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YJ One-Way Shock Absorber
Application and benefit:
The YJ type one-way shock absorber (bumper) is used during drilling operation. It helps to absorb any shock and vibration originating from the drill string while drilling. The benefits of using the shock absorber are firstly, it helps to enhance service life of drill bit and drill tools, secondly, it improves drilling speed and efficiency, and finally, it aid in prevention against bit bounce in drilling operation.
Features:
simple structure,reliable working performance,easy operation and maintenance.
Working Principle
The hydraulic shock absorber is connected between the drill bit and drill collar. During drilling operation, the torque is transferred from top of drill string to the absorber’s mandrel. The spline will then transfer the torque through the spline outer barrel, oil cylinder and lower sub to drive and rotate the drill bit.
Weight on bit is the total amount of downward force exerted on the drill bit from the top of the drill string. Significant weight on bit is required for the drill bit insert to efficiently drill into the formation to break rocks into pieces. The drilling mud is fed through the bore of drill pipes and collars into the mandrel of shock absorber and finally ejected into the well bottom through the lower sub bore of the shock absorber.
During drilling, because of the uneven well bottom condition and structure of the cone bit, the different force components mentioned above are exerted on the drill bit and drill string resulting in severe vibration. The hydraulic shock absorber will thus absorb the vibrational energy by means of compressing and deforming the compressible fluid under pressure. The shock absorber can reduce the vibration and impact load on the drill tools.
Available model:
YJ46C YJ62C YJ70C YJ80C YJ94C
Specifications - YJ One-Way Shock Absorber
1 One-Way Shock Absorber YJ46C 121 38 100 250 1000 -40~150 NC38 3760 247
2 One-Way Shock Absorber YJ62C 160 47 120 343 1500 -40~150 NC46 4100 400
3 One-Way Shock Absorber YJ70C 178 57 120 392 1500 -40~150 NC50 3800 560
4 One-Way Shock Absorber YJ80C 203 64 150 450 2000 -40~150 6 5/8 REG 4100 740
5 One-Way Shock Absorber YJ94C 241 70 150 540 2000 -40~150 7 5/8 REG 3820 1100
