Imperial College London

Dr. Samuel Krevor

Faculty of EngineeringDepartment of Earth Science & Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 2701s.krevor

 
 
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Location

 

1.43Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

62 results found

Bui M, Adjiman CS, Bardow A, Anthony EJ, Boston A, Brown S, Fennell PS, Fuss S, Galindo A, Hackett LA, Hallett JP, Herzog HJ, Jackson G, Kemper J, Krevor S, Maitland GC, Matuszewski M, Metcalfe IS, Petit C, Puxty G, Reimer J, Reiner DM, Rubin ES, Scott SA, Shah N, Smit B, Trusler JPM, Webley P, Wilcox J, Mac Dowell Net al., 2018, Carbon capture and storage (CCS): the way forward, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 11, Pages: 1062-1176, ISSN: 1754-5692

JOURNAL ARTICLE

Jackson SJ, Agada S, Reynolds CA, Krevor Set al., 2018, Characterizing Drainage Multiphase Flow in Heterogeneous Sandstones, WATER RESOURCES RESEARCH, Vol: 54, Pages: 3139-3161, ISSN: 0043-1397

JOURNAL ARTICLE

Kolster C, Agada S, Mac Dowell N, Krevor Set al., 2018, The impact of time-varying CO2 injection rate on large scale storage in the UK Bunter Sandstone, INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, Vol: 68, Pages: 77-85, ISSN: 1750-5836

JOURNAL ARTICLE

Reynolds CA, Blunt MJ, Krevor S, 2018, Multiphase Flow Characteristics of Heterogeneous Rocks From CO2 Storage Reservoirs in the United Kingdom, WATER RESOURCES RESEARCH, Vol: 54, Pages: 729-745, ISSN: 0043-1397

JOURNAL ARTICLE

Agada S, Jackson S, Kolster C, Mac Dowell N, Williams G, Vosper H, Williams J, Krevor Set al., 2017, The impact of energy systems demands on pressure limited CO2 storage in the Bunter Sandstone of the UK Southern North Sea, INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, Vol: 65, Pages: 128-136, ISSN: 1750-5836

JOURNAL ARTICLE

Agada S, Kolster C, Williams G, Vosper H, MacDowell N, Krevor Set al., 2017, Sensitivity analysis of the dynamic CO2 storage capacity estimate for the Bunter Sandstone of the UK Southern North Sea, 13th International Conference on Greenhouse Gas Control Technologies (GHGT), Publisher: ELSEVIER SCIENCE BV, Pages: 4564-4570, ISSN: 1876-6102

CONFERENCE PAPER

Al-Menhali AS, Krevor S, 2017, Pore-scale Analysis of In Situ Contact Angle Measurements in Mixed-wet Rocks: Applications to Carbon Utilization in Oil Fields, 13th International Conference on Greenhouse Gas Control Technologies (GHGT), Publisher: ELSEVIER SCIENCE BV, Pages: 6919-6927, ISSN: 1876-6102

CONFERENCE PAPER

Alshawaf MH, Krevor S, Muggeridge A, 2017, Analysis of viscous crossflow in polymer flooding

Polymer flooding improves oil recovery by improving flood front conformance compared with waterflooding as well as, in some cases, extracting more oil from lower permeability zones in the reservoir by viscous cross-flow. However viscous cross-flow of water from the low permeability zone may also adversely affect the polymer flood by causing the polymer slug to be diluted and possibly to lose its integrity. The extent to which viscous cross-flow improves or reduces recovery depends upon the permeability contrast between the low and high permeability zones, the viscosity ratios of the fluids (oil, water and polymer solution) and the geometry of the layers. This paper uses inspectional analysis to derive the minimum set of 6 dimensionless numbers that can be used to characterise a polymer flood in a two layered model. A series of finely gridded numerical simulations are then performed to determine the contribution of viscous crossflow to oil recovery from secondary and tertiary polymer flooding in this system. We show that viscous cross-flow will only make a positive impact on oil recovery from secondary polymer flooding when the viscosity ratio values of oil to polymer solution is less than 1 and permeability ratio between the layers is less than 50. Furthermore, we show that there is an inverse relationship between the permeability ratio between layers and the amount of degradation the polymer slug experiences due to viscous crossflow in the high permeability layer. As the permeability contrast between layers increases, the slug degradation decreases. Also, the results show that the desired positive impact from viscous crossflow is higher in secondary polymer foods when compared to tertiary polymer floods. Finally, the results can be used to make initial estimates of the contribution of both viscous cross-flow and mobility control in polymer flooding applications without the need to perform extensive and time consuming numerical simulations.

