Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers
Upstream oil production using dual string completion, i.e., two tubing inside a well casing, is common due to its cost advantage. High pressure gas is employed to lift the oil to the surface when there is insufficient reservoir energy to overcome the liquids static head in the tubing. However, gas l...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-06-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/12/2284 |
| _version_ | 1811304965462818816 |
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| author | Chew Chen Law Mohamed Zamrud Zainal Kew Hong Chew Jang Hyun Lee |
| author_facet | Chew Chen Law Mohamed Zamrud Zainal Kew Hong Chew Jang Hyun Lee |
| author_sort | Chew Chen Law |
| collection | DOAJ |
| description | Upstream oil production using dual string completion, i.e., two tubing inside a well casing, is common due to its cost advantage. High pressure gas is employed to lift the oil to the surface when there is insufficient reservoir energy to overcome the liquids static head in the tubing. However, gas lifting for this type of completion can be complicated. This is due to the operating condition where total gas is injected into the common annulus and then allowed to be distributed among the two strings without any surface control. High uncertainties often result from the methods used to determine the split factor—the ratio between the gas lift rate to one string over the total gas injected. A hybrid model which combined three platforms: the Visual Basics for Application programme, PROSPER (a nodal analysis tool) and Excel spreadsheet, is proposed for the estimation of the split factor. The model takes into consideration two important parameters, i.e., the lift gas pressure gradient along the annulus and the multiphase pressure drop inside the tubing to estimate the gas lift rate to the individual string and subsequently the split factor. The proposed model is able to predict the split factor to within 2% to 7% accuracy from the field measured data. Accurate knowledge of the amount of gas injected into each string leads to a more efficient use of lift gas, improving the energy efficiency of the oil productions facilities and contributing toward the sustainability of fossil fuel. |
| first_indexed | 2024-04-13T08:16:52Z |
| format | Article |
| id | doaj.art-6a25cbb8b73a41aeb56aa3e8440ab13a |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T08:16:52Z |
| publishDate | 2019-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-6a25cbb8b73a41aeb56aa3e8440ab13a2022-12-22T02:54:45ZengMDPI AGEnergies1996-10732019-06-011212228410.3390/en12122284en12122284Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil ProducersChew Chen Law0Mohamed Zamrud Zainal1Kew Hong Chew2Jang Hyun Lee3Department of Petroleum Engineering, Faculty of Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak Darul Ridzuan, MalaysiaDepartment of Petroleum Engineering, Faculty of Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak Darul Ridzuan, MalaysiaDepartment of Petroleum Engineering, Faculty of Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak Darul Ridzuan, MalaysiaDepartment of Petroleum Engineering, Faculty of Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak Darul Ridzuan, MalaysiaUpstream oil production using dual string completion, i.e., two tubing inside a well casing, is common due to its cost advantage. High pressure gas is employed to lift the oil to the surface when there is insufficient reservoir energy to overcome the liquids static head in the tubing. However, gas lifting for this type of completion can be complicated. This is due to the operating condition where total gas is injected into the common annulus and then allowed to be distributed among the two strings without any surface control. High uncertainties often result from the methods used to determine the split factor—the ratio between the gas lift rate to one string over the total gas injected. A hybrid model which combined three platforms: the Visual Basics for Application programme, PROSPER (a nodal analysis tool) and Excel spreadsheet, is proposed for the estimation of the split factor. The model takes into consideration two important parameters, i.e., the lift gas pressure gradient along the annulus and the multiphase pressure drop inside the tubing to estimate the gas lift rate to the individual string and subsequently the split factor. The proposed model is able to predict the split factor to within 2% to 7% accuracy from the field measured data. Accurate knowledge of the amount of gas injected into each string leads to a more efficient use of lift gas, improving the energy efficiency of the oil productions facilities and contributing toward the sustainability of fossil fuel.https://www.mdpi.com/1996-1073/12/12/2284dual string completiongas liftgas lift ratesplit factorgas robbinggas lift optimization |
| spellingShingle | Chew Chen Law Mohamed Zamrud Zainal Kew Hong Chew Jang Hyun Lee Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers Energies dual string completion gas lift gas lift rate split factor gas robbing gas lift optimization |
| title | Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers |
| title_full | Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers |
| title_fullStr | Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers |
| title_full_unstemmed | Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers |
| title_short | Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers |
| title_sort | hybrid model for determining dual string gas lift split factor in oil producers |
| topic | dual string completion gas lift gas lift rate split factor gas robbing gas lift optimization |
| url | https://www.mdpi.com/1996-1073/12/12/2284 |
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