Computation of the Pseudoskin Factor Caused by a Restricted-Entry Well Completed in a Multilayer Reservoir

Yeh, Nai-Shyong; Reynolds, Albert C.

doi:10.2118/15793-pa

Cited by 27 publications

(12 citation statements)

References 15 publications

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“…6 with k z given!>y the harmonic av~rage of all layer vertical perm~abilities, and h~ is the value of hD computed from Eq. 6 with k z replac~d by the Yeh-Reynolds 3 where g*( y) is given by the right side of Eq. 18 with liD replaced by li~.…”

Section: Resultsmentioning

confidence: 99%

“…For ranges of reservoir and well parameters ordinarily encountered, the new equations provide results approximately equal to those obtained from the Yeh-Reynolds 3 calculation procedure, but are easier to use than the Ref. 3 …”

Section: Introductionmentioning

confidence: 81%

“…Results obtained from our new multilayer analytical correlations for the pseudoskin factor caused by restricted entry are compared with results obtained from the correlation of Ref. 3 and with results obtained from a finite-difference model by use of the computational procedure discussed in Refs. 4 through 6.…”

Section: Equationmentioning

confidence: 94%

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Computation of the Pseudoskin Factor for a Restricted-Entry Well

Ding

Reynolds

1994

SPE Formation Evaluation

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 81%

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Computation of the Pseudoskin Factor for a Restricted-Entry Well

Ding

Reynolds

1994

SPE Formation Evaluation

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“…No corresponding results for a general multilayer case have been reported. As a subset of the problem, Yeh and Reynolds 10,11 developed a heuristic equation to compute a partial completion skin factor for a multilayer reservoir with crossflow. Abbaszadeh et al 12 obtained an analytical expression for the transient pressure in a multilayer case, extending the approach used by Yeh and Reynolds.…”

Section: Near-well Flow Restrictionsmentioning

confidence: 99%

“…Abbaszadeh et al 12 obtained an analytical expression for the transient pressure in a multilayer case, extending the approach used by Yeh and Reynolds. 10 Their approach needs to be further extended or modified for the desired total skin calculation.…”

Section: Near-well Flow Restrictionsmentioning

confidence: 99%

Modeling Nonlinear Interactions Among Near-Well Flow Restrictions in Well-Deliverability Prediction and Simulation

Hwang

2000

SPE Reservoir Evaluation &Amp; Engineering

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This work describes simulation of well productivity reduction due to near-well flow restrictions. The flow restrictions considered include: mechanical skin, partial completion, altered formation due to residual completion fluid or liquid dropout, and non-Darcy flow effects. It addresses two specific issues. The first is how to predict changes in well performance induced by changes in near-well parameters, as needed in history matching and well test analysis. A subset of this issue is how to estimate the impact of using well parameters to simplify simulation models such as partial completion skin and non-Darcy flow skin, instead of using more layers and solving the non-Darcy flow equation. The second issue is how to accurately preserve well productivity in a large grid block, as in the case of well productivity reduced by liquid dropout in a gas condensate reservoir model.To resolve these issues, this work uses direct simulation and heuristic total skin equations developed for one-dimensional and two-dimensional multilayered cases with crossflow. The equation correctly represents the effects of nonlinear interactions among near-well flow restrictions on well productivity, resulting in an effective total skin that is much larger than the conventional linear sum of individual skin components. Numerical examples show the total skin equation can be used to predict well performance and to accurately preserve well productivity in a field-scale gas condensate reservoir model. The latter use of the equation shows a feedback mechanism, wherein the total skin is used to adjust the coarse-grid well productivity.

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Quantifying the partial penetration skin factor for evaluating the completion efficiency of vertical oil wells

Abobaker

Elsanoose

Khan

et al. 2021

J Petrol Explor Prod Technol

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An oil well's productivity is generally considered the standard measure of the well's performance. However, productivity depends on several factors, including fluid characteristics, formation damage, the reservoir's formation, and the kind of completion the well undergoes. How a partial completion can affect a well's performance will be investigated in detail in this study, as nearly every vertical well is only partially completed as a result of gas cap or water coning issues. Partially penetrated wells typically experience a larger pressure drop of fluid flow caused by restricted regions, thus increasing the skin factor. A major challenge for engineers when developing completion designs or optimizing skin factor variables is devising and testing suitable partial penetration skin and comparing completion options. Several researchers have studied and calculated a partial penetration skin factor, but some of their results tend to be inaccurate and cause excessive errors. The present work proposes experimental work and a numerical simulation model for accurate estimation of the pseudo-skin factor for partially penetrated wells. The work developed a simple correlation for predicting the partial penetration skin factor for perforated vertical wells. The work also compared the results from available models that are widely accepted by the industry as a basis for gauging the accuracy of the new correlation in estimating the skin factor. Compared to other approaches, the novel correlation performs well by providing estimates for the partial penetration skin factor that are relatively close to those obtained by the tested models. This work's main contribution is the presentation of a novel correlation that simplifies the estimation of the partial penetration skin factor in partially completed vertical wells.

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Computation of the Pseudoskin Factor Caused by a Restricted-Entry Well Completed in a Multilayer Reservoir

Cited by 27 publications

References 15 publications

Computation of the Pseudoskin Factor for a Restricted-Entry Well

Computation of the Pseudoskin Factor for a Restricted-Entry Well

Modeling Nonlinear Interactions Among Near-Well Flow Restrictions in Well-Deliverability Prediction and Simulation

Quantifying the partial penetration skin factor for evaluating the completion efficiency of vertical oil wells

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