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Optimization of refracturing timing for horizontal wells in tight oil reservoirs: A case study of Cretaceous Qingshankou Formation, Songliao Basin, NE China
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Jianchun GUO,Liang TAO,Fanhui ZENG
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Table 7 Optimization of temporary plugging and diversion stages for the treated well.
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| Stage number | Fracturing
section/m | Perforation
thickness/m | Perforation density/(shots?m-1) | Perforation shots | Refracturing method | Breakdown
pressure/MPa | Classification | Times of temporary plugging and diversion | | 1 | 1 945-2 015 | 30 | 10 | 300 | Inter-fracture treatment | 49.5 | 3 | 2 | | 2 | 1 803-1 825 | 21 | 10 | 210 | Existent fracture extension | 41.2 | 1 | | 3 | 1 703-1 775 | 70 | 10 | 700 | Inter-fracture treatment | 46.3 | 2 | | 4 | 1 652-1 682 | 30 | 10 | 300 | Existent fracture extension | 41.1 | 1 | | 5 | 1 540-1 625 | 30 | 10 | 300 | Existent fracture extension | 42.3 | 1 | | 6 | 1 460-1 525 | 65 | 10 | 650 | Inter-fracture treatment | 46.3 | 2 | | 7 | 1 364-1 463 | 30 | 10 | 300 | Existent fracture extension | 40.5 | 1 |
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