Description

KXJ Type Fishing Bumper Sub

Oilfield Fishing Bumper Jar for Stuck Pipe Recovery and Workover Operations

SGPE KXJ Type Fishing Bumper Sub helps oilfield crews create controlled upward and downward impact in the wellbore. Field teams use this mechanical bumper jar for oilfield fishing, workover, drilling intervention, stuck drill stem release, stuck pipe recovery, milling, cutting, reversing and thread release operations.

In oil and gas wells, drill stems, tubing strings, bottom-hole assemblies and fishing tools may get stuck due to differential sticking, cuttings beds, key seats, tight holes, borehole instability or mechanical obstruction. When this happens, the KXJ Fishing Bumper Sub helps the fishing string transfer impact force to the stuck point and improves the chance of recovery.

The tool also supports rotation when lifting and jarring alone cannot release the fish. This rotation helps operators engage or disengage releasable fishing tools and maintain better control during complex downhole recovery work.

During milling and cutting jobs, the bumper sub provides steady feeding force to mechanical internal cutters. This helps the cutter maintain stable contact with tubing, casing, stuck pipe or other downhole components. When combined with a reversing unit, the tool helps compensate for the rising stroke after reversing and supports thread release.

The SGPE KXJ range covers multiple sizes, work strokes, tensile load ratings, torque capacities and oilfield thread connections. Available models include KXJ31B, KXJ34B, KXJ36B, KXJ42B, KXJ44B, KXJ46B, KXJ62B, KXJ64B, KXJ70B, KXJ76B, KXJ80B, KXJ85B and KXJ90B.

Multiple KXJ Models | NC and REG Connections | Model Selection Support

Get a quote for your required model, connection and well condition.

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Quick Product Overview

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What Is a KXJ Type Fishing Bumper Sub?

A KXJ Type Fishing Bumper Sub is a mechanical downhole jarring tool for oil and gas well fishing operations. It works as part of the drill string or fishing string and allows axial movement within a designed stroke. This movement creates impact energy and transfers force to the stuck point or fishing assembly.

Oilfield crews use this tool to release stuck drill stem, recover downhole fish, free stuck pipe and support well intervention work. Its practical structure, strong impact performance and reliable torque transmission make it suitable for demanding fishing and workover conditions.

In different oilfield markets, buyers may also call this tool a fishing bumper sub, KXJ fishing bumper sub, mechanical bumper jar, downhole bumper sub, oilfield jarring tool or stuck pipe fishing tool. These names usually describe the same mechanical tool used in fishing, recovery and workover operations.

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Main Oilfield Applications

Oilfield Fishing Operations

The KXJ Fishing Bumper Sub helps crews recover stuck tools, broken drill stem, tubing, junk, fish and other downhole objects. It delivers repeated impact through the fishing string and helps improve recovery success in difficult well conditions.

Stuck Drill Stem and Stuck Pipe Recovery

Stuck pipe problems may come from differential pressure, cuttings accumulation, key seating, borehole instability, tight holes, collapsed formations or mechanical blockage. The bumper sub helps operators apply strong bumping force to the stuck point and increase the chance of release.

Releasable Fishing Tool Operation

Crews often run releasable fishing tools during oilfield recovery jobs. When lifting and jarring cannot release the fish, the operator can rotate the bumper sub. This action helps engage or disengage the fishing tool and improves control over the fishing assembly.

Milling Operations

In milling jobs, the tool helps maintain controlled feeding force. This supports milling tools during the removal of downhole obstructions, damaged equipment, stuck metal parts and wellbore debris.

Cutting Operations

When the bumper sub works with a mechanical internal cutter, it helps the cutter maintain stable contact with pipe, tubing or casing. This steady feed improves cutting control and supports a smooth, even cut.

Reversing and Thread Release

When combined with a reversing unit, the bumper sub helps compensate for the rising stroke after reversing. This function supports thread release during oilfield fishing, workover and downhole intervention operations.

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Key Features

Strong Mechanical Impact

The KXJ bumper sub converts stored strain energy and stroke energy into powerful bumping force. This helps crews handle stuck drill stem, stuck pipe, downhole fish and other fishing challenges.

