Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process
The shallow, thin super-heavy oil reservoir demonstrates certain characteristics, such as shallow reservoir depths, low-formation temperature, and high crude oil viscosity at reservoir temperatures. In the current production process, the central area of P601 is undergoing high-frequency huff and puf...
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MDPI AG
2024-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/17/23/6024 |
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| author | Chunyu Hu Jianqiang Tao Meng Feng Qian Wang Hui Cao Hongmei Su Junke Sun Wenfeng Wang |
| author_facet | Chunyu Hu Jianqiang Tao Meng Feng Qian Wang Hui Cao Hongmei Su Junke Sun Wenfeng Wang |
| author_sort | Chunyu Hu |
| collection | DOAJ |
| description | The shallow, thin super-heavy oil reservoir demonstrates certain characteristics, such as shallow reservoir depths, low-formation temperature, and high crude oil viscosity at reservoir temperatures. In the current production process, the central area of P601 is undergoing high-frequency huff and puff operations, facing certain problems such as decreasing production, low recovery rates, and rapid depletion of formation pressure. Through physical simulation experiments, the various elements of HDNS-enhanced oil recovery technology were analyzed. Nitrogen plus an oil-soluble viscosity reducer can improve the thermal recovery and development effect of super-heavy oil. With the addition of the viscosity-reducing slug, the recovery rate of steam flooding was 58.61%, which was 23.32% higher than that of pure steam flooding; after adding the 0.8 PV nitrogen slug, the recovery rate increased to 76.48%. With the increased nitrogen injection dosage, the water breakthrough time was extended, the water cut decreased, and the recovery rate increased. Nitrogen also plays a role in profile control and plugging within the reservoir; this function can effectively increase the heating range, increase steam sweep efficiency, and reduce water cut. So, the synergistic effects of steam, nitrogen, and viscosity-reducing agents are good. This technology enhances the development of shallow-layer heavy oil reservoirs, and subsequent development technologies are being compared and studied to ensure the sustainable development of super-heavy oil reservoirs. |
| format | Article |
| id | doaj-art-e4eee8e41ffe4fbaa28fbd5f9c27989d |
| institution | DOAJ |
| issn | 1996-1073 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-e4eee8e41ffe4fbaa28fbd5f9c27989d2025-08-20T02:50:37ZengMDPI AGEnergies1996-10732024-11-011723602410.3390/en17236024Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff ProcessChunyu Hu0Jianqiang Tao1Meng Feng2Qian Wang3Hui Cao4Hongmei Su5Junke Sun6Wenfeng Wang7Xinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, ChinaXinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, ChinaOil Test Company, Karamay 834000, ChinaResearch Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, ChinaExploration and Development Research Institute of Qinghai Oilfield Branch, China National Petroleum Corporation, Dunhuang 736202, ChinaXinjiang Uygur Autonomous Region Coalfield Geology Bureau 156 Coalfield Geological Exploration Team, Urumqi 830009, China1st Oil Plant of PetroChina Qinghai Oil Field Branch Company 816499, Dunhuang 736202, ChinaSchool of Geology and Mining Engineering, Xinjiang University, Urumqi 830017, ChinaThe shallow, thin super-heavy oil reservoir demonstrates certain characteristics, such as shallow reservoir depths, low-formation temperature, and high crude oil viscosity at reservoir temperatures. In the current production process, the central area of P601 is undergoing high-frequency huff and puff operations, facing certain problems such as decreasing production, low recovery rates, and rapid depletion of formation pressure. Through physical simulation experiments, the various elements of HDNS-enhanced oil recovery technology were analyzed. Nitrogen plus an oil-soluble viscosity reducer can improve the thermal recovery and development effect of super-heavy oil. With the addition of the viscosity-reducing slug, the recovery rate of steam flooding was 58.61%, which was 23.32% higher than that of pure steam flooding; after adding the 0.8 PV nitrogen slug, the recovery rate increased to 76.48%. With the increased nitrogen injection dosage, the water breakthrough time was extended, the water cut decreased, and the recovery rate increased. Nitrogen also plays a role in profile control and plugging within the reservoir; this function can effectively increase the heating range, increase steam sweep efficiency, and reduce water cut. So, the synergistic effects of steam, nitrogen, and viscosity-reducing agents are good. This technology enhances the development of shallow-layer heavy oil reservoirs, and subsequent development technologies are being compared and studied to ensure the sustainable development of super-heavy oil reservoirs.https://www.mdpi.com/1996-1073/17/23/6024super-heavy oil reservoirmulti-cycle huff and puffthe viscosity of heavy oils decreasesreservoir conversionenhanced oil recovery |
| spellingShingle | Chunyu Hu Jianqiang Tao Meng Feng Qian Wang Hui Cao Hongmei Su Junke Sun Wenfeng Wang Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process Energies super-heavy oil reservoir multi-cycle huff and puff the viscosity of heavy oils decreases reservoir conversion enhanced oil recovery |
| title | Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process |
| title_full | Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process |
| title_fullStr | Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process |
| title_full_unstemmed | Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process |
| title_short | Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process |
| title_sort | experimental study on enhanced oil recovery of shallow super heavy oil in the late stage of the multi cycle huff and puff process |
| topic | super-heavy oil reservoir multi-cycle huff and puff the viscosity of heavy oils decreases reservoir conversion enhanced oil recovery |
| url | https://www.mdpi.com/1996-1073/17/23/6024 |
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