**Comparative Aspects of Coning Behaviour in Horizontal and Vertical Wells

Arbabi, Sepehr; Fayers, F.J.

doi:10.3997/2214-4609.201406977

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…Assuming a homogeneous reservoir with constant viscosity and neglecting capillary effects, equations for two-component, twophase flow under constant total production rate constraint can be written as (1) for oil and where ⌬ ϭ the initial density difference at the WOC at reservoir conditions. where q t is the total rate at reservoir conditions.…”

Section: Dimensionless Equationsmentioning

confidence: 99%

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Practical Procedure To Predict Cresting Behavior of Horizontal Wells

1998

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Water and gas cresting in horizontal wells are important phenomena in reservoirs that have an aquifer or a gas cap. In practical situations, many reservoirs are produced under supercritical rates, and a breakthrough of the displacing phase becomes inevitable. At the beginning of a reservoir simulation study, it is desirable to make an estimate of the breakthrough time and the post-breakthrough behavior. Grid sensitivity runs are also required to obtain the appropriate gridblock sizes. An accurate representation of cresting behavior requires a very fine grid, which is not always practical. In this work, a procedure was developed to obtain accurate breakthrough times by use of just coarse grid simulations. The flow equations were written in dimensionless form, and important parameters affecting multiphase flow were identified. Simple correlations for a quick estimate of breakthrough time, maximum oil rate, and post-breakthrough behavior were derived on the basis of an appropriate set of dimensionless variables and an extensive number of simulation runs. The effects of gridblock size and grid pattern were investigated in detail. Effects of rate, mobility ratio, well drainage area, well height, and endpoints and shapes of relative permeability curves were also included. A procedure to derive pseudofunctions, either by numerical correlations or coarse grid simulations, is also presented. These pseudofunctions can be used to improve the performance of coarse grid simulations. An optimum grid pattern to start a reservoir simulation study is proposed.An application with real data shows that the correlations and procedures derived are reliable and accurate and can be used for quick estimates before starting a reservoir simulation study.

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Section: Dimensionless Equationsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] There are also analytical and semianalytical solutions available for infinite acting and closed-boundary reservoirs. [9][10][11][12][13] Some numerical correlations are also available for predicting breakthrough time and post-breakthrough behavior for supercritical rates.…”

Section: Introductionmentioning

confidence: 99%

Practical Procedure To Predict Cresting Behavior of Horizontal Wells

1998

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“…Also, analytical models can only produce critical rates or time for breakthrough, not the behavior for super-critical rates. Arbabi and Fayers (1995) 7 have shown that different semi-analytical models presented in the literature can produce results for critical rates that are different by a factor of 24. They have proposed a new model that produces essentially the same results as careful simulations that mimic the assumptions in the analytical model.…”

Section: Analytical Cresting Modelsmentioning

confidence: 99%

“…They have proposed a new model that produces essentially the same results as careful simulations that mimic the assumptions in the analytical model. Here we present an example where we have used the technique developed by Arbabi and Fayers (1995) 7 to calculate the critical rate for our problem, under the assumption of steady-state, using average permeabilities of 433 mD in the horizontal direction and 14 mD in the vertical direction. The optimum well location, defined as the location that gives the same critical rate for both the gas and water interfaces, is predicted to be about 30 ft from the gas/oil contact with a critical oil rate of about 68 barrels per day.…”

Section: Analytical Cresting Modelsmentioning

confidence: 99%

Productivity and Injectivity of Horizontal Wells

Aziz¹,

Arababi²,

Hewett³

1997

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“…Also, analytical models can only produce critical rate or time for breakthrough, not the behavior for super-critical rates. Arbabi and Fayers (1995)3 have shown that different analytical models presented in the literature can produce results for critical rates that are different by a factor of 24. They have proposed a new mode1 that produces essentially the same results as careful simulations that mimic the assumptions in the analytical model.…”

Section: Analytical Cresting Modelsmentioning

confidence: 99%