Capillarity characters measurement and effects analysis in different permeability formations during waterflooding

Li, Ying; Li, Haitao; Chen, Shengnan; Mbia, Ernest Ncha; Wang, Ke; Ren, Houlin

doi:10.1016/j.fuel.2016.12.088

Cited by 26 publications

(16 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8,40 The thickness of the boundary layer is suggested to be associated with the pore radius of porous media, the displacement gradient, and the fluid viscosity. 8,40 The thickness of the boundary layer is suggested to be associated with the pore radius of porous media, the displacement gradient, and the fluid viscosity.…”

Section: Experimental Methodologiesmentioning

confidence: 99%

“…The average capillary pressure and the average water saturation of the whole core sample at each time t n are calculated using the same way presented in our previous work. 8,40 The thickness of the boundary layer is suggested to be associated with the pore radius of porous media, the displacement gradient, and the fluid viscosity. 41,42 In this work, the where h represents the boundary layer thickness, μm; r stands for the pore radius, μm; ∇p denotes the displacement pressure gradient, MPa/m; and represents the fluid viscosity, mPa·s.…”

Section: Experimental Methodologiesmentioning

confidence: 99%

“…5,6 The dynamic capillarity means a dynamic effect on the capillary pressure; that is, P c -S w relationship not only depends on the fluid saturation, but also the time derivative of saturation S w ∕ t. The fluid flow behavior is correspondingly affected by the dynamic capillarity. 8 8 …”

Section: Introductionmentioning

confidence: 99%

“…7 Figure 1 depicts the difference between the transient displacement process and the steady displacement process caused by the dynamic effect. 8…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamic capillarity during displacement process in fractured tight reservoirs with multiple fluid viscosities

Luo

et al. 2019

Energy Science & Engineering

Self Cite

View full text Add to dashboard Cite

Dynamic capillarity commonly exists for multiphase flow in porous media, during which fluid viscosity varies and has strong influence. Displacement experiments are conducted on water-wet, fractured tight rock at in situ pressure and temperature of an oil reservoir via a specially designed apparatus to investigate the effects of fluid viscosity on the dynamic capillarity. The dynamic effect in the matrix is examined through the measurement and calculation of capillary pressure, the dynamic coefficient, and the fluid flow behavior. The results show that with a higher oil viscosity:(a) both the steady and the dynamic capillary pressures reverse their directions more quickly and behave as larger resistances in the matrix; (b) the difference between the steady and the dynamic capillary pressures becomes around 5%-19% more significant; (c) water saturation changes more slowly corresponding to the lower water relative permeability, while oil relative permeability quickly becomes lower than that during the basic displacement process; and (d) the dynamic coefficient becomes 2-3 times higher, and the dynamic contact angle becomes 10%-25% larger, showing a more variable interface. A contact angle advancement coefficient is proposed to identify the significance of contact angle advancement and the competition between capillary pressure and viscous force. The findings of this study can help for better understanding of multiphase flow in tight reservoirs and enhancing oil recovery.

show abstract

Section: Experimental Methodologiesmentioning

confidence: 99%

Section: Experimental Methodologiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…7 Figure 1 depicts the difference between the transient displacement process and the steady displacement process caused by the dynamic effect. 8…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic capillarity during displacement process in fractured tight reservoirs with multiple fluid viscosities

Luo

et al. 2019

Energy Science & Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…The above discrepancies have constrained the application of the qualitative approach. As far as core displacement based on NMR is concerned, it is a currently reliable method to determine the distribution of fluids in porous media [15][16][17][18][19]. However, 3D visualization of the natural core sample could not be perfectly developed.…”

Section: Introductionmentioning

confidence: 99%

The Visual and Quantitative Study of the Microoccurrence of Irreducible Water at the Pore and Throat System in a Low-Permeability Sandstone Reservoir by Using Microcomputerized Tomography

Huang

Khan

et al. 2018

Geofluids

View full text Add to dashboard Cite

The microflow equipment monitored with micro X-ray computerized tomography (CT) is employed to investigate the microoccurrence of the irreducible water in a low-permeability sandstone core. By means of image segmentation and the threedimensional (3D) image reconstruction technique, the visual microdistribution characteristics of irreducible water in twodimensional (2D) slices and the 3D pore-throat system are quantitatively evaluated. Some interesting findings are list as below. Firstly, due to the variant micro geometric structures of the pore-throat systems, specific core slices showed significantly different irreducible water saturation even though these slices had same areal porosity. Secondly, due to the influence of capillary trapping and the existence of oil-wetting clay (main chlorite), the irreducible water saturation in the throat system (64%) is much larger than that in the pore system (36%). Furthermore, the wetting phase (irreducible water) did not spread all over the surface of the pore-throat network which caused a much more complicated oil-water two-phase interface. Thirdly, in micro scale, the main irreducible water occurrence mode in the pore system is much different from that in the throat system. In the pore system, the irreducible water principally existed in the corner of the pores which are linked through a water film. While in the throat system, the irreducible water occurrence is dominated by the water film. However, 25.5% of the throats are blocked by the irreducible water which cut off the crude oil drainage channels.

show abstract

Investigation of the dynamic capillary pressure during displacement process in fractured tight rocks

Chen

et al. 2019

AIChE Journal

Self Cite

View full text Add to dashboard Cite

This work investigates the dynamic capillary pressure during the displacement process in fractured tight rocks, through specially designed experiments on fractured and intact core samples. The dynamic capillarity coefficient of matrix and the multiphase flow behaviors are also obtained. Results have shown that the dynamic capillary pressure of the matrix becomes around 5-20% higher after the fracturing treatment. The lower and less variable values of dynamic capillarity coefficient of matrix illustrate a weakened dynamic effect and a more uniform displacement front. Moreover, time derivative of water saturation is increased significantly with fractures. Finally, oil relative permeability after fracturing is lower than its value of the intact core at high water saturations. A dynamic capillarity coefficient model for matrix, which includes the influence of fractures, is derived and verified with the average R 2 more than 0.95. This wok helps to understand and predict multiphase flow in fractured tight porous media.

show abstract

Capillarity characters measurement and effects analysis in different permeability formations during waterflooding

Cited by 26 publications

References 45 publications

Dynamic capillarity during displacement process in fractured tight reservoirs with multiple fluid viscosities

Dynamic capillarity during displacement process in fractured tight reservoirs with multiple fluid viscosities

The Visual and Quantitative Study of the Microoccurrence of Irreducible Water at the Pore and Throat System in a Low-Permeability Sandstone Reservoir by Using Microcomputerized Tomography

Investigation of the dynamic capillary pressure during displacement process in fractured tight rocks

Contact Info

Product

Resources

About