Pressure Distribution During Steady Flow in Unsaturated Sands

Scott, Verne H.; Corey, A. T.

doi:10.2136/sssaj1961.03615995002500040013x

Cited by 9 publications

(6 citation statements)

References 1 publication

(1 reference statement)

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“…This transition region represents the zone of highest capillary pressure in the coarser soil; consequently, it is the region having the lowest degree of saturation in the soil-water system. This interesting phenomenon was also observed by Scott and Corey [1961]. Soil overlying another o/ coarser texture.…”

Section: [D(pc/'y)]/dz -I --(Q/c•)supporting

confidence: 67%

“…First, the derivatives of the functions are discontinuous at the point Pc = P,; this makes step integration a necessity in most problems. Secondly, at the transition in the Co versus Po curves, the values of Ce obtained for some types of soil by Scott and Corey [1961], by Gardner [1958], and in this study The terms in the last parentheses can be considered negligible, because the values (after substituting for x and n > 2) are small. This seems justifiable, as nearly all mediums have values of n greater than 2.…”

mentioning

confidence: 60%

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Steady Downward Flow to a Water Table

Arbhabhirama¹,

Kridakorn²

1968

Water Resources Research

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A partially saturated zone in a porous medium is usually found above a water table when the rate of downward flow per unit area of cross section is less than the hydraulic conductivity of the porous medium. Theoretical solutions describing the distribution of capillary pressure above the water table during steady downward flow are presented. Experiments were conducted, using water as the wetting fluid and air as the nonwetting fluid, for both homogeneous and stratified media. The experimental results show good agreement with the theory. (

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Section: [D(pc/'y)]/dz -I --(Q/c•)supporting

confidence: 67%

mentioning

confidence: 60%

Steady Downward Flow to a Water Table

Arbhabhirama¹,

Kridakorn²

1968

Water Resources Research

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“…[141][142][143][144][145][146][147] In the CRP, the drying rate is controlled by external conditions. Fluid is supplied via capillary-driven transport to the external surface(s) of the component, where evaporation takes place.…”

Section: Drying Behaviormentioning

confidence: 99%

Colloidal Processing of Ceramics

Lewis

2000

Journal of the American Ceramic Society

1,195

640

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Colloidal processing of ceramics is reviewed with an emphasis on interparticle forces, suspension rheology, consolidation techniques, and drying behavior. Particular attention is given to the scientific concepts that underpin the fabrication of particulate-derived ceramic components. The complex interplay between suspension stability and its structural evolution during colloidal processing is highlighted.

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“…While in dynamic reservoirs the pressure distribution is given by the dynamic pressure profiles defined by Eqs. (13)- (15). Whether a particular reservoir will behave as dynamic or static is a function of the relative permeability vs. saturation behavior of the reservoir and the seal, the capillary pressure function of the reservoir and the seal, and the influx rate from the source rock.…”

Section: Dynamic Vs Static Reservoirsmentioning

confidence: 99%

“…Under these conditions the oil and water pressure gradients in the reservoir and the seal correspond to the dynamic pressure gradients defined by Eqs. (13)- (15). However, if S* is less than S A then the seal is termed as a static seal (shown by S 2 * in Fig.…”

Section: Dynamic Vs Static Reservoirsmentioning

confidence: 99%

Defining Fluid Distribution and Fluid Contacts for Dynamically Charged Reservoirs

Siddiqui

1999

All Days

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractDefining fluid contacts(GWC/OWC/GOC) is one of the major variables for defining the initial hydrocarbons in place. In exploratory wells RFT/MDT is often used to define OWC/GWC. In defining contacts static capillary-buoyancy equilibrium is assumed. There is ample field evidence that many of the existing reservoirs are actively being charged from the source rocks. Under these conditions the assumption of static fluid distributions may not be valid and dynamic conditions should be used for defining the fluid distributions and the contacts. This paper defines the fluid distributions and fluid contacts for dynamically charged reservoirs. The method is based on the recently proposed Dynamic Theory of Hydrocarbon Migration and Trapping. The results of numerous numerical simulations show that assuming static saturation profiles may not be valid for reservoirs having active influx of fluids into them. This is true even at very small influx rates (10 -9 m/s-10 -14 m/s). The pressure profiles for the static case (no viscous forces) are compared and contrasted with the dynamic pressure profiles. The dynamic pressure drops can be explained on the basis of Darcy's law and relative permeability effects under extreme saturations. These pressure drops are then used to calculate the saturation distribution in the hydrocarbon column and the transition zones. The results show that if the assumption of static equilibrium is used for the dynamically charged reservoirs it will lead to the underestimation of the initial hydrocarbon in place. The non-equilibrium effects can also explain free water production from zones far above the transition zone, expected, on the basis of static assumption. The interpretation of MDT data under both static and dynamic conditions is also discussed.

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Pressure Distribution During Steady Flow in Unsaturated Sands

Cited by 9 publications

References 1 publication

Steady Downward Flow to a Water Table

Steady Downward Flow to a Water Table

Colloidal Processing of Ceramics

Defining Fluid Distribution and Fluid Contacts for Dynamically Charged Reservoirs

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