Stopa, Jerzy
Loading...
Email Address
Employee
aktywny
Alternative name
Discipline
inżynieria środowiska, górnictwo i energetyka
Author Profiles
Systemy AGH
23 results
Search Results
Now showing 1 - 10 of 23
Item type:Article, Access status: Open Access , Optimization of well placement and control to maximize CO₂ trapping during geologic sequestration(2016) Stopa, Jerzy; Janiga, Damian; Wojnarowski, Paweł; Czarnota, RobertThe $CO_{2}$ injection into geological formations such as saline aquifers can be effective method of sequestration enabling efficient immobilization of gas by surface and capillary forces. The main objective of presented method of optimization was to determine optimal well position and injection rates that maximize residual trapping. This would mitigate the risk of the $CO_{2}$ leakage outside of storage zone. A genetic algorithm and particle swarm optimization have been developed and coupled with reservoir simulator to optimally examine various placement and injection control strategies for vertical as well as horizontal well. Optimization was carried out in 3D heterogeneous real field model with water-$CO_{2}$ -formation rock relationship. Numerical examples confirm that developed algorithm can find a promising optimal solution effectively within a partial number of simulation runs.Item type:Article, Access status: Open Access , Prospects for development of the oil market in the world(2017) Rychlicki, Stanisław; Stopa, JerzyCrude oil and natural gas were in the twentieth century and are still the most important strategic resources, which determine many aspects of politics and the world economy. The price level and the availability of oil and gas has a huge impact on the economic situation of all countries of the world. The developments in the oil market were the cause of many wars. The use of oil on an industrial scale it was observed at the end of the nineteenth century and once was considered the most effective source of energy for universal use. Since then, a steady increase of its share in the energy balances of the World. Growing automotive industry in the early twentieth century was also an important factor in increasing the use of oil, which is then processed in many emerging refineries. All this led to the development of the oil industry, which has become an alternative to coal as the main fuel so far. However, a major breakthrough in the use of oil occurred only after the Second World War, when began to rapidly develop such industries as chemical-based oil or plastics industry. This article presents information on traditional and prospective areas where oil deposits in the world and its resources as well as international trade, price formation in the market and prospects of development of the oil market in the world.Item type:Article, Access status: Open Access , An optimization model for managing compressors in salt cavern gas storage(2013) Stopa, Jerzy; Mrzygłód, RafałThe article presents issues related to technical and economic optimization of filling underground gas storage in salt cavern (CUGS) on the example of Mogilno. Operation practice suggests that the first step is to inject the caverns with a high convergence, then with smaller and at the end caverns with the smallest convergence. In the withdraw process, the situation is reversed. On the other hand, the gas injection into the deepest caverns requires more compressor power. Optimization that takes into account only the speed of storage caverns convergence is not ideal. While injecting gas into storage caverns, compressors typically use about 1–3% of the transported gas, depending on the management of compressors operation. Taking into account the amount of gas supplied to the CUGS Mogilno, the cost of fuel gas that is used can be significant. In the liberalized gas market an underground gas storage operator will have to account carefully and buy fuel gas at market prices. These facts raise an important question: how to manage the operation, in a free gas market in the most efficient way which affects the profitability service storage provision in underground gas storage in salt caverns. This paper presents the optimization model, developed by the authors, that minimizes the consumption of fuel gas, while preventing overdependence loss of underground salt caverns volume, during the gas injecting process into storage caverns.Item type:Article, Access status: Open Access , Microscale modeling of CO₂-EOR process in coupling with laboratory measurements(2017) Janiga, Damian; Czarnota, Robert; Stopa, Jerzy; Wojnarowski, PawełApplication of enhance oil recovery methods (EOR) as carbon dioxide injection ($CO_2$-EOR) can increase technological or economical production indicators. For the evaluation of process effectiveness, full scale simulation model is used. Numerical models require large number of high quality geological and production data. However, the necessary data may be uncertain therefore microscale laboratory experiment and modeling can provide a knowledge to understand the fluid flow phenomena. In this paper the authors propose an integrated decision model coupling laboratory measurements of displacement with the numerical simulation of flow. First step consists of routine rock properties determination, after that core sample geometry, porosity and permeability were reconstructed in numerical reservoir simulator. Simple core model was combined with relative permeability measurements for oil - water and oil - carbon dioxide as well as fluid properties. Calibrated to laboratory measurements simulation model was used to analyze the process of $CO_2$-EOR and evaluation of its effectiveness depending on technological parameters.Item type:Article, Access status: Open Access , Analysis and selection of CO₂ sources for CCS-EOR projects in oil fields clusters in Poland(Wydawnictwa AGH, 2018) Mikołajczak, Edyta; Kosowski, Piotr; Stopa, Jerzy; Wartak, JoannaArticle contains a detailed analysis and a preliminary selection of potential CO? emitters that can supply gas for CCS-EOR projects in oil fields clusters in Poland. The idea of $CO_2$ injection into clusters arises from the fact