Page 11 - Air and Gas Drilling Manual

xii List of Symbols
K Tee
= minor loss factor for the valves in the blooey line
K v
= length of a cubic foot of the compressed air in the drill collars prior to
L = minor loss flow resistance coefficient for the Tee
the stop, ft
l = length of the cylinder, ft
L anp = length of the annulus passage, ft
l anp = length of the annulus passage, in
L b = length of the blooey line, ft
L c = length of drill collars, ft
L d = nozzle depth along the periphery of the stator, ft
l d = nozzle depth along the periphery of the stator, in
ln = exponential logarithm
log = natural logarithm
L op = length of orifice passages, ft
l op = length of orifice passages, in
L p = length of drill pipe, ft
= length of piston passages, ft
L pp
l pp = length of piston passages, in
L sp = length of shank passage, ft
l sp = length of shank passage, in
L sp = length of the drive shaft passage, ft
l sp = length of the drive shaft passage, in
L sr = length of the surface return flow line, ft
L t = nozzle throat opening, ft
l t = nozzle throat opening, in
m = number of vanes
MOP = margin of overpull
m w = mole weight of gas, lb/lb-mole
N = drill string (drill bit) speed, rpm