Studying The Advantage Channels Of Waterflooding Reservoir By Using Reservoir Engineering Methods

Water injection development method is the most widely used development method in oil field development.After long-term water injection development,reservoirs often form advantage channels.The formation of advantage channels has made the in-layer and interlayer conflicts in water drive reservoirs intensify,the area of water flooding in oilfields is greatly reduced and it has become difficult to increase recovery.Therefore,the identification and portrayal of the advantage channel is extremely important for the later overall development of the waterflooding reservoir and the remaining oil use.This paper identifies the seepage capacity of the near-wellbore region through well test interpretation results for waterflooding reservoirs,and qualitatively evaluates the development status of advantage channels.By establishing a set of medium and short-term inter-well tracer analysis techniques for water flooding turbulent reservoirs,characteristic parameters of interwell wells are obtained.Combining non-piston oil displacement theory and dynamic analysis methods,a multi-information comprehensive inversion advantage channel parameter method was established to achieve the quantification of the advantage channel dominant channel parameters.The main understandings of the research are as follows:(1)Well test interpretation and evaluation of near-wellbore seepage conditions explain the pressure-sensitive main control factors.It can give a qualitative judgment on the existence of advantage channel through the difference of internal and external zone permeability and the surrounding oil-water well dynamics.(2)Interwell Tracking Interpretation and Identification of Advantage Channel Methods by fitting the tracer yield curve,we obtained two dominant channels between C5 and C4 wells in Area D of A Oilfield.The thickness,permeability,and volume averages were 1.06 m,49266 mD,and 6822 m~3,respectively.(3)Through dynamic analysis methods and non-piston flooding theory,combined with multi-information comprehensive inversion software,hierarchical channels are characterized,displayed and quantified for different layers of advantage channels.