Literature Review on Correlations of the Non-Darcy Coefficient

Li, Dacun; Engler, Thomas W.

doi:10.2118/70015-ms

Cited by 108 publications

(35 citation statements)

References 33 publications

(57 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Then the REV determined by nonDarcy coefficient and the REV determined by inherent permeability should be consistent, but more studies have shown that the non-Darcy coefficient is not only related to the intrinsic permeability of media. Evans and Civan [52], Geertsma [53], and Macdonald et al [54] found that nonDarcy coefficient is also related to the effective porosity of the pore medium; Li and Engler [55] and Veyskarami et al [56] proposed that, for isotropic media, several correlations relate to petrophysical parameters (in particular , k, and the tortuosity ); Knupp and Lage [57] also pointed out that is related to the inherent permeability and inertia coefficient , where represents the microform resistance exerted by the solid porous substrate; that is to say, it depends on the geometry of the solids in each basic representative volume of the porous medium. It is noteworthy that and are independent parameters.…”

Section: Discussionmentioning

confidence: 99%

Study on the REV Size of Fractured Rock in the Non-Darcy Flow Based on the Dual-Porosity Model

2018

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Study on the REV Size of Fractured Rock in the Non-Darcy Flow Based on the Dual-Porosity Model

2018

View full text Add to dashboard Cite

“…was also called velocity coefficient [26], inertial resistance coefficient [27,28], turbulence factor [29,30], inertial coefficient [31], and so on. Although can be determined by (5a) and (5b), it is important to hold that is a function of the porous medium such as and [32]. Chen et al [33] and Zhou et al [34,35] confirmed that the relation between and follows a power law in the form of…”

Section: Prediction Of Hydraulic Properties Evolutionmentioning

confidence: 99%

Experimental Investigation on Hydraulic Properties of Granular Sandstone and Mudstone Mixtures

Cai

Zhou

et al. 2018

Geofluids

View full text Add to dashboard Cite

The caved zone during longwall mining has high permeability, resulting in a mass of groundwater storage which causes a threat of groundwater inrush hazard to the safe mining. To investigate the hazard mechanism of granular sandstone and mudstone mixture (SMM) in caved zone, this paper presents an experimental study on the effect of sandstone particle (SP) and mudstone particle (MP) weight ratio on the non-Darcy hydraulic properties evolution. A self-designed granular rock seepage experimental equipment has been applied to conduct the experiments. The variation of particle size distribution was induced by loading and water seepage during the test, which indicated that the particle crushing and erosion properties of mudstone were higher than those of sandstone. Porosity evolution of SMM was strongly influenced by loading (sample height) and SP/MP weight ratio. The sample with higher sample height and higher weight ratio of SP achieved higher porosity value. In particular, a non-Darcy equation, for hydraulic properties (permeability and non-Darcy coefficient ) calculation, was sufficient to fit the relation between the hydraulic gradient and seepage velocity. The test results indicated that, due to the absence and narrowing of fracture and void during loading, the permeability decreases and the non-Darcy coefficient increases. The variation of the hydraulic properties of the sample within the same particle size and SP/MP weight ratio indicated that groundwater inrush hazard showed a higher probability of occurrence in sandstone strata and crushed zone (e.g., faults). Moreover, isolated fractures and voids were able to achieve the changeover from self-extension to interconnection at the last loading stage, which caused the fluctuation tendency of and . Fluctuation ability in mudstone was higher than that in sandstone. The performance of an empirical model was also investigated for the non-Darcy hydraulic properties evolution prediction of crushing and seepage processes. The predictive results indicated that particle crushing and water erosion caused the increase of hydraulic properties, being the main reason that the experimental values are typically higher than those obtained from the predictive model. The empirical model has a high degree of predictive accuracy; however, has a higher predictive accuracy than . Furthermore, the predictive accuracy of increases and decreases with increasing weight ratio of SP.

show abstract

“…These equations are based on the assumption that Forchheimer equation (4) parameter  is not straight forward and several experimental correlations have been proposed to estimate this parameter [10].…”

Section: Developed Analytical Modelmentioning

confidence: 99%

“…While the assumption of laminar flow near wellbore for oil reservoirs may be justified, this will introduce a significant error when applies to gas wells where turbulent flow near wellbore is dominant [10] [11]. This implies that Darcy flow calculations cannot be used to modify the induced stresses around the wellbore in case of a gas well.…”

Section: Introductionmentioning

confidence: 99%

The effect of Non-Darcy Flow on Induced Stresses Around a Wellbore in an anisotropic in-situ stress field

2017

View full text Add to dashboard Cite

After drilling a well, the stresses will be altered and the induced stresses present the new state of stress. These induced stresses which result in geomechanical problems. The studies indicate that the flow of hydrocarbon into the wellbore influences the induced stresses. Darcy equation has been used in the past; however, the laminar flow assumption embedded in this equation cannot correctly model the flow of fluid when a nonDarcy flow dominates near a wellbore. Example of such situation includes the gas wells.In this study, analytical equations are developed to incorporate the effect of nonDarcy flow on the induced stresses around a wellbore. These equations developed based on Forchheimer flow equation. Then the simplified solutions were presented by considering the second term of Forchheimer flow equation. It was found that the difference between the results from Darcy and nonDarcy flow models is proportional to the drawdown pressure.Further studies included numerical simulation of non-Darcy fluid flow in a typical reservoir.Comparison of the results with the analytical models indicated that the magnitude of stresses in non-Darcy flow is larger than of Darcy flow.Finally, sensitivity of the reservoir properties on the induced stresses in the non-Darcy flow regime was investigated.

show abstract

Literature Review on Correlations of the Non-Darcy Coefficient

Cited by 108 publications

References 33 publications

Study on the REV Size of Fractured Rock in the Non-Darcy Flow Based on the Dual-Porosity Model

Study on the REV Size of Fractured Rock in the Non-Darcy Flow Based on the Dual-Porosity Model

Experimental Investigation on Hydraulic Properties of Granular Sandstone and Mudstone Mixtures

The effect of Non-Darcy Flow on Induced Stresses Around a Wellbore in an anisotropic in-situ stress field

Contact Info

Product

Resources

About