An Experimental Investigation of Feasibility of Gas Huff and Puff for Recovering Crude Oil with Different Viscosities
Investigating multi cyclic gas (N<sub>2</sub> and CO<sub>2</sub>) huff and puff have been conducted by long sandpack simulations with four different crude oils from Jiangsu oilfield. According to the production differential pressure and the production regularity during huff a...
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| Format: | Article |
| Language: | English |
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Reaserch Institute of Petroleum Industry
2017-11-01
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| Series: | Journal of Petroleum Science and Technology |
| Subjects: | |
| Online Access: | https://jpst.ripi.ir/article_810_ae90ee9f023923005abb5a71e522613a.pdf |
| _version_ | 1819273855312592896 |
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| author | Jiang Ping Zhang Lei Ge Jijiang Zhang Guicai Yuan Yufeng Wang Yang Pei Haihua |
| author_facet | Jiang Ping Zhang Lei Ge Jijiang Zhang Guicai Yuan Yufeng Wang Yang Pei Haihua |
| author_sort | Jiang Ping |
| collection | DOAJ |
| description | Investigating multi cyclic gas (N<sub>2</sub> and CO<sub>2</sub>) huff and puff have been conducted by long sandpack simulations with four different crude oils from Jiangsu oilfield. According to the production differential pressure and the production regularity during huff and puff, the production process was divided into three sections; the first one is free gas production section; the second section is low viscous oil production section, and the third one is gas driving exploitation section. According to the results, the production decreases with the increase of cycle times at a certain backpressure, and the effect of multi-cycle huff and puff is improved as the backpressure decreases. In the same cycle, the oil production increases as the backpressure declines. In the first huff and puff cycle, positive synergistic effects are generated while CO<sub>2</sub> and N<sub>2 </sub>are being mixed, and there is an optimum ratio between them. The amount of CO<sub>2 </sub>in the optimum ratio increases as the backpressure rises. The effect of single gas is better than that of mixed gas in multi-cycle huff and puff, and the effect of CO<sub>2</sub> is better than that of N<sub>2</sub>. The effect of huff and puff is not influenced by the injection mode. At a high backpressure, the huff-and-puff effect becomes better as the oil viscosity increases, but at low backpressure, it becomes worse with an increase in oil viscosity. The huff-and-puff effect also gets worse as the temperature rises. The oil recovery degree is improved as the CO<sub>2</sub> injection amount increases, but there is an optimal oil exchange ratio. The depressurization process should be neither too quick nor too slow in the CO<sub>2</sub> huff-and-puff process. The cyclic oil production is improved with the increase of injection rate while the average injection rate is lower than 90 L/min. The equilibrium time of CO<sub>2</sub> is shorter than that of N<sub>2</sub>. The economic return of N<sub>2</sub> huff and puff is better than that of CO<sub>2</sub> at high producing pressure drop, and light oil has higher economic returns than heavy oil. |
| first_indexed | 2024-12-23T22:59:10Z |
| format | Article |
| id | doaj.art-751c0b092bb74a619017235129648c77 |
| institution | Directory Open Access Journal |
| issn | 2251-659X 2645-3312 |
| language | English |
| last_indexed | 2024-12-23T22:59:10Z |
| publishDate | 2017-11-01 |
| publisher | Reaserch Institute of Petroleum Industry |
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| series | Journal of Petroleum Science and Technology |
| spelling | doaj.art-751c0b092bb74a619017235129648c772022-12-21T17:26:57ZengReaserch Institute of Petroleum IndustryJournal of Petroleum Science and Technology2251-659X2645-33122017-11-0174779010.22078/jpst.2017.810810An Experimental Investigation of Feasibility of Gas Huff and Puff for Recovering Crude Oil with Different ViscositiesJiang Ping0Zhang Lei1Ge Jijiang2Zhang Guicai3Yuan Yufeng4Wang Yang5Pei Haihua6China University of Petroleum (East China)China University of Petroleum (East China)China University of Petroleum (East China)China Universit of Petroleum (East China)China Petroleum & Chemical CorporationChina University of Petroleum (East China)China University of Petroleum (East China)Investigating multi cyclic gas (N<sub>2</sub> and CO<sub>2</sub>) huff and puff have been conducted by long sandpack simulations with four different crude oils from Jiangsu oilfield. According to the production differential pressure and the production regularity during huff and puff, the production process was divided into three sections; the first one is free gas production section; the second section is low viscous oil production section, and the third one is gas driving exploitation section. According to the results, the production decreases with the increase of cycle times at a certain backpressure, and the effect of multi-cycle huff and puff is improved as the backpressure decreases. In the same cycle, the oil production increases as the backpressure declines. In the first huff and puff cycle, positive synergistic effects are generated while CO<sub>2</sub> and N<sub>2 </sub>are being mixed, and there is an optimum ratio between them. The amount of CO<sub>2 </sub>in the optimum ratio increases as the backpressure rises. The effect of single gas is better than that of mixed gas in multi-cycle huff and puff, and the effect of CO<sub>2</sub> is better than that of N<sub>2</sub>. The effect of huff and puff is not influenced by the injection mode. At a high backpressure, the huff-and-puff effect becomes better as the oil viscosity increases, but at low backpressure, it becomes worse with an increase in oil viscosity. The huff-and-puff effect also gets worse as the temperature rises. The oil recovery degree is improved as the CO<sub>2</sub> injection amount increases, but there is an optimal oil exchange ratio. The depressurization process should be neither too quick nor too slow in the CO<sub>2</sub> huff-and-puff process. The cyclic oil production is improved with the increase of injection rate while the average injection rate is lower than 90 L/min. The equilibrium time of CO<sub>2</sub> is shorter than that of N<sub>2</sub>. The economic return of N<sub>2</sub> huff and puff is better than that of CO<sub>2</sub> at high producing pressure drop, and light oil has higher economic returns than heavy oil.https://jpst.ripi.ir/article_810_ae90ee9f023923005abb5a71e522613a.pdfdepressurizationfree gas productionhuff-and-puff effectinjection modeoil reservoirs |
| spellingShingle | Jiang Ping Zhang Lei Ge Jijiang Zhang Guicai Yuan Yufeng Wang Yang Pei Haihua An Experimental Investigation of Feasibility of Gas Huff and Puff for Recovering Crude Oil with Different Viscosities Journal of Petroleum Science and Technology depressurization free gas production huff-and-puff effect injection mode oil reservoirs |
| title | An Experimental Investigation of Feasibility of Gas Huff and Puff for Recovering Crude Oil with Different Viscosities |
| title_full | An Experimental Investigation of Feasibility of Gas Huff and Puff for Recovering Crude Oil with Different Viscosities |
| title_fullStr | An Experimental Investigation of Feasibility of Gas Huff and Puff for Recovering Crude Oil with Different Viscosities |
| title_full_unstemmed | An Experimental Investigation of Feasibility of Gas Huff and Puff for Recovering Crude Oil with Different Viscosities |
| title_short | An Experimental Investigation of Feasibility of Gas Huff and Puff for Recovering Crude Oil with Different Viscosities |
| title_sort | experimental investigation of feasibility of gas huff and puff for recovering crude oil with different viscosities |
| topic | depressurization free gas production huff-and-puff effect injection mode oil reservoirs |
| url | https://jpst.ripi.ir/article_810_ae90ee9f023923005abb5a71e522613a.pdf |
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