Submit an Article
Become a reviewer

Search articles for by keywords:
capillary pressures

Oil and gas
  • Date submitted
    2020-05-05
  • Date accepted
    2020-10-05
  • Date published
    2020-11-24

Assessment of the Influence of Water Saturation and Capillary Pressure Gradients on Size Formation of Two-Phase Filtration Zone in Compressed Low-Permeable Reservoir

Article preview

The paper examines the influence of capillary pressure and water saturation ratio gradients on the size of the two-phase filtration zone during flooding of a low-permeable reservoir. Variations of water saturation ratio s in the zone of two-phase filtration are associated with the pressure variation of water injected into the reservoir; moreover the law of variation of water saturation ratio s ( r , t ) must correspond to the variation of injection pressure, i.e. it must be described by the same functions, as the functions of water pressure variation, but be subject to its own boundary conditions. The paper considers five options of s ( r , t ) dependency on time and coordinates. In order to estimate the influence of formation and fluid compressibility, the authors examine Rapoport – Lis model for incompressible media with a violated lower limit for Darcy’s law application and a time-dependent radius of oil displacement by water. When the lower limit for Darcy’s law application is violated, the radius of the displacement front depends on the value of capillary pressure gradient and the assignment of s function. It is shown that displacement front radii contain coefficients that carry information about physical properties of the reservoir and the displacement fluid. A comparison of two-phase filtration radii for incompressible and compressible reservoirs is performed. The influence of capillary pressure gradient and functional dependencies of water saturation ratio on oil displacement in low-permeable reservoirs is assessed. It is identified that capillary pressure gradient has practically no effect on the size of the two-phase filtration zone and the share of water in the arbitrary point of the formation, whereas the variation of water saturation ratio and reservoir compressibility exert a significant influence thereupon.

How to cite: Korotenko V.A., Grachev S.I., kushakova N.P., Mulyavin S.F. Assessment of the Influence of Water Saturation and Capillary Pressure Gradients on Size Formation of Two-Phase Filtration Zone in Compressed Low-Permeable Reservoir // Journal of Mining Institute. 2020. Vol. 245. p. 569-581. DOI: 10.31897/PMI.2020.5.9
Problems in geodynamic and ecological safety in the exploration of fields of oil and das, their storage and transporta
  • Date submitted
    2009-10-06
  • Date accepted
    2009-12-30
  • Date published
    2010-09-22

Research of deformation, strength and filtration characteristics of Nizhnechutinskoe oil field’s reservoirs in case of depression making in the process of oilwells exploitation

Article preview

It is determined that main reasons of permeability reservoirs decrease in Nizhnechutinskoe oil field are capillary pressures and elastic stresses, appearing at depression making. It is displayed that to reduce tangential stresses in oil bearing reservoirs it is expedient to make vertical slits in oilwells’ open holes.

How to cite: Petukhov A.V., Petukhov A.A. Research of deformation, strength and filtration characteristics of Nizhnechutinskoe oil field’s reservoirs in case of depression making in the process of oilwells exploitation // Journal of Mining Institute. 2010. Vol. 188. p. 195-202.