Description
Drilling Junk Sub Fishing Cup for Oilfield Wellbore Cleanout
Product Overview
SGPE Drilling Junk Sub, also called a Junk Sub Fishing Cup, helps drilling crews collect heavy bottom-hole debris during oil and gas drilling. In many drilling operations, carbide teeth, bit fragments, bearings, cones, metal shavings, and broken tool parts may stay near the bottom of the wellbore because normal mud circulation cannot lift them to the surface.
These hard objects can damage the drill bit, reduce drilling efficiency, shorten bit life, and lead to unplanned trips. SGPE Junk Sub uses a simple cup-type structure to collect debris during circulation. When the drill string trips out, crews can clean the collected junk from the cup.
This tool supports wellbore cleanout, bottom-hole debris recovery, BHA debris control, drill bit protection, and oilfield fishing operations in demanding drilling environments.
What Is a Drilling Junk Sub?
A Drilling Junk Sub is a downhole cleanout and fishing tool installed in the drill string or bottom hole assembly. It uses drilling fluid movement, annular space change, and a collection cup to guide heavy debris into the tool.
Oilfield crews may also call it:
- Junk Sub
- Fishing Cup
- Junk Sub Fishing Cup
- Oilfield Junk Sub
- Drilling Fishing Cup
- Bottom Hole Junk Sub
- Wellbore Junk Catcher
- Drilling Debris Catcher
- BHA Junk Sub
- Bottom-Hole Junk Removal Tool
SGPE designs this tool for oil and gas drilling jobs where crews need to remove bottom-hole junk before it damages the drill bit, stabilizer, motor, or other BHA components.
Main Functions
SGPE Drilling Junk Sub helps drilling teams control bottom-hole debris and keep the drilling operation stable.
It helps crews:
- Collect heavy junk from oil and gas wellbores.
- Remove carbide teeth, bit cones, bearings, and steel fragments.
- Reduce drill bit damage caused by hard debris.
- Improve BHA reliability during drilling.
- Lower the risk of unplanned trips.
- Keep the wellbore cleaner before running sensitive downhole tools.
- Recover objects that drilling mud cannot circulate to the surface.
- Support vertical, directional, deep, extended-reach, and sidetrack drilling jobs.
Working Principle
SGPE Junk Sub works through controlled fluid movement and cup collection.
The external bowl has a larger outer diameter, which narrows the annular space between the tool and the wellbore. This design guides drilling fluid toward the cup area. At the cup mouth, the mandrel creates a larger flow space. As fluid moves through this changing flow area, it forms a swirling effect.
The swirl separates heavy debris from the circulating fluid. Heavy objects drop into the fishing cup, while drilling fluid continues through the wellbore. After the trip-out, crews remove the collected debris from the cup.
This practical structure makes the Junk Sub effective for bottom-hole cleanout, drilling debris collection, and drill bit protection.
Product Structure
| Component | Function in Oilfield Operation |
|---|---|
| Mandrel | Carries drilling load and provides the internal fluid passage. |
| External Bowl | Narrows annular space and guides drilling fluid toward the cup area. |
| Fishing Cup | Collects carbide teeth, bit fragments, cones, bearings, and heavy metal debris. |
| Top Connection | Connects with the upper drill string or BHA component. |
| Bottom Connection | Connects with the lower drilling tool or assembly. |
| Internal Flow Path | Helps create fluid swirl and supports debris separation. |
The tool uses a strong mechanical structure and a field-friendly design. Crews can run it as part of the drill string or BHA without complex surface control.
Key Advantages
Reliable Bottom-Hole Junk Collection
SGPE Junk Sub collects heavy debris that drilling mud cannot lift out of the well. It handles carbide teeth, bit pieces, cones, bearings, metal fragments, and other hard objects near the bottom of the hole.
Better Drill Bit Protection
Hard debris can damage cutters, cones, bearings, and gauge surfaces. The Junk Sub reduces direct contact between junk and the bit, helping crews extend bit service life and reduce costly downtime.
Cleaner Wellbore Bottom
A cleaner bottom hole helps the BHA run more smoothly. It also improves drilling stability and supports safer downhole tool operation.
Simple Field Operation
The tool works through fluid flow and cup geometry. Crews can run it with the drill string and recover collected debris during trip-out.
Wide Size Range for Oilfield Wells
SGPE offers multiple models for different hole sizes. Buyers can choose the right OD, ID, cup length, connection, and overall length according to the drilling program.
REG, NC, Box and Pin Connections
SGPE supplies common oilfield thread options, including REG and NC connections with Box and Pin combinations. These options help the Junk Sub match different drill string and BHA layouts.
Custom Configuration Support
SGPE can discuss customized OD, ID, length, thread type, and connection direction for special oilfield projects.
