Numer czasopisma
AGH Drilling, Oil, Gas
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ISSN: 2299-4157
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Data wydania
2017
Rocznik
Vol. 34
Numer
No. 2
Prawa dostępu
Dostęp: otwarty dostęp
Uwagi:
Prawa: dozwolony użytek 
Dozwolony użytek chronionych utworów
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Opis
Rocznik czasopisma (rel.)
Rocznik czasopisma
AGH Drilling, Oil, Gas
Vol. 34 (2017)
Artykuły numeru (rel.)
Artykuł
Tylko metadane
Predicting relative permeability from experimental capillary pressure porous plate test for two phase flow
(2017) Czarnota, Robert; Janiga, Damian; Stopa, Jerzy; Wojnarowski, Paweł
Relative permeabilities relationships as a function of fluids saturation are one of the most important parameters for describing multiphase flow processes in reservoir rocks. When direct laboratory tests are not available for investigating oil-water multi-phase flow in rocks, then indirect prediction techniques using relative permeability functions are widely used, e.g. from capillary pressure test. In this study the measurement of capillary pressure was performed on rocks plugs with different characteristics at reservoir conditions using porous plate method. During measurement semi-permeable membrane was used with 15 bar threshold pressure, what allowed to register formation water saturation, at changing differential pressures steps. Desaturation at each pressure stage was continued until no more produced liquid was observed. Water saturation point at maximum capillary pressure applied is assumed to be final irreducible water saturation. Application of porous plate method provides sufficient stabilization time, allowing to achieve uniform saturation distribution. In this research, Brook–Corey model was used to predict relative permeability from experimental measured capillary pressure data for oil-water phase flow in porous media. As a result, it is possible to obtain more accurate capillary pressure outcomes, and relative permeability curves for the two-phase system, than other methods used in practice. Performing capillary pressure measurements at reservoir conditions, allows to restore the processes occurring in the reservoir.
Artykuł
Tylko metadane
Influence of bentonite addition on parameters of fresh and hardened cement slurry
(2017) Kremieniewski, Marcin; Stryczek, Stanisław; Wiśniowski, Rafał; Rzepka, Marcin; Gonet, Andrzej
The recipe of cement slurry contains a number of additives and admixtures used for obtaining appropriate technological parameters. Some of these agents have a loose form and their density is higher or lower than that of working water, which may result in sedimentation of solid phase. For the sake of eliminating this effect, the viscosity of the working fluid should be increased to keep the fine solids over the entire volume of the slurry. This can be done with the use of appropriate high-molecular polymers. However, bearing in mind the cost of the polymers, bentonite is most frequently applied. Bentonite (montmorillonite) has a packet build and the resulting higher water-demand causes an increase of viscosity of working fluid. It is most frequently used to improve the sedimentation stability, though the presence of this additive is not neutral for the technological parameters of the slurry. During research works aimed at analyzing the influence of montmorillonite on the parameters of fresh and hardened cement slurry predefined quantities of bentonite were used in proportion to the working water. Reference recipes of slurries were worked out to trace the changes. The following properties of the slurry were defined: rheological parameters, filtration, thickening time, water settling, sedimentation stability. For hardened cement samples the bentonite addition was analyzed in view of its influence on the mechanical properties (compressive strength), physicochemical parameters (adhesiveness to steel pipes and adhesiveness to rock formation). Additionally, hardened cement slurry underwent analyses describing the microstructure of the sample porosity and permeability tests). For the sake of determining the influence of mineral additives on parameters of slurry and the hardened slurry there were performer tests for recipes of slurries to be used in wellbore conditions at temperature from 30°C to 90°C and pressure from 5 MPa to 35 MPa.
Artykuł
Tylko metadane
The study of unsteady operation mode of the crude oil trunk pipeline in case of a sudden stop flow
(2017) Fąfara, Zbigniew; Matuła, Rafał; Mazur, Roman
Media pipeline transportation, in particular energy commodities has a very high share in the world economy. It has many advantages over other methods of transmission of the products on land but there are concerns about the safety of the pipeline system. When we are designing the pipeline, we take into consideration maximal discharge pressure of medium, but any change in pumping parameters results the appea rance of an unsteady (transient) process, which in some cases may lead to a rapid increase in pressure. The largest increase in pressure in the pipeline comes at a time of a complete stop fluid flow. There is formed a water hammer, which may cause a major accident up to pipeline leaks inclusive. Subject of considerations in the paper is the analysis of changes in pressure over time in the pipeline obtained in 12 experiments of stop oil pump unit in the trunk pipeline for different pumping parameters and properties of the medium. Based on the recorded changes of pressure in measurement points were fitted regression models allowing to forecast an increase in pressure along the pipeline route caused by water hammer.
