Description

Mechanical Internal Cutter | SGPE

Reliable downhole internal pipe cutter for oilfield workover, fishing, stuck pipe recovery, and casing/tubing cutting operations.

SGPE Mechanical Internal Cutter is a downhole pipe cutting tool for oilfield casing, tubing, and drill pipe. Operators run it inside the pipe string, anchor it against the inner wall, and cut the target pipe at the planned depth through mechanical rotation.

The ND-J internal cutter helps drilling contractors, workover crews, fishing service companies, and oilfield equipment rental providers handle stuck pipe recovery, tubing removal, casing repair, drill pipe cutting, well intervention, and plug and abandonment operations.

This internal pipe cutter uses a simple mechanical structure, a stable anchoring system, and three radial cutter blades. It does not require a hydraulic control system, so field crews can inspect, operate, and maintain it more easily in demanding oil and gas well conditions.

SGPE supplies mechanical internal cutters for common oilfield pipe sizes. Share your pipe size, pipe weight, top connection, cutting depth, and job purpose with our team, and we will help you select the right ND-J model for your operation.

What Is a Mechanical Internal Cutter?

A mechanical internal cutter is an oilfield downhole cutting tool that cuts pipe from the inside diameter. It helps crews separate casing, tubing, or drill pipe at a selected depth before they pull, fish, or recover the pipe section.

Unlike a mechanical external cutter, an internal cutter works inside the pipe string. This design suits jobs where crews need a controlled internal cut during workover, well servicing, fishing, well repair, stuck pipe recovery, or abandonment preparation.

SGPE ND-J Mechanical Internal Cutter supports casing cutting, tubing cutting, drill pipe cutting, and downhole pipe recovery in drilling, completion, production, and workover environments.

Key Benefits of SGPE Mechanical Internal Cutter

Simple Mechanical Design

The ND-J cutter uses a practical mechanical structure. Crews do not need complex hydraulic controls, so they can reduce preparation time, simplify operation, and lower maintenance pressure.

Stable Downhole Anchoring

The tool anchors against the inner pipe wall before cutting. This stable grip keeps the cutter in position and helps crews complete a smoother cut inside the wellbore.

Efficient Radial Cutting Action

Three cutter blades open outward along the tapered cutter block and cut the pipe wall as the mandrel rotates. This design improves cutting efficiency for casing, tubing, and drill pipe.

Strong Support for Fishing Jobs

Operators can use the internal cutter with a releasing spear to cut and retrieve tubing in one fishing operation. They can also cut first, then recover the pipe section with an overshot, fishing spear, or other downhole fishing tool.

Better Coupling Protection

Crews should avoid cutting directly at tubing or casing couplings. If the planned cutting point sits near a coupling, operators can use a coupling locator to find a safer cutting depth.

Wide Oilfield Pipe Coverage

SGPE offers several ND-J models for common oilfield pipe sizes. The cutter series supports drilling, workover, well intervention, fishing, pipe recovery, and plug and abandonment projects.

Oilfield Applications

SGPE Mechanical Internal Cutter serves oil and gas well operations that require controlled pipe cutting from inside the wellbore.

Common applications include:

Production tubing cutting during workover operations
Casing cutting for well repair or abandonment preparation
Drill pipe cutting during stuck pipe and fishing jobs
Removal of damaged, corroded, or blocked tubing
Tubing, casing, and drill pipe recovery
Downhole pipe cutting before fishing or pulling
Well intervention and well servicing support
Plug and abandonment pipe cutting at planned depths
Stuck pipe recovery after downhole failure

The tool helps crews make a clean internal cut before they retrieve or fish the pipe section.

How the Mechanical Internal Cutter Works

Operators lower the internal cutter to the required cutting depth inside the oil or gas well. Then they rotate the cutter mandrel clockwise for about three turns. This action separates the sliding sleeve and sliding sheet.

Next, the spring pushes the friction block against the inner pipe wall. At the same time, the sliding sleeve and sliding sheet engage. The main center body and slip section move upward along the tapered slip cone, and the slip diameter expands.

As the slips expand, they grip the pipe wall and anchor the cutter. After anchoring, the operator lifts the cutter mandrel by about 10 mm. Then the operator slowly lowers and rotates the mandrel.

The three cutter blades move down along the tapered cutter block and open outward. As the mandrel continues to rotate, the blades cut the casing, tubing, or drill pipe from inside. The cut finishes when the mandrel presses against the end of the thrust ring.

After cutting, the operator lifts the mandrel. The cutter blades return through their own weight and the blade spring. Meanwhile, the sliding sleeve and sliding sheet return to their original position. The tapered slip cone moves upward, the slips release the pipe wall, and the cutter disengages.

Finally, the operator lifts the mandrel until the locating ring engages with the guide nut. Then the crew pulls the tool out of the wellbore.

Operating Recommendations

For better cutting quality and longer blade life, operators should not cut directly at casing or tubing couplings. Couplings have thicker walls and different structures, so they may reduce cutting efficiency and affect tool stability.

