TX 75083-3836, U.S.A., fax +1-972-952-9435. AbstractAccording to the geologic characteristic and development, performance of ultra-low permeability reservoirs ， and oil-water distribution rules of reservoir, this paper puts forward the key points in improving the single well production of old oilfield-develop the "dead oil area", and forms supporting technologies of in-fissure divert fracturing which is suitable for ultra-low permeability reservoirs. The onsite experiments prove that the infissure divert fracturing technology can effectively improve old well production of ultra-low permeability reservoirs.

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