The Hydraulic Shock Sub type YJ is fully hydraulic and is used for reducing vibrations caused by hard formation drilling and keeping the drill bit firmly on the bottom, so that it helps to reduce drill string connection fatigue and prolong drill string life.
|
Type
|
O.D.
mm
(in.)
|
Water
Hole
mm
(in.)
|
Max. Working
Stroke
mm
(in.)
|
Connection
API
|
Working
Temperature
0C
|
Max. Drilling
Pressure
kN
(Lbf)
|
Max. Tensile
Load
kN
(Lbf)
|
Max. Working
Torque
kN· m
(Lbf· m)
|
|
YJ121
|
121
(4 3/4)
|
38
(1 1/2)
|
100
(3 15/16)
|
3 1/2REG
|
-40～+150
|
260
(58500)
|
980
(220500)
|
10
(2250)
|
|
YJ178Ⅲ
|
178
(7)
|
57
(2 1/4)
|
125
(4 15/16)
|
NC50
|
-40～+150
|
390
(87750)
|
1470
(330750)
|
14.7
(3307.5)
|
|
YJ203Ⅲ
|
203
(8)
|
68
(211/16)
|
140
(5 1/2)
|
6 5/8REG
|
-40～+150
|
490
(110250)
|
1960
(441000)
|
19.6
(4410)
|
|
YJ229Ⅲ
|
229
(9)
|
70
(2 3/4)
|
140
(5 1/2)
|
7 5/8REG
|
-40～+150
|
540
(121500)
|
1960
(441000)
|
19.6
(4410)
|