Upward and Downward Bumping

Operators can bump upward or downward according to the well condition. This flexibility improves control during fishing, stuck pipe recovery, drilling intervention and workover operations.

Reliable Torque Transmission

The tool supports rotation during tool engagement, tool release and reversing operations. Depending on the model, the maximum working torque ranges from 3 kN·m to 25 kN·m.

Wide Size Range

The available range covers models from KXJ31B to KXJ90B, with outer diameters from 79 mm to 229 mm. This helps customers match different wellbore sizes, casing sizes and fishing assemblies.

High Tensile Load Capacity

The maximum tensile load ranges from 300 kN to 2200 kN. Larger models suit heavy-duty fishing, stuck drill stem release and stuck pipe recovery operations.

Multiple Work Stroke Options

Available work strokes include 508 mm, 1000 mm, 1400 mm and 1500 mm. A longer stroke can help create greater jarring force when the well condition and string design support it.

Practical for Demanding Downhole Conditions

Oilfield fishing jobs require durable and dependable tools. The KXJ Fishing Bumper Sub helps crews handle difficult recovery tasks with better control and higher operational confidence.

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Working Mechanism

The KXJ Type Fishing Bumper Sub creates jarring force through mechanical energy conversion.

During downward jarring, the operator applies lifting load to the drill stem. The bumper jar opens to a certain height and stores potential energy. As the lifting load increases, the drill stem stretches and stores strain energy like a spring.

When the operator releases the lifting load, the drill stem accelerates downward. At the same time, the bumper jar moves toward the closed position and releases its stored energy.

These two energy sources combine at the impact moment. The fishing string then delivers strong downward jarring force to the stuck point. This force helps loosen the stuck drill stem, release the fish or support other well intervention work.

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Main Factors That Influence Jarring Force

Hanging Weight Above the Bumper Jar

More hanging weight above the bumper jar can create stronger impact. Operators should adjust the operation according to the well condition, fishing string design and stuck point condition.

Drill Stem Spring Extension

A longer drill stem extension stores more strain energy during lifting. More stored energy can create stronger impact after release.

Stroke Length

The bumper jar stroke also affects jarring performance. A longer stroke can help generate greater bumping force when the fishing string design and well condition allow it.

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Product Specifications

Need help choosing a model? Send your required connection, well condition and operation type.

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Available Models and Connections

The KXJ bumper sub range supports different oilfield fishing assemblies, drill strings and workover requirements.

Available models include KXJ31B, KXJ34B, KXJ36B, KXJ42B, KXJ44B, KXJ46B, KXJ62B, KXJ64B, KXJ70B, KXJ76B, KXJ80B, KXJ85B and KXJ90B.

Available connections include 2 3/8 REG, NC26, NC31, NC38, NC50, 6 5/8 REG and 7 5/8 REG. Customers can choose the right connection according to drill string design, fishing string layout and wellsite requirements.

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How to Select the Right KXJ Fishing Bumper Sub

A correct model helps improve fishing efficiency and reduce operation risk. Before ordering, customers should check the following factors.

Wellbore and Casing Size

Choose the outer diameter according to casing size, wellbore clearance and fishing assembly design.

Fishing String Connection

Confirm the thread connection before purchase. Common oilfield connections include REG, NC26, NC31, NC38, NC50 and large REG threads.

Tensile Load Requirement

Heavy-duty fishing jobs need higher tensile capacity. SGPE offers KXJ bumper subs with maximum tensile load up to 2200 kN.

Torque Requirement

If the operation needs rotation, tool release or reversing, check the maximum working torque before selecting the model.

Work Stroke Requirement

Different work strokes suit different jarring needs. Longer strokes can help increase impact force when the string design and well condition support it.

Operation Type

Fishing, stuck pipe release, stuck drill stem release, milling, cutting and reversing jobs may require different specifications. Share the actual oilfield operation details before confirming the model.

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Quality Control and Technical Support

SGPE focuses on reliable oilfield fishing tools and downhole tools for drilling contractors, workover companies, oilfield service providers and petroleum equipment distributors.

For KXJ Type Fishing Bumper Subs, our team supports model selection, connection confirmation, technical communication and specification review before order confirmation. Before delivery, key dimensions, thread connection, assembly condition and specification requirements can be checked according to the customer’s purchase order.

