Adaptability of joint water plugging of s-MPG and MSRG in fractured-vuggy reservoirs in Tahe Oilfield
The proven reserves of fractured-vuggy reservoirs in Tahe Oilfield are large， and the geological conditions featuring high temperature and high salt are more obvious than the sandstone reservoirs in the eastern area. The reservoir space is mainly developed in the forms of karst caves， fractures， dis...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Petroleum Geology and Recovery Efficiency
2025-07-01
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| Series: | Youqi dizhi yu caishoulu |
| Subjects: | |
| Online Access: | https://yqcs.publish.founderss.cn/thesisDetails#10.13673/j.pgre.202401047&lang=en |
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| Summary: | The proven reserves of fractured-vuggy reservoirs in Tahe Oilfield are large， and the geological conditions featuring high temperature and high salt are more obvious than the sandstone reservoirs in the eastern area. The reservoir space is mainly developed in the forms of karst caves， fractures， dissolved vugs， and so on. The combination relationship and the distribution pattern of different reservoir space in three-dimensional space are diverse， the flow law is complex， the heterogeneity is strong， the energy of edge and bottom water is high， and the distribution of remaining oil is various. It is difficult to enhance oil recovery. Based on the reservoir geological characteristics， a 3D visual model of a typical structure was designed and developed， and the multi-gel joint water plugging experiment was carried out to reveal the adaptability of gel water plugging in different fractured-vuggy reservoirs. The results show that after the gel joint water plugging in different reservoirs， the effects of controlling water and increasing oil are as follows： enhanced oil recoveries are 12% in fracture network reservoirs， 10% in crushed zone reservoirs， 8% in fractured-vuggy reservoirs， and 5% in karst cave reservoirs， respectively. In addition， the pilot application in the mine field was carried out based on the results of the laboratory experiment. After water plugging in the small-scale well with multiple karst caves， the water cut was reduced from 100% to 30%， and the cumulative oil production was increased by more than 1 000 tons. |
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| ISSN: | 1009-9603 |