CONFERENCE PAPER

Boon M, Bijeljic B, Krevor S, 2017, Observations of the impact of rock heterogeneity on solute spreading and mixing, WATER RESOURCES RESEARCH, Vol: 53, Pages: 4624-4642, ISSN: 0043-1397

JOURNAL ARTICLE

Budinis S, Mac Dowell N, Krevor S, Dixon T, Kemper J, Hawkes Aet al., 2017, Can carbon capture and storage unlock `unburnable carbon'?, 13th International Conference on Greenhouse Gas Control Technologies (GHGT), Publisher: ELSEVIER SCIENCE BV, Pages: 7504-7515, ISSN: 1876-6102

CONFERENCE PAPER

Kolster C, Masnadi MS, Krevor S, Dowell NM, Brandt ARet al., 2017, CO2 enhanced oil recovery: a catalyst for gigatonne-scale carbon capture and storage deployment?, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 10, Pages: 2594-2608, ISSN: 1754-5692

JOURNAL ARTICLE

Kolster C, Mechleri E, Krevor S, Mac Dowell Net al., 2017, The role of CO<inf>2</inf>purification and transport networks in carbon capture and storage cost reduction, International Journal of Greenhouse Gas Control, Vol: 58, Pages: 127-141, ISSN: 1750-5836

© 2017 Elsevier Ltd A number of Carbon Capture and Storage projects (CCS) are under way around the world, but the technology's high capital and operational costs act as a disincentive to large-scale deployment. In the case of both oxy-combustion and post-combustion CO2capture, the CO2compression and purification units (CO2CPU) are vital, but costly, process elements needed to bring the raw CO2product to a quality that is adequate for transport and storage. Four variants of the CO2CPU were modelled in Aspen HYSYS each of which provide different CO2product purities at different capital and operating costs. For each unit, a price of CO2is calculated by assuming that it is an independent entity in which to invest and the internal rate of return (IRR) must be greater or equal to the minimum rate of return on investment. In this study, we test the hypothesis that, owing to the fact that CO2will likely be transported in multi-source networks, not all CO2streams will need to be of high purity, and that it may be possible to combine several sources of varying purity to obtain an end-product that is suitable for storage. We find that, when considering study generated costs for an example network in the UK, optimally combining these different sources into one multi-source transport network subject to a minimum CO2purity of 96% can reduce the price of captured CO2by 17%.

JOURNAL ARTICLE

Kolster C, Mechleri E, Krevor S, Mac Dowell Net al., 2017, The role of CO2 purification and transport networks in carbon capture and storage cost reduction, INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, Vol: 58, Pages: 127-141, ISSN: 1750-5836

JOURNAL ARTICLE

Krevor S, Boon M, Lai P, Franchini S, Niu B, Al-Menhali A, Reynolds Cet al., 2017, Characterising pore scale mineral heterogeneity and solute transport to model reactive transport for CO2 storage, 253rd National Meeting of the American-Chemical-Society (ACS) on Advanced Materials, Technologies, Systems, and Processes, Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Liyanage R, Crawshaw J, Krevor S, Pini Ret al., 2017, Multidimensional Imaging of Density Driven Convection in a Porous Medium, 13th International Conference on Greenhouse Gas Control Technologies (GHGT), Publisher: ELSEVIER SCIENCE BV, Pages: 4981-4985, ISSN: 1876-6102

CONFERENCE PAPER

Reynolds C, Krevor S, 2017, Capillary limited flow behavior of CO2 in target reservoirs in the UK, 13th International Conference on Greenhouse Gas Control Technologies (GHGT), Publisher: ELSEVIER SCIENCE BV, Pages: 4518-4523, ISSN: 1876-6102

CONFERENCE PAPER

Reynolds CA, Menke H, Andrew M, Blunt MJ, Krevor Set al., 2017, Dynamic fluid connectivity during steady-state multiphase flow in a sandstone, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 114, Pages: 8187-8192, ISSN: 0027-8424

JOURNAL ARTICLE

Agada S, Kolster C, Williams G, Krevor Set al., 2016, Modelling basin-scale CO2 storage in the Bunter Sandstone of the UK Southern North Sea