Oilfield Application Scenarios
SGPE Drilling Junk Sub fits a wide range of oil and gas drilling operations, including:
- Oil well bottom-hole cleanout
- Gas well debris recovery
- Drill bit protection during drilling
- BHA debris control
- Recovery of carbide teeth after bit wear
- Collection of bit cones, bearings, and metal fragments
- Directional drilling with high debris risk
- Deep well and extended-reach drilling
- Sidetrack drilling with possible metal debris
- Workover-related drilling and cleanout jobs
- Pre-cleanout before running sensitive downhole tools
- Wellbore cleaning after bit failure or BHA damage
This tool helps drilling contractors, oilfield service companies, and well operators reduce bottom-hole junk risk and protect expensive drilling equipment.
Types of Junk It Can Collect
SGPE Junk Sub can collect many types of heavy oilfield drilling debris, such as:
- Carbide teeth
- Drill bit fragments
- Bit cones
- Bearings
- Metal shavings
- Broken drilling tool parts
- Hard steel pieces
- Heavy bottom-hole particles
- Junk left after bit failure
- Debris left after downhole tool damage
- Objects that mud circulation cannot lift to the surface
For larger or irregular fish, crews can combine the Junk Sub with other oilfield fishing tools based on hole condition and fishing plan.
How to Select the Right Drilling Junk Sub
Selecting the right Junk Sub improves debris recovery and reduces operating risk. Before ordering, buyers should confirm the following details.
Hole Size
Match the Junk Sub OD with the actual wellbore size. The tool should provide enough clearance for safe running while maintaining effective fluid flow around the cup.
Connection Type
Confirm the required REG or NC thread, plus Box and Pin direction. Correct thread selection helps the tool fit the drill string and bottom hole assembly.
BHA Layout
Check the planned BHA position before ordering. The Junk Sub should match the tool string layout, circulation requirement, and drilling program.
Expected Debris Type
Different debris types may need different cup capacity and tool size. Carbide teeth, bearings, bit cones, and steel fragments often require reliable cup collection.
Drilling Condition
Consider vertical wells, directional wells, deep wells, sidetrack wells, and workover-related drilling conditions. Each operation may require a different OD, ID, or connection design.
Internal Diameter
Make sure the tool ID supports the required drilling fluid circulation. Proper ID selection helps maintain stable mud flow during drilling.
SGPE can recommend a suitable model after reviewing hole size, connection type, BHA design, and expected debris condition.
SGPE Manufacturing and Quality Support
SGPE supplies oilfield drilling tools for drilling contractors, oilfield service companies, petroleum equipment distributors, and energy project buyers. For Drilling Junk Sub production, SGPE focuses on practical field performance, stable machining quality, and clear model selection.
SGPE supports buyers with:
- Material selection for oilfield drilling conditions
- Accurate machining for OD, ID, shoulder, and connection areas
- REG and NC thread configuration support
- Box and Pin connection matching
- Dimensional checking before delivery
- Thread and connection inspection according to order requirements
- Custom OD, ID, length, and thread discussion
- Technical drawing confirmation for special orders
- Export-ready packing for international shipment
- Model selection support based on hole size and BHA layout
SGPE supports drilling contractors and oilfield service companies with model selection, connection matching, and export-ready supply for different wellbore cleanout projects.
Technical Specifications – Drilling Junk Sub
Note: B means Box connection, and P means Pin connection. SGPE can support detailed model selection according to drill string design, BHA layout, hole size, and oilfield working condition.
