ABSTRACT Simultaneous determination of relative permeability and capillary pressure curves by inc... more ABSTRACT Simultaneous determination of relative permeability and capillary pressure curves by including more than one set of experimental data in the interpretation process is presented. A numerical simulator is introduced for history matching purposes to avoid the ...
There are at least two key aspects of simulating mu lti-phase flow experiments. One is the actual... more There are at least two key aspects of simulating mu lti-phase flow experiments. One is the actual estimation of multiphase flow properties fro m measured data, and the other is the representation of the unknown functions for relativ e permeability and capillary pressure. It is essential that the representation of these funct ions have sufficient degrees of freedom to model
The authors describe and demonstrate a method for the determination of three-phase relative perme... more The authors describe and demonstrate a method for the determination of three-phase relative permeability functions at reservoir conditions. Two- and three-phase displacement experiments are conducted on a low-permeability chalk sample, and estimates of the three-phase relative permeability and capillary pressure functions are obtained. The authors also calculate three-phase relative permeabilities with the Stone predictive model, and they evaluate them by
There are many aspects of accessing multi-phase flow performance within oil exploitation. One is ... more There are many aspects of accessing multi-phase flow performance within oil exploitation. One is the actual determination of multiphase flow properties from measured data, and another is the representation of the unknown functions for relative permeability and capillary pressure. It is essential that these functions have sufficient degrees of freedom to model the measured data whilst remaining straightforward and easy to communicate. We propose a new analytical correlation as a possible replacement for currently adopted capillary pressure functions. As capillary pressure by definition approach infinite values at the residuals, this will cause problems for reservoir modelling and practical reservoir engineering calculations due to the singularities. The new correlation exhibits the traditional capillary pressure shape, but a finite capillary pressure value is captured at both irreducible water saturation as well as residual oil saturation. For mixed-wet reservoirs, the spontaneous wa...
This paper presents and demonstrates a systematic approach to the selection of experimental desig... more This paper presents and demonstrates a systematic approach to the selection of experimental designs leading to accurate estimates of relative permeability and capillary pressure functions for two-phase flow in porous media. The objective is to select the most ...
Reliable experimental capillary pressure and electrical properties as functions of saturation his... more Reliable experimental capillary pressure and electrical properties as functions of saturation history are essential as inputs for static and dynamic modeling of a reservoir. The only technique that simultaneously gives both capillary pressure and resistivity index as functions of saturation history, and does not rely on a model with underlying assumptions for calculation, is the porous-plate desaturation method. The main disadvantage with this method is that it is time consuming, caused by the low ux through the porous plate or membrane. We present drainage capillary pressure curves and resistivity index measured on reservoir rock samples by the porous-plate method at pseudo reservoir conditions. In parallel with this, another plug set has been analyzed by interrupting intermediate capillary displacement pressures before reaching equilibrium, with the objective of establishing S w-RI relationship much faster. The results show that it is possible to establish identical S w-RI relationship with a time-saving factor of three for the carbonate rock type under study. The saturation data were tted to an exponential-decay model using nonlinear regression in order to derive accurate capillary pressure curves from short-wait porous-plate measurements. A similar model was suggested to describe the resistivity index change and was found to occur at a faster rate than the water saturation change.
ABSTRACT Simultaneous determination of relative permeability and capillary pressure curves by inc... more ABSTRACT Simultaneous determination of relative permeability and capillary pressure curves by including more than one set of experimental data in the interpretation process is presented. A numerical simulator is introduced for history matching purposes to avoid the ...
There are at least two key aspects of simulating mu lti-phase flow experiments. One is the actual... more There are at least two key aspects of simulating mu lti-phase flow experiments. One is the actual estimation of multiphase flow properties fro m measured data, and the other is the representation of the unknown functions for relativ e permeability and capillary pressure. It is essential that the representation of these funct ions have sufficient degrees of freedom to model
The authors describe and demonstrate a method for the determination of three-phase relative perme... more The authors describe and demonstrate a method for the determination of three-phase relative permeability functions at reservoir conditions. Two- and three-phase displacement experiments are conducted on a low-permeability chalk sample, and estimates of the three-phase relative permeability and capillary pressure functions are obtained. The authors also calculate three-phase relative permeabilities with the Stone predictive model, and they evaluate them by
There are many aspects of accessing multi-phase flow performance within oil exploitation. One is ... more There are many aspects of accessing multi-phase flow performance within oil exploitation. One is the actual determination of multiphase flow properties from measured data, and another is the representation of the unknown functions for relative permeability and capillary pressure. It is essential that these functions have sufficient degrees of freedom to model the measured data whilst remaining straightforward and easy to communicate. We propose a new analytical correlation as a possible replacement for currently adopted capillary pressure functions. As capillary pressure by definition approach infinite values at the residuals, this will cause problems for reservoir modelling and practical reservoir engineering calculations due to the singularities. The new correlation exhibits the traditional capillary pressure shape, but a finite capillary pressure value is captured at both irreducible water saturation as well as residual oil saturation. For mixed-wet reservoirs, the spontaneous wa...
This paper presents and demonstrates a systematic approach to the selection of experimental desig... more This paper presents and demonstrates a systematic approach to the selection of experimental designs leading to accurate estimates of relative permeability and capillary pressure functions for two-phase flow in porous media. The objective is to select the most ...
Reliable experimental capillary pressure and electrical properties as functions of saturation his... more Reliable experimental capillary pressure and electrical properties as functions of saturation history are essential as inputs for static and dynamic modeling of a reservoir. The only technique that simultaneously gives both capillary pressure and resistivity index as functions of saturation history, and does not rely on a model with underlying assumptions for calculation, is the porous-plate desaturation method. The main disadvantage with this method is that it is time consuming, caused by the low ux through the porous plate or membrane. We present drainage capillary pressure curves and resistivity index measured on reservoir rock samples by the porous-plate method at pseudo reservoir conditions. In parallel with this, another plug set has been analyzed by interrupting intermediate capillary displacement pressures before reaching equilibrium, with the objective of establishing S w-RI relationship much faster. The results show that it is possible to establish identical S w-RI relationship with a time-saving factor of three for the carbonate rock type under study. The saturation data were tted to an exponential-decay model using nonlinear regression in order to derive accurate capillary pressure curves from short-wait porous-plate measurements. A similar model was suggested to describe the resistivity index change and was found to occur at a faster rate than the water saturation change.
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