#Comsol 5.1 gas flow porous verification#
#Comsol 5.1 gas flow porous code#
#Comsol 5.1 gas flow porous simulator#

Previous studies indicated that the distribution of microscopic remaining oil in reservoirs was associated with pore structure and fluid flow in pores. When the comprehensive water cut of an oilfield reaches an ultrahigh stage, macroscopic study cannot well solve the problems of remaining oil distribution, so a more detailed investigation in a pore scale is necessary. Up to now, the main studies on the remaining oil have been focused on macroscopic distribution characteristics in the aspects of well pattern control, reservoir heterogeneity and sedimentary facies belts, and so forth. The preliminary statistics indicate that the recoverable remaining oil reserve accounts for 40% of the total oil reserves but with difficulties in potential tapping.

The remaining oil is highly dispersed in reservoirs with problems of low flooding efficiency and of severely ineffective cycles. The Saertu Oilfield of Daqing has entered ultrahigh water-cut stage of development. The content of remaining oil is lower with higher oil displacement efficiency. The remaining oil is mainly distributed in state of thin film on pore surface. More pores are swept by fluids with high sweep efficiency. The flow velocity declines quickly with a short duration of high pressure. The development of detour flows is weaker in large porous channels. By contrast, in the reservoir with weaker heterogeneity of grain size and throat (corresponding to low coordinate number), high flow velocities also develop in relatively narrower pore throats with little differentiation of flow velocities. The content of remaining oil is higher with lower oil displacement efficiency. The microscopic remaining oil is mainly distributed in cluster state. Few pores are swept by injected fluids with low sweep efficiency. The flow velocity declines slowly with long duration of high pressure.

The dominant passages are developed in high capacity channel, the detour flows are created in large porous channels, and the isolated islands are formed in small porous channels. Study results show that, in the reservoir with stronger heterogeneity of grain size and throat (corresponding to high coordinate number), high flow velocities tend to occur in relatively wider pore throats with great differentiation of flow velocities. The relationship between the remaining oil distribution and microscopic flow characteristics of fluid in the pores has been analyzed. Numerical simulation is applied in this paper to study characteristics of microscopic fluid velocity and flow pressures variation in the core pores in the Beier Area of Saertu Oilfield.

#Comsol 5.1 gas flow porous verification#

The results of the verification exercise are successfully compared with those obtained using PHREEQC and the application case demonstrates the scalability of a large scale model, at least up to 32 threads.The Saertu Oilfield of Daqing in northeast China has entered ultrahigh water-cut stage of development.

#Comsol 5.1 gas flow porous code#

Then, a large scale thermo-hydro-chemical (THC) problem is solved to show the code capabilities. First, a benchmark exercise is used to test the reliability of iCP regarding flow and reactive transport.

To this end, the geochemical reactions are solved in parallel by balancing the computational load over multiple threads. Given the large computational requirements of the aforementioned coupled models, special emphasis has been placed on numerical robustness and efficiency. iCP is written in Java and uses the IPhreeqc C++ dynamic library and the COMSOL Java-API. The main goal of the interface is to maximize the synergies between the aforementioned codes, providing a numerical platform that can efficiently simulate a wide number of multiphysics problems coupled with geochemistry.

#Comsol 5.1 gas flow porous simulator#

This paper presents the development, verification and application of an efficient interface, denoted as iCP, which couples two standalone simulation programs: the general purpose Finite Element framework COMSOL Multiphysics В® and the geochemical simulator PHREEQC.