Application and cognition of the in-depth profile modifica-tion and flooding technology in ultra-high water cut period of medium and low permeability reservoir
According to G6 block,a typical ultra-high water cut reservoir in Jiangsu oilfield,combined with the current development status and the characteristics of medium-low permeability reservoir,the field test of the in-depth profile modification and flooding was carried out by using dispersed phase plugging agent.The pro-cess of flooding was optimized from the process parameters such as injection particle size,injection concentra-tion and injection volume.Two well groups were applied in the field.Results showed that due to the formation of high permeability bands and large pores in long-term water flooding,the size selection of flexible particle modulator should not depend on the original pore throat size,but should be adjusted in time according to injec-tion pressure and well response during the process of flood modulator,and the addition of super-large particles or continuous phase high-strength plugging agent should be diverted to the slug to block the high-permeability water channeling channel.In scheme design,it is necessary to establish the concept of integral flooding con-trol,which can effectively avoid the interference among water injection wells.To achieve the purpose of ex-panding the overall sweep volume,the overall precipitation increase oil.
ultra-high water cut periodmedium-low permeability reservoirin-depth profile modification and flooding technologydispersed modification and flooding agent
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