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4 results on '"Valentina Babić"'

1. BUILD UP TEST ANALYSIS OF THE HORIZONTAL WELL

Author

Sonja Koščak Kolin, Marin Čikeš, and Valentina Babić

Subjects
flow regimes in the horizontal wells, build up test analysis, Mining engineering. Metallurgy, TN1-997, Geology, QE1-996.5
Abstract

Build up test analysis for the horizontal well is based upon the theory of fluid flow in the reservoir, which is mathematically described by the diffusivity equation of the three dimensional flow and its solutions. According to the horizontal well model in the infinite reservoir for the case of the unsteady flow, four regimes can be developed: early radial flow, early linear, late pseudo-radial and late linear flow. Solutions of the diffusivity equation, that are used in the build up test analysis, are developed for each of the flow regime, supposing that the well is totally horizontal and placed in the totally homogeneous reservoir with equal formation thickness. In addition, it is considered that the reservoir is isotropic in the horizontal plane, but with the vertical anisotropy, meaning that the vertical permeability differs from the horizontal. Example of the build up test analysis in the computer program Saphir is shown for the horizontal well at the gas field Okoli. Well test data are used in the analysis as the basis for the corresponding well model design. Test data application in the well modelling is significant due to the accuracy that those models can obtain in the determination of the key parameters of the production system forecasting, such as permeability, skin factor, initial reservoir pressure etc. (the paper is published in Croatian).

Published
2013

2. The sculpture of the church of the holy virgin of the Studenica Monastery. Origin and models

Author

Valentina Babić

Subjects
mission of the apostles, Archeology, History, Sculpture, Visual Arts and Performing Arts, media_common.quotation_subject, twelfth-century, Art, Ancient history, enthroned virgin and child, Style (visual arts), architectural sculpture, Motif (narrative), studenica monastery, sedes sapientiae, peopled scrolls, Byzantine art, serbia, lcsh:NX440-632, Parallels, lcsh:History of the arts, media_common
Abstract

The paper deals with the architectural sculpture of the twelfth century Church of the Holy Virgin at the Studenica Monastery. Its parallels with Italian Romanesque sculpture have long been identified in academic literature, and attention has been drawn to the influence of classical sculpture, mostly in terms of style, which has been attributed to the impact of Byzantine art. The paper demonstrates that all the motifs present in Studenica?s sculptural decoration originate from Romanesque sculpture in the Italian regions of Emilia Romagna and Apulia. Most of them rely on ancient Roman models and the motif known as peopled or inhabited scrolls is dominant among them.

Published
2019

3. A sanctuary screen from the island of Kolocep

Author

Valentina Babić

Subjects
Archeology, History, Sculpture, Visual Arts and Performing Arts, media_common.quotation_subject, Art, 11th century, Ancient history, Eleventh, language.human_language, Queen (playing card), CONQUEST, Medieval history, sanctuary screen, Elaphite, Dioclea, language, Wife, lcsh:NX440-632, Serbian, lcsh:History of the arts, Byzantine architecture, Koločep, art, media_common
Abstract

The paper discusses the structure and carved decoration of the restored marble sanctuary screen from the island of Kolocep near Dubrovnik. Based on the early medieval history of present-day southern Dalmatia and the fragmentary inscription commemorating a queen as the donor of the screen, it may be concluded that she was one of the Serbian Doclean (Duklja) queens from the second half of the eleventh century. The inscription is the only evidence that the kings of Dioclea ruled over the Elaphite islands. The carved decoration is typical of the Middle Byzantine period (9th-12th century), with some regional traits. The only exceptions are the figures of putti. They can be associated with Romanesque architectural sculpture in southern Italy created in the late eleventh century, after the Norman conquest of this region. The author puts forward the hypothesis that the donor was Queen Jaquinta, wife of King Bodin (1081-1101), who was a Norman woman from Bari.

Published
2017

4. ANALIZA TESTA PORASTA TLAKA HORIZONTALNE BUŠOTINE

Author

Sonja Koščak Kolin, Marin Čikeš, Valentina Babić, Sonja Koščak Kolin, Marin Čikeš, and Valentina Babić

Abstract

Analiza testa porasta tlaka za horizontalnu bušotinu temelji se na poznavanju protjecanja fluida u ležištu, koje je matematički opisano jednadžbom difuzije trodimenzionalnog protoka i njenim rješenjima. Prema modelu horizontalne bušotine u neograničenom ležištu za slučaj neustaljenog protoka mogu se pojaviti četiri režima protjecanja: rani radijalni protok, rani linearni, kasni pseudoradijalni i kasni linearni protok. Za svaki od navedenih protoka postoje odgovarajuća rješenja jednadžbe difuzije, koja se primjenjuju u analizi testa porasta tlaka, uz glavnu pretpostavku da je bušotina potpuno horizontalna i smještena u potpuno horizontalnom, homogenom ležištu, jednake debljine. Osim toga, ležište se uzima kao izotropno u horizontalnoj ravnini, ali da postoji vertikalna anizotropija, tj. da je vertikalna propusnost različita od horizontalne. Primjer analize testa porasta tlaka u računalnom programu Saphir prikazan je za horizontalnu bušotinu na plinskom ležištu Okoli. U analizi su korišteni podaci ispitivanja kao temelj za postavljanje odgovarajućeg modela bušotine. Primjena mjerenih podataka u modeliranju bušotine značajna je zbog točnosti i pouzdanosti, koju takvi modeli mogu dati u određivanju ključnih podataka za prognoziranje budućih promjena proizvodnog sustava, kao što su propusnost, skin faktor, početni ležišni tlak i sl., Build up test analysis for the horizontal well is based upon the theory of fluid flow in the reservoir, which is mathematically described by the diffusivity equation of the three dimensional flow and its solutions. According to the horizontal well model in the infinite reservoir for the case of the unsteady flow, four regimes can be developed: early radial flow, early linear, late pseudo-radial and late linear flow. Solutions of the diffusivity equation, that are used in the build up test analysis, are developed for each of the flow regime, supposing that the well is totally horizontal and placed in the totally homogeneous reservoir with equal formation thickness. In addition, it is considered that the reservoir is isotropic in the horizontal plane, but with the vertical anisotropy, meaning that the vertical permeability differs from the horizontal. Example of the build up test analysis in the computer program Saphir is shown for the horizontal well at the gas field Okoli. Well test data are used in the analysis as the basis for the corresponding well model design. Test data application in the well modelling is significant due to the accuracy that those models can obtain in the determination of the key parameters of the production system forecasting, such as permeability, skin factor, initial reservoir pressure etc.

Published
2013

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