Description
QJZ Mechanical Drilling Jar
Mechanical Drilling Jar for Stuck Pipe Recovery and Drill Stem Jarring
The SGPE QJZ Mechanical Drilling Jar is a fully mechanical downhole tool designed for oil and gas drilling. It provides up jarring and down jarring in one tool body, helping rig crews free stuck drill string components, restore drill stem movement, and reduce downtime at the wellsite.
The jar is installed as part of the drill string. When the applied pull or push load reaches the preset jar trip load, the mechanical trip system releases a strong impact force. The trip sleeve and friction sleeve work together to trigger the jarring action quickly, giving crews a practical way to respond when downhole sticking occurs.
SGPE supplies a full QJZ series, including QJZ95, QJZ108, QJZ121, QJZ159, QJZ165, QJZ178, QJZ203, and QJZ229. These models support different well depths, hole sizes, drill string designs, connection requirements, and bottom hole assembly configurations.
Product Overview
Stuck pipe can stop drilling progress and increase rig cost quickly. Differential sticking, keyseats, tight hole sections, cuttings buildup, sand bridges, unstable formations, and poor hole cleaning may all restrict drill string movement. When this happens, the crew needs controlled impact force to loosen the stuck point and recover the drilling assembly.
The QJZ Mechanical Drilling Jar delivers that force through a reliable mechanical release system. Operators can activate the tool by pulling upward or applying downward load to the drill string.
Once the load reaches the required setting, the internal spring unit deforms, the trip sleeve engages the friction sleeve, and the mandrel releases suddenly. This movement creates a sharp jarring impact that travels through the drill stem and acts on the stuck section.
Because the QJZ jar works mechanically, it offers quick response, simple operation, and dependable performance in demanding downhole conditions. Drilling contractors, oilfield service companies, petroleum equipment suppliers, and well engineering teams can use it for stuck pipe recovery, BHA release, fishing operations, drill stem jarring, and downhole tool recovery.
Key Features
Fully Mechanical Trip System
The QJZ drilling jar uses a mechanical trip sleeve and friction sleeve system. This direct structure helps the tool release impact force quickly when the load reaches the preset trip value. It also gives rig crews a practical jarring solution without relying on hydraulic delay timing.
Up and Down Jarring in One Tool
The tool delivers impact in both directions. Operators can pull the drill string to create upward impact or apply downward load to create downward impact. This dual-direction design gives the crew more flexibility when downhole conditions change.
Fast Impact Response
The jar releases force as soon as the trip load reaches the required value. Quick response helps crews act early, reduce non-productive time, and improve the chance of freeing stuck drill pipe, drill collars, or bottom hole assemblies.
Support for Stuck Pipe and Fishing Operations
The QJZ series helps loosen stuck drill string components, jammed assemblies, and downhole tools. It performs well in common oilfield conditions such as differential sticking, tight hole, keyseat sticking, poor hole cleaning, fishing operations, and BHA release.
High Strength Tool Body
SGPE designs the QJZ series for high tension load, working torque, and repeated jarring impact. The range covers outside diameters from 95 mm to 229 mm and maximum tension loads from 600 kN to 3000 kN, giving customers more choices for different drilling programs.
Common Oilfield Connections
Available connections include NC26, NC31, NC38, NC46, NC50, 6 5/8 REG, and 7 5/8 REG. These connection options help customers match the jar with drill pipes, drill collars, and bottom hole assemblies used in oil and gas wells.
Working Principle
The QJZ mechanical drilling jar creates impact through a mechanical release system. Its main working parts include the mandrel, trip sleeve, friction sleeve, internal spring unit, spring sleeve, slips, and connection sections.
During normal drilling, the jar stays in the drill string and carries drilling load and torque. When the operator applies enough upward or downward force, the internal mechanism reaches the preset trip load. The tool then releases stored energy and creates a strong jarring action.
This impact helps break resistance at the stuck point and allows the drill string, BHA, fishing tool, or other downhole component to move again.
