High-efficient Development of Low-permeability Reservoir with Geology and Engineering Integration:a Case Study of N25 Block in Dongying Sag
The development of the low-permeability hydrocarbon reservoirs in Dongying Sag,characterized with dispersed distribution,deep burial depth and low quality,face the prominent contradictions of injection failure and production failure,which lead to challenges for benefit development,such as low single-well productivity,rapid natural decline of production and low recovery efficiency,increasing the difficulty to efficiently utilization.Taking the N25-42A low-permeability turbidite sandstone reservoir of middle submember of Member 3 of Shahejie For-mation in Niuzhuang subsag as an example,the implementation of the geology-engineering integration develop-ment strategy with fine reservoir characterization,reservoir stimulation through complex fracture network fractu-ring,forward pressure-driven water injection,optimized design and construction of drilling and ground engineering as the core,improves the sweet spot detection accuracy,significantly shortens the drilling cycle,stimulates the for-mation of complex fracture network and swept volume,efficiently replenishes the formation energy,and promotes the displacement efficiency.Since the application of the geology and engineering integration development strate-gy,the N25-42A low-permeability reserves realizes less wells but high yields and sharp reduction of investment,with the average daily oil production and the estimated ultimate recovery of single well increases by 0.6 times and 6 times respectively.Practice has proved the application value and reference significance of the geology-engineer-ing integration development strategy in improving the utilizing rate of low-permeability reserves in fault basins,and promoting the capacity construction of lean reservoir.
low-permeability turbidite reservoirgeology-engineering integrationreservoir sweet spotspres-sure-driven water injectionbenefit developmentproduction construction
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