Browsing by Subject "hydraulic fracturing"

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Access status: Open Access ,
Advanced well stimulation method applying a propellant based technology
(2008) Krilov, Zoran; Kavedžija, Boris; Bukovac, Tomislav
The world oil industry practice, during over the century of its history developed widely known conventional methods of well stimulation. Recently, an advanced well stimulation method, based on implementation of high energy (HE) materials (special explosives, propellants or rocket fuels), has shown to be competitive. The basic principles of propellant based well stimulation technology, employing propulsive thermo-chemical reaction for generation the multidirectional fractures inside reservoir rocks around the wellbore and laboratory investigation of original permeability modification on core samples due to propellant treatment are explained. Also, the well treatment procedure, using high energy gas fracturing tool, applied at two onshore oil wells in Croatia is described along with post stimulation well production results.
Access status: Open Access ,
Aktualne możliwości komputerowej symulacji szczelinowania hydraulicznego w złożach
(2012) Wojnarowski, Paweł; Stopa, Jerzy
Celem pracy jest analiza aktualnych tendencji światowych w modelowaniu komputerowym zabiegów szczelinowania hydraulicznego a także ocena możliwości technicznych i przydatności wybranych symulatorów szczelinowania do projektowania zabiegów w różnych warunkach geologicznych, w tym dla złóż niekonwencjonalnych. W ramach pracy dokonano oceny przydatności oprogramowania GOHFER oraz Meyer Fracturing (MFrac i MShale) do prac projektowych zabiegu szczelinowania hydraulicznego, optymalizacji parametrów technologicznych oraz prognozowania produkcji. W tym celu wykonano testowe obliczenia symulacyjne z wykorzystaniem tych narzędzi.
Access status: Restricted ,
Aktualne warunki hydrogeologiczne na wybranym fragmencie obszaru koncesyjnego w celu określenia stanu początkowego przed rozpoczęciem procesu szczelinowania przy eksploatacji gazu łupkowego
(Data obrony: 2014-09-30) Kopacz, Mateusz
Wydział Geologii, Geofizyki i Ochrony Środowiska
This thesis presents the results of the research, which was carried out in a part of the concession area (provided for exploration and extraction of shale gas, “no “28/2007p Wierzbica”), located near to exploration well Syczyn OU-1 (horizontal part of this well is called Syczyn OU-2K). In this thesis there is information about occurrence of shale gas formations, specifications of methods used in exploration and extraction (especially hydraulic fracturing) and its potential impact on groundwater. In main part of this thesis there is detailed description of research area and analysis of both archival and collected during field work data, including: presence of groundwater formations, hydrodynamic field, chemical composition of water, hydrogeological parameters of the aquifer, vulnerability to contamination and recharge/drainage conditions. In summary there are recommendations for groundwater monitoring.
Access status: Open Access ,
An analysis of fluids after hydraulic fracturing in the aspect of their further use or neutralization
(2013) Jamrozik, Aleksandra; Gonet, Andrzej; Czekaj, Lucyna
Today’s ecological policy focuses on preventing anthropogenic environmental hazards. A large share of activities are oriented to the precise recognition of hazards and use of solutions thanks to which the negative environmental effects of mining activity can be considerably reduced. Issues related to the recovery of water after hydraulic fracturing with emphasis on the possible utilization and management of fluids after hydraulic fracturing in Polish conditions are discussed in view of the respective law.
Access status: Open Access ,
An analysis of the influence of fracturing technological parameters on fracture propagation using numerical modeling
(Wydawnictwa AGH, 2017) Dudek, Jacek; Janiga, Damian; Wojnarowski, Paweł
Nowadays, hydraulic fracturing is one of the most common treatments for both conventional and unconventional fields, a stimulation technique designed to increase well production through the reduction of flow resistance caused by the drilling process or genuine reservoir properties. In this article the planar, three-dimensional numerical model of hydraulic fracturing treatment is presented. Based on the given model, the influence analysis of the basic technological parameters of the fracturing in a directional well on fracture propagation was conducted. The presented analysis shows the crucial role of numerical modeling in the process of hydraulic fracturing treatment design. The outcomes allowed us to identify the sensitivity of the obtained fracturing effects on the change of the treatment of technical parameters.
