Searched for: author:"Fokker, P.A."
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Fokker, P.A. (author), Borello, E.S. (author), Viberti, D. (author), Verga, F. (author), van Wees, J.D. (author)
Seasonal storage of heat in shallow aquifers for increasing the efficiency of geothermal energy systems requires a proper monitoring strategy. We expanded our earlier work on harmonic pulse testing (HPT) to incorporate the effect of a temperature front moving into the reservoir due to injection of hot (or cold) water. Our analytical solutions...
article 2021
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Singh, A. (author), Fokker, P.A. (author)
This work is an extension of the time-resolved poro-elasto-plastic MohrCoulomb model by Fokker et al to include a more realistic constitutive model. Experiments on Slochteren sandstone revealed that the inelastic deformation contributes significantly in compressive deformation almost in all stages of loading and instigated the development of a...
article 2021
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Wassing, B.B.T. (author), Gan, Q. (author), Candela, T. (author), Fokker, P.A. (author)
Enhanced Geothermal Systems (EGS) involve hydraulic stimulation of the permeability of deep low-permeable rock formations. This causes the reactivation and opening of pre-existing natural fracture networks and the formation of new fractures. During hydraulic stimulation, injection pressures at the bottom of the injection well can reach...
article 2021
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Fokker, P.A. (author), Erkens, G. (author)
The surface of the earth is constantly in motion. The lowering of the earth surface over time is called land subsidence. Land subsidence is a local phenomenon on a global scale and is often problematic in the context of human societies. Much of the problematic land subsidence is humaninduced, with major causes being the extraction or mining of...
article 2020
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Fokker, P.A. (author), Singh, A. (author), Wassing, B.B.T. (author)
Wellbore stability problems and stimulation operations call for models helping in understanding the subsurface behaviour and optimizing engineering performance. We present a fast, iteratively coupled model for the flow and mechanical behaviour that employs a time-sequential approach. Updates of pore pressure are calculated in a timestepping...
article 2020
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Nwanwe, C.C. (author), Fokker, P.A. (author)
Reservoir simulations are performed with fine grid geological models as primary input into the reservoir simulators. These fine grid geological models contain ten million to one hundred million cells while current serial reservoir simulators can only handle one hundred thousand to one million cells. This disparity in scales prohibits direct...
article 2020
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van Daalen, T.M. (author), Fokker, P.A. (author), Bogaard, P.J.F. (author), van der Meulen, M.J. (author)
Geological surveys traditionally assess past and present processes in the subsurface, focusing mainly on exploration and extraction of natural resources. Applications like these determined how geological surveys designed and operated their information services. In recent years, information needs are rapidly evolving in conjunction with emerging...
conference paper 2020
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Candela, T.G.G. (author), Koster, K. (author), Stafleu, J. (author), Visser, W. (author), Fokker, P.A. (author)
The Netherlands is subject to anthropogenically induced deep-source and shallow subsidence. Deep sources are related to the extraction of hydrocarbons or salt mining activities, whereas shallow subsidence comprise compaction, shrinkage and oxidation of clay and peat under progressive lowering groundwater levels. At TNO – Geological Survey of the...
conference paper 2020
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Fokker, P.A. (author)
The Netherlands is subsiding faster than the sea level is rising. In large parts of the Netherlands, human intervention is causing increased subsidence, in part because of a reduction in groundwater levels. The Geological Survey of the Netherlands (GDN), part of TNO, investigates all aspects of subsidence in collaboration with other institutes....
other 2020
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Stouthamer, E. (author), Erkens, G. (author), Cohen, K. (author), Hegger, D. (author), Driessen, P. (author), Weikard, H.P. (author), Hefting, M. (author), Hanssen, R. (author), Fokker, P.A. (author), van den Akker, J. (author), Groothuijse, F. (author), van Rijswick, M. (author)
t. In the Netherlands land subsidence is a continuously ongoing process. Consequently, an increasing number of people and economic assets are exposed to subsidence, damage costs are soaring, and flood risk and greenhouse gas emissions are increasing. In some areas tipping points have already been reached, where current land-use can no longer be...