In this paper, a reservoir simulation model of the large-scale Bunter Sandstone in the UK Southern North Sea is used to evaluate the dynamics of regional CO2 plume transport and storage. We have tested the sensitivity of injection capacity to a range of target CO2 injection rates and the number of sites at which injection is deployed. In addition to geology, the model is constrained by local bottom-hole-pressure (BHP) limits and site spacing. Large-scale pressure buildup limitations and the impact of brine production on storage capacity are also evaluated. Furthermore, monitoring of the CO2 plume at multiple injection sites indicates important subsurface controls on plume migration in the context of short-term (approx. 50 years) and long-term CO2 storage (approx. 1000 years).

CONFERENCE PAPER

Al-Menhali A, Krevor S, 2016, The impact of crude oil induced wettability alteration on remaining saturations of CO<inf>2</inf>in carbonates reservoirs: A core flood method

Copyright 2016, Society of Petroleum Engineers. Oil is an essential commodity in modern economies but the magnitude of carbon emissions associated with its consumption is significantly increasing the challenges of climate change mitigations. Carbon storage is well recognized as an important technology for CO2emissions reduction on industrial scales. Observations and modeling have shown that residual trapping of CO2through capillary forces within the pore space of saline aquifers, characterized as water-wet, is one of the most significant mechanisms for storage security and is also a factor determining the ultimate extent of CO2migration within the reservoir. In contrast, most of the major CO2storage projects in operation and under construction are in depleting oil reservoirs utilizing CO2for enhanced oil recovery (EOR). Carbon utilization and storage has a significant energy and economic benefits and is considered as an important component in achieving the widespread commercial deployment of carbon storage technology. However, there are no observations characterizing the extent of capillary trapping of CO2in mixed-wet carbonate systems, a characteristic of most conventional oil reservoirs in the world. In this work, residual trapping of supercritical CO2is measured in water-wet and mixed-wet carbonate systems on the same rock sample before and after wetting alteration with crude oil. In particular, CO2trapping was characterized before and after wetting alteration so that the impact of the wetting state of the rock is observed directly. A reservoir condition core-flooding laboratory was used to make the measurements. The setup included high precision pumps, temperature control, stir reactor, the ability to recirculate fluids for weeks at a time and an X-ray computed tomography (CT) scanner. The wetted parts of the flow-loop were made of anti-corrosive material that can handle co-circulation of CO2and brine at reservoir conditions. The measurements were made while mai

CONFERENCE PAPER

Al-Menhali A, Krevor S, 2016, The impact of crude oil induced wettability alteration on remaining saturations of CO<inf>2</inf>in carbonates reservoirs: A core flood method

Oil is an essential commodity in modern economies but the magnitude of carbon emissions associated with its consumption is significantly increasing the challenges of climate change mitigations. Carbon storage is well recognized as an important technology for CO2emissions reduction on industrial scales. Observations and modeling have shown that residual trapping of CO2through capillary forces within the pore space of saline aquifers, characterized as water-wet, is one of the most significant mechanisms for storage security and is also a factor determining the ultimate extent of CO2migration within the reservoir. In contrast, most of the major CO2storage projects in operation and under construction are in depleting oil reservoirs utilizing CO2for enhanced oil recovery (EOR). Carbon utilization and storage has a significant energy and economic benefits and is considered as an important component in achieving the widespread commercial deployment of carbon storage technology. However, there are no observations characterizing the extent of capillary trapping of CO2in mixed-wet carbonate systems, a characteristic of most conventional oil reservoirs in the world. In this work, residual trapping of supercritical CO2is measured in water-wet and mixed-wet carbonate systems on the same rock sample before and after wetting alteration with crude oil. In particular, CO2trapping was characterized before and after wetting alteration so that the impact of the wetting state of the rock is observed directly. A reservoir condition core-flooding laboratory was used to make the measurements. The setup included high precision pumps, temperature control, stir reactor, the ability to recirculate fluids for weeks at a time and an X-ray computed tomography (CT) scanner. The wetted parts of the flow-loop were made of anti-corrosive material that can handle co-circulation of CO2and brine at reservoir conditions. The measurements were made while maintaining chemical equilibrium between the fluids