Inspection items may include dimensional check, thread inspection, assembly check and documentation review according to project requirements. Customers can also request inspection and documentation support for oilfield fishing and workover projects. Packing and delivery documents can follow order requirements. This helps reduce mismatch risk and improves order accuracy.

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Why Choose SGPE as Your Fishing Bumper Sub Supplier?

SGPE supplies oilfield fishing tools, drilling tools and downhole tools for oil and gas operations. The KXJ Type Fishing Bumper Sub range gives customers practical choices for stuck drill stem release, stuck pipe recovery, downhole fishing, milling, cutting and reversing jobs.

Customers choose SGPE because we offer:

• Multiple KXJ fishing bumper sub models
• Common NC and REG oilfield connections
• Wide O.D., I.D., tensile load and torque options
• Work stroke options for different jarring needs
• Model selection support before order confirmation
• Technical communication for project requirements
• Stable supply for distributors, contractors and service companies

Our team helps customers choose a suitable mechanical bumper jar for oilfield fishing and workover operations.

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Other Names Used in Oilfield Operations

In different oilfield markets, buyers may also call this tool a fishing bumper sub, KXJ fishing bumper sub, mechanical bumper jar, downhole bumper sub, oilfield jarring tool or stuck pipe fishing tool. These names usually refer to the same type of mechanical tool used in fishing, stuck pipe recovery and workover operations.

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Related Oilfield Tools

Customers who search for KXJ Type Fishing Bumper Sub often need other oilfield fishing, drilling and workover tools for the same operation plan. SGPE can help match this bumper sub with suitable downhole tools according to the well condition, fishing string design and recovery target.

For complete oilfield fishing assemblies, customers may also consider SGPE oilfield fishing tools, drilling tools and downhole tools. In many workover and recovery jobs, the KXJ Fishing Bumper Sub can work together with fishing jars, overshots, releasing and reversing tools, mechanical internal cutters and other workover tools to improve operational control and fishing efficiency.

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Frequently Asked Questions About KXJ Type Fishing Bumper Sub

1. What is a KXJ Type Fishing Bumper Sub?

The KXJ Type Fishing Bumper Sub is a mechanical bumper jar for oilfield fishing, stuck pipe recovery and workover operations. It helps the fishing string create controlled upward or downward impact in the wellbore.

Oilfield crews use this tool to release stuck drill stem, recover downhole fish, free stuck pipe and support well intervention jobs. It also assists milling, cutting, reversing and thread release operations in oil and gas wells.

2. How does a KXJ Fishing Bumper Sub work in the wellbore?

The KXJ Fishing Bumper Sub creates jarring force through axial movement and mechanical energy conversion. First, the operator applies lifting load to the drill stem. The drill stem stretches and stores strain energy. At the same time, the bumper jar opens within its work stroke and stores potential energy.

Then, the operator releases the lifting load. The drill stem accelerates downward, and the bumper jar moves toward the closed position. These forces combine and create strong impact in the fishing string. This impact helps loosen the stuck point and improves the chance of recovery.

3. What oilfield operations can the KXJ Type Fishing Bumper Sub support?

This tool supports oilfield fishing, stuck drill stem release, stuck pipe recovery, workover, drilling intervention, milling, cutting, reversing and thread release operations.

Crews often run it with drill strings, fishing strings, releasable fishing tools, mechanical internal cutters and reversing units. Because it can create repeated impact and support rotation, it works well in both routine workover jobs and difficult downhole recovery operations.

4. Can the KXJ Fishing Bumper Sub help release stuck drill stem or stuck pipe?

Yes. The KXJ Fishing Bumper Sub helps crews release stuck drill stem, stuck pipe, stuck tubing and other stuck downhole assemblies. It delivers repeated bumping force to the stuck point and helps break resistance around the fish or pipe string.

Stuck pipe problems may come from differential sticking, cuttings beds, key seats, tight holes, wellbore collapse or mechanical obstruction. In these conditions, the bumper sub gives the crew a practical mechanical impact tool for fishing and recovery work.

5. Can this bumper sub work with releasable fishing tools?

Yes. The KXJ Type Fishing Bumper Sub can work with releasable fishing tools in oil and gas wells. When lifting and jarring cannot release the fish, the operator can rotate the bumper sub to help engage or disengage the fishing tool.