| Model | OD of Lower End × OD of Upper End (mm) | Bottom Conn. × Top Conn. | ID (mm) | Cup Length (mm) | OAL (mm) | Hole Size (mm) |
|---|---|---|---|---|---|---|
| LB79 | 79 × 79 | 2 3/8 REG B × P | 19 | 250 | 845 | 88.9–98.4 |
| LB89 | 89 × 78 | 2 3/8 REG B × P | 19 | 250 | 845 | 108–117.5 |
| LB94 | 94 × 79 | 2 3/8 REG B × P | 19 | 250 | 850 | 108–117.5 |
| LB102 | 102 × 93 | 2 7/8 REG B × P | 31.8 | 250 | 850 | 117.5–124 |
| LB114 | 115 × 105 | 3 1/2 REG B × P | 38.1 | 250 | 915 | 130–149 |
| LB118 | 118 × 105 | 3 1/2 REG B × P | 38.1 | 250 | 875 | 139.7–149 |
| LB127 | 127 × 108 | 3 1/2 REG B × B | 38.1 | 250 | 850 | 152.4–162 |
| LB127 | 127 × 108 | 3 1/2 REG B × P | 38.1 | 250 | 915 | 152.4–162 |
| LB133 | 133 × 121 | 3 1/2 REG B × NC38 B | 38.1 | 250 | 775 | 152.4–162 |
| LB133 | 133 × 108 | 3 1/2 REG B × P | 38.1 | 250 | 915 | 152.4–162 |
| LB133 | 133 × 121 | 3 1/2 REG B × NC38 P | 38.1 | 250 | 875 | 152.4–162 |
| LB133 | 133 × 121 | NC38 P × B | 38.1 | 250 | 875 | 152.4–162 |
| LB140 | 140 × 121 | 3 1/2 REG B × NC38 B | 38.1 | 250 | 775 | 165–190.5 |
| LB140 | 140 × 108 | 3 1/2 REG B × P | 38.1 | 250 | 850 | 165–190.5 |
| LB140 | 140 × 121 | NC38 B × P | 50.8 | 250 | 915 | 165–190.5 |
| LB146 | 146 × 121 | 3 1/2 REG B × NC38 B | 38.1 | 250 | 915 | 168–190.5 |
| LB146 | 146 × 108 | 3 1/2 REG B × P | 38.1 | 250 | 875 | 168–190.5 |
| LB165 | 165 × 152 | 4 1/2 REG B × NC46 B | 57.2 | 250 | 915 | 190.5–216 |
| LB165 | 165 × 140 | 4 1/2 REG B × P | 57.2 | 250 | 915 | 190.5–216 |
| LB168 | 168 × 146 | 4 1/2 REG B × B | 57.2 | 250 | 915 | 190.5–216 |
| LB168 | 168 × 152 | 4 1/2 REG B × NC46 B | 57.2 | 250 | 915 | 190.5–216 |
| LB168 | 168 × 140 | 4 1/2 REG B × P | 57.2 | 250 | 915 | 190.5–216 |
| LB178 | 178 × 159 | 4 1/2 REG B × NC50 B | 57.2 | 250 | 915 | 219–244.5 |
| LB178 | 178 × 165 | 4 1/2 REG B × NC50 B | 57.2 | 250 | 915 | 219–244.5 |
| LB178 | 178 × 159 | 4 1/2 REG B × NC46 B | 57.2 | 250 | 915 | 219–244.5 |
| LB178 | 178 × 146 | 4 1/2 REG B × P | 57.2 | 250 | 915 | 219–244.5 |
| LB178 | 178 × 165 | NC50 P × B | 57.2 | 250 | 940 | 219–244.5 |
| LB194 | 194 × 165 | 4 1/2 REG B × NC50 P | 71.4 | 250 | 950 | 229–273 |
| LB219 | 219 × 178 | 6 5/8 REG B × NC50 B | 76.2 | 250 | 915 | 244–289 |
| LB219 | 219 × 197 | 6 5/8 REG B × P | 76.2 | 250 | 915 | 244–289 |
| LB219 | 219 × 203 | 6 5/8 REG B × P | 76.2 | 250 | 915 | 244–289 |
| LB241 | 241 × 203 | 6 5/8 REG B × P | 76.2 | 250 | 950 | 292–330 |
| LB245 | 245 × 203 | 6 5/8 REG B × B | 76.2 | 250 | 915 | 292–330 |
| LB245 | 245 × 203 | 6 5/8 REG B × P | 76.2 | 250 | 950 | 292–330 |
| LB245 | 245 × 203 | 6 5/8 REG P × B | 76.2 | 250 | 940 | 292–330 |
| LB273 | 273 × 203 | 6 5/8 REG B × P | 76.2 | 250 | 945 | 330–375 |
| LB327 | 327 × 241 | 7 5/8 REG B × B | 76.2 | 250 | 950 | 375–444.5 |
| LB327 | 327 × 241 | 7 5/8 REG B × P | 76.2 | 250 | 965 | 375–444.5 |
| LB327 | 327 × 241 | 7 5/8 REG P × B | 76.2 | 250 | 1040 | 375–444.5 |
Why Choose SGPE Drilling Junk Sub?
SGPE understands oilfield drilling requirements and provides Junk Subs for real drilling, cleanout, and debris recovery operations. The company supports international buyers with wide model coverage, flexible connection options, and practical technical guidance.
Buyers choose SGPE because we offer:
- Wide OD and hole size coverage for oil and gas wells
- REG, NC, Box and Pin connection options
- Strong tool structure for demanding drilling conditions
- Accurate machining and dimensional checking
- Thread and connection checking before shipment
- Model selection support before quotation
- Custom size and thread discussion for special projects
- Export-ready packaging for overseas delivery
- Reliable supply for drilling contractors and oilfield service companies
SGPE helps customers match each Drilling Junk Sub with the wellbore size, BHA layout, connection requirement, circulation condition, and expected debris type.
