B. Hagemann, J. Wegner, L. Ganzer
Clausthal University of Technology, Clausthal-Zellerfeld, Germany
In tight gas formations where the low matrix permeability prevents successful and economic production rates, hydraulic fracturing is required to produce a well at economic rates. As production from the well and its initial fracture declines, re-fracturing treatments are required to accelerate recovery. The orientation of the following hydraulic fracture depends on the actual stress-state of the ...
Application of the Focused Impedance Method (FIM) to Determine the Volume of an Object within a Volume Conductor
M. A. Kadir, S. P. Ahmed, G. D. Al Quaderi, R. Rahman, K. Siddique-e Rabbani
Department of Biomedical Physics & Technology, University of Dhaka, Dhaka, Bangladesh
Department of Physics, Jahangirnagar University, Savar, Dhaka, Bangladesh
Department of Physics, University of Dhaka, Dhaka, Bangladesh
Focused Impedance Method (FIM), a new technique of electrical impedance measurement having high sensitivity in the central region, can sense the change in transfer impedance of an object embedded at a shallow depth within a volume conductor of unchanging background conductivity, using electrodes at the surface. This paper presents a new method for measuring the volume of such an embedded object ...
T. Fong, M. Chui, and D. L. Freyberg
Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, USA
Hydrological processes and components are intrinsically coupled, and thus must often be modeled as an integrated system. Unfortunately, although a few modeling codes are available, integrated hydrological modeling remains a challenge.The objective of this paper is to explore the feasibility of using COMSOL Multiphysics for integrated hydrological modeling; in particular, using the generic ...
J. Acuna, M. Fossa, P. Monzó
KTH Energy Technology, Stockholm, Sweden
Dime, University of Genova, Genova, Italy
Ground-coupled heat pumps (GCHP) are successfully installed since at about 20 years in many countries to fulfill space conditioning requirements in building applications. In most cases the heat pump is connected to a system of vertical ground heat exchangers (as illustrated in Figure 1) where a fluid is circulated inside a system of pipes inserted in a deep borehole drilled in the soil. Drilling ...
Georg-August Universität Göttingen, Göttingen, Germany
Although there are porous media and subsurface flow modes available in a toolbox of COMSOL Multiphysics®, some common requirements in hydrogeological models can not be easily accessed in the graphical user interface. Most crucially, there is no distinction between confined and unconfined situations for permeable layers, so called aquifers. Using the Physics Builder for such distinctions aquifer ...
COMSOL Implementation for Upscaling of Two-Phase Immiscible Flows in Communicating Layered Reservoirs
X. Zhang, A. Shapiro, and E.H. Stenby
Center for Energy Resources Engineering, Technical University of Denmark, Lyngby, Denmark
Waterflooding is widely used in secondary oil recovery. The physics is described by the model of two-phase flow in porous media. The aim of the present work is to implement this model in COMSOL Multiphysics and to simulate the process of waterflooding. It is analyzed in two dimensions. We use layered reservoir in our study. The numerical implementation is validated, comparing with analytical ...
Finite Element Solution of Nonlinear Transient Rock Damage with Application in Geomechanics of Oil and Gas Reservoirs
S. Enayatpour, T. Patzek
The University of Texas at Austin, Austin, TX, USA
The increasing energy demand calls for advances in technology which translate into more accurate and complex simulations of physical problems. Understanding the rock damage is essential to understanding the geomechanics of hydrocarbon reservoirs. The fragile microstructure of some rocks makes it difficult to predict the propagation of fracture in these rocks, therefore a mathematical model is ...
E. Holzbecher, P. Oberdorfer, F. Maier, and Y. Jin
Georg-August Universität Göttingen
Geothermal heat production from deep reservoirs (5000-7000 m) is currently examined, not only in Germany. Our reference set-up consists of two pipes within a single borehole: one for pumping. We examine a design, where a single borehole splits into two legs at a certain depth. The two legs are connected by highly permeable geological, natural or artificial strata in the deep subsurface. The ...
S. Hoyer, U. Exner, M. Voorn, A. Rath
Department of Geodynamics and Sedimentology, University of Vienna, Austria
Museum of Natural History, Vienna, Austria
OMV ESG-D Production Geology, Vienna, Austria
Knowledge on flow behavior in fractured reservoir rocks is of great interest in petroleum engineering as well as for geothermal assets. Due to the big difference of magnitude (fracture aperture: ~?m, lateral extension of reservoirs ~km), modeling of discrete fracture flow is not practicable on the reservoir scale, so a Darcy (or Brinkman) approximation has to be found. The key task is to find ...
A. Nardi, L. M. de Vries, P. Trinchero, A. Enrique Idiart , J. Molinero
Amphos 21, Barcelona, Spain
Phreeqc is a program for simulating chemical reactions and 1D transport processes in aqueous systems. Several couplings between conservative transport codes and PHREEQC already exist. The methodology used here is based on the operator splitting concept: the transport of the aqueous components and the chemical reactions are solved in two different steps. The Java interface uses the COMSOL Java ...