Geoinformatika 2019; 4(72) : 74-81

УДК 553.982

MODELING OF FILTRATION PROCESSES IN HETEROGENEOUS ANISOTROPIC OIL-BEARING RESERVOIRS

M.V. Lubkov, O.O. Zaharchuk

Poltava Gravimetric Observatory of Institute of Geophysics of Ukraine National Academy of Science, 27/29 Mysoedova Str., Poltava 36014, Ukraine, e-mail: mikhail.lubkov@ukr.net

Purpose. Nowadays there are important problems of increasing efficiency of development and exploitation of oil deposits. There are problems associated with the growth of oil production in heterogeneous anisotropic reservoirs, increasing oil recovery, achieving economic efficiency and so on. In this situation, there are popular methods of computer modeling of productive reservoirs, because they allow getting information of the structure and characteristics of the oil reservoir, the distribution parameters of permeability and other important factors in it. They also allow evaluating and calculating uncertainty arising from the lack of information about the oil reservoir properties outside the well.
Currently there are many methods of computer modeling, allowing solving various practical problems. Another hand there left some problems related to the accuracy and adequacy of simulation of heterogeneous anisotropic permeable collector systems in real conditions of oil deposits exploitation.

Design/methodology/approach. On the base of combined finite-element-difference method for solving the nonstationary anisotropic piezoconductivity problem, with calculating of heterogeneous distribution of permeable characteristics of the deformable oil reservoir, we carried out modeling of filtration processes in heterogeneous anisotropic oil reservoir in close and remote zones of producing well.

Findings. The results of computer modeling show that intensity of the filtration process in vicinity of oil production wells depends essentially on its location in the anisotropic reservoir, both in the near (R^a<5 m) and remote (R^a>5 m) zones of acting well. Moreover, the effect of anisotropy of the oil permeability in the remote zone is greater compared to the effect in the close well zone. The obtained results show for effective exploitation of anisotropic reservoirs it is necessary to place producing wells into the local areas with relatively low anisotropy of reservoir permeability, especially to avoid places with shear anisotropy. Before installation of production wells in anisotropic oil reservoirs, it is necessary to carry out a systematic analysis of the surrounding anisotropy of the reservoirs with the purpose to ensure effective dynamics of the filtration processes around these wells. Obviously, the best conditions for oil production processes in any practical case we can achieve due to optimal selection of all anisotropic filtration parameters of the oil reservoir.

Practical value/implications: One can use obtained results for practical geophysical works with a purpose optimizing of oil production activity in heterogeneous anisotropic reservoirs. In further it is interesting to use presented method for more detailed investigation of heterogeneous anisotropic oil-bearing deposits.

Keywords: computer modeling, anisotropic filtration processes, oil reservoirs.

References

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Received 26/11/2019