High Rigidity Double-Way Shock Absorber Oil Well Drilling Tools Downhole Jarring Tool Two Way Shock Sub

• After-sales Service: 3 Years
• Warranty: 24moths
• Manufacturing Process: Forging
• Surface Treatment: Spray-Paint
• Operation Pressure: Atmospheric Pressure
• Material: Cast Steel
• Model NO.: SJ46B
• Transport Package: Wood Case or Stantdard Sea Packing
• Specification: O. D. 38-70MM
• Trademark: Tianhe
• Origin: China
• HS Code: 8431431000
• Production Capacity: 5000000PCS

Product Description

The SJ Type double-way shock absorber is used to dampen or eliminate both vertical and horizontal shock / vibration caused by the drill string. The primary benefit of shock absorption is that it helps to reduce damages to the drill bit and drilling tools, reduce drilling cost and enhance drilling efficiency.


Working principle
The torsion on the drill string at the bottom of the well bore changes with respect to the type of bit structure, ground formation and bit weight. During drilling operation, the lower portion of the drill tool needs to withstand both the axial pressure and torque. This causes the drill string to undergo both torque and resonance vibration when the drilling speed reaches a certain range of values. When weight on bit exceeds its critical value (buckling load limit), the drilling operation will normally be interrupted due to stick-slip or BHA whirl (backward     or forward).This is because the drilling tool will become unstable due to high transverse vibration (bending motion) and high torsional vibration (torsional motion, twist on the rod).

The vertical damping unit is made of mandrel, piston assembly, annular space damping unit and a fluid working chamber. In this mechanism, the compressible fluid in the working chamber acts as a spring to absorb or release the vibrational energy of the drill bit and drill string. For example, under pressure the fluid can   be compressed like a deformed spring. The mandrel moves axially relative to    the outer barrel when the fluid is in compression or expansion. Meanwhile the absorbed vibrational energy will be dissipated as the non-compressible fluid in the damping chamber flows through the damping space creating a great amount of heat and friction. Thus the vertical damping unit can absorb and reduce the lateral and vertical vibrational energy in the drilling tools.

The piston change-over assembly helps to maintain constant torque on the drill stem by instantly converting the torsional vibration and impact load into a vertical force component in the working chamber. The unit is composed of the spline outer barrel which is connected with the piston via a pair of rectangular spline and the piston inner surface is connected with mandrel by a pair of ladder-shaped spiral spline.

Specifications - SJ Double-Way Shock Absorber

Model	SJ46B	SJ62C	SJ64C	SJ70C	SJ80C	SJ90C	SJ94C
Product Code	1508000	1510000	1511000	1513000	1515000	1516000	1517000
O.D. (mm)	121	160	165	178	203	229	241
I.D. (mm)	38	47	47	57	64	71	71
Max.Stroke (mm)	110	120	120	100	120	120	120
Ambient Temperature (ºC )	-40~150	-40~150	-40~150	-40~150	-40~150	-40~150	-40~150
Max.Torque (kN.m)	10	15	15	15	20	20	20
Max.Bit Weight (kN)	200	340	340	400	480	540	540
Tensile Load (kN)	1000	1500	1500	1500	1960	1960	1960
Pull-Down Overall Length (mm)	4490	5193	5193	5620	5586	5460	5460
Connection	NC38	NC46	NC50	NC50	6 5/8 REG	7 5/8 REG	7 5/8 REG
Weight (kg)	320	550	600	700	1000	1300	1500

 

Detailed Photos

Certifications

Packaging & Shipping

 

Company Profile

Our Advantages

Tianhe principle is to offer high quality products at competitive price to benefit our customers and the industry in the long run.
We are the Leading manufacturer in China since 1973 for drilling /fishing /milling equipment for oil and gas.
We have established a complete quality control system, all products& equipments manufactured as per international standard and API standard.
Competitive Advantages
1. We offer high quality products at competitive price.
2. Shortest delivery time & Flexible payment terms.
3. Full range of drilling /fishing /milling equipment for oil and gas.
4. Timely after-sale service.
5. Imported International brands Machines such as Japan Mazak machining center, Austria WFL machining center etc
6. Complete quality control system, offices and testing equipment.
 

 

FAQ

Dear  customer,

Thanks for your time of visiting us on made in china, if you have any further questions and needs, please kindly inform us by inquiry online or contact us by below information.

We look forward to your kind reply, thanks very much.

Ms. Dongyan
Sales Manager

Tianhe Oil Group Huifeng Petroleum Equipment Co., Ltd.