a dual fuel diesel engine on the combustion process
Wierzbicki S.
Journal of KONES
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2011
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Vol. 18, No. 3
499-506
EN
The paper presents the effect of the main parameters of pilot dose ignition: injection pressure, injection advance angle and injector opening time on the combustion process in a dual fuel diesel engine. The study continues the research conducted at the Department of Mechatronics of the University of Warmia and Mazury, Olsztyn, on optimisation of dual fuel self-ignition engines with CNG as the main fuel dose. The results presented in the paper were obtained with a single-cylinder engine HATZ 1B40, adapted to methane combustion. The results presented in the paper show the recorded changes of pressure in the combustion chamber with a constant fuel pilot dose and different ignition advance angles. Scheme of fuelling and measurement systems, view of engine indicating system, average changes of pressure in the combustion chamber, average changes of pressure in the combustion chamber and average changes of pressure in the combustion chamber at dual fuel engine supply with diesel oil at varied pilot dose injection angle, effects of advance angle of the pilot dose injection on the maximum pressure of combustion, at various proportions of diesel oil and CNG, average changes of pressure in the combustion chamber at double-fuel engine fuelled with diesel oil and various shares of methane in the dose powering the engine, CNG consumption as a function of the advance angle of the pilot dose injection for various shares of the pilot dose are presented in the paper.
7
Content available The effect of fuel injection parameters on the combustion process in a self-ignition engine
Imiołek M., Piętak A., Wierzbicki S.
Journal of KONES
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2010
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Vol. 17, No. 3
143-148
EN
This paper presents the effect of the main parameters of fuel injection, such as injection angle and injector opening time, on the combustion process in a self-ignition engine. The study continues the research aimed at optimising the bi-fuel feeding of self-ignition engines with a main fuel dose of methane (CNG). The results described in the paper apply to a HATZ 1B40 one-cylinder engine, which was adapted for being powered with methane. Examinations of the engine powered with a pilot dose of mechanically-injected diesel oil revealed the necessity to adjust the fuel injection advance angle. To this end, the mechanical system offuel supply was replaced with a Common Rail, with controllable fuel injection pressure, fuel injection advance angle and injector opening time. The results presented in the paper show the characteristics of the injector output depending on the fuel pressure in the Common Rail and on the duration of the electric impulse which opens the injector. Moreover, the article presents examples of pressure courses in the combustion chamber at a constant fuel dose and with a different fuel injection advance angle. An example of the combustion pressure course at a constant fuel dose and variable injection pressure and injector opening time is given.
8
Content available Optimization of injection pressure for fuel consumption and exhaust emissions in a dimethyl ether (DME) engine with a common rail type injection system
Yanai T., Konno M., Sato Y., Oikawa H., Nozaki S.
Journal of KONES
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2010
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Vol. 17, No. 2
511-518
9
Content available Fuel feed to diesel at a start regime
Fedyanov E., Slavuckiy V., Kanygin Z., Slavuckiy V.
Journal of KONES
|
2009
|
Vol. 16, No. 1
111-116
EN
Some factors defining starting properties of diesel engines are considered. Features of process of fuel feed on a starting mode are analyzed. Basic possibility of steering by processes of mixture forming and combustion is proved at a small speed of a crankshaft. Developed a design procedure of process of fuel feed in a diesel engine at a start regime. On the basis of the theory of transients in a fuel system, the reasons of deterioration of indicators of fuel feed process are explained at a start regime of diesel engine. Possibilities of a method of increase of initial pressure in a delivery highway by prostrating scrolling of a crankshaft with idle spray jets are investigated. The method of intensification of fuel feed process patented by authors used in diesel engine at a start regime. The results of numerical experiments confirming improvement of indicators of process of injection at high-speed speeding up of the pump of a high pressure are resulted: Increase maximum and an average pressure, cutting-down of duration of fuel feed process. The paper concentrates on possibility of improving fuel fed process at the starting regime by means of high speed forcing the fuel pump and the initial pressure rising by an earlier camshaft rotation with out of work injectors.
10
Content available The Influence Of Mutual Angle Position Of Main, Pilot And Preinjection Dose On Fuel Dosing In Common Rail System
Balawender K., Kuszewski H., Lejda K., Ustrzycki A.
Journal of Polish CIMAC
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2008
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Vol. 3, no 1
9-13
EN
The common rail fuel supply systems on account of flexibility at injection characteristic shaping, are the most frequently applied fuel supply solution in Diesel engines. The most essential parameters, which have the effect on fuel dosing precision are injection duration, rail pressure and fuel temperature. Also there are other factors, which can cause fuel dosing errors. It might be also other factors caused by specific working of fuel system. The split of fuel dose into a few parts (for example into pilot dose, preinjection dose and main dose) can cause pressure fluctuation in rail and also in the whole system. Next this can cause a chang of set fuel dose. In the article research results connected with influence of mutual angle position of main, pilot and preinjection dose on the total fuel dose. The researches were conducted with test stand equipped with test bench Bosch EPS-815 with electronic measuring of fuel dose. Control of injector was realized by using worked out controller which enables to split of fuel dose into three parts.
11
Content available remote Effect of injection pressure on CI engine performance using orange skin powder with diesel as a solution
Purushothaman K., Nagarajan G.
Silniki Spalinowe
|
2007
|
R. 46, nr SC2
67-73
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