Abstract: For reservoirs with super-low permeability and high-angle fractures, the gross water cut increases quickly and some wells are suddenly water-flooded in the early phase of development. A series of water shutoff measures carried out in this phase do obtain obvious effectiveness, but with the increasing of water shutoff rounds, the effect is getting worse gradually. Field test shows that to prolong well shutdown time after water shutoff, the effect may be improved clearly for the reason of changing the flow direction allows to redistribute oil-water flowing system by full infiltration and exchange between matrix and fractures. This paper presents fine description of the reservoir in Huoshaoshan field and analysis of previous stimulations and effects, and proposes the fluid diversion technology for such a fractured reservoir by water shutoff and well shutdown. A great deal of field tests indicates its remarkably oil-incremental effects, providing precious experiences for post phase of development and stable production for such a reservoir.

Key words: Junggar basin, Huoshaoshan field, fractured reservoir, low permeability, water shutoff, well shutdown, EOR