《Table 7.Optimization of temporary plugging and diversion stages for the treated well.》

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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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To verify the method for optimizing the refracturing timing of horizontal wells，the preceding study results were applied to some horizontal wells in the same block to optimize the refracturing method，refracturing timing，and times of temporary plugging reorientation.The treated well has a 650 m long horizontal section and a 480 m long oil-bearing sandstone zone.Its initial fracturing was a small-scale job with four clusters.The inter-fracture treatment and preexisting fracture extension methods were selected.Three new clusters were created and four preexisting clusters were extended，which made a total of seven clusters.The well was stimulated using the singlepacker commingled volume fracturing method，and the plugging agent was a water-soluble temporary plugging agent.According to the breakdown pressure at the perforations of the horizontal well，the well was divided into two stages，and two times of temporary plugging and diversion were performed（Table 7）.Based on the number of perforation shots，the dosage of temporary plugging agent was worked out.In the four layers of the first stage，1 110 perforation shots used17.3 kg of temporary plugging agent.In the two layers of the second stage，1 350 perforation shots used 21.1 kg of temporary plugging agent.