Up Jarring Operation
Up jarring starts when the operator pulls the drill string upward. As the pull load increases, the internal spring unit begins to deform. When the load reaches the preset jar trip load, the trip sleeve engages the friction sleeve. The mandrel then releases suddenly and creates a strong upward impact.
This upward force travels through the drill string and acts directly on the stuck point. It helps loosen stuck drill pipe, drill collars, bottom hole assemblies, fishing tools, or other downhole components in oil and gas wells. Rig crews often use this operation for oil well stuck pipe recovery, gas well drill string release, differential sticking, keyseat sticking, tight hole sections, stuck BHA recovery, oilfield fishing, and downhole tool release.
To reset the jar after up jarring, the operator lowers the drill string and removes the pull load. The tool then returns to the ready position for the next jarring cycle.
Down Jarring Operation
Down jarring starts when the operator lowers or pushes the drill string downward. The QJZ jar uses an additional internal spring sleeve near the top of the slips to support this downward impact function.
As the downward load increases and reaches the preset trip load, the spring unit deforms. Then the trip sleeve engages the friction sleeve, and the mandrel releases suddenly to create downward impact. This force helps loosen jammed drill stem assemblies, stuck bottom hole assemblies, fishing tools, or other downhole tools when the wellsite operation requires force in the downward direction.
Down jarring works well in oil and gas wells where crews need to handle stuck BHA release, downhole obstruction removal, fishing tool operation, compression-related sticking, jammed drill stem assemblies, stuck downhole tool recovery, or complex drilling trouble treatment.
To reset the tool after down jarring, the operator pulls the drill string upward and removes the downward load. The jar then returns to the ready position for the next cycle.
Main Oilfield Applications
The SGPE QJZ Mechanical Drilling Jar supports many oilfield drilling and wellsite operations. It helps rig crews manage downhole sticking risks, recover stuck assemblies, and maintain drilling progress in difficult formations and complex wellbore conditions.
This mechanical jar can serve oil well drilling, gas well drilling, onshore drilling, offshore oil and gas drilling, deep well drilling, directional well drilling, horizontal well drilling, and extended reach drilling. It also suits stuck pipe recovery, drill string sticking treatment, bottom hole assembly release, oilfield fishing operations, downhole tool recovery, complex formation drilling, high-risk drilling sections, and drill stem jarring operations.
With fast impact response, strong mechanical performance, and dependable up and down jarring capability, the QJZ series gives drilling teams a practical solution for challenging downhole conditions.
Advantages of SGPE QJZ Mechanical Drilling Jar
Faster Response at the Wellsite
Sticking problems can increase rig cost within a short time. The QJZ jar delivers impact once the load reaches the trip setting, helping crews act before the condition becomes harder to solve.
Better Drilling Efficiency
The tool helps restore drill stem movement and reduces time spent on downhole trouble treatment. This supports smoother drilling progress and helps control overall wellsite cost.
Simple Mechanical Structure
The direct mechanical triggering system improves reliability in tough downhole conditions. It also gives crews straightforward operation and reset steps during repeated jarring cycles.
Flexible Model Selection
SGPE offers different outside diameters, strokes, jarring forces, tension ratings, torque ratings, and connection options. Customers can choose a model based on well depth, hole size, drill string design, BHA layout, and expected sticking risk.
Suitable for Harsh Oilfield Conditions
The jar handles high load, repeated impact, drilling torque, and difficult formations. It fits deep wells, directional wells, horizontal wells, offshore wells, and complex wellbore conditions.