Access status: Open Access ,
Analysis impact fracturing fluid acidity on structural strength of crosslinked gel complex
(2017) Krzeczek, Piotr; Karasek, Paweł; Wojnarowski, Paweł
Nowadays hydraulic fracturing is the most commonly used technique to stimulate the productivity of a well. The selection of a proper fracturing fluid is all about choices which strongly influence on effectiveness of the treatment. It should be carefully prepared, supported by lab analysis in order to match fluid to reservoir condition. This article concerns impact of fracturing fluid additives on fluid properties. In the paper crosslinking process has been shown and its importance on conventional reservoir rocks fracturing treatment. Provided lab examination shows fluid pH impact during creation crosslinked gel complex including influence to crosslinking time in the surface condition. The lower linear gel pH caused lower crosslinking time of fracturing fluid.
Access status: Open Access ,
Behavior of hydraulic fracture propagation in naturally fractured reservoir
(2013) Thiam, Moussa; Knez, Dariusz
The natural discontinuity or local separation in the plane, which separates the rock in two or many parts, can provide the permeability for fluid movement as water, oil and gas. In low porosity reservoirs, the natural fracture can store a large quantity of hydrocarbons that can be recovered at very high rates. It play a very important role in the minerals exploitation, especially in the sectors of mining and energy which gave an important boost to humanity through the industrial revolution and its associated benefits. So, it is essential to understand the behavior of natural fractures under the influence of other factors such as hydraulic fractures in reservoirs. This paper takes into consideration three models, analyze their results context and ultimately use of new computer program, developed in The Drilling and Geoengineering Department, to make all the necessary operations for each model and give us the results based on provided data.
Access status: Open Access ,
Computer simulation of the influence of proppant high diameter grains damage on hydraulic fracturing efficiency
(2017) Knez, Dariusz; Ziaja, Jan; Piwońska, Monika
Throughout the past two decades, there has been a great intensification of research on processes related to hydraulic fracturing. One of the most significant issues is the behavior of proppants under reservoir conditions. It clearly influences the oil production from the stimulated borehole. Quick loss of a fracture conductivity after hydraulic fracturing may be caused by migration of particles into the porous area of the fracture. Another effect is creation of small solid particles as a result of proppant crushing. Mineral sedimentation may occur on grains propping the fracture because of chemical reactions at the area of contact between the proppant and the mixture of reservoir water and the fracturing fluid. The effect of these reactions is changes in the porosity of the proppant package and conductivity of the fracture. The article presents results of a computer simulation of parameter changes of the proppant in reservoir conditions and their influence on oil production. One of paramount factors is proppant grains damage. As a result of a computer simulation, using Fracpro software, the level of decreased conductivity of the fracture was determined. It was also defined that the influence of this phenomenon on lower production in comparison to the situation where proppant damage is not accounted for.
Access status: Restricted ,
Detection and location of microseismic events induced by hydraulic fracturing
(Data obrony: 2013-11-06) Cieplicki, Robert
Wydział Geologii, Geofizyki i Ochrony Środowiska
In this work I develop and apply a detection and relative location method for microearthquakes induced by hydraulic fracturing. This method is based on cross-correlation stacking for a surface microseismic array and uses both P- and S-wave. I show that similarity of waveforms generated by microearthquakes allows for detection of weak ones (‘slaves’) by cross-correlation with stronger (‘master’). To that end, I stack cross-correlations along moveout of the master event. Further, I show how adjustment of this moveout before stacking by adding differential traveltimes enables location of slave events relative to a master with high precision. I successfully apply described method to real data and find the results of detection and location consistent with migration-based commercial processing. Crosscorrelation stacking improved the results by detecting 20% more events then migration. In the aspect of relative location, application of both P- and S-wave significantly reduced vertical uncertainty of microearthquakes compared to using only P-wave.