CONFERENCE PAPER

Al-Menhali AS, Krevor S, 2016, Capillary Trapping of CO2 in Oil Reservoirs: Observations in a Mixed Wet Carbonate Rock, ENVIRONMENTAL SCIENCE & TECHNOLOGY, Vol: 50, Pages: 2727-2734, ISSN: 0013-936X

JOURNAL ARTICLE

Al-Menhali AS, Menke HP, Blunt MJ, Krevor SCet al., 2016, Pore Scale Observations of Trapped CO2 in Mixed-Wet Carbonate Rock: Applications to Storage in Oil Fields, ENVIRONMENTAL SCIENCE & TECHNOLOGY, Vol: 50, Pages: 10282-10290, ISSN: 0013-936X

JOURNAL ARTICLE

Boon M, Bijeljic B, Niu B, Krevor Set al., 2016, Observations of 3-D transverse dispersion and dilution in natural consolidated rock by X-ray tomography, ADVANCES IN WATER RESOURCES, Vol: 96, Pages: 266-281, ISSN: 0309-1708

JOURNAL ARTICLE

Budinis S, Krevor S, Mac Dowell N, Brandon N, Hawkes Aet al., 2016, Can technology unlock unburnable carbon?

In 2015, the Conference Of the Parties in Paris (COP21) reached a universal agreement on climate change with the aim of limiting global warming to below 2 °C. In order to stay below 2 °C, the total amount of carbon dioxide (CO2) released, or ‘carbon budget’ must be less than 1,000 gigatonnes (Gt) of CO2. At the current emission rate, this budget will be eroded within the next thirty years. Meeting this target on a global scale is challenging and will require prompt and effective climate change mitigation action.The concept of ‘unburnable carbon’ emerged in 2011, and stems from theobservation that if all known fossil fuel reserves are extracted and converted to CO2 (unabated), it would exceed the carbon budget and have a very significant effect on the climate. Therefore, if global warming is to be limited to the COP21 target, some of the known fossil fuel reserves should remain unburnt.Several recent reports have highlighted the scale of the challenge, drawing on scenarios of climate change mitigation and their implications for the projected consumption of fossil fuels. Carbon capture and storage (CCS) is a critical and available mitigation opportunity that is often overlooked. The positive contribution of CCS technology to timely and cost-effective decarbonisation of the energy system is widely recognised. However, while some studies have considered the role of CCS in enabling access to more fossil fuels, no detailed analysis on this issue has been undertaken.This White Paper presents a critical review focusing on the technologies that can be applied to enable access to, or ‘unlock’, fossil fuel reserves in a way that will meet climate targets and mitigate climate change.The paper includes an introduction to the key issues of carbon budgets and fossil fuel reserves, a detailed analysis of the current status of CCS technology, as well as a synthesis of a multi-model comparison study on global climate change mitigation strat

REPORT

Djabbarov S, Jones ADW, Krevor S, Muggeridge AHet al., 2016, Experimental and numerical studies of first contact miscible injection in a quarter five spot pattern

Copyright 2016, Society of Petroleum Engineers. We quantify the impact of mobility, simple heterogeneities and grid orientation error on the performance of first contact miscible gas flooding in a quarter five spot configuration by comparing the outputs from experimental and numerical models. The aim is to quantify the errors that may arise during simulation and to identify a workflow for minimizing these when conducting field scale fingering studies. A commercial reservoir simulator was validated by comparing its predictions with the results obtained from physical experiments. An uncorrelated, random permeability distribution was used to trigger fingering in the simulations. The physical experiments were carried out using a Hele-Shaw cell (40x40cm) designed and constructed for this study. The impact of a square low permeability inclusion (20x20cm) on flow was investigated by varying its permeability, location and orientation. For lower mobility ratios (M=2 to M=10) the commercial numerical simulator was able to reproduce the experimental observations within the uncertainty range of the permeability distribution used to trigger the fingers, provided a nine-point scheme was used for the pressure solution. At higher mobility ratios (M=20 to M=100) the grid orientation effect meant that the simulator overestimated the areal sweep even when a nine-point scheme was used. The introduction of a square, low permeability inclusion near the injection well reduced the discrepancy between experimental and numerical results, bringing it back within uncertainty limits in some of the cases. This was mainly because the real flow was then forced to move parallel to the edges of the Hele-Shaw cell and thus parallel to the simulation grid. Breakthrough times were well predicted by the numerical simulator at all mobility ratios.

