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Soaking Time and Flowback System Optimization of Shale Oil Wells in Cangdong Sag
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Dong WANG1, Dong-xu TIAN2, *, Qing TANG1, Hong-lin ZHENG2, Rui CHEN1, Jian ZHU2, Miao-di WANG1
Science Technology and Engineering | 2025, 25(20) : 8463 - 8473
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Science Technology and Engineering | 2025, 25(20): 8463-8473
• Papers·Petroleum and Natural Gas Industry •
Soaking Time and Flowback System Optimization of Shale Oil Wells in Cangdong Sag
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Dong WANG1, Dong-xu TIAN2, *, Qing TANG1, Hong-lin ZHENG2, Rui CHEN1, Jian ZHU2, Miao-di WANG1
Affiliations
  • 1 PetroChina Dagang Oilfield Company, Tianjin 300280, China
  • 2 College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 101137, China
Published: 2025-07-18 doi: 10.12404/j.issn.1671-1815.2405391
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Addressing the lack of clarity regarding spontaneous imbibition displacement mechanisms and production management strategies for shale oil in the Cangdong Sag, a model was established that considered the “synergy of imbibition, flowback, and productivity”. The model was designed to dynamically reflect the mutual constraints and synergies between spontaneous imbibition displacement and engineering parameters such as flowback rates and soaking durations. Through comprehensive numerical simulations integrating geology and engineering across the entire lifecycle, the spontaneous imbibition displacement patterns and optimal flowback regimes for the C1 and C3 sweet spots in the Kong-2 Member, which served as the main development interval in the Cangdong Sag, were elucidated. The results indicate that spontaneous imbibition displacement continues to occur during the flowback process. The optimal soaking durations for the C1 and C3 sweet spots are determined to be between 37 and 42 days, with a reasonable flowback rate ranging from 20 to 40 tons per day. The research findings provide a theoretical foundation for studies on spontaneous imbibition mechanisms and reasonable production management strategies for deep shale oil and gas reservoirs.

Cangdong Sag  /  shale oil  /  integration of geology and engineering  /  fracturing  /  flowback system
Dong WANG, Dong-xu TIAN, Qing TANG, Hong-lin ZHENG, Rui CHEN, Jian ZHU, Miao-di WANG. Soaking Time and Flowback System Optimization of Shale Oil Wells in Cangdong Sag[J]. Science Technology and Engineering, 2025 , 25 (20) : 8463 -8473 . DOI: 10.12404/j.issn.1671-1815.2405391
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Year 2025 volume 25 Issue 20
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Article Info
doi: 10.12404/j.issn.1671-1815.2405391
  • Receive Date：2024-07-17
  • Online Date：2026-05-13
  • Published：2025-07-18
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  • Received：2024-07-17
  • Revised：2025-04-12
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Affiliations
    1 PetroChina Dagang Oilfield Company, Tianjin 300280, China
    2 College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 101137, China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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