Technical Specifications
| Model | QJZ95 | QJZ108 | QJZ121 | QJZ159 | QJZ165 | QJZ178 | QJZ203 | QJZ229 |
|---|---|---|---|---|---|---|---|---|
| O.D. mm | 95 | 108 | 121 | 159 | 165 | 178 | 203 | 229 |
| I.D. mm | 28 | 38 | 51 | 57 | 57 | 57 | 71.4 | 76.2 |
| Total Length mm | 6000 | 6000 | 6000 | 6970 | 6970 | 6468 | 7310 | 7820 |
| Upper Stroke mm | 200 | 200 | 200 | 142 | 142 | 149 | 145 | 203 |
| Lower Stroke mm | 200 | 200 | 200 | 172 | 172 | 168 | 178 | 203 |
| Max. Up Jarring Force kN | 200 | 300 | 430 | 620 | 620 | 700 | 800 | 800 |
| Max. Down Jarring Force kN | 100 | 150 | 300 | 360 | 360 | 420 | 450 | 450 |
| Max. Tension Load kN | 600 | 800 | 1400 | 2200 | 2200 | 2200 | 2500 | 3000 |
| Max. Working Torque kN·m | 4 | 8 | 10 | 15 | 15 | 15 | 20 | 25 |
| Connection | NC26 | NC31 | NC38 | NC46 | NC50 | NC50 | 6 5/8 REG | 7 5/8 REG |
| Flexion Connection Length mm | 3398 | 3370 | 3347 | 3456 | 3456 | 3476 | 3048 | 2580 |
| Pumping Area cm² | 33 | 44 | 50 | 100 | 100 | 133 | 176 | 227 |
| Weight kg | 360 | 432 | 573 | 1150 | 1240 | 1350 | 1780 | 2430 |
Model Selection Guide
Choosing the right mechanical drilling jar depends on the well structure, drill string design, and expected downhole risk. A suitable model should match the hole size, well depth, BHA layout, required jarring force, tension capacity, torque requirement, and connection type.
QJZ95, QJZ108, and QJZ121 suit smaller hole sizes and lighter drill string assemblies. These models offer compact structure and reliable jarring performance when tool outside diameter matters.
QJZ159, QJZ165, and QJZ178 fit common oil and gas well drilling programs. They provide higher impact capacity, stronger tension rating, and stable performance for regular drill stem applications.
QJZ203 and QJZ229 suit large hole sections, deep wells, heavy drill string assemblies, and high-load drilling conditions. QJZ229 offers a maximum tension load of 3000 kN, making it a strong option for demanding oilfield projects.
How to Choose a Mechanical Drilling Jar for Your Well
Before selecting a drilling jar, customers should review the drilling plan, well structure, drill string configuration, and expected downhole conditions. SGPE can recommend a suitable model after confirming key operating details, including hole size, well depth, well type, drill pipe size, drill collar size, BHA design, and connection type.
Customers should also provide the required up jarring force, required down jarring force, maximum tension load, working torque, expected sticking risk, and intended application. The application may involve drilling, fishing operations, stuck pipe recovery, or downhole tool release.
With this information, SGPE can match the jar with the actual well structure and field operation, helping customers choose a practical model for safer and more efficient oilfield drilling.
Quality and Supply Support
SGPE supports oilfield customers from technical inquiry to shipment. The team can assist with model selection, connection confirmation, technical communication, product inspection, export packing, and delivery planning.
For drilling contractors, oilfield service companies, and petroleum equipment distributors, SGPE provides practical support before and after order confirmation. Customers can request technical details, model recommendations, quotation support, and export supply information based on their drilling program.
SGPE can also discuss connection requirements, packing needs, documentation, and project delivery schedules based on each drilling project.
Why Choose SGPE?
SGPE supplies oilfield drilling tools for customers in the global petroleum industry. The company serves drilling contractors, oilfield service companies, petroleum equipment distributors, and drilling engineering projects with reliable downhole tools and drill stem tools.
By choosing the SGPE QJZ Mechanical Drilling Jar, customers get dependable mechanical jarring performance in both upward and downward directions. SGPE offers multiple models to match different oilfield conditions, well structures, drill string designs, and bottom hole assembly requirements. The QJZ series also supports standard drilling connections and provides strong tension and torque capacity for demanding drilling operations.
