Impact of effective pressure modification on filtration-volumetric characteristics of reservoir rocks

About the authors:

Boris V. Grigoriev, Cand. Sci. (Tech.), Associate Professor, Department of Applied and Technical Physics, Institute of Physics and Technology, University of Tyumen; b.v.grigorev@utmn.ru

Alexander A. Shubin, Tyumen State University, Magister

Abstract:

The Impact of effective pressure modification on the filtration-volumetric characteristics of productive reservoir rocks in the simulation of real thermodynamic conditions in the reservoir has been searched. The research has revealed that an increase in the effective pressure of 0 MPa to reservoir conditions — 37.1 MPa porosity decreases by 3-10%, and permeability decreases up to 95% for selected samples. With the increase in the clay fraction content in the core samples, the influence of the effective pressure on the porosity and permeability is more pronounced. The deformations resulting from cyclical changes in effective pressure of 10 MPa, are irreversible, and negatively affect the properties of the reservoir rock. It is reflected in the profitability of the development of productive formation. Such fluctuations are caused by intense drawdown during field development thereby reducing reservoir pressure and increases the pressure on the mineral skeleton rock recovery reservoir pressure during the commissioning of forcing wells not to restore reservoir properties to the previous level. Any further effective pressure fluctuation reduces reservoir properties.

References:

1.  Gimatudinov, S. K. Physics of oil and gas reservoirs: the textbook / Sh.K. Gimatudinov. Ed. 2nd, Revised. and add. Moscow: Nedra, 1971. 312 р.

2.  GOST 26450.2-85. Mining mountain. Methods for determination of reservoir properties. Enter. 02/27/1985. Moscow: State Standard of the USSR.

3. GOST 50544-93. Mining mountain. Terms and definitions. Enter. 1994.01.07. Moscow: State Standard of the Russian Federation.

4.  Dobrynin, V. M. Petrophysics: Proc. for high schools / V. M. Dobrynin, B. Yu Vendelshteyn, D. A. Kozhevnikov. Moscow: Nedra, 1991. 368 p.

5.  Hanin, A. A. Reservoir rocks of oil and gas and their study. Moscow: Nedra, 1969. 368 p.

6. Muskat, M. The fl ow of homogeneous fluids in porous media. M.; Izhevsk: Institute of Computer Science, 2004. 628 p.

7.  Physical properties of rocks and minerals (petrophysics): Handbook geophysics / edited.

N. B. Dortman. 2nd ed., Rev. and add. Moscow: Nedra, 1984. 455 p.

8.  Petrophysical research methods of core material. (Terrigenous deposits): Proc. allowance of 2 kN. / M. K. Ivanov, J. K. Burlin, G. A. Kalmykov [et al.]. Moscow: State Univ. University Press, 2008. Kn. 1. 112 s.

9.  Petrophysical research methods of core material: Textbook. allowance of 2 kN. / M. K. Ivanov, G. A. Kalmykov, V. S. Belohin [et al.]. Moscow: State Univ. University Press, 2008. Kn. 2: Laboratory methods for petrophysical studies of core samples. 113 p.

10.  Kotyahov, F. I. Physics of oil and gas reservoirs. Moscow: Nedra, 1977. 287 p.