Hydraulic Shock Absorber 

Introduction

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.

Common size OD:4-3/4",6-1/2",8",11",14".we also provide Mechanical-Hydraulic shock tools