Blar i Department of Petroleum Engineering på emneord "chalk"
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A comparative study on PDC drillbit performance with a 4D dynamic model on samples of late cretaceous chalk for North Sea applications
(Masteroppgave/UIS-TN-IPT/2011;, Master thesis, 2011)The overall goal of this work has been to select the most suitable PDC bit for 8 ½” Chalk-sections located in the North Sea. The Ekofisk field is the largest field in the North Sea and has long sections with Chalk of late ... -
Chemically induced compaction in fractured and intact chalk cores
(Masteroppgave/UIS-TN-IPT/2013;, Master thesis, 2013-06-17)The effect of pore water chemistry on the mechanical strength of chalk has been thoroughly investigated during the last years. Recent studies have demonstrated precipitation of new minerals that further triggers dissolution ... -
CO2-foaming agent retention in fractured chalk models: Experiments and simulations
(Masteroppgave/UIS-TN-IPT/2011;, Master thesis, 2011)Injection of CO2-gas can improve the oil recovery. In naturally fractured reservoirs such as chalk, injection of CO2-gas can result in early gas breakthrough because the gas can use the fractures as pathways from the ... -
Evolution of porosity and permeability in chalk as an effect of variations in non-carbonate minerals and testing temperature
(Masteroppgave/UIS-TN-IPT/2015;, Master thesis, 2015-06)Pressure decline during oil recovery from chalk reservoirs exhibit increase in effective stress and this in turn leads to reservoir compaction causing seabed subsidence. Although, there is positive impact of compaction on ... -
Evolution of wetting index over time in mixed wet Kansas chalk using triaxial cells
(Masteroppgave/UIS-TN-IPT/2017;, Master thesis, 2017-06)Magnesium chloride effects have been widely studied in short and long-term core flooding experiments through outcrop chalk cores. Three main changes are induced by this reactive brine: ion exchange, dissolution of calcite ... -
How stress and temperature conditions affect rock-fluid chemistry and mechanical deformation
(Journal article; Peer reviewed, 2016-03)We report the results from a series of chalk flow-through-compaction experiments performed at three effective stresses (0.5, 3.5, and 12.3MPa) and two temperatures (92 and 130◦C). The results show that both stress and ... -
Log typing and electro-facies interpretation in Ekofisk field
(Masteroppgave/UIS-TN-IPT/2012;, Master thesis, 2012)Recognition of the dense zones in Ekofisk field is clearly observed from well logging through a specific peak in the neutron-density log. These zones appear to be intercalated in porous clean chalks in the middle part of ... -
Mathematical modeling of water-rock chemistry during water injection and its impact on the composition and porosity of chalk
(Masteroppgave/UIS-TN-IPT/2010;, Master thesis, 2010) -
Mechanical and physical behavior of high-porosity chalks exposed to chemical perturbation
(Journal article; Peer reviewed, 2015-09)Extensive study on the effect of dissolution–precipitation on mechanical behavior of various high-porosity outcrop chalks (Liége, Aalborg, Kansas, Stevns Klint, and Mons) flooded with simplified aqueous chemistry at 130 ... -
The mechanical behavior of chalk under laboratory conditions simulating reservoir operations
(PhD thesis UiS;, Doctoral thesis, 2010-06-08)This work has been carried out with the chalk mechanics research society at the University of Stavanger. The PhD thesis is thus a continuation to the long line of experimental chalk research carried out honoring the ... -
Micro- and nano-analyses of fracture-filling after flooding on-shore chalk with different IOR fluids
(Masteroppgave/UIS-TN-IER/2018;, Master thesis, 2018-06-22)Water injection into the Ekofisk-reservoir was introduced in 1987 to enhance oil recovery (EOR) dissolution and precipitation by exposing chalk to various brines at reservoir conditions, which further increased deformation ... -
Micro- and nano-applications to monitor the rock-fluid interaction in fractured chalk
(Master thesis, 2015-06)The aim of this project is to contribute to the research of improved oil recovery (IOR) through studying the formation of new mineral phases in a fractured Cretaceous onshore chalk core, flooded with synthetic seawater ... -
Permeability evolution of chalk under different stress states
(Masteroppgave/UIS-TN-IPT/2017;, Master thesis, 2017-06-15)This thesis reports the results obtained from triaxial tests on Kansas outcrop chalk flooded with inert NaCl brine. Permeability measurements are conducted at 50ºC under different stress states simulated by five test ... -
Seismic stratigraphy and geomorphology of the chalk group of the central graben, north sea
(Masteroppgave/UIS-TN-IPT/2015;, Master thesis, 2015-06-29)The Ekofisk Field in the Southern part of the North Sea has been producing oil since its discovery in 1969 from naturally fractured chalk of the Late Cretaceous to Early Paleocene ages. This Chalk Group of the Norwegian ... -
“Smart water” as a wettability modifier in chalk: The effect of salinity and ionic composition
(Doctoral thesis; Journal article; Peer reviewed, 2010)Seawater can improve the water wetness of chalk at high temperatures, which improves the oil displacement by spontaneous imbibition of water. It is experimentally verified that the interaction between Ca2+, Mg2+, and SO42− ... -
The impact of temperature and non-carbonate minerals on chalk compaction
(Masteroppgave/UIS-TN-IPT/2015;, Master thesis, 2015-06-15)There has been a considerable research activity concerning the effect of brine chemistry on the mechanical behaviour of chalk since the discovery of the Ekofisk subsidence in the North Sea. Although the research on water ... -
The influence of pore pressure on rock-fluid interaction
(Masteroppgave/UIS-TN-IPT/2009;, Master thesis, 2009)The experimental work in this thesis was performed at the chalk laboratory in University of Stavanger. The main objective is to determine the overall influence of pore pressure on the mechanical strength of chalk in the ... -
Water induced compaction of chalks with varying non-carbonate content : the effect of Mg2+ and pH of the injected brines
(Masteroppgave/UIS-TN-IPT/2012;, Master thesis, 2012)The main objective for this study was to investigate the effect of alkaline brines on chalk, and the importance of non-carbonate content in chalk. This was done by flooding alkaline MgCl2 on Liège chalk – which has ... -
Water weakening of chalk: A mechanistic study
(PhD thesis UiS;11, Doctoral thesis, 2005)Since the detection of the Ekofisk subsidence some 20 years ago, there has been a considerable research activity concerning chalk behaviour in general, and mechanical properties particularly. Due to the importance of water ... -
Water weakening of chalks - comparsion of intact and fractured cores
(Masteroppgave/UIS-TN-IPT/2013;, Master thesis, 2013-06-17)Even though Chemical induced compaction on high porosity chalks has been studied extensively, little attention was given to the impacts of fractures when chalk is exposed to various flooding brines. Due to the nature of ...