Browsing by Subject "recovery factor"

Now showing 1 - 6 of 6

Access status: Open Access ,
Analyzing and forecasting the performance of water drive gas reservoirs
(Wydawnictwa AGH, 2019) Lupu, Diana Andreea; Ştefănescu, Dan-Paul; Foidaş, Ion
The manner of estimating water drive gas reservoir recovery can vary considerably. Several mathematical models have been developed for estimating water influx in petroleum industry, but the current paper will address the application of Fetkovich aquifer model to predict the gas reservoir performance considering the pressure changes that gradually occur within the aquifer and between the aquifer and reservoir. The applicability of this model has proven to be extremely useful in estimation of initial gas resources, aquifer volume and its parameters, confirming the producing mechanism but also forecasting the production performance of the gas reservoir. The authors will highlight through some case studies, the importance of the water influx analysis and prediction, in particular for natural gas reservoirs, which subsequently allows for adequate planning in optimizing the reserves' recovery.
Access status: Open Access ,
Comparison of the oil recovery between waterflooding and CO₂-EOR method for the JSt oil reservoir
(Wydawnictwa AGH, 2017) Kulinič, Vitalij; Janowski, Piotr
Exploitation of oil from the reservoir initially is performed by primary methods that use natural energy reserves, that allows for partial exploitation of geological resources (30%). Further oil resources depletion requires the implementation of appropriate methods to support exploitation, secondary methods, consist mainly in the physical oil displacement and third methods, in which additional types of energy aid the process of exploitation. The use of this methods may contribute up to a twofold increase in the degree of the geological resources depletion. One way to increase the exploitation is the injection of $CO_{2}$ into the oil fields ($CO_{2}$-EOR). This gas interacts physically and chemically on the reservoir rocks and oil contained in them, improving the conditions of its production. The technology of $CO_{2}$ injection into the reservoir allows not only to increase oil production, but also gives the possibility of storing this gas in reservoirs, which is beneficial from the viewpoint of its impact on the environment. In the article was made a comparison of the oil recovery effectiveness between waterflooding and $CO_{2}$-EOR method for Jastrząbka Stara reservoir. For this purpose, were made simulations of waterflooding and injecting $CO_{2}$ for selected oil reservoir on the basis of the $CO_{2}$ PROPHET program. We analyzed different variants of injection of water and gas, both the amount of injected media, and the method of injection (only water, only gas, change injection of gas and water). Based on the results of modeling was estimated the amount of oil possible to extract by both methods and the recovery factor of the geological resources of the selected oil reservoir.
Access status: Open Access ,
Microbial flooding increases recovery factor of depleted Pławowice oil field - from lab to the field
(2015) Falkowicz, Sławomir; Cicha-Szot, Renata; Dubiel, Stanisław; Launt, Philip; Nelson, Sidney; Wójcicki, Witold; Rogaliński, Marcin
The paper relates to the application of microbial enhanced waterflooding to improve the recovery factor and extend the productive life of depleted oil fields in the Carpathians Foreland. This technology and the application method used are categorized as Microbial Enhanced Oil Recovery (MEOR). Results of laboratory tests simulating the microbial flooding process in the oil field are presented along with results from the first two years of microbial flooding at Pławowice oil field. In the first two years of field application this MEOR process has increased the production rate of two oil wells by 70% on average above the rate before treatment.
Access status: Restricted ,
Ocena warunków energetycznych oraz stopnia sczerpania geologicznych zasobów karpackich złóż ropy naftowej na przykładzie złoża ropy naftowej Iwonicz-Zdrój
(Data obrony: 2012-07-05) Majkrzak, Marcin
Wydział Geologii, Geofizyki i Ochrony Środowiska
The aim of this thesis is to briefly present the structure of Polish Outer Carpathians (with emphasis on the Silesian Nappe), characterized geological conditions of the Iwonicz-Zdrój anticline, and describe conditions of occurrence of the Iwonicz fold oil accumulation. Recovery factor for oil were determined with application of production-decline curves, and approximate mathematical formula on the sum of partial constituents of the field energy. On the received basic data were predicted possible future resources. With simple mathematical operations using the previously calculated values obtained total deposits of extractable and geological resources Iwonicz-Zdrój oil field.
Access status: Open Access ,
Operations for improving the gas flow in the wellbore adjacent zone
(2016) Şuţoiu, Florinel; Foidaş, Ion; Avramescu, Mihail
During the whole period of a natural gas reservoir exploitation, from the start of production until the total reservoir energy depletion, may apear some phenomena which by their nature can affect the natural gas flow from the layer into the well. The flow resistance greeted by gas in the adjacent borehole may have multiple causes. In the majority of cases, geological elements are those which definitive influence the behaviour in exploitation of those reservoirs, so the existence of some traps due to the continuity and discontinuity character of the porous-permeable medium or to some reservoir parameters with low values, drasticaly reduces the posibility of extraction of a bigger volume of geological gas resource. Also the exploitation performances of gas reservoirs, through different wells, are major affected because of the skin factor. This produces an increased flow resistance in the adjacent zone of the borehole which is a plus to the resistance caused by the hydrodynamic imperfection to the mode and open degree of the productive layer. During the maturity stage of natural gas reservoirs, a special attention is granted to prevention and control of this unwanted effects which may affect natural gas flow from the reservoir into the well, through different operations. The stimulation of these productive layers through different operations aiming the reduction of geological nature constraints, thereby become a complex approach having the finality the increasing of exploitation performances itself. In Romgaz were tested and are used a series of stimulation technologies of the productive layers. From there historic we conclude that perforations or re-perforations using deep penetration tools, acidizing and nitrogen injection are applied with success to the productive wells. Regarding the increasing of the recovery factor for wells with high water income or for wells with mixed flow regime or with water drive regime, were successfully tested the polymer injection technology that helps to maintaining or optimising the productive wells.
Access status: Open Access ,
Optimizing recovery factor in multilayers mature gas field, based on decline curve analysis methodology
(2014) Ştefănescu, Dan-Paul; Iturbe Romero, Yrene; Falk, Isabela
Generally, the mature fields have a good portion of the remaining reserves still trapped due to inefficient drainage, pressure decline, inerease in water cut, sand production and aging of the existing system. This paper addresses a methodology applied on the historical produetion behavior to identify techniques and initiatives to optimize the recovery factor based on redevelopment plans in a mature field. For Laslau Mare field in particular, there have been identified and implemented opportunities such as: infill drilling, work over optimization, dynamie underbalance perforation (DUP), acidizing, kick off with N2, propellant stimulation, snubbing, soaping, sand management, Wavefront Technology stimulation and wellhead and/or group compressor installation