| Customization: | Available |
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| Customized: | Customized |
| Certification: | ISO, API |
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About Yj One-Way Shock Absorber
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.
The one-way shock absorber effectively absorbs and reduces shock and vibration in the drill stem by means of elastic deformation of the hydraulic oil under external force. Its main advantages are its simple structure, its reliable working performance and its ease of 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.
| Model | YJ46C | YJ62C | YJ70C | YJ80C | Y94C | ||
| Product Code | 1408000 | 1410000 | 1413000 | 1415000 | 1417000 | ||
| O.D. (mm) | 121 | 160 | 178 | 203 | 241 | ||
| I.D. | 38 | 47 | 57 | 64 | 70 | ||
| Max.Stroke (mm) | 100 | 120 | 120 | 150 | 150 | ||
| Max.Bit Weight (kN) | 250 | 343 | 392 | 450 | 540 | ||
| Tensile Strength (kN) | 1000 | 1500 | 1500 | 2000 | 2000 | ||
| Ambient Temperature (°C) | -40~150 | -40~150 | -40~150 | -40~150 | -40~150 | ||
| Connection | NC38 | NC46 | NC50 | 6 5/8 REG | 7 5/8 REG | ||
| Pull-down Overall Length (mm) | 3760 | 4100 | 3800 | 4100 | 3820 | ||
| Weight (kg) | 247 | 400 | 560 | 740 | 1100 | ||
Established in 1973 as a state-owned Mudanjiang Petroleum Machinery Factory. After 50 years a new private company(Tianhe) was registered and established in 2006. At present, Tianhe Group has 5 sales companies, including Chengdu, Beijing, Shanghai, Yanan, Mudanjiang branches. 2 large factories, in cluding Mudanjiang and Shanghai factory, controlling the important sales territories in China. The company is also actively expanding its business overseas. Currently, more than 50 countries and regions around the world, as well as over 200 well-known oil companies and service company customers, are using products under the Tianhe brand. Tianhe has become one of the most popular Asian oil brands.
1.The company has over 50 years of professional production experience and is capable of independently manufacturing a complete range of downhole tools, including: drill pipes, drill collars, stabilizers, jars, fishing tools, etc.
2. We have a strict quality control system, conducting strict quality checks from raw materials to finished products.
3.The company has obtained ISO9001 quality system certification and holds API certificates such as 5CT, 5DP, 7-1, Q1, etc.
4.The minimum order quantity is 1, and the delivery cycle can be strictly controlled.
5.Our export products have been recognized by customers in more than 50 countries and regions.
1.Q:Are you a factory or trading company?
We are a factory and the Top 3 of oildrilling equipment manufacturer.
2.Q:Where is your factory located?
We locate in Heilongjiang Province, China.
3. Q:What do your factory do regarding quality control?
From material to products, we inspect each process to keep good quality.
And SGS inspection can be accepted.
4.Q:How about MOQ ?
We have stock of common sizes at hand, so even few ton is accepted.
5.Q:How about payment ?
Both T/T and L/C can be accepted.
6.Q: How long does your warranty?
We can assured the quality within 90 days after receiving the cargoes.
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