Publications
154 results found
Ott H, Berg S, Oedai S, 2012, Displacement and Mass Transfer of CO<sub>2</sub>/brine in Sandstone, 6TH TRONDHEIM CONFERENCE ON CO2 CAPTURE, TRANSPORT AND STORAGE, Vol: 23, Pages: 512-520, ISSN: 1876-6102
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- Citations: 14
Cense AW, Berg S, Jansen E, et al., 2011, Direct visualization of designer water flooding in model experiments, Pages: 1256-1265
Increasing oil production by injection of designer water - also known as low salinity water - into a reservoir has recently attracted substantial attention from the oil producing community. The phenomenon has been studied by many researchers and low salinity water flooding is currently being applied in the field. On a macroscopic level, the effect can be parameterized as effective wettability modification to a more water-wet state but on a microscopic level, the effect is still not very well understood. Most researchers agree that in sandstone rock, the mechanism is related to clay minerals but most of the experimental evidence is provided on the macroscopic scale (core flooding experiments) or even the field scale. Observations are not fully consistent and the predictability of the effect is limited. In a preceding publication [Petrophysics 2010, 51(5), 314-322] direct experimental evidence was provided for the detachment of oil droplets from a clay substrate upon exposure to low salinity brine. The brine salinity for designer water flooding falls within a narrow window of opportunity: when too high, no additional oil production is observed; when too low, clay swelling and/or deflocculation may result in formation damage in the field. This raises the question whether there is a regime where oil is released with no or only minor formation damage and what the optimum salinity level for this would be. In this follow-up study, experiments are conducted on montmorillonite clay (which is a swelling clay belonging to the group of smectite clays) where the amount of released oil and the degree of formation damage are studied as a function of the salinity level. Starting at very high salinity (26,000 mg/L totally dissolved solids, TDS) no release of oil was observed and the clays remained stable. At very low salinity (2,000 mg/L TDS), up to 30% of the oil was released accompanied by substantial formation damage. There is, however, an intermediate salinity regime between 6,0
Niessner J, Berg S, Hassanizadeh SM, 2011, Comparison of Two-Phase Darcy's Law with a Thermodynamically Consistent Approach, TRANSPORT IN POROUS MEDIA, Vol: 88, Pages: 133-148, ISSN: 0169-3913
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- Citations: 52
Berg S, Oedai S, Landman AJ, et al., 2010, Miscible displacement of oils by carbon disulfide in porous media Experiments and analysis, PHYSICS OF FLUIDS, Vol: 22, ISSN: 1070-6631
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- Citations: 31
Berg S, Cense AW, Jansen E, et al., 2010, Direct Experimental Evidence of Wettability Modification by Low Salinity, PETROPHYSICS, Vol: 51, Pages: 314-322, ISSN: 1529-9074
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- Citations: 104
Berg S, Mesters C, Wang D, 2009, SYSTEMS AND METHODS FOR PRODUCING OIL AND/OR GAS, WO2009067420
A system for producing oil and/or gas from an underground formation comprising a first array of wells dispersed above the formation; a second array of wells dispersed above the formation; wherein the first array of wells comprises a mechanism to inject a miscible enhanced oil recovery formulation into the formation while the second array of wells comprises a mechanism to produce oil and/or gas from the formation for a first time period; and a means to convert at least a portion of the miscible enhanced oil recovery formulation within the formation into another compound during a second time period.
Berg S, 2009, SYSTEMS AND METHODS FOR PRODUCING OIL AND/OR GAS, WO/2009/058846
A system for producing oil and/or gas from an underground formation (200) comprising a first array of wells (202) dispersed above the formation; a second array of wells (204) dispersed above the formation; wherein the first array of wells comprises a mechanism to inject a miscible enhanced oil recovery formulation into the formation while the second array of wells comprises a mechanism to produce oil and/or gas from the formation for a first time period; and wherein the second array of wells comprises a mechanism to inject a remediation agent into the formation while the first array of wells comprises a mechanism to produce the miscible enhanced oil recovery formulation from the formation for a second time period.
