SJ Double-way Shock Absorber
The SJ type two ways shock absorbers are used to simultaneously slow down or eliminate the vertical or horizontal shock from drill string. It can reduce the damage due to shocking to drill bit, drilling tool and surface drilling tool so as to enhance drilling speed and reduce drilling cost.
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Working Principle
The torsion of bottom hole will be changed with changes in bit structure, formation and bit weight. When the drilling speed reaches up to a certain value, torque and resonance will be happened to drill string. During rotation drilling, the lower part of drilling tool simultaneously bear axially pressure and torque. When bit weight exceed the limit value, the drilling tool will produce a transverse bending (it means lose steadiness) and torque can also make the drilling tool to lose steadiness to be turned into a twist shape.
Two positions are very typical:
1. The lower bit is suddenly frozen and then torque bumping will be produced unless the cut down rotary energy.
2. Reversing operation in force.
The vertically damping unit is made of mandrel, piston assembly, annular space damping unit and liquid spring of working chamber. Working mechanism: To absorb or release the vibration energy of bit and drill string by means of compressible liquid producing spring deformation in working chamber under the function of pressure. The mandrel moves axially relative to outer barrel when liquid spring is in compression or explanation. Meanwhile, the non-compressible liquid in damping chamber flows through damping space and produces a large number of friction heat so that some vibration and bumping energy are used up. The vertical bumping unit thus can absorb or reduce the drilling tools’ energy in vertical vibration and bumping.
The piston change-over unit is composed of spline outer barrel which is connected with piston by rectangular spline pair and the piston inner hole which is connected with mandrel by ladder-shaped spiral pair. Such a group unit can turn the torque vibration and impact load into vertical component of force in working chamber in a twinkling of an eye so that a constant torque is maintained on.
