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 difference of over 60 times. It has performed a miracle of keeping year of stable production of 357 million bbl for 27 years during its 49 years of development. Till the end of 2007, recovery factor had exceeded 50%. The developed oil production technologies have played important roles in keeping high and long-term stable production. However, water cut becomes extremely high (91 % on average) as a result. Technologies originally developed in low and medium water cut period may not suitable for extra-high water cut development period. There are contradictions between newly developed technology and traditional old technologies. This paper reviews production technologies development history of Daqing oilfield, such as separate layer water injection, separate layer allocation, water shutoff, profile chemical control, and separate layer frac technologies. The paper also discusses issues in the extra-high water cut period development. Copyright 2008, International Petrolieum Technology Confrence.