In addition, SGPE provides direct supply, practical technical support, competitive quotations, and assistance for stuck pipe recovery, fishing operations, and drill stem jarring applications. With experience in oilfield drilling tool supply, SGPE helps customers choose suitable drilling jars according to actual well conditions, drilling programs, and operation requirements.
Related Oilfield Drilling Tools
Customers who purchase the QJZ Mechanical Drilling Jar may also need other drill stem tools and downhole drilling tools for complete oilfield drilling projects. Depending on the well structure and drilling program, they may choose matched products such as hydraulic drilling jars, fishing jars, drill collars, stabilizers, Kelly valves, float valves, drill pipes, downhole motors, fishing tools, and other drill stem tools.
These related tools help customers build a more complete drill stem and downhole tool package for different oilfield drilling programs. They also make it easier for buyers to find compatible equipment from one supplier.
Frequently Asked Questions about Mechanical Drilling Jar
1. What is a QJZ Mechanical Drilling Jar?
A QJZ Mechanical Drilling Jar is a downhole drill stem tool that helps drilling crews release stuck drill string components during oil and gas drilling. It creates upward or downward impact when the applied load reaches the preset trip load.
SGPE designs this jar for stuck pipe recovery, BHA release, fishing operations, and drill stem jarring. The tool works inside the drill string and helps crews reduce downtime when drill pipe, drill collars, or bottom hole assemblies become stuck in the wellbore.
2. How does a mechanical drilling jar work in oilfield drilling?
A mechanical drilling jar uses a direct trip system to create impact. When the operator pulls up or pushes down on the drill string, the load inside the jar increases. Once the load reaches the required trip setting, the internal spring unit deforms, the trip sleeve engages the friction sleeve, and the mandrel releases.
This release creates a sharp impact force. The force travels through the drill stem and acts on the stuck point. In many cases, it helps loosen stuck drill pipe, drill collars, jammed BHA, or other downhole components.
3. What is the difference between up jarring and down jarring?
Up jarring creates upward impact through pulling force. Crews often use it when they need to pull a stuck drill string, BHA, or downhole tool upward from the stuck point.
Down jarring creates downward impact through pushing force. Crews use it when the operation requires downward force, such as fishing tool operation, jammed assembly release, or compression-related sticking treatment. The QJZ jar supports both directions, so the crew can respond to different stuck pipe conditions with one tool.
4. When should drilling crews use a mechanical drilling jar?
Crews should use a mechanical drilling jar when the drilling plan includes stuck pipe risk, tight hole sections, differential sticking, keyseat sticking, unstable formations, or poor hole cleaning. The jar helps the crew act quickly when the drill string loses movement or the BHA becomes difficult to move.
The QJZ series also suits drilling programs that require quick impact response, simple operation, and reliable up and down jarring. It works in oil wells, gas wells, deep wells, directional wells, horizontal wells, and offshore drilling operations.
5. What causes stuck pipe during oil and gas drilling?
Stuck pipe can happen for several reasons. Common causes include differential sticking, keyseat sticking, tight hole sections, cuttings buildup, borehole instability, sand bridges, collapsed formations, high dogleg severity, and poor drilling fluid circulation.
When the drill string becomes stuck, the crew needs controlled impact force to break resistance at the stuck point. A mechanical jar helps deliver that force through the drill stem and improves the chance of restoring movement.
6. Why choose a mechanical drilling jar instead of a hydraulic drilling jar?
A mechanical drilling jar releases impact when the load reaches the preset trip setting. This structure gives the tool fast response, simple operation, and easy reset steps. It also helps crews avoid delays related to hydraulic timing systems.
A hydraulic drilling jar usually uses hydraulic delay to control release timing. The QJZ mechanical jar focuses on quick jarring action, reliable mechanical triggering, and practical field operation. Many drilling crews choose it when they need a mechanical solution for stuck pipe recovery and drill stem jarring.
7. How do operators activate and reset the QJZ Mechanical Drilling Jar?
Operators activate up jarring by pulling the drill string upward until the tool reaches the preset trip load. After the jar fires, the operator lowers the drill string to remove the pull load and reset the tool.
