A low-permeability sandstone and mudstone thin interbedded reservoir in the western South China Sea exhibits strong heterogeneity,rapid production decline,high wellbore deviation,large perforation span,and poor waterflooding performance in some wells.Based on a detailed study of reservoir characteristics and current development status,through investigating the application conditions and effects of forward injection at the water well side in the Shengli Oilfield and reverse injection at the production well side in Daqing and Changqing Oilfields,we have formed the targeted reverse injection fracturing technology for offshore low-permeability thin interbedded reservoirs.This technology employs staged segmentation tools and composite temporary plugging techniques with ball sealers,large-scale reverse injection to enhance reservoir energy,efficient oil displacement agents for imbibition and displacement,reverse sequence mixing fracturing to reduce fracture initiation pressure,and optimized low-damage seawater-based fracturing fluid to ensure sand-carrying rheology and minimize reservoir damage.Large-scale sand fracturing effectively modifies the reservoir.Field applications have demonstrated the high reliability of this technology,with rapid oil production,extended stable production periods,and significant production increases.This effectively addresses the challenges of enhancing production in offshore deviated wells with large-span multi-stage continuous perforations,providing valuable insights for designing production enhancement schemes for similar oil and gas wells.
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