Description

YJ One-Way Shock Absorber for Oilfield Drilling

Hydraulic Downhole Shock Absorber for Drill String Vibration Control, Bit Bounce Reduction, and BHA Protection

The SGPE YJ One-Way Shock Absorber helps oilfield drilling teams reduce axial shock, control drill string vibration, and protect the bottom hole assembly in oil and gas wells. The tool works between the drill bit and drill collar, where it cushions impact loads before they move upward through the drill string.

Many buyers also search for this product as a hydraulic drilling shock absorber, drill string shock absorber, downhole shock absorber, oilfield drilling bumper, drill stem shock absorber, drilling shock sub, or BHA shock absorber.

During oil and gas drilling, the drill bit often meets hard formations, uneven bottom-hole surfaces, changing weight on bit, and sudden impact loads. These conditions may damage the bit, reduce ROP, fatigue drill collars, and increase non-productive time. The SGPE YJ shock absorber helps control these problems through hydraulic oil compression and elastic deformation.

Contact SGPE for YJ One-Way Shock Absorber specifications, model selection, connection confirmation, and quotation support.

Product Overview

The YJ Type One-Way Shock Absorber supports petroleum drilling operations where bit stability, vibration control, and downhole tool protection matter. It helps reduce axial impact near the drill bit and keeps the drilling process smoother when the bit cuts hard, broken, or uneven formations.

SGPE supplies several models, including YJ46C, YJ62C, YJ70C, YJ80C, and Y94C. Each model has its own outer diameter, inner diameter, stroke, bit weight capacity, tensile strength, connection, overall length, and weight. Customers can choose the right model according to wellbore size, drill bit type, BHA design, connection requirement, drilling depth, and expected downhole load.

The tool uses a simple hydraulic structure and a stable torque transmission design. It offers reliable field performance, easy operation, and convenient maintenance for drilling contractors, oilfield service companies, petroleum equipment distributors, and oil and gas operators.

Why Shock Absorption Matters in Oil and Gas Wells

A drill bit does not always cut formation evenly. When the bottom of the well changes suddenly, the bit may bounce, strike the rock face, or transfer irregular loads to the drill string.

Without proper shock control, drilling teams may face:

Bit bounce and unstable cutting
Lower rate of penetration
Premature drill bit wear
Drill collar and tool joint fatigue
BHA vibration and impact damage
Higher risk of downhole tool failure
More trips and longer non-productive time
Higher drilling cost per meter

The SGPE YJ One-Way Shock Absorber cushions axial impact close to the bit. It also reduces vibration transmission through the BHA and drill string. As a result, the bit can stay in better contact with the formation, and the drilling system can run more smoothly.

Key Benefits of SGPE YJ One-Way Shock Absorber

Reduces Drill String Vibration

The tool absorbs impact energy near the drill bit and lowers shock loads on the drill string. It helps drilling teams improve stability in hard, broken, and high-vibration formations.

Helps Control Bit Bounce

Bit bounce can damage cutting structures and slow drilling progress. The YJ hydraulic shock absorber cushions sudden impact loads and helps the bit stay in better contact with the formation.

Protects the Bottom Hole Assembly

High vibration can fatigue drill collars, threaded connections, tool joints, and other drill stem components. The YJ shock absorber reduces impact transmission and helps protect the BHA from harmful vibration.

Extends Drill Bit and Tool Life

Continuous shock can shorten the service life of drill bits and downhole tools. SGPE YJ shock absorbers help reduce destructive loads, so drilling tools can work under more stable conditions.

Supports Better ROP

The tool does not create extra drilling power. However, it helps the bit use available weight and torque more efficiently. In suitable drilling conditions, this can support better ROP, fewer unnecessary trips, and lower operating cost.

Fits Demanding Oilfield Conditions

The tool suits hard formations, interbedded formations, deep wells, high-vibration wells, vertical wells, directional wells, roller cone bit drilling, and PDC bit drilling.

Makes Operation and Maintenance Easier

The YJ shock absorber uses a proven hydraulic structure. Its simple design supports reliable field operation and helps crews handle routine maintenance more easily.

Working Principle

Drilling teams connect the hydraulic shock absorber between the drill bit and drill collar.

During drilling, torque moves from the upper drill string to the absorber mandrel. The spline then transfers torque through the spline outer barrel, oil cylinder, and lower sub to drive the drill bit.

Weight on bit acts through the drill string and allows the bit inserts or cutting structure to penetrate the formation. At the same time, drilling mud flows through the drill pipe and drill collar into the mandrel of the shock absorber. Then it passes through the lower sub bore and reaches the bottom of the well. This mud flow cools the bit, cleans the hole, and carries cuttings.

When the bit meets uneven rock or a sudden formation change, strong vibration may occur. The YJ hydraulic shock absorber compresses and deforms the hydraulic oil under pressure. This process absorbs part of the vibration energy, cushions impact loads, and helps protect the drill bit, drill string, and BHA.

