Calculate the wellhead pressure for the injection of 2000 bbl/d of water with a density of 1.05 g/cm3 and a viscosity of 1.1 cp in a 10000-ft vertical well. the well has a bottomhole pressure of 6000 psi and a 2-in., 3.4-lbm/ft tubing. the inner diameter of a 2-in., 3.4-lbm/ft tubing is 1.75 in., and the relative roughness is 0.005
Answers
Explanation:
Calculate the bottomhole pressure for the injection of 1500 bbl/d of brine with a density of 1.08 g/cm3 and a viscosity of 1.3 cp in an 8000-ft vertical well having a surface pressure of 200 psi and (a) 2-in., 3.4-lbm/ft tubing;
The Inner Diameter of a 2-in., 3.4-lbm/ft tubing is 1.751 in., and the relative roughness is 0.004
Hints
Use the following steps:
(a) Determine if the flow is laminar or turbulent by Reynolds number (Example 7-1)
(field Unit)
(b) Calculate the potential energy pressure drop (Example 7-2)
(c) Calculate the frictional pressure drop (verify why it is a turbulent flow by step a)
(d) Calculate the total pressure drop as Bottomhole pressure (BHP) = wellhead pressure (pwh) + potential pressure (Delta_Ppe) – frictional pressure drop (Delta_Pf) = anwer