CONFERENCE PAPER

Krevor S, Reynolds C, Al-Menhali A, Niu Bet al., 2016, The Impact of Reservoir Conditions and Rock Heterogeneity on CO2-Brine Multiphase Flow In Permeable Sandstone, PETROPHYSICS, Vol: 57, Pages: 12-18, ISSN: 1529-9074

JOURNAL ARTICLE

Li X, Yi T, Giddins M, Krevor S, Aderemi Set al., 2016, A novel approach for waterflood management optimisation using streamline technology

This paper presents a new streamline-based workflow to cover the two main aspects of waterflood management optimisation: infill drilling well location identification and injection rate allocation. Streamline properties are used in every step of the evaluation and decision-making process in the workflow. A novel ranking scheme, weighted by streamline 'remaining mobile oil in pattern', is developed in this study. The well ranking criteria are not only based on the properties of individual well completion cells as in a traditional quality map, but also account for connectivity between injector/producer pairs. In such a way, candidate producers at high-quality map locations, but with poor connectivity or limited swept area, can be screened out. The other main component of the workflow is to perform dynamic pattern injection reallocation in response to the changed well pattern resulting from newly introduced producers. A unique insight for utilization of a multi-zone waterflood for a vertically heterogeneous field is also provided. 2D and 3D heterogeneous models were used to develop and validate the workflow for its general implementation on real field models. The final oil recovery and net present value (NPV) analysis show that the oil recovery can be increased significantly compared to traditional optimisation methods.

CONFERENCE PAPER

Oostrom M, White MD, Porse SL, Krevor SCM, Mathias SAet al., 2016, Comparison of relative permeability-saturation-capillary pressure models for simulation of reservoir CO2 injection, INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, Vol: 45, Pages: 70-85, ISSN: 1750-5836

JOURNAL ARTICLE

Porter RTJ, Mahgerefteh H, Brown S, Martynov S, Collard A, Woolley RM, Fairweather M, Falle SAEG, Wareing CJ, Nikolaidis IK, Boulougouris GC, Peristeras LD, Tsangaris DM, Economou IG, Salvador C, Zanganeh K, Wigston A, Najafali JN, Shafeen A, Beigzadeh A, Farret R, Gombert P, Hebrard J, Proust C, Ceroni A, Flauw Y, Zhang Y, Chen S, Yu J, Talemi RH, Bensabat J, Wolf JL, Rebscher D, Niemi A, Jung B, Mac Dowell N, Shah N, Kolster C, Mechleri E, Krevor Set al., 2016, Techno-economic assessment of CO2 quality effect on its storage and transport: CO(2)QUEST An overview of aims, objectives and main findings, INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, Vol: 54, Pages: 662-681, ISSN: 1750-5836

JOURNAL ARTICLE

Al-Menhali A, Niu B, Krevor S, 2015, Capillarity and wetting of carbon dioxide and brine during drainage in Berea sandstone at reservoir conditions, Water Resources Research, Vol: 51, Pages: 7895-7914, ISSN: 0043-1397

The wettability of CO2-brine-rock systems will have a major impact on the management of carbon sequestration in subsurface geological formations. Recent contact angle measurement studies have reported sensitivity in wetting behaviour of this system to pressure, temperature and brine salinity. We report observations of the impact of reservoir conditions on the capillary pressure characteristic curve and and relative permeability of a single Berea sandstone during drainage - CO2 displacing brine - through effects on the wetting state. Eight reservoir condition drainage capillary pressure characteristic curves were measured using CO2 and brine in a single fired Berea sandstone at pressures (5 to 20 MPa), temperatures (25 to 50°C) and ionic strengths (0 to 5 mol kg−1 NaCl). A ninth measurement using a N2-water system provided a benchmark for capillarity with a strongly water wet system. The capillary pressure curves from each of the tests were found to be similar to the N2-water curve when scaled by the interfacial tension. Reservoir conditions were not found to have a significant impact on the capillary strength of the CO2-brine system during drainage through a variation in the wetting state. Two steady-state relative permeability measurements with CO2 and brine and one with N2 and brine similarly show little variation between conditions, consistent with the observation that the CO2-brine-sandstone system is water wetting and multiphase flow properties invariant across a wide range of reservoir conditions.

JOURNAL ARTICLE

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