Frequently Asked Questions About Drilling Junk Sub
1. What is a Drilling Junk Sub used for in oilfield drilling?
A Drilling Junk Sub collects heavy debris from the bottom of an oil or gas wellbore. It helps remove carbide teeth, bit fragments, bearings, cones, metal shavings, and broken tool parts that normal mud circulation may leave behind. By storing this junk inside the cup, the tool helps protect the drill bit, BHA, and other downhole tools.
2. Is a Junk Sub the same as a Fishing Cup?
Yes. Many oilfield crews use the names Junk Sub, Fishing Cup, Junk Sub Fishing Cup, and Drilling Fishing Cup for this type of downhole cleanout tool. It works as a drilling debris catcher and helps collect heavy metal junk near the wellbore bottom.
3. Where should operators install a Drilling Junk Sub in the drill string?
Operators usually install a Drilling Junk Sub near the bottom hole assembly. The exact position depends on the drilling program, BHA layout, hole size, circulation requirement, and expected debris type. Many crews place it where it can collect heavy debris before the debris reaches the bit.
4. What types of debris can SGPE Junk Sub collect?
SGPE Junk Sub can collect carbide teeth, drill bit fragments, bit cones, bearings, metal shavings, broken drilling tool parts, hard steel pieces, and junk left after bit failure or downhole tool damage. It suits heavy debris that drilling mud cannot remove effectively.
5. Why can’t drilling mud circulation remove all bottom-hole junk?
Drilling mud can carry many light cuttings to the surface, but heavy metal debris often remains at the bottom of the wellbore. Carbide teeth, bearings, bit cones, and steel fragments may exceed the lifting capacity of normal circulation. The Junk Sub Fishing Cup gives these objects a place to settle and stay.
6. How does a Junk Sub protect the drill bit?
A Junk Sub protects the drill bit by collecting hard debris before it contacts cutters, cones, bearings, or gauge surfaces. This helps reduce bit damage, extend bit service life, and lower the risk of unplanned trips. In high-debris drilling conditions, it also supports smoother BHA operation.
7. How does SGPE Drilling Junk Sub work?
SGPE Drilling Junk Sub uses drilling fluid flow and cup geometry to collect heavy debris. The external bowl narrows the annular space and guides fluid toward the cup area. Near the cup mouth, the flow area changes and creates a swirling effect. Heavy debris separates from the fluid and drops into the cup, while drilling fluid continues through the wellbore.
8. What is the difference between a Junk Sub and a Junk Basket?
A Junk Sub usually uses a cup-type structure and fluid flow change to collect heavy debris during drilling. A Junk Basket may use other catching mechanisms for fishing, cleaning, or debris recovery. Operators choose the right oilfield fishing tool according to debris size, debris shape, hole condition, BHA design, and cleanout plan.
9. Can SGPE Junk Sub work in directional wells and deep wells?
Yes. SGPE Junk Sub can support directional drilling, deep well drilling, extended-reach drilling, sidetrack drilling, and workover-related drilling jobs. For these applications, buyers should confirm hole size, tool OD, connection type, BHA layout, and circulation requirement before ordering.
10. How do I choose the right Junk Sub OD and hole size range?
Choose the Junk Sub OD according to the actual wellbore size, required clearance, BHA design, and debris collection requirement. The tool should run safely in the hole while still supporting effective fluid flow and bottom-hole debris recovery. SGPE can help select a suitable model after reviewing hole size, drill string connection, and expected debris type.
11. What connection types are available for SGPE Drilling Junk Sub?
SGPE offers common oilfield connection options, including 2 3/8 REG, 2 7/8 REG, 3 1/2 REG, 4 1/2 REG, 6 5/8 REG, 7 5/8 REG, NC38, NC46, and NC50. Buyers can choose Box and Pin combinations according to drill string design, BHA layout, and field requirements. SGPE can also discuss custom thread options for special oilfield projects.
12. What information should I provide when requesting a quotation?
Please provide hole size, required OD and ID, top and bottom connection, preferred model, quantity, drilling condition, well type, BHA layout, and expected debris type. For custom Drilling Junk Sub projects, you can also share drawings, thread requirements, or special operating conditions. SGPE will help match the right Junk Sub Fishing Cup to your oil and gas drilling operation.
Request a Quote
Need a reliable Drilling Junk Sub Fishing Cup for oilfield wellbore cleanout?
Contact SGPE with your hole size, connection type, preferred model, quantity, BHA layout, and drilling condition. Our team will help you choose the right Junk Sub for your oil and gas drilling operation.
E-Mail:
info@sgpe.com