Main Oilfield Applications

SGPE YJ One-Way Shock Absorber suits many petroleum drilling conditions, including:

Oil well drilling
Gas well drilling
Onshore drilling projects
Offshore drilling projects
Deep oil and gas wells
Directional wells
Vertical wells
Hard formation drilling
Interbedded formation drilling
High-vibration drilling sections
Roller cone bit drilling
PDC bit drilling
BHA impact protection
Drill string vibration control
Bit bounce reduction
Drilling programs that require better ROP and longer tool life

This downhole shock absorber serves drilling contractors, oilfield service companies, oil and gas operators, drilling tool suppliers, petroleum equipment distributors, and project procurement teams that need reliable vibration control and drilling tool protection.

Product Features

Hydraulic Cushioning Structure

The tool uses hydraulic oil compression to absorb axial impact and reduce harmful vibration during drilling.

Stable Torque Transfer

The spline structure transfers torque smoothly from the drill string to the bit. This helps the bit maintain stable cutting action.

High Load Capacity

SGPE YJ shock absorbers provide strong bit weight capacity and tensile strength for medium-depth, deep, and demanding petroleum wells.

Wide Temperature Range

The tool operates under ambient temperatures from -40°C to 150°C, which makes it suitable for many oilfield environments.

Multiple Model Options

SGPE offers models with outer diameters from 121 mm to 241 mm, so customers can match the tool with different wellbore sizes and BHA designs.

Reliable Field Performance

The product combines a simple structure, strong mechanical performance, and easy maintenance. It helps reduce downtime and supports dependable drilling operations.

Technical Specifications

Model	YJ46C	YJ62C	YJ70C	YJ80C	Y94C
O.D. mm	121	160	178	203	241
I.D. mm	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

Need help choosing the right model?
Send SGPE your wellbore size, drill bit type, BHA design, connection requirement, expected weight on bit, formation condition, drilling depth, and required quantity. Our team will help recommend a suitable YJ shock absorber model.

Model Selection Guide

Choosing the correct YJ One-Way Shock Absorber depends on the drilling program and downhole condition. Key selection factors include:

Wellbore size
Drill bit type and size
Drill collar size
Bottom hole assembly design
Formation hardness
Expected vibration level
Weight on bit
Tensile load
Connection type
Drilling depth
Operating temperature
Required quantity and delivery schedule

For smaller drilling assemblies, YJ46C can fit many projects. For larger wellbores and heavier drilling loads, customers often consider YJ70C, YJ80C, or Y94C. For high-load drilling conditions, SGPE recommends a model with higher bit weight capacity and tensile strength.

Some project documents may write the large-size model as YJ94C. If your drawing or tender document uses this name, contact SGPE for model confirmation before ordering.

Why Choose SGPE

SGPE supplies oilfield drilling tools and petroleum machinery for global oil and gas projects. Our product range includes YJ One-Way Shock Absorber, drilling jars, shock subs, stabilizers, fishing tools, drill collars, and drill stem tools.

SGPE helps customers with product selection, connection confirmation, technical communication, and quotation service. We focus on stable product quality, machining accuracy, assembly control, and inspection before delivery.

SGPE Advantages

Multiple YJ shock absorber models available
Support for NC and REG connection requirements
Model selection support based on drilling parameters
Practical solutions for drilling contractors and oilfield service companies
Stable supply for petroleum equipment distributors
Clear communication for project procurement teams
Inspection-focused manufacturing and delivery process
Support for technical specifications and quotation documents

SGPE helps customers choose dependable downhole tools for vibration control, BHA protection, drilling efficiency, and long-term oilfield operation.

Related Oilfield Drilling Tools

SGPE can also supply other drilling tools and downhole equipment for petroleum operations, including:

Drilling jars
Shock subs
Stabilizers
Fishing tools
Drill collars
Drill stem tools
Downhole drilling tools
Oilfield drilling accessories

For complete drilling tool solutions, contact SGPE with your project requirements.

FAQ About Hydraulic Downhole Shock Absorber

1. What is a YJ One-Way Shock Absorber?

A YJ One-Way Shock Absorber is a hydraulic downhole tool for oil and gas drilling. It helps absorb axial shock, reduce drill string vibration, and protect the bottom hole assembly during drilling.

Many customers also call it a hydraulic drilling shock absorber, drill string shock absorber, downhole shock absorber, oilfield drilling bumper, drill stem shock absorber, drilling shock sub, or BHA shock absorber. SGPE supplies this tool for drilling contractors, oilfield service companies, petroleum equipment distributors, and oil and gas operators.

2. What does the YJ One-Way Shock Absorber do in oilfield drilling?

The YJ One-Way Shock Absorber helps control shock and vibration from the drill bit and drill string. During drilling, hard formations, uneven bottom-hole conditions, and changing weight on bit can create strong impact loads.

This tool cushions those loads and helps the drill bit maintain better contact with the formation. As a result, it supports smoother drilling, better BHA protection, longer drill bit life, and improved drilling efficiency.

