Dual directional treatment technology for oil and water wells to improve single well production in fully assembled ultra-low permeability and high-water content fractured reservoirs
The Chang 6 reservoir in Jing'an Oilfield is a highly developed,ultra-low permeability,high-water-saturation fractured reservoir.As the exploitation period extends,the reservoir has entered the mid-to-high water-cut phase,where existing technologies fall short of meeting the demands for efficient development.Therefore,there is an urgent need to innovate and develop an integrated technology system for maintaining stable production and improving recovery rates during the mid-to-high water-cut phase to efficiently utilize existing reserves.Based on the primary contradictions in reservoir development at this stage in Jing'an Oilfield's Chang 6 reservoir and grounded in an understanding of reservoir geology and production dynamics,this paper simulates and compares three different scenarios to analyze changes in the flow field under various measures.Additionally,numerical simulation methods are employed to optimize fracture parameters,specifically targeting water breakthrough wells and non-responsive wells for repeated fracture stimulation.The results indicate that the combination of water plugging and directional fracturing,coupled with repeated fracturing of non-responsive wells,establishes the most effective displacement system.Practical applications in the reservoir have demonstrated that this method doubles the near-wellbore sweep area of water-flooded wells,effectively mobilizing residual oil on both sides of the fractures,resulting in a daily production increase of 1.1 tons per well and a 3.8%improvement in recovery degree.This significantly enhances reservoir development performance and recovery rates,providing technical guidance for potential measures aimed at tapping into reserves during the mid-to-late stages of development for similar reservoirs.
Ultra-low permeabilityFractured reservoirMedium high-water contentDeep profile controlPlugging and fracturingRecovery rateReservoir geologyRepeated transformationSingle well productivity
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维普
