Darcy friction factor
for wellbore flow can be written as:| LaTeX Math Block |
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{\rm Re}(l) = \frac{u(l) \cdot d}{\nu(l)} = \frac{4 \rho_s q_s}{\pi d} \frac{1}{\mu(T, p)} |
The along-hole variation of Darcy friction factor
is due to the influence of pressure and temperature variations on the fluid viscosity | LaTeX Math Inline |
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| body | \--uriencoded--\displaystyle %7B\rm Re%7D = \frac%7Bu(l) \cdot d%7D%7B\nu(l)%7D = \frac%7B4 \rho_s q_s%7D%7B\pi d%7D \frac%7B1%7D%7B\mu(T, p)%7D |
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.For water flow it is usually not exceeding 10 The along-hole variation of Darcy friction factor
is usually not exceeding 2-3 % and in many practical applications can be considered as constant along hole
.
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