Investigation of Dynamic Effect of Capillary Pressure in Ultra-Low Permeability Sandstones

Zhang, Haiyong; He, Shunli; Jiao, Chunyan; Luan, Guohua; Mo, Shaoyuan; Lei, Gang

doi:10.1007/s40098-014-0109-3

Cited by 18 publications

(17 citation statements)

References 18 publications

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“…Although the magnitude of the dynamic capillarity coefficient is observed variable caused by contributors such as experimental artifacts, generally the dynamic capillarity coefficient is much higher in the lower permeability porous media compared with those of the high to medium porous media, indicating a stronger dynamic effect. The value of the dynamic capillarity coefficient can reach up to 10 13 Pa·s, indicating that the dynamic effect cannot be ignored in these tight porous media …”

Section: Introductionmentioning

confidence: 99%

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

Chen

et al. 2019

AIChE Journal

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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.

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Section: Introductionmentioning

confidence: 99%

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

Chen

et al. 2019

AIChE Journal

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“…This saturation-rate dependency of the system properties observed during non-steady state two-phase flow is referred to as dynamic capillary pressure effects [15] and a large body of literature involving experimental, modeling and theoretical studies has emerged concerning these phenomena [3,4,7,13,[15][16][17][18][19][20][21][22][23][24][25]. Studies by Stauffer [23], Kalaydjian [18], Hassanizadeh and Gray [26] suggest that an extension of the P c -S w function should include a saturation rate dependent term.…”

Section: Introductionmentioning

confidence: 99%

Scale dependency of dynamic relative permeability–satuartion curves in relation with fluid viscosity and dynamic capillary pressure effect

et al. 2016

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Capillary pressure-saturation-relative permeability relationships (P c -S w -K r ) are functions of importance in modeling and simulations of the hydrodynamics of two-phase flow in porous media. These relationships are found to be affected by porous medium and fluid properties but the manner in which they are affected is a topic of intense discussion. For example, reported trends in fluid viscosity and boundary conditions effects have been found to be contrary to each other in different studies. In this work, we determine the dependency of dynamic K r -S w relationships (averaged data) on domain scale in addition to investigating the effects of fluid viscosity and boundary pressure using silicone oil (i.e. 200 and 1000 cSt) and water as the respective non-wetting and wetting fluids with a view to eliminating some of the uncertainties reported in the literature. Water relative permeability, K rw , was found to increase with increasing wetting phase saturation but decreases with the increase in viscosity ratio. On the other hand, the oil relative permeability, K rnw , was found to increase with the increasing non-wetting phase saturation in addition to the increase in viscosity ratio. Also, it was found that with the increasing boundary pressure K rw decreases while K rnw increases. The influence of scale on relative permeability was slightly indicated in the non-wetting phase with K rnw decreasing as domain size increases. Effect of measurement location on dynamic relative permeability was explored which is rarely found in the literature. Comparison was also made between K r -S w relationships obtained under static and dynamic condition. Finally, mobility ratio (m) and dynamic coefficient (s) were plotted as a function of water saturation (S w ), which showed that m decreases as s increases at a given saturation, or vice versa.

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“…9, the dynamic coefficient can be larger than 10 8 Pa•s and rises fast when permeability is lower than 15 mD. Moreover, the previous study (Zhang et al, 2015) has reported that the difference between the dynamic and steady capillary pressure can be larger than 0.1 MPa and increases along with the decrease of the average pore radius, as shown in Fig. 10.…”

Section: The Critical Condition To Consider the Dynamic Effectmentioning

confidence: 81%

The dynamic effect in capillary pressure during the displacement process in ultra-low permeability sandstone reservoirs

Cai

et al. 2018

Capillarity

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Investigation of Dynamic Effect of Capillary Pressure in Ultra-Low Permeability Sandstones

Cited by 18 publications

References 18 publications

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

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

Scale dependency of dynamic relative permeability–satuartion curves in relation with fluid viscosity and dynamic capillary pressure effect

The dynamic effect in capillary pressure during the displacement process in ultra-low permeability sandstone reservoirs

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