Access status: Open Access ,
Elements of reservoir simulation for tight gas reservoirs with water influx
(AGH University of Science and Technology Press, 2021) Sowa-Zyzańska, Magdalena
At present, gas obtained from unconventional deposits plays an important role in the global economy as an energy factor. The simulation of the exploitation of this type of deposits is very complex and requires an individual approach for each case, which is extremely inspiring and interesting, therefore this article attempts to deal with the problem of modeling the extraction of natural gas from tight unconventional deposits. Extraction of tight gas requires the use of measures that stimulate this process and requires an unusual approach both at the stage of deposit recognition, its drilling and exploitation. Using computer programs, more and more accurate models are developed taking into account almost all known processes occurring in the deposits during exploitation, which significantly influences the better selection of parameters of wells and operations that intensify the production, and thus improves the results of exploitation.
Access status: Open Access ,
Emission of pollutants into the air during exploration of coalbed methane
(Wydawnictwa AGH, 2018) Łukańko, Łukasz; Macuda, Jan
Coalbed methane is usually utilized by gas well drilled from the surface. In order to increase the coefficient of methane exploration from coal seams, in a horizontal section of the well, hydraulic fracturing operations are applied. Drilling process and hydraulic fracturing operations involve emission of pollutants to the air from the fuel combustion process. In the case of drilling operations fuel is used to generate electric power, which drives the drilling device and its components, while during hydraulic fracturing to drive high-pressure pump engines.
Access status: Restricted ,
Estymacja energii mikrowstrząsów powstałych w wyniku szczelinowania hydraulicznego
(Data obrony: 2019-01-29) Mika, Iwona
Wydział Geologii, Geofizyki i Ochrony Środowiska
Monitoring otworowy umożliwia rejestrację wstrząsów mikrosejsmicznych powstałych w wyniku szczelinowania hydraulicznego. Ma również swoje zastosowanie w tworzeniu modeli niezbędnych do stymulowania złoża. Na podstawie rekordów obliczane są parametry wstrząsu m.in. magnituda oraz energia. Do ich estymacji zastosowano zmodyfikowaną metodologię, która dla monitoringu powierzchniowego znacząco poprawia otrzymywane wartości. Fragmenty kodu oraz figury w pracy dotyczą zdarzenia mikrosejsmicznego o magnitudzie 0.5, natomiast wyniki – wszystkich czterech wstrząsów dostępnych do analizy.
Access status: Restricted ,
Gaz łupkowy. Technologia wydobycia. Odwierty poziome i szczelinowanie hydrauliczne. Wpływ na środowisko
(Data obrony: 2017-01-19) Kowal, Katarzyna
Wydział Geologii, Geofizyki i Ochrony Środowiska
Gaz łupkowy jest jednym z typów złóż niekonwencjonalnych gazu ziemnego. Jego eksploatacja rozpoczęła się od XIX wieku. Główne złoża usytuowane są w Stanach Zjednoczonych i Kanadzie. Ważnymi badaniami w celu rozpoznania złoża są badania sejsmiczne i geochemiczne. Podstawowym parametrem skał jest zawartość węgla organicznego oraz refleksyjność witrynitu. Gaz wydobywa się za pomocą szczelinowania hydraulicznego i odwiertów poziomych. Eksploatacja gazu z łupków niesie ze sobą konsekwencje środowiskowe.
Access status: Open Access ,
Hydraulic fracturing and U.S. water policy
(2013) Burnett, J. Weslev
Access status: Open Access ,
Hydraulic fracturing in systems of geothermal energy utilization (EGS, HDR)
(2012) Śliwa, Tomasz; Szura, Marcin; Gonet, Andrzej; Sapińska-Śliwa, Aneta
This work reviews possibility of using the heat from impermeable hot dry rock formations. Significant development in hydraulic fracturing technique in a last few years have a result in making accessible sources of energy from impermeable rocks, including hot dry rocks, which wasn't possible before. This paper presents the idea of utilization the EGS system which is based on forced and closed water circulation in a natural and permeable geological reservoir or in a reservoir, where the fractured zone was created artificially by for example hydraulic fracturing treatment. The article shows also an examples of recent EGS/HDR systems around the world.
