Hydraulic Shock Absorber YJ

Product Detail

Hydraulic Shock Absorber YJ

Technical Features

Model “YJ” Hydraulic Shock Sub should be mounted on the drilling string near the bit, absorbing or reducing axial vibration and thrust load of the drilling string. And it has a good results for prolonging the service life of the bit and protecting the drilling tools and the surface equipment.

Working principle

The hydraulic shock absorber is connected between drill bit and drill collar, the torque is transferred from top drill string to mandrel. The spline transfers torque to spline outer barrel, oil cylinder and lower sub , then drive drill bit to rotate.

The bit weight is from the which of top drill tool so that drill bit insert drill into formation to break rock into pieces. The drilling mud is fed through bore of drill pipe and drill collar into mandrel of shock absorber, tailpipe, lower sub bore and ejected into bottom well .Because of the uneven bottom well conditions and special structure of cone bit, the drill bit and drill string during drilling operation would produce severe vibration. The hydraulic shock absorber, by means of compressible deformation of compressed liquid under the function of pressure, absorb the energy from drill bit and drill string vibration. Thus, the shock absorber can reduce the vibration and impact load of drill tools.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Technical parameters

Model	O.D mm/in	I.D mm/in	Connection API	Max.Working load kN/lbf	Yield Pull kN/lbf	Max.Working Torque kN·m/lbf·ft	Yield Torque kN·m/lbf·ft	Max.Working pressure kN/lbf	Working Stroke mm/in	Overall Length Mm/in
YJ95	96 3-3/4	38 1-1/2	NC26	400 90000	530 120000	8 5900	10 7400	120 26000	100 3.9	2880 113.3
YJ121	121 4-3/4	38 1-1/2	NC38	1500 340000	2200 490000	15 11000	50 36000	265 60000	100 3.9	4116 162
YJ165	165 6-1/2	50 2	NC50	2000 450000	2700 600000	35 25800	95 70000	390 87000	125 4.9	4070 160
YJ203	203 8	68 2-11/16	6 5/8REG	2000 450000	2700 600000	35 25800	95 70000	490 110000	140 5.5	4040 159
YJ254	254 10	71.4 2-13/16	8 5/8REG	3000 670000	5000 1120000	55 40000	200 147000	600 130000	140 5.5	4100 161
YJ356	356 14	76 3	8 5/8REG	8000 1800000	19000 4270000	150 110000	1000 740000	600 130000	150 5.9	4000 157.4

 Above list some models, other models also can be supplied as follows:YJ178(7"),YJ229(9"),YJ279(11"),YJ305(12").

 Also provide Mechanical-Hydraulic shock absorbers type DHJ.