Numerical simulation of blind pipe water control mechanism in double-layer commingled production oil wells
Based on the pilot development test program of blind pipe water control in Shengli Oilfield,the blind pipe water control model of double-layer commingled production oil wells was established according to the dynamic characteristics of oil and water inflow in double-layer commingled production oil wells.The numerical simulation of formation produced fluid characteristics of double-layer commingled production oil wells under different lengths and positions of blind pipes was studied by Fluent software.The research results show that blind pipes could increase the flowing bottom-hole pressure of high watercut reservoir and reduce the formation produced fluid flow rate.For double-layer commingled production oil wells with watercut of 80％,the length of the blind pipe is the primary factor affecting its water control effect.The longer the blind pipe,the more obvious the water control effect.Compared with wells without blind pipes,placing the blind pipe in the entire section of the 2 m high watercut reservoir could reduce the watercut of produced fluid by 30％.The position of the blind pipe is the secondary factor affecting its water control effect.Placing 0.5 m blind pipe at varying positions of the 2 m high watercut reservoir decreased the watercut of produced fluid by about 3％.To ensure the water control effect,a blind pipe suitable for the formation thickness should be placed in the high watercut reservoir according to the reservoir position to regulate the volume of produced fluid flow rate of double-layer commingled production oil wells and achieve the purpose of water control.On the basis of optimizing the length and position of blind pipe in double-layer commingled production oil wells,the water control mechanism of blind pipe-was studied by flow numerical simulation.The research results could provide technical guidance for blind pipe water control production of double-layer or multi-layer commingled production oil wells in high watercut oil reservoirs.
multi-layer commingled productionblind pipeflow regulation and water controlnumerical simulation
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NSTL
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