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Research on the Influence of Pressure Drop on Injection-production System of Horizontal Wells

LI Yong;LIU Hui-qing;LIU Yong-ge;Key Lab. of Petroleum Engineering of Edncation Ministry,China Petroleum University(Beijing);Ocean Drilling Plant,Shengli Oil Field Branch Co.,China Oil Chemishry;  
According to mass conservation equation and theorem of momentum,the mathematical model of horizontal well with annulus and frictional resistance is built.According to oil-water two phase seepage theory,a reservoir model is built and coupled with the horizontal well model.Taking the actual parameters of a block in Shengli oil filed as reference,the reservoir with a horizontal injection well and a horizontal production well is built and different well patterns are simulated.The results show that the fluid production profile of the "toe to toe"pattern becomes more and more unbalance when the production goes on.On the contrary,the"toe to heel"pattern is helpful to balance the fluid production profile and increase oil recovery.
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