Case Histories of Production Technologies in Separate Zone Water Flooding in Daqing Oilfield

Daqing oil field is a giant, heterogeneous, multilayer sandstone oil field with 80-120 small layers, interlayer permeability<br>difference of over 60 times. It has performed a miracle of keeping year of stable production of 357 million bbl for 27 years<br>during its 49 years of development. Till the end of 2007, recovery factor had exceeded 50%. The developed oil production<br>technologies have played important roles in keeping high and long-term stable production.