Abstract:

The oilfield in South Yellow River Region is composed of complicated small fault block reservoirs.There is no energy complement during oil field exploration,oil recovery result is very poor.Single well waterflood swallowing spitting method could complement the formation energy,restore formation pressure and improve recovery efficiency.The single well waterflood swallowing spilling should be carried out by stages,each stage could be divided into waterflooding,closing in and oil recovery substages.The restoration of formation pressure is closely related to the amount and rate of water injection.The closing in of wells is to make the water injected replacing oil.The wettability and permeability of the reservoir are the main factors effecting the waterflood swallowing spitting.The high wettability index of the reservoir determines it strong wettability,strong oil expulsion and high recovery rate;its high permeability means shorter water injection time and higher oil recovery velocity.This method is now used in Ma Ⅱ-108 Well,the result is evidence.

Key words: single well waterflood swallowing spitting, water injection, closing in, recovery, no energy complement well, recovery ratio