that oil reservoirs in Poland are relatively small, but very often located close together. Reservoirs grouping significantly increases the potential storage capacity and improves economic indicators. In addition, CCS-EOR projects combine $CO_2$ storage (CCS) with an increase in production from mature oil fields (EOR). The analysis was performed using a database of carbon dioxide emitters in Poland created by the National Centre for Emissions Management. This database contains a list of all registered $CO_2$ producers with annual emissions exceeding 1 Mg. On this basis, potential $CO_2$ sources for previously selected four clusters of oil reservoirs were chosen.Item type:Article, Access status: Open Access , Laboratory measurement of wettability for Ciężkowice sandstone(2016) Czarnota, Robert; Janiga, Damian; Stopa, Jerzy; Wojnarowski, PawełThe type of reservoir rock wettability is one of the most important factors affecting flow of formation fluids in rock pores. It impacts on the characteristics of capillary pressure curves and residual oil saturation, what result in final recovery factor. There are generally, four differ states of wettability for hydrocarbon fields. These are: water wet, oil wet, mixed and fractional. For determination of wettability both quantitative and qualitative methods are implemented. In presented work, the results of wettability laboratory measurement for Ciężkowice sandstone by Amott–Harvey has been shown. Obtained outcomes underline the influence of wettability phenomena on the recovery factor for Carpathian hydrocarbon fields, where Ciężkowice sandstone is the oil bearing formation. The proper understanding of the wettability of reservoir is essential for determining the most efficient way of oil production.Item type:Article, Access status: Open Access , Laboratory experiments for crude oil removal from water surface using hydrophobic nano-silica as sorbent(2014) Knapik, Ewa; Stopa, JerzyNanomaterials have a great potential for the possible oil spill cleanup due to their unique wettability characteristics and large surface area. This work reports investigations on oil sorption behavior of a commercially available hydrophobic nano-silica when tested with a light paraffinic crude oil and a heavy aromatic crude oil. Sorption experiments were carried out in batch sorption system under static and dynamic conditions. Influence of mass of sorbent, sorption time, temperature and pH value of water on sorption capacity were tested and compared to find an optimal operational conditions for adsorption process. Nanopowder exhibited high selectivity for absorbing oil from water; a removal efficiency found by gravimetric method was high as 96% to 99%. The sorption capacity inereases with the inerease of sorption time and mass of sorbent. Nano-silica powder was found to be effective sorbent material as compared to widely used synthetic fibers.Item type:Article, Access status: Open Access , Enhanced Oil Recovery methods on offshore fields in the light of world literature(2014) Bednarz, Paweł; Stopa, JerzyEnhanced Oil Recovery methods (EOR) are known since long time, but in recent years they have been used primarily in the U.S. mostly for research purposes. The increased interest in their use was in the 70's of the twentieth century, and associated with the increase in oil prices. Currently for several years there has been a return to the these methods, including offshore fields. Experience in the application of EOR methods in Poland is small, currently no exploitation is carried out using them. The purpose of this article is to present the current trends and latest technologies in enhanced oil recovery methods in terms of the applicability by the Polish oil companies. Statistical data of current and planned EOR methods in the world with special emphasis on offshore reservoirs is presented. Current trends in technological development of EOR methods are given, both which are still in the phase of laboratory tests and the first tests on fields such as: carbon dioxide flooding, water alternating gas injection, low salinity water injection, carbonated water injection, conventional technologies of polymer gels and thermally activated polymers.Item type:Article, Access status: Open Access , Application of multifunctional fluids to improve hydrocarbon production(2013) Knapik, Ewa; Stopa, JerzyIn the course of the mature gas fields exploitation there are many technical problems including the corrosion damage, formation of hydrates and water cut. In many cases, an effective solution of these problems is the dosage of appropriately selected chemicals. Commercially available corrosion inhibitors, hydrate inhibitors, demulsifiers and foaming agents are injected in a form of single, multifunctional mixture through one liner which reduces injection costs. The paper presents the results of laboratory tests, which aim was to investigate synergism and antagonism in multifunctional mixture containing different commercially available surfactants, corrosion and hydrate inhibitors. Correlations between final product composition and performances such as liquid unloading efficiency, corrosion protection and pour point were studied. The described approach allows to adapt the tertiary mixture composition (foaming agent + corrosion inhibitor + hydrates inhibitor) to the current production conditions. The polarization behavior of electrodes in brines with and without mixture of additives has been studied by a cyclic voltammetric method. The addition of increasing concentrations of each chemicals causes the reduction in the corrosion current density. The measurements using a modified method of the US Bureau of Mines show synergistic effect of surfactants and corrosion inhibitor on foamabilities. Multifunctional mixtures are stable under storage conditions and not cause any compatibility problems with reservoir fluids.Item type:Article, Access status: Open Access , Oil production technology for unconventional reservoirs(2015) Stopa, Jerzy; Czarnota, Robert; Wojnarowski, Paweł; Janiga, DamianInterest 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.
- «
- 1 (current)
- 2
- 3
- »