Operators activate down jarring by lowering or pushing the drill string downward until the tool reaches the required trip load. After down jarring, the operator pulls upward to remove the downward load. This reset process helps crews continue jarring cycles during stuck pipe recovery or fishing work.
8. What oilfield applications suit the QJZ Mechanical Drilling Jar?
The QJZ jar suits many oilfield drilling and wellsite operations. It helps crews handle stuck pipe recovery, drill string sticking treatment, BHA release, fishing operations, downhole tool recovery, and drill stem jarring.
It also fits oil well drilling, gas well drilling, onshore drilling, offshore drilling, deep well drilling, directional drilling, horizontal drilling, and extended reach drilling. These applications make it a practical choice for drilling contractors, oilfield service companies, petroleum equipment suppliers, and drilling engineering teams.
9. How do I choose the right QJZ mechanical drilling jar model?
Start with the well structure and drill string design. Key factors include hole size, well depth, drill pipe size, drill collar size, BHA layout, connection type, expected sticking risk, required up jarring force, required down jarring force, maximum tension load, and working torque.
SGPE supplies QJZ95, QJZ108, QJZ121, QJZ159, QJZ165, QJZ178, QJZ203, and QJZ229. Each model has different outside diameter, inside diameter, stroke, impact capacity, tension rating, torque rating, and connection type. SGPE can help match the jar with actual well conditions.
10. Which connection types does the QJZ Mechanical Drilling Jar support?
The QJZ jar supports common oilfield drill stem connections, including NC26, NC31, NC38, NC46, NC50, 6 5/8 REG, and 7 5/8 REG. These options help customers match the tool with different drill pipes, drill collars, and bottom hole assemblies.
Before ordering, customers should confirm the required connection type, drill string size, and BHA design. Correct connection matching helps improve installation efficiency and supports safe operation at the wellsite.
11. What information should customers provide before requesting a quotation?
To receive an accurate quotation and model recommendation, customers should provide the required model or outside diameter, well type, well depth, hole size, drill string size, BHA design, connection type, expected jarring direction, required jarring force, maximum tension load, working torque, quantity, and delivery schedule.
Customers can also share the application, such as drilling, stuck pipe recovery, fishing operation, or downhole tool release. With these details, SGPE can recommend a suitable mechanical drilling jar and provide a clearer technical and commercial offer.
12. Why buy QJZ Mechanical Drilling Jar from SGPE?
SGPE supplies oilfield drilling tools for drilling contractors, oilfield service companies, equipment distributors, and engineering projects. The company supports customers with model selection, technical communication, product inspection, export packing, and delivery planning.
By choosing SGPE, customers get a reliable mechanical drilling jar supplier for stuck pipe recovery, up and down jarring, drill stem operations, and oilfield fishing applications. SGPE helps customers select suitable QJZ drilling jars according to well conditions, drilling programs, and operation requirements.
Order Information
To get a quotation for the SGPE QJZ Mechanical Drilling Jar, please share your required model or outside diameter, oil well or gas well type, well depth, hole size, drill string size, bottom hole assembly design, and connection type. You can also provide the required up jarring force, required down jarring force, maximum tension load, working torque, application purpose, quantity, and expected delivery schedule.
The application may include oilfield drilling, fishing operations, stuck pipe recovery, or downhole tool release. With these details, the SGPE team can review your working conditions, recommend a suitable mechanical drilling jar model, and provide a more accurate quotation for your oilfield operation.
Contact SGPE for QJZ Mechanical Drilling Jar
Looking for a reliable mechanical drilling jar manufacturer and supplier for oilfield drilling operations?
Contact SGPE today for technical support, model selection, and a competitive quotation. SGPE provides dependable QJZ Mechanical Drilling Jar solutions for drilling contractors, oilfield service companies, petroleum equipment distributors, and drilling engineering projects worldwide.
E-Mail:
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