Effect of Crossflow on Sweep Efficiency in Water/Oil Displacements in Heterogeneous Reservoirs

Fitzmorris, Robert; Kelsey, F.J.; Pande, Karan

doi:10.2118/24901-ms

Cited by 10 publications

(2 citation statements)

References 8 publications

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“…For mobilities greater than 1.0, capillary cross-flow is less important than the viscous cross-flow. Fitzmorris et al, 1992, reached similar conclusions based on a model using several Pc curves and only one Kr data-set. Their results showed that capillary cross-flow was favorable for a water-wet system while unfavorable for an oil-wet one.…”

Section: Introductionsupporting

confidence: 66%

Numerical Evaluation of the Combined Effect of Wettability and Heterogeneity on Waterflood Performance

Lenormand¹,

Li²,

Robin³

et al. 1997

IOR 1997 - 9th European Symposium on Improved Oil Recovery

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Laboratory experiments have shown that wettability affects fluid distribution at the pore scale and therefore has an important effect on the end-point saturations and the shapes of capillary pressure (Pc) and relative permeability (kr) curves. At reservoir scale, the combined effect of wettability and permeability heterogeneity is not so clear. Effects due to a change in the end-point saturations is straightforward but the ones due to the change of the shape of the Pc curve has not been studied. In reservoir simulation, the Kr curves are generally known but there is an uncertainty on the Pc curves, due to the lack of information on wettability (imbibition curves are derived from mercury porosimetry or drainage curves). The purpose of the paper is to quantify the effect of this uncertainty on oil recovery. Breakthrough times and fraction of recoverable oil during waterflood were numerically studied on a simple 2-dimensional reservoir using 3 and 5 facies. Permeability heterogeneity is characterized by its stochastic properties (variance and correlation length). In order to obtain a uniform reservoir wettability, the Pc curves of the various facies are calculated using the classical J function. The results are presented as recovery vs. correlation lengths, CL and wettability indices, WI. At intermediate flow rate ( 0.3 m/day ),• from intermediate to water-wet wettabilities (0 < WI < 1)), final (asymptotic) recovery is always near 1, recovery decreasing with an increase of the WI. The correlation length. shows no significant effect.• for oil-wet reservoirs, final recovery is about 30% less. In addition, there is a strong effect of heterogeneity : the best recovery occurs for layered reservoirs.At higher flow rates, capillary effects are comparatively reduced and the effect of wettability on recovery becomes less important.2

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Section: Introductionsupporting

confidence: 66%

Numerical Evaluation of the Combined Effect of Wettability and Heterogeneity on Waterflood Performance

Lenormand¹,

Li²,

Robin³

et al. 1997

IOR 1997 - 9th European Symposium on Improved Oil Recovery

View full text Add to dashboard Cite

show abstract

“…For such reservoirs, one of the important factors that affects sweep efficiency is cross-flow from one layer into another layer in the direction perpendicular to the main flow path (Fitzmorris et al, 1992). One possible remedy for cross-flow control is simultaneous injection of fluids with different properties (Rossen et al, 2006;Stone, 2004;Surgchev et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

A remedial method of polymer flooding to prevent cross-flow problem in a layered reservoir

Park

Jang

Hwang

et al. 2017

Energy Exploration & Exploitation

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When injecting polymer into an oil reservoir, polymer adsorption onto the grain surface may seriously clog the pore throat and decrease the permeability. This phenomenon may give rise to a severe cross-flow problem in the case of a layered reservoir with a large permeability contrast. Therefore, we proposed a remedial method, which injects polymer solution with different concentrations under the same condition of the frontal velocity at each layer, to overcome the cross-flow problem. In order to perform this task, the experimental system was built as a two-dimensional two-layered sandstone system with a large permeability contrast of 10. From the results of the experimental investigation, conventional polymer flooding was found to be inefficient in oil recovery, because of the cross-flow problem that occurred almost from the beginning of injection. Meanwhile, in the case of the suggested remedial method of polymer flooding, the oil production was significantly enhanced without showing the cross-flow problem, which was accomplished by injecting the polymer solution with different concentrations under the conditions of the same frontal velocity at each layer. Overall, the suggested injecting method was found to be sufficient to overcome the cross-flow problem in a layered reservoir.

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A new type of double dispersion system for water control in fossil hydrogen energy development

Liu

Ye³

et al. 2019

International Journal of Hydrogen Energy

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Effect of Crossflow on Sweep Efficiency in Water/Oil Displacements in Heterogeneous Reservoirs

Cited by 10 publications

References 8 publications

Numerical Evaluation of the Combined Effect of Wettability and Heterogeneity on Waterflood Performance

Numerical Evaluation of the Combined Effect of Wettability and Heterogeneity on Waterflood Performance

A remedial method of polymer flooding to prevent cross-flow problem in a layered reservoir

A new type of double dispersion system for water control in fossil hydrogen energy development

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