API Standard Downhole Tool Sj Type Double-Way Shock Absorber for Oilfield

• After-sales Service: on Line Support
• Warranty: 1 Year
• Certification: ISO 9001:2008, API Certificate
• Power Source: Hydraulic
• Operation Pressure: Vacuum
• Applicable Medium: Water, Crude Oil
• Model NO.: SJ
• Structure: Plug-In
• Material: Carbon Steel
• Use: Well Drilling
• Application: Energy & Mining
• Transport Package: Wooden Case
• Specification: as per requirement
• Trademark: Wise Channel
• Origin: Jiangsu China
• HS Code: 84304900
• Production Capacity: 10000units Per Year

Product Description

About SJ Double-Way Shock Absorber

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

 

 

 Detail Photoes- SJ Double-Way Shock Absorber



 

 Q:How can I place order? 
A: You can contact us by email or social media like WhatsApp on the order detail or place order on line. 

Q:How about the payment?
A: For new clients, advance payment(30%-100% of total amount) is required, the balance need to be paid before the delivery after your inspection.

Q:How can I pay you?
A: By T/T (Telegraphic Transfer) or L/C (Letter of Credit). After you receive the PI, you can make the payment through your bank as per the terms mentioned in PI.

Q: What's the order procedure? 
A: First we discuss order details, production details by email ,TM or other social media; then we issue you an PI for your confirmation. You will be requested to make full payment or deposit before we go into production.After we get the deposit, we start to process the order. Depending on the products you order, we usually a couple of days or even moths to complete production if we don't have the items in stock. Before production has been finished, we will contact you for shipment details, and the balance payment. After payment has been settled, we shall arrange the shipment for you. 

Q: How do you deal with  defective products received by the clients? 
A:  If there are some defective items, we usually credit to our customer or replace them in next shipment.