Before running the cutter, crews should confirm pipe size, pipe weight, wall thickness, cutting depth, top connection, well condition, and recovery plan. If the cutting point sits close to a coupling, a coupling locator can help crews find the nearest coupling and choose a better cutting position.

For tubing recovery and fishing jobs, crews can use the mechanical internal cutter with a releasing spear. This combination helps cut and recover tubing in one operation when the well condition allows it. For other recovery plans, crews can cut first and then retrieve the cut section with a separate fishing tool.

Product Features

Feature	Description
Product Type	Oilfield downhole mechanical internal cutter
Main Function	Cuts casing, tubing, and drill pipe from inside the wellbore
Operation Method	Mechanical anchoring and rotational cutting
Cutting Blades	3 radial cutter blades
Tool Series	ND-J type
Main Uses	Workover, fishing, stuck pipe recovery, well intervention, pipe removal
Compatible Tools	Coupling locator, releasing spear, overshot, fishing spear, fishing tools
Key Benefits	Simple structure, stable anchoring, efficient internal cutting

Technical Specifications

Model	Tool O.D. (mm)	Connection	Tool I.D. (mm)	I.D. of Cut Pipe (mm)	O.D. of Cut Pipe (in)
ND-J73×55	55	1.9 NU Box	8	59–62	2 7/8
ND-J89×67	67	1.9 EU Box	13	70–78	3 1/2
ND-J114×91	91	NC26 Box	16	97–104	4 1/2
ND-J127×102	102	NC26 / 2 7/8 REG Box	18	107–115	5
ND-J140×112	112	NC31 / 2 7/8 REG Box	15	118–128	5 1/2
ND-J178×145	145	NC38 / NC31 / 3 1/2 REG Box	38	150–166	7
ND-J245×210	210	NC50 Box	50	216–228	9 5/8

How to Choose the Right Mechanical Internal Cutter

Choosing the right internal pipe cutter depends on pipe size, pipe weight, wall thickness, top connection, and downhole condition. A suitable model helps the cutter anchor securely, open the blades smoothly, and cut the pipe at the planned depth.

Before ordering, please confirm:

Pipe size to be cut
Pipe weight or wall thickness
Pipe type: casing, tubing, or drill pipe
Required cutting depth
Top connection
Well condition
Operation purpose, such as workover, fishing, pipe recovery, or plug and abandonment
Requirement for coupling locator, releasing spear, overshot, or other fishing tools

SGPE can recommend a suitable ND-J Mechanical Internal Cutter after reviewing your pipe specification and field operation requirements.

Why Choose SGPE Mechanical Internal Cutter?

SGPE supplies oilfield drilling, workover, fishing, and well servicing equipment for demanding oil and gas operations. Our mechanical internal cutter helps crews cut pipe at planned depths, recover pipe sections faster, and reduce downtime during workover and fishing projects.

Built for Oilfield Workover Conditions

Workover and fishing operations often involve stuck tubing, damaged casing, collapsed pipe, uncertain downhole conditions, and tight job schedules. SGPE designs the ND-J cutter for stable anchoring, easy handling, and reliable field performance.

Suitable for Casing, Tubing, and Drill Pipe

The cutter supports multiple oilfield pipe types. Service companies can use it for tubing cutting, casing cutting, drill pipe cutting, pipe recovery, well intervention, and abandonment preparation.

Easy to Operate and Maintain

The mechanical structure helps crews inspect, prepare, and maintain the tool efficiently. It also gives operators a clear working sequence during downhole cutting operations.

Reliable Oilfield Downhole Tool Supplier

As an oilfield downhole tool supplier, SGPE helps customers select suitable tools according to actual well conditions. We support drilling contractors, workover companies, fishing service teams, and oilfield equipment distributors with model selection and quotation support.

Related Downhole Fishing Tools

For complete oilfield fishing and pipe recovery operations, customers may also need related downhole tools, including:

Coupling Locator
Releasing Spear
Mechanical External Cutter
Overshot
Fishing Spear
Fishing Jar
Taper Tap
Die Collar
Safety Joint
Junk Mill

SGPE can help customers match internal cutters with suitable fishing tools according to well condition, pipe size, and recovery plan.

Ordering Information

When ordering SGPE Mechanical Internal Cutter, please specify:

Pipe size to be cut
Pipe weight or wall thickness
Pipe type: casing, tubing, or drill pipe
Required cutter model, if known
Top connection
Cutting depth
Well condition
Operation purpose: workover, fishing, well intervention, pipe recovery, or plug and abandonment
Requirement for coupling locator, releasing spear, overshot, or other fishing tools

Clear technical information helps SGPE recommend the correct cutter model, connection type, and matching tool combination for your oilfield operation.

Request a Quote

Looking for a reliable mechanical internal cutter supplier for oilfield casing, tubing, or drill pipe cutting?

Send SGPE your pipe size, pipe weight, top connection, cutting depth, and operation purpose. Our team will help you select the right ND-J Mechanical Internal Cutter and matching fishing tools for your workover, fishing, stuck pipe recovery, or pipe cutting project.

