Improved near-well approximation for prediction of the gas/oil production ratio from oil-rim reservoirs |
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Authors: | Svenn Anton Halvorsen Are Mjaavatten Robert Aasheim |
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Affiliation: | 1. Teknova AS, Kristiansand, Norway 2. Yara International ASA, Porsgrunn, Norway 3. Research Centre Porsgrunn, Statoil ASA, Porsgrunn, Norway
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Abstract: | 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. |
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