Page 345 - Air and Gas Drilling Manual

8-28 Air and Gas Drilling Manual
The total length of the lumped drill pipe body increment (first), H 1, in this
cased section of the annulus is
7 000 
H = 7 000 − 1 5 .  , 30 
,

1
H = 6 650 ft
,
1
The inside diameter of the casing along this length in this cased section of the
annulus is
d = 8 017 inches
.
1
d
D = 1
1
12
D = 0 668 ft
.
1
and the outside diameter of the drill pipe body along this length is
.
d 2 = 450 inches
d
D = 2
2
12
D = 0 375 ft
.
2
The individual tool joint length along the drill string is assumed to be
approximately 1.5 ft (30 ft drill pipe lengths). The total length of the lumped drill
pipe tool joint increment (second), H 2, in this cased section of the annulus is
7 000 
H = 15 .  ,
2  30 
H = 350 ft
2
The inside diameter of the casing along this length of the cased section of the
annulus is
D = 0 668 ft
.
1
and the outside diameter of the drill pipe tool joints along this length is

.
d 3 = 6 625 inches