E-Mail:
info@sgpe.com

Frequently Asked Questions About Mechanical Internal Cutter

1. What is a mechanical internal cutter used for in oilfield operations?

A mechanical internal cutter cuts casing, tubing, and drill pipe from inside the wellbore. Oilfield crews use this downhole pipe cutting tool during workover, fishing, well intervention, stuck pipe recovery, casing repair, tubing removal, and plug and abandonment operations.

SGPE ND-J Mechanical Internal Cutter helps crews make a controlled cut at the planned depth before they pull, fish, or recover the pipe section.

2. Can SGPE Mechanical Internal Cutter cut casing, tubing, and drill pipe?

Yes. SGPE Mechanical Internal Cutter can cut oilfield casing, production tubing, and drill pipe. The correct model depends on pipe size, pipe weight, wall thickness, top connection, and downhole cutting condition.

This tool supports common pipe sizes used in drilling, completion, workover, well servicing, and fishing operations.

3. How does a mechanical internal cutter cut pipe inside the wellbore?

The operator runs the cutter into the pipe string and positions it at the required cutting depth. Then the operator rotates the mandrel clockwise to activate the tool. The slips expand and anchor the cutter against the inner pipe wall.

After anchoring, the operator lowers and rotates the mandrel. The three cutter blades open outward along the tapered cutter block and cut the pipe from the inside wall. After the cut finishes, the operator lifts the mandrel, releases the slips, retracts the blades, and pulls the tool out.

4. Why should operators avoid cutting at tubing or casing couplings?

Operators should avoid cutting directly at casing or tubing couplings because couplings have thicker walls and different structures than the pipe body. Cutting at a coupling may reduce cutting efficiency, damage the blades, shorten tool life, or make the operation less stable.

If the planned cutting depth sits close to a coupling, crews can run a coupling locator first. This helps them identify the nearest coupling and choose a safer cutting position.

5. Can the mechanical internal cutter work with a coupling locator?

Yes. SGPE Mechanical Internal Cutter can work with a coupling locator when crews need to confirm the coupling position before cutting. This combination helps operators avoid casing or tubing couplings and select a better cutting point inside the wellbore.

A coupling locator adds value in fishing, tubing recovery, casing cutting, and workover operations where cutting accuracy matters.

6. Can SGPE Mechanical Internal Cutter work with a releasing spear?

Yes. Operators can use SGPE Mechanical Internal Cutter with a releasing spear to cut and retrieve tubing in one fishing operation. This combination can save time during stuck tubing recovery or workover jobs.

In some pipe recovery operations, crews may cut the pipe first and then use an overshot, fishing spear, or another fishing tool to retrieve the cut section.

7. What pipe sizes can SGPE ND-J Mechanical Internal Cutter handle?

SGPE ND-J Mechanical Internal Cutter covers several common oilfield pipe sizes, including 2 7/8 in, 3 1/2 in, 4 1/2 in, 5 in, 5 1/2 in, 7 in, and 9 5/8 in.

Different models have different tool O.D., connection types, tool I.D., and cut pipe ranges. Customers should confirm pipe O.D., pipe I.D., pipe weight, wall thickness, and top connection before ordering.

8. How do I choose the right mechanical internal cutter model?

To choose the right model, you need to confirm pipe size, pipe weight, wall thickness, pipe type, top connection, cutting depth, and well condition. You should also tell SGPE whether the job involves casing cutting, tubing cutting, drill pipe cutting, stuck pipe recovery, or plug and abandonment.

SGPE can recommend a suitable ND-J cutter model after reviewing your pipe specification and operation requirements.

9. What is the difference between an internal cutter and an external cutter?

An internal cutter cuts pipe from the inside diameter, while an external cutter cuts pipe from the outside. Operators usually choose a mechanical internal cutter when they can run the tool inside the pipe string and need to cut casing, tubing, or drill pipe at a controlled depth.

An external cutter works better when crews need to cut from outside the fish or pipe body. The right choice depends on pipe condition, access space, fishing plan, and wellbore situation.

10. Does the ND-J Mechanical Internal Cutter need hydraulic or electric power?

No. SGPE ND-J Mechanical Internal Cutter uses mechanical anchoring and rotational cutting. It does not need a hydraulic or electric cutting system.

This design makes the tool easier to operate, inspect, and maintain in oilfield workover and fishing environments.

11. Can SGPE provide different top connections for the internal cutter?

Yes. SGPE can support different top connection requirements according to cutter model and customer operation needs. Common connection options may vary by model, pipe size, and field application.

When requesting a quotation, customers should provide the required top connection, pipe size, pipe weight, cutting depth, and operation purpose.

12. What information should I send to SGPE before ordering a mechanical internal cutter?

Before ordering, please send SGPE the pipe size, pipe weight or wall thickness, pipe type, top connection, cutting depth, well condition, and operation purpose. Please also mention whether you need a coupling locator, releasing spear, overshot, fishing spear, or other matching downhole fishing tools.

Clear technical information helps SGPE recommend the correct ND-J Mechanical Internal Cutter model, connection type, and matching tool combination. It also helps customers improve cutting efficiency, reduce job delays, and complete oilfield pipe recovery operations more smoothly.