GLOSSARY

Page tree

Versions Compared

Old Version 22

changes.mady.by.user Arthur Aslanyan (Nafta College)

Saved on

compared with

New Version 23

changes.mady.by.user Arthur Aslanyan (Nafta College)

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...


The along-hole variation Darcy friction factor is usually not exceeding 10 % but the contribution of the friction-based  pressure loss  to the gravity-based pressure build up in vertical and slanted wells is very minor (few percents only) which makes constant friction factor assumption become quite relevant.


The absolute value is staying between 

LaTeX Math Inline
bodyf = 0.04
 for the very small flow rates (< 100 cmd) and 
LaTeX Math Inline
bodyf = 0.015
 for the very high flow rates  (> 1,000 cmd) and this should be taken into account in calculations. 

For complex well designs with varying pipe flow diameters and water source/stocks which may lead to substantial variation of flowrate the wellbore model can be split in segments each having a constant friction factor.

...