Artykuł
Tylko metadane
Application of AHP method to assess the possibilities of using of geological structures located in the aquifers as underground storage sites
(2017) Lewandowska-Śmierzchalska, Joanna; Uliasz-Misiak, Barbara
Decision-making problem with assessing of the suitability of geological structures located in aquifers in terms of their use for carbon storage, natural gas storage or waste injection is mainly connected with the necessity of taking into consideration a large number of criteria and analyze a lot of parameters. It also connected with making many independent decisions concerning geological, environmental, social, political, technical or legal issues. This article shows the possibility of using the AHP method, ie. multi-criteria hierarchical methods to analysis of decision problems in assessment the potential of aquifers. AHP method allows to take reasonable decision. The article was divided into three parts. The first one includes a characteristics of geological structures located in aquifers, special attention was paid to the criteria describing these structures. In the second part, the basis for decision-making system based on the method of AHP, which was used to carry out the hierarchical scoping assessment of potential structures. Validation of decision-making system was realized on selected geological structures located on the Polish Lowlands. An assessment of the possibilities to use the two anticline in the Mesozoic aquifers was made. As a result, received the criteria ranking, rankings of decision variants to all criteria and global ranking of variants. Based on the results obtained can be determine which decision represents a priority way of use structure.
Artykuł
Tylko metadane
Analysis of Drill Stem Test (DST) results at Osobnica oil field, in terms of sampling of selected technology parameters
(2017) Dubiel, Stanisław; Rzyczniak, Mirosław; Solecki, Marek; Maruta, Michał
In this paper results of DST tests obtained in two wells at Osobnica oil field are presented. At the same time there were analyzed and reinterpreted the conditions of these results from the selection of technological parameters and geological conditions. The results of this analysis have been developed in conclusions.
Artykuł
Tylko metadane
Analysis impact fracturing fluid acidity on structural strength of crosslinked gel complex
(2017) Krzeczek, Piotr; Wojnarowski, Paweł; Karasek, 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.
Artykuł
Tylko metadane
Tightness of hydrogen storage caverns in salt deposits
(2017) Ślizowski, Jarosław; Smulski, Rafał; Nagy, Stanisław; Burliga, Stanisław; Polański, Krzysztof
The problem of rock salt massif tightness concerns all stored media. It is particularly important in the case of hydrogen, because of the small size of its molecules. Preliminary results of selected permeability tests performed under the project Hestor are discussed in the paper. The results of numerical calculations determining a potential range of gas leakage are also presented.
Artykuł
Tylko metadane
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.
Artykuł
Tylko metadane
Many years’ extraction of groundwater in the context of established usable groundwater reserves
(2017) Macuda, Jan; Styrkowiec, Ewa
The operation of water supply networks basically relies on the ability of supply water, which in the case of groundwater intakes, is defined by usable reserves offered by the wells involved. Their establishing is the last stage of an investment, i.e. building of groundwater intakes, and their value determines the type of infrastructure and technological hardware in the wells. Owing to the fact that the usable groundwater reserves are conditioned by a number of factors (economic, technological, environmental) their correct determining depends on the correct definition of the number and quality of measurements and hydrogeological observations. In practice, these measurements tend to be shortened to minimum (test pumping) or discarded (diagnostics of well construction) for financial reasons. As a result the user obtains either over- or underestimated information about the intake parameters. Exploitation of a well with overestimated capacity brings about serious technological and economic consequences, starting from the lowered productivity (drop of water table, lower yield), change of chemical composition of water, sanding up of the well as well as well failures and damage. The use of a well with underrated output does not shorten the life of the well, though is disadvantageous for the economic reasons. The productivity of wells can be verified after a few years of controlled extraction, on the basis of which the cost of water extraction, stability of chemical composition or impact on other intakes in given work conditions. Accordingly, this is a basis for updating usable groundwater reserves of the wells. Moreover, after many years of observation of groundwater intakes, one can formulate recommendations warrantying long life of wells, rational management of pump aggregates and well renovation plans.
Artykuł
Tylko metadane
Analysis of the methods for gas demand forecasting
(2017) Apostol, Rostislav; Łaciak, Mariusz; Olìjnik, Andrìj; Szurlej, Adam
Natural gas is a very important and strategic resource. In the structure of the world’s primary energy, its share is currently approx. 25 % and according to the forecasts it will continue to grow. In addition, the transition the large cities to gas as the main energy resource is an effective solution for reducing harmful emissions and improving air quality. The trend of increasing consumption of natural gas causes the complex technical issues, especially the need of accurate forecasting the gas demand, design the new distribution networks and modernization of the existing systems of gas supply. This article presents a review of existing methods for gas demand forecasting based on the gas engineering literature analysis and the approach for the forecasting of gas consumption based on the analysis of the gas consumption diagrams of gas station.