Berg S, 2009, Marangoni-driven spreading along liquid-liquid interfaces, PHYSICS OF FLUIDS, Vol: 21, ISSN: 1070-6631
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- Citations: 70
Berg S, Cense AW, Hofman JP, et al., 2008, Two-phase flow in porous media with slip boundary condition, TRANSPORT IN POROUS MEDIA, Vol: 74, Pages: 275-292, ISSN: 0169-3913
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- Citations: 44
Berg S, Adelizzi EA, Troian SM, 2005, Experimental study of entrainment and drainage flows in microscale soap films, LANGMUIR, Vol: 21, Pages: 3867-3876, ISSN: 0743-7463
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- Citations: 43
Berg S, Adelizzi EA, Troian SM, 2004, Images of the Floating World: Drainage Patterns in Thinning Soap Films, Physics of Fluids, Vol: 16, Pages: S6-S6, ISSN: 1070-6631
Berg S, Johannsmann D, 2003, High speed microtribology with quartz crystal resonators, PHYSICAL REVIEW LETTERS, Vol: 91, ISSN: 0031-9007
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- Citations: 42
Berg S, Johannsmann D, 2003, Nonlinearities in contact mechanics experiments with quartz crystal resonators, SURFACE SCIENCE, Vol: 541, Pages: 225-233, ISSN: 0039-6028
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- Citations: 3
Berg S, Ruths M, Johannsmann D, 2003, Quartz crystal resonators with atomically smooth surfaces for use in contact mechanics, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 74, Pages: 3845-3852, ISSN: 0034-6748
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- Citations: 10
Bund A, Baba A, Berg S, et al., 2003, Combining surface plasmon resonance and quartz crystal microbalance for the in situ investigation of the electropolymerization and doping/dedoping of poly(pyrrole), JOURNAL OF PHYSICAL CHEMISTRY B, Vol: 107, Pages: 6743-6747, ISSN: 1520-6106
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- Citations: 40
Berg S, Johannsmann D, Ruths M, 2003, Frequency response of quartz crystal shear-resonator during an adhesive, elastic contact in a surface forces apparatus (vol 92, pg 6905, 2002), JOURNAL OF APPLIED PHYSICS, Vol: 93, Pages: 3682-3682, ISSN: 0021-8979
Berg S, Prellberg T, Johannsmann D, 2003, Nonlinear contact mechanics based on ring-down experiments with quartz crystal resonators, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 74, Pages: 118-126, ISSN: 0034-6748
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- Citations: 18
Berg S, Johannsmann D, 2003, High frequency contact mechanics based on quartz crystal resonators: Application to polymer surfaces, POLYMER/METAL INTERFACES AND DEFECT MEDIATED PHENOMENA IN ORDERED POLYMERS, Vol: 734, Pages: 41-48, ISSN: 0272-9172
Berg S, Johannsmann D, Ruths M, 2002, Frequency response of quartz crystal shear-resonator during an adhesive, elastic contact in a surface forces apparatus, JOURNAL OF APPLIED PHYSICS, Vol: 92, Pages: 6905-6910, ISSN: 0021-8979
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- Citations: 13
Schön JH, Meng H, Bao Z, 2002, Ambipolar pentacene field-effect transistors and inverters (Retraction of vol 287, pg 1022, 2000), SCIENCE, Vol: 298, Pages: 961-961, ISSN: 0036-8075
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- Citations: 12
Schön JH, Berg S, Kloc C, et al., 2002, Erratum: Ambipolar pentacene field-effect transistors and inverters (Science (2000) 287 (1022)), Science, Vol: 298, ISSN: 0036-8075
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- Citations: 2
Schön JH, Meng H, Bao Z, 2002, Field-effect modulation of the conductance of single molecules (Retraction of vol 294, pg 2138, 2001), SCIENCE, Vol: 298, Pages: 961-961, ISSN: 0036-8075
Bao Z, Batlogg B, Berg S, et al., 2002, Retraction., Science, Vol: 298
Berg S, Ruths M, Johannsmann D, 2002, High-frequency measurements of interfacial friction using quartz crystal resonators integrated into a surface forces apparatus, PHYSICAL REVIEW E, Vol: 65, ISSN: 2470-0045
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- Citations: 19
Schoen JH, Kloc C, Berg S, et al., 2001, Two-dimensional band-like charge transport in α-sexithiophene, ORGANIC ELECTRONICS, Vol: 2, Pages: 135-142, ISSN: 1566-1199
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- Citations: 4
Schön JH, Berg S, Kloc C, et al., 2001, Persistent photoconductivity in single crystals of the high temperature polymorph of α-sexithiophene, SYNTHETIC METALS, Vol: 123, Pages: 125-128, ISSN: 0379-6779
Siegrist T, Kloc C, Schön JH, et al., 2001, Enhanced physical properties in a pentacene polymorph, Angewandte Chemie - International Edition, Vol: 40, Pages: 1732-1736, ISSN: 1433-7851
A low temperature mobility up to 10000 cm2 V-1S-1 at 1.7 K was observed for a new polymorphic form of pentacene (C22H14, see picture). Opical measurements show a band gap of the order of 2 eV, and transport measurements revealed a mobility above 3 cm2 V-1S-1 at room temperature.
Siegrist T, Kloc C, Schön JH, et al., 2001, Enhanced Physical Properties in a Pentacene Polymorph, Angewandte Chemie, Vol: 113, Pages: 1782-1786, ISSN: 0044-8249
Berg S, Johannsmann D, 2001, Laterally coupled quartz resonators, ANALYTICAL CHEMISTRY, Vol: 73, Pages: 1140-1145, ISSN: 0003-2700
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- Citations: 18
Siegrist T, Kloc C, Schön JH, et al., 2001, Enhanced physical properties in a pentacene polymorph, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 40, Pages: 1732-1736, ISSN: 1433-7851
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- Citations: 194
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