Geoinformatika 2017; 3(63) : 23-29 (in Ukrainian)
MODELING OF PRODUCING PRESSURE IN HETEROGENEOUS OIL-BEARING RESERVOIRS
M.V. Lubkov
Poltava Gravimetric Observatory of the Institute of Geophysics of Ukraine, NAS of Ukraine, 27/29, Myasoedova Str., Poltava, 36015, Ukraine, e-mail: mikhail.lubkov@ukr.net
Purpose. The problems connected with increasing of efficiency of development and operation of oil-bearing deposits are growing ever more important today. They are caused by the rapid growth of oil production, associated with reducing its water overflowing, increasing oil recovery, to achieve economic efficiency. In this situation, there are popular methods of computer modeling of productive reservoirs, which allow one to get information on the structure and characteristics of the reservoir, as well as the distribution parameters of permeability and fluids in it. They also permit to evaluate and calculate uncertainty arising from the lack of information about the reservoir properties outside the well. Currently there exist many methods of computer modeling, which solve various practical problems. On the other hand, there are a number of problems related to the accuracy and adequacy of simulation of heterogeneous multiphase permeable collector systems in real-term exploitation of oil deposits.
Design/methodology/approach. On the basis of the combined finite-element-difference method for solving the non-stationary piezoconductivity problem, calculating heterogeneous distribution of permeable characteristics of the collector deformable reservoir, we carried out modeling of the producing pressures in oil-bearing reservoirs.
Findings. The results of computer modeling show that the drop of reservoir pressure in the vicinity of acting wells depends primarily on collector properties of the reservoir and permeable character on the boundaries of the deposit. The nature of the drop of reservoir pressure near acting wells is similar in character to the radial. During exploitation, radius and slope of the area of falling reservoir pressure around the well are gradually increasing. Moreover, the speed of this process is determined by collector reservoir characteristics (porosity, permeability, viscosity of gas-liquid phase), and by the character of permeability of collector rocks on the boundaries of the deposit. Reducing the porosity and permeability of the reservoir and increasing the viscosity of gas-liquid phase lead to a noticeable drop in oil production. Location of injection wells at distances not exceeding 1.5 km from the production wells results in a significant increase of the reservoir pressure in the vicinity of these wells and, accordingly, to the increase of oil production.
Practical value/implications. The obtained results may be used in practical geophysical works with the purpose of optimizing oil production activity. The presented method may further be used for more detailed investigation of heterogeneous oil-bearing deposits.
Keywords: computer modeling, reservoir pressure, oil-bearing deposits, geophysical interpretation.
The full text of papers will be available after 01/04/2019
References:
- Aziz H., Settari Je. Matematicheskoe modelirovanie plastovyh sistem. Moscow: Institut komp’juternyh. issledovanij, 2004, 416 p. [in Russian].
- Basniev K.S., Dmitriev N.M., Rozenberg G.D. Neftegazovaja gidromehanika: uchebnoe poso-bie dlja vuzov. Moscow: Institut komp’juternyh issledovanij, 2003, 479 p. [in Russian].
- Kanevskaja R.D. Matematicheskoe modelirovanie razrabotki mestorozhdenij uglevodorodov. Moscow: Institut komp’juternyh issledovanij, 2003, 128 p. [in Russian].
- Koshljak V.A. Granitoidnye kollektory nefti i gaza. Ufa: Tau, 2002, 256 p. [in Russian].
- Lebedinec I.P. Izuchenie i razrabotka neftjanyh mestorozhdenij s treshсhinovatymi kollektorami. Moscow: Nauka, 1997, 231 p. [in Russian].
- Lubkov M.V. Modeling of the heat processes in the zone of modern activity of Dniepr-Donetsk Depression. Geoinformatika, 2014, no. 1, pp. 46-53 [in Ukrainian].
- Сhen Z., Huan G., Ma Y. Computational methods for multiphase flows in porous media. Philadelphia: Society for Industrial and Applied Mathematics, 2006. 521 p.
- Ertekin T., Abou-Kassem J.H., King G.R. Basic applied reservoir simulation. Texas: Richardson, 2001. 421 p.
- Gerya T.V., Perchuk L.L., Van Reenein D.D., Smit C.A. Two-dimensional numerical modeling of pressure-temperature-time path for exhumation of some granulite facies. Journal of Geodynamics, 2000, vol. 29, pp. 46-53.
- Gerya T. Introduction to numerical geodynamics. Cambridge: Cambridge University Press, 2010. 345 p.