Page 349 - Air and Gas Drilling Manual

8-32 Air and Gas Drilling Manual
T =
.
1
2
r
2
T =
T +
,
0 01 7 000)
.
r
2
T = T + 001 ( ( H + H )
o
574 41 R
.
2
The average temperature of this cased section length H 2 is
T + T
T = 1 2
av2
2
o
.
T = 572 66 R
av2
Since both surfaces in this annulus section are commercial steel, then the surface
roughness is
.
e p = 0 00015 ft
Therefore, Equation 6-58 becomes
  2
 
f a2 =   0 668 − 1 0 552   
114
2  log  . .  + .

   0 00015   
.
f = 0 021
.
a2
With the above values Equations 6-52 and 6-53 become, respectively
0 950  
 10    .
.
a a2 =  53 36    1 +  .  
2 635 
.
a a2 = 0 025
.
and
2 635)
.
.
b a2 = 0 021  53 36  2 (. 2
π
0 668 −
2 32 2) ( . 0 552  ) 10    2 [ 2 2 ] 2
(
.
.
.
0 552)
0 668)
 4  (. − (.