压井液循环罐液面增加量为2.5m3时关井,立管压力pd为6MPa,套管压力pa为7MPa,原压井液密度ρm为1.20g/cm3;井径8 1/2in,井内5in钻杆,环空井眼容积Va为23.93L/m,垂直井深3000m。试求(1)井涌流体密度?并判断井涌流

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问题 压井液循环罐液面增加量为2.5m3时关井,立管压力pd为6MPa,套管压力pa为7MPa,原压井液密度ρm为1.20g/cm3;井径8 1/2in,井内5in钻杆,环空井眼容积Va为23.93L/m,垂直井深3000m。试求(1)井涌流体密度?并判断井涌流体为气体、盐水或油气水的混合物?(2)地层压力pp?地层压力当量密度ρe?

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答案(1)ρwm一[(pa一pd)÷(0.0098×△V÷Va)] =1.20一[(7—6)÷(0.0098×2500÷23.93)]=0.2232(g/cm3) 因为0.2232g/cm3<0.36g/cm3,故井涌流体为天然气。 (2)pp=pdmgH=6+0.0098×1.20×3000=41.28(MPa) ρe=pp/0.0098H=41.28/(0.0098×3000)=1.40(g/cm3) 答:井涌流体密度为0.2232g/cm3,故井涌流体为天然气;地层压力为41.28MPa,地层压力当量密度为1.40g/cm3

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