conference paper 2020
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Bekesi, E. (author), Struijk, M. (author), Bonte, D. (author), Veldkamp, J.G. (author), Limburger, J. (author), Fokker, P.A. (author), Vrijlandt, M.A.W. (author), van Wees, J.D. (author)
The subsurface temperature is one of the most crucial parameters for the development of geothermal energy. Physics-based temperature models calibrated with temperature data are especially relevant for deep geothermal exploration. We present an updated high-resolution 3D thermal model of the onshore Netherlands. We constructed the model in 7...
article 2020
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Kroon, I.C. (author), Fokker, P.A. (author), Breunese, J.N. (author)
The proper management of subsidence hazards requires a procedure to formulate thresholds and measurement & control loops. Such a formulation should be adequate in terms of technical hazard and hazard perception, unambiguous, in plain language and preferably complying with national or international standards. The technical nature of subsidence...
conference paper 2020
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Borello, E.S. (author), Fokker, P.A. (author), Viberti, D. (author), Verga, F. (author), Hofmann, H. (author), Meier, P. (author), Min, K.B. (author), Yoon, K. (author), Zimmermann, G. (author)
Harmonic Pulse Testing (HPT) has been developed as a type of well testing applicable during ongoing field operations because a pulsed signal is superimposed on background pressure trend. Its purpose is to determine well and formation parameters such as wellbore storage, skin, permeability, and boundaries within the investigated volume. Compared...
article 2019
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Fokker, P.A. (author), Gunnink, J.L. (author), Koster, K. (author), de Lange, G. (author)
The natural surface area of many coastal and delta plains has been increased by land reclamation in response to growing populations. These reclaimed lands are often experiencing subsidence. The reclaimed South Flevopolder in the coastal plain of the Netherlands has experienced severe subsidence after its reclamation in 1968. The subsidence is...
article 2019
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Candela, T.G.G. (author), Osinga, S. (author), Ampuero, J.P. (author), Wassing, B.B.T. (author), Pluymaekers, M.P.D. (author), Fokker, P.A. (author), Wees, J.D.A.M. (author), de Waal, H.A. (author), Muntendam-Bos, A.G. (author)
We implement a Coulomb rate‐and‐state approach to explore the nonlinear relation between stressing rate and seismicity rate in the Groningen gas field. Coulomb stress rates are calculated, taking into account the 3‐D structural complexity of the field and including the poroelastic effect of the differential compaction due to fault offsets. The...
article 2019
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van Wees, J.D. (author), Osinga, S. (author), van Thienen-Visser, K. (author), Fokker, P.A. (author)
The Groningen gas field in the Netherlands experienced an immediate reduction in seismic events in the year following a massive cut in production. This reduction is inconsistent with existingmodels of seismicity predictions adopting compaction strains as proxy, since reservoir creep would then result in a more gradual reduction of seismic events...
article 2018
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Liu, J. (author), Fokker, P.A. (author), Peach, C.J. (author), Spiers, C.J. (author)
This paper investigates whether or not applied stress reduces swelling of coal upon water adsorption, and, if so, what mechanisms are responsible. With this aim, thermodynamic models were developed addressing the effect of a general applied stress on water adsorption capacity and associated swelling behaviour of coal matrix material, assuming...
article 2018
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Fokker, P.A. (author), van Leijen, F.J. (author), Orlic, B. (author), van der Marel, H. (author), Hanssen, R.F. (author)
Ground surface dynamics is one of the processes influencing the future of the Wadden Sea area. Vertical land movement, both subsidence and heave, is a direct contributor to changes in the relative sea level. It is defined as the change of height of the Earth’s surface with respect to a vertical datum. In the Netherlands, the Normaal Amsterdams...
article 2018
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Fokker, P.A. (author), Salina Borello, E. (author), Verga, F. (author), Viberti, D. (author)
Harmonic testing was developed as a form of well testing that can be applied during ongoing production or injection operations, as a pulsed signal is superimposed on the background pressure trend. Thus no interruption of well and reservoir production is needed before and during the test. If the pulsed pressure and rate signal analysis is...
article 2018
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Fokker, P.A. (author), Osinga, S. (author)
Fast models to estimate subsidence resulting from subsurface extraction processes usually employ a nucleus-of-strain solution based on a center of compression. The solution for such a strain nucleus is then employed as an influence function. This approach is based on the superposition principle that applies for linear elasticity of the...
conference paper 2018
Searched for: author:"Fokker, P.A."
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