An Analytical Solution for Water Coning in Vertical Wells

2012 ◽  
Vol 27 (02) ◽  
pp. 195-204 ◽  
Author(s):  
Mohammad Tabatabaei ◽  
Ali Ghalambor ◽  
Boyun Guo
Keyword(s):  
Analytical Solution ◽  
Vertical Wells ◽  
Water Coning

Prediction of Capillary Fluid Interfaces During Gas or Water Coning in Vertical Wells

SPE Journal ◽  
2005 ◽  
Vol 10 (04) ◽  
pp. 440-448 ◽  
Author(s):  
Russell T. Johns ◽  
Larry W. Lake ◽  
Rafay Z. Ansari ◽  
Arnaud M. Delliste
Keyword(s):  
Fluid Interfaces ◽  
Vertical Wells ◽  
Water Coning ◽  
Capillary Fluid

Critical Rate for Water Coning: Correlation and Analytical Solution

1989 ◽  
Vol 4 (04) ◽  
pp. 495-502 ◽  
Author(s):  
Leif A. Høyland ◽  
Paul Papatzacos ◽  
Svein M. Skjaeveland
Keyword(s):  
Analytical Solution ◽  
Critical Rate ◽  
Water Coning

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

2021 ◽  
Author(s):  
Ekhwaiter Abobaker ◽  
Abadelhalim Elsanoose ◽  
Faisal Khan ◽  
Mohammad Azizur Rahman ◽  
Amer Aborig ◽  
...  
Keyword(s):  
Accurate Estimation ◽  
The Novel ◽  
Vertical Wells ◽  
Simple Correlation ◽  
Partial Penetration ◽  
Skin Factor ◽  
New Correlation ◽  
Water Coning ◽  
Partial Completion ◽  
Fluid Characteristics

AbstractAn 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.

scholarly journals Integrated-reservoir-model-based critical oil rate correlation for vertical wells in thin oil rim reservoirs in the Niger Delta

2018 ◽  
Vol 7 (3) ◽  
pp. 1757
Author(s):  
Anietie Ndarake Okon ◽  
Dulu Appah
Keyword(s):  
Niger Delta ◽  
Sensitivity Study ◽  
Coefficient Of Determination ◽  
Limited Attention ◽  
Optimization Approach ◽  
Reservoir Model ◽  
Vertical Wells ◽  
Chi Square ◽  
Water Coning ◽  
Oil Rim

Thin oil rim reservoirs are mostly characterized by development and production challenges; one of which is early water coning tendency. In the Niger Delta, most developed critical oil rate correlations to avert coning focused on conventional bottom-water drive reservoirs, while thin oil rim reservoirs received limited attention. Available correlations to estimate critical oil rate of thin oil rim reservoirs in Niger Delta are based on generic reservoir models, which does not consider the reservoir heterogeneity. Hence, it leaves these available correlations’ predictions in doubt, considering the sensitive nature of developing thin oil rim reservoirs. Thus, a correlation for critical oil rate (qc) based on integrated reservoir model in the Niger Delta was develop for thin oil rim reservoirs using multivariable numerical optimization approach. The obtained result indicated that the developed correlation predicted 226.05 bbl/day compared to the actual Oilfield critical oil rate of 226.11 bbl/day. Furthermore, sensitivity study indicated that the developed correlation and the integrated reservoir model predictions of fractional well penetration (hp/h) and height below perforation - oil column (hbp/h) on critical oil rate (qc) were close and resulted in coefficient of determination (R2) of 0.9266 and 0.9525, Chi square (X2) of 0.539 and 0.655, and RMSE of 4.336 and 4.357. Additionally, the results depict that critical oil rate depends indirectly on fractional well penetration and directly on height above perforation for vertical wells. Therefore, to delay water-coning tendency in thin oil rim reservoirs these completion parameters are consideration in vertical wells to establish optimum critical oil rate during hydrocarbons production. Also, the developed correlation can be used as a quick tool to estimate critical oil rate of thin oil rim reservoirs in the Niger Delta.  

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