Method for extending the effective period of deep-water plugging measures for multi-stage filling of fractured water flooded oil wells
Regarding water plugging in low-permeability reservoirs,there is currently no technology available for reference abroad,and domestic technology is relatively conventional and lacks in-depth research,with no breakthroughs for many years.It has reference value for controlling water and increasing oil production in similar reservoirs and improving the effectiveness period of measures.A geological model for water plugging in fractured water flooded wells was established,clarifying the distribution characteristics of remaining oil and revealing the composition and scale of the water flooded fracture system.A high-dose cascade filling deep water plugging technology was proposed,which uses high displacement fracturing equipment to sequentially inject plugging agents into the deep part of the water flooded fracture,forming a cascade filling plugging barrier,forcing water injection to displace the seepage field,forming a bypass effect on the lateral side of the fracture,displacing the remaining oil in the low-pressure area on the lateral side of the fracture,and achieving the goal of increasing production in water flooded wells.A total of 145 wells have been applied on site,and compared with conventional water plugging,the daily oil production of a single well has increased from 0.5 tons increased to 1.32 tons/day,with a decrease in moisture content of 11.4%increased to 31.5 The effective period of the measures has been increased from 180 days to 651 days,and the effective rate of the measures has been increased from 60%to 80%,showing good precipitation and oil production effects.The successful application of this technology provides a new technical means for the treatment of fractured water flooded wells in the Triassic of Changqing and serves as a reference for similar oil reservoirs in China.The hierarchical filling proposed in this article has obvious advantages in water blocking effect,promoting the upgrading of water blocking technology.The next step will be to continuously optimize the process and improve its adaptability.
Low permeability oil reservoirEngineering technologyFractured flooded oil wellsCrack systemStep fillingDeep water pluggingBlocking barrierControlling water and increasing oil production
万方数据
维普