This function gives the crew better control over the fishing assembly. It also helps reduce the risk of sticking or losing additional tools during complex downhole fishing jobs.

6. Why do crews use a bumper sub in milling and cutting operations?

Crews use a bumper sub in milling and cutting jobs because it provides steady feeding force. When the tool works with a mechanical internal cutter, it helps the cutter maintain stable contact with tubing, casing, stuck pipe or damaged downhole components.

This steady feed improves cutting control and supports a smoother, more even cut. It also helps crews remove downhole obstructions, stuck metal parts and wellbore debris more efficiently.

7. What KXJ Type Fishing Bumper Sub models does SGPE offer?

SGPE offers KXJ31B, KXJ34B, KXJ36B, KXJ42B, KXJ44B, KXJ46B, KXJ62B, KXJ64B, KXJ70B, KXJ76B, KXJ80B, KXJ85B and KXJ90B.

These models cover different outer diameters, inner diameters, tensile load ratings, work torque ratings, work strokes, closed lengths, weights and thread connections. Customers can select a model according to wellbore size, casing size, fishing string design and operation requirements.

8. What size range and main specifications are available?

The KXJ Type Fishing Bumper Sub range covers O.D. from 79 mm to 229 mm and I.D. from 25.4 mm to 76 mm. The sealing pressure is 30 MPa across the listed models.

Depending on the selected model, the maximum tensile load ranges from 300 kN to 2200 kN, and the maximum working torque ranges from 3 kN·m to 25 kN·m. Available work strokes include 508 mm, 1000 mm, 1400 mm and 1500 mm. These options help customers match different oilfield fishing and workover conditions.

9. What connections are available for the KXJ Fishing Bumper Sub?

Available connections include 2 3/8 REG, NC26, NC31, NC38, NC50, 6 5/8 REG and 7 5/8 REG. These thread connections help the bumper sub match different drill strings and fishing strings.

Before ordering, customers should confirm the thread type, connection size, fishing string layout and wellsite requirement. SGPE can help check the suitable connection according to the selected model and application.

10. How do I select the right KXJ Type Fishing Bumper Sub?

To select the right KXJ Type Fishing Bumper Sub, customers should check wellbore size, casing size, fishing string connection, stuck point condition, tensile load, torque requirement, work stroke and operation type.

For heavy-duty fishing or stuck pipe recovery, choose a model with higher tensile capacity and suitable torque rating. For jobs that need stronger impact, also check the work stroke, hanging weight and fishing string design. A correct model helps improve fishing efficiency and reduce mismatch risk.

11. What factors influence the jarring force?

The main factors include hanging weight above the bumper jar, drill stem spring extension and bumper jar stroke length. Higher hanging weight can create stronger impact. Longer drill stem extension can store more strain energy before release.

The work stroke also affects jarring performance. A longer stroke can help generate greater impact when the well condition and string design support it. Because every fishing job has different downhole conditions, operators should choose the model and operating method carefully.

12. Why should buyers choose SGPE for KXJ Type Fishing Bumper Sub orders?

Buyers choose SGPE because we understand the needs of oilfield purchasing teams, drilling contractors and service companies. A fishing bumper sub must match the well condition, tool string and operation plan, so clear technical communication matters before every order.

SGPE helps customers reduce selection errors, shorten inquiry time and prepare orders with accurate technical details. For stuck pipe recovery, workover fishing, milling support or downhole tool replacement, our team helps buyers move from inquiry to order confirmation more smoothly.

For project-based purchasing or long-term cooperation, SGPE provides responsive communication and dependable support for oilfield fishing tool orders.

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Request a Quote for KXJ Type Fishing Bumper Sub

Looking for a reliable KXJ Type Fishing Bumper Sub supplier for oilfield fishing, stuck pipe recovery or workover operations?

Send SGPE your required model, connection, quantity, well condition and operation type. You can also share casing size, fishing string design, stuck point condition and target application. Our team will help confirm the suitable specification and provide price details.

Contact SGPE now to get technical support, model selection assistance and a fast quotation for KXJ Type Fishing Bumper Sub.

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