Page 624 - Air and Gas Drilling Manual

11-62 Air and Gas Drilling Manual
The inside diameter of the drill pipe body lumped geometry in this openhole section
is
d 7 3 826 inches
.
d 7
D 7
12
D 7 0 319 ft
.
The total length of the lumped drill pipe tool joints geometry increment, H 2, in
the cased section is
H 2 350 ft

The inside diameter of the drill pipe tool joints lumped geometry in this cased
section is

D 0 292 ft
.
6
The total length of the lumped drill pipe body geometry increment, H 1, in the
cased section is
,
H 1 6 650 ft
The inside diameter of the drill pipe body lumped geometry in this cased section is

.
D 7 0 319 ft
Inside the Drill String (10,000 ft to 7,000 ft)
The fifth drill string section increment is denoted by the length H 5. The
temperature at the bottom of the drill collars (bottomhole temperature) in the
openhole section is

T 604 41˚R
.
5
The average temperature of the drill collar length H 5 and, thus, the temperature of the
gas flow inside the drill collars is
T av5 601 91˚R
.
The inside surface of the drill collars has the surface roughness of commercial steel.
Therefore, over this drill collar length the surface roughness is
e p 0 00015 ft
.