Access status: Open Access ,
Hydraulic fracturing optimization framework based on PKN and Cinco–Ley methods
(2017) Budzowski, Radosław; Janiga, Damian; Czarnota, Robert; Wojnarowski, Paweł
In an era of decreasing number of discoveries of conventional hydrocarbon reservoirs, in the global oil and gas industry we can observe growing interest in unconventional resources. Conducting effective production from this type of reservoirs is associated with carrying out the intensification processes of production, among which hydraulic fracturing is the most popular. Fracturing project design consist of several technological parameters, i.e. the type of fracturing fluid and quantity of proppant, which have a direct impact on the process effectiveness. The actual shape of the fracture is difficult to predict due to the local heterogeneity of the reservoir and the superposition of the phenomena occurring during stimulation treatment. In this paper optimization model was proposed, which allows for selection appropriate parameters of fracturing technology. Developed optimization algorithm is based on two-dimensional PKN fracture model and Cinco–Ley analytical method. Optimization method used in this paper based on nature – inspired algorithms which were compared with gradient method.
Access status: Open Access ,
Integrated model of hydraulic fracturing and hydrocarbon production
(2014) Stopa, Jerzy; Wojnarowski, Paweł; Janiga, Damian
The dynamics of discovering conventional hydrocarbon reservoirs has significantly dropped down in the World over the last ten years. Resources deposited in reservoirs having poor properties, where the production with economically justified yield is possible after prior enhancement (hydraulic fracturing in particular), become more important. Accordingly, proper designing of development works and hydraulic fracturing are decisive. Author's methodic and software for integrated modeling of hydraulic fracturing and production with the use of a 3D fracture model are presented in this paper. This can be used for evaluating the efficiency of the fracturing treatment and its optimization. The results of hydraulic fracturing modeling were implemented in the reservoir simulator with the software written in C++. The designed fracture can be introduced into a numerical grid of a reservoir simulator. This tool can be a choice for a quick variant simulation for the best scenario of reservoir development selection. The practical implementation of this program was presented on the example of a »tight gas« reservoir.
Access status: Open Access ,
Methodics of assessing environmental noise emission while performing hydraulic fracturing operations in shale formations
(2016) Łukańko, Łukasz; Macuda, Jan
Hydraulic fracturing operations performed at the stage of gas prospection in shale formations are aimed at opening out gas residing in rock micropores. Large quantities of fracturing fluid, with physicochemical composition adjusted to their properties, are injected to the selected interval of a horizontal well. Finally, sand (proppant) is injected along with the fracturing fluid to support the newly formed fracture. The results of a computer simulation of noise emission generated by high pressure pumps during hydraulic fracturing operations, and the results of noise measurements during such work in the north of Poland are presented in the paper. The analysis of the obtained results revealed that the noise standards for day hours in the residential area localized ca. 320 m from the well pad was not exceeded for the hydraulic fracturing operations. The noise level in the night hours was considerably higher, therefore a respective sound berm should be construed.
Access status: Open Access ,
Oil production technology for unconventional reservoirs
(2015) Stopa, Jerzy; Czarnota, Robert; Wojnarowski, Paweł; Janiga, Damian
Interest in the subject related to the oil production from unconventional hydrocarbons has increased in recent years. Operation of such reservoirs requires the use of the state-of-the-art technology. Definitely, drilling horizontal and multilateral wells in conjunction with hydraulic fracturing and acidizing meet that requirement. This paper discusses the most important from the author’s view issues, including artificial lift systems, connected with oil production from unconventional reservoirs around the world and its applicability for Polish hydrocarbons reservoir.
Access status: Open Access ,
Rozwój metod stymulacji złóż węglowodorów
(2007) Kasza, Piotr
Last decade it is period of dynamic development of stimulation methods and technologies. The first stage of this was purchase of new stimulation service and stimulation laboratory equipment. It allows to introduce new technologies for industry use. The new technologies was prepared for two types of stimulation acivities. The first on is hydraulic fracturing. New kind of stimulation fluids and new proppants were prepared to increase treatment efficiency. The second area of activities is development of novel acid fracturing and matrix acidizing methods. New technologies of gelled and emulsified acid were prepared for industry use. All prepared technologies are used for stimulation treatment of oil and gas wells in Poland and abroad.