Manual
Equipment for kelly drilling
Technical data
LRB
255
7
Kelly drilling
Drilling
d
riv
e I – t
orqu
e 1
st
g
ea
r
1
84,400 lb
f f
t
2
nd
g
ea
r
9
2,200 lb
f f
t
Drillin
g d
riv
e I – s
pee
d 1
st
g
ea
r
2
0rpm
2
nd
g
ea
r
4
0rpm
Max
. d
rillin
g d
iameter
wit
h a
dapte
r
9
.8 ft
Max
. d
rillin
g d
iameter
withou
t c
asin
g o
scillato
r
7
.2 ft
Max
. d
rillin
g d
iameter
wit
h c
asin
g o
scillato
r
5
.9 ft
Lin
e p
ul
l k
ell
y w
inc
h 4
5,000 lbs
Lin
e s
pee
d k
ell
y w
inc
h 0 –
295 ft/min
Transpor
t d
imensions
Working
d
imensions
Kell
y t
ype L Weight L
1
R Drillin
g d
epth
ft lbs ft ft ft
3/24 32.8 13,250 78.7 36.1 72.2
3/28 36.1 14,550 91.9 32.8 85.3
3/32 41.0 16,100 104.9 27.9 98.4
3/36 44.3 17,600 118.1 24.6 111.5
4/48 45.9 18,750 157.5 22.9 150.9
4/65 57.4 23,150 213.3 11.5 206.7