Improved near-well approximation for prediction of the gas/oil production ratio from oil-rim reservoirs

被引：4
|
作者：
Halvorsen, Svenn Anton [1 ]
Mjaavatten, Are [2 ]
Aasheim, Robert [3 ]
机构：
[1] Teknova AS, Kristiansand, Norway
[2] Yara Int ASA, Porsgrunn, Norway
[3] Statoil ASA, Res Ctr Porsgrunn, Porsgrunn, Norway
来源：
COMPUTATIONAL GEOSCIENCES | 2012年 / 16卷 / 02期
关键词：
Oil-rim reservoir; Horizontal well; Improved near-well model; Gas coning; Gas/oil production ratio; GOR; Gas breakthrough; GORM; One-dimensional model; Production optimization; Gravitational drainage; Dupuit-Forchheimer; Porous media equation;
D O I：
10.1007/s10596-011-9250-6
中图分类号：
TP39 [计算机的应用];
学科分类号：
081203 ; 0835 ;
摘要：
A model with short computational time has previously been developed to predict the rate-dependent gas/oil ratio (GOR) from a horizontal well. The oil flow towards the wellbore is based on a one-dimensional model by Konieczek. The model performs remarkably well for medium-time production optimization (weeks, months), while the predictions during the first days after a large change in the production can be poor. An improved one-dimensional model for the flow towards the wellbore is proposed, where the oil flow is treated as a superposition of three terms: 1) Radial flow towards the wellbore and towards a mirror well. 2) Flow to correct for modified boundary conditions due to the radial flows. 3) Flow due to height variations of the gas/oil contact (GOC). The new model takes care of the current short term and near-well deficiencies: Effect of 2D flow close to the wellbore, gas breakthrough due to viscous gas fingering, and horizontal/vertical anisotropy. Based on analysis and preliminary testing the new model should have equally good medium and long term capabilities and considerably improved short term and near-well behaviour, compared to the present implementation.
引用
收藏
页码：231 / 246
页数：16
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