3. Where do drilling crews install the YJ hydraulic shock absorber?

Drilling crews usually install the YJ hydraulic shock absorber between the drill bit and drill collar as part of the bottom hole assembly.

This position allows the tool to absorb impact near the drill bit before vibration travels through the drill string. It helps protect the bit, drill collars, threaded connections, and other downhole drilling tools.

4. How does the hydraulic downhole shock absorber work?

The YJ shock absorber uses hydraulic oil compression and elastic deformation to cushion impact energy. When the drill bit meets uneven rock or a sudden formation change, the tool compresses the hydraulic oil under pressure.

This process absorbs part of the vibration energy and reduces axial impact. At the same time, the spline structure transfers torque from the drill string to the drill bit, so the bit can continue cutting the formation.

5. How does this tool help reduce drill string vibration?

Drill string vibration often starts at the bit and then moves upward through the BHA and drill string. If vibration becomes too strong, it can damage drill bits, drill collars, tool joints, and downhole tools.

The SGPE YJ One-Way Shock Absorber lowers shock loads near the bit. It helps reduce harmful vibration transmission and keeps the drilling system more stable in hard, broken, or interbedded formations.

6. Can the YJ shock absorber help control bit bounce?

Yes. Bit bounce happens when the drill bit loses stable contact with the bottom of the well. It can damage cutting structures, slow penetration, and create unstable drilling performance.

The YJ shock absorber cushions sudden impact loads and helps the bit stay in better contact with the formation. This makes it a practical bit bounce reduction tool for oil well drilling, gas well drilling, roller cone bit drilling, and PDC bit drilling.

7. Can this hydraulic drilling shock absorber improve ROP?

Yes, it can support better ROP in suitable drilling conditions. The tool does not create extra drilling power, but it helps the bit use available weight and torque more efficiently.

When the bit runs more steadily, it can cut the formation with less energy loss. This may help improve drilling speed, reduce unnecessary trips, and lower drilling cost per meter in demanding oilfield applications.

8. What drilling conditions suit the YJ One-Way Shock Absorber?

The YJ One-Way Shock Absorber works well in petroleum drilling environments where shock and vibration affect drilling performance.

Typical applications include oil well drilling, gas well drilling, onshore drilling projects, offshore drilling projects, deep oil and gas wells, directional wells, vertical wells, hard formation drilling, interbedded formation drilling, high-vibration drilling sections, BHA impact protection, and drill string vibration control.

It is especially useful when drilling teams need better bit stability, longer tool life, and smoother bottom-hole operation.

9. Can SGPE YJ shock absorbers work with PDC bits and roller cone bits?

Yes. SGPE YJ shock absorbers can work with both PDC bits and roller cone bits, depending on the drilling program and BHA design.

For roller cone bit drilling, the tool helps reduce impact from uneven bottom-hole contact. For PDC bit drilling, it helps control harmful vibration and supports more stable cutting. Customers should confirm the final model according to bit size, wellbore size, connection type, weight on bit, and formation condition.

10. How do I choose the right YJ One-Way Shock Absorber model?

You should choose the model according to actual drilling conditions. Important selection factors include wellbore size, drill bit type, drill collar size, BHA design, connection type, expected weight on bit, tensile load, formation hardness, drilling depth, operating temperature, and vibration level.

For smaller drilling assemblies, YJ46C may fit the project. For larger wellbores and heavier drilling loads, customers often consider YJ70C, YJ80C, or Y94C. SGPE can review your drilling parameters and recommend a suitable hydraulic downhole shock absorber.

11. What models and technical specifications does SGPE supply?

SGPE supplies several YJ One-Way Shock Absorber models, including YJ46C, YJ62C, YJ70C, YJ80C, and Y94C.

These models cover outer diameters from 121 mm to 241 mm. The maximum stroke ranges from 100 mm to 150 mm, and the maximum bit weight ranges from 250 kN to 540 kN. Available connections include NC38, NC46, NC50, 6 5/8 REG, and 7 5/8 REG.

The tool works under an ambient temperature range of -40°C to 150°C, which makes it suitable for many oilfield drilling environments.

12. What information should I provide to get a quotation from SGPE?

To help SGPE recommend the right YJ One-Way Shock Absorber and prepare an accurate quotation, please provide the required model if known, wellbore size, drill bit type and size, BHA design, drill collar size, connection requirement, expected weight on bit, formation condition, drilling depth, working temperature, quantity, and delivery destination.

SGPE can provide product specifications, model selection support, connection confirmation, quotation, and delivery information for oil and gas drilling projects.

Inquiry Call to Action

Looking for a reliable YJ One-Way Shock Absorber supplier for oil and gas drilling?

Contact SGPE today for technical specifications, model selection support, connection confirmation, quotation, and delivery details.

Our team can help you choose the right hydraulic drilling shock absorber according to your wellbore size, drill bit type, BHA design, bit weight, and downhole conditions.

E-Mail:
info@sgpe.com

YJ One Way Shock Absorber