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Engineered drilling tools designed for demanding oilfield applications.
Reverse Circulation Junk Basket (RCJB)
The Reverse Circulation Junk Basket (RCJB) is designed to remove all types of small junk objects from the well hole.
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Downhole Tools
1. Product Overview
The Reverse Circulation Junk Basket (RCJB) is a downhole fishing tool designed to recover small junk objects from the wellbore using a reverse circulation flow path. When activated, the reverse flow helps carry debris into the tool barrel for retrieval, supporting effective hole clean-out before drilling continues or prior to running a new BHA.
RCJB is commonly used to collect metal shavings, carbide fragments, bearing pieces, and other small debris that may remain after bit damage or tool failure. It can also be configured with an optional magnet insert to improve recovery efficiency for ferrous particles while maintaining the reverse circulation feature.
2. What We Supply / Product Scope
- Reverse Circulation Junk Basket (RCJB) assemblies in multiple size ranges
- Interchangeable shoe options for different clean-out objectives (Type B / Type C / Finger Shoe)
- Optional magnet insert configuration for ferrous debris recovery
- Model-based activation components (e.g., steel ball size) as required
- Connections per specification (NC / REG / IF and other thread types upon request)
3. Key Features / Technical Highlights
- Reverse circulation mechanism to lift and carry small debris into the barrel
- Reverse drainage / flow-path concept to support cleaner handling during fishing operations (tool-specific)
- Interchangeable shoe design to match debris type and well conditions
- Optional magnet insert for improved ferrous particle capture when required
- Field-proven configuration suitable for routine clean-out and fishing preparation runs
4. Applications
- Collecting small junk after bit damage, carbide loss, or tool failure
- Wellbore bottom clean-up before drilling resumes or before running new BHA components
- Fishing preparation runs to reduce debris-related risk for subsequent tools
- Recovery of ferrous particles with optional magnet insert (when applicable)
5. Technical Specifications
RCJB selection is typically confirmed by hole size, barrel OD, maximum recovery capacity, activation component size (e.g., steel ball), and connection type. Shoe selection and magnet insert option are chosen based on the debris type and operating preference.
Type C Mill Shoe
Magnet Insert
Finger Shoe
Specifications - Reverse Circulation Junk Basket
Model | Barrel OD (mm) | Max. Recovery Size (mm) | Steel Ball OD (mm) | Connection (Box) | Recommended Hole Size (mm) |
LL-F86 | 86 | 51 | 23 | NC26 | 92～98 |
LL-F89 | 89 | 57 | 23 | NC26 | 95～102 |
LL-F92 | 92 | 57 | 23 | NC26 | 95～102 |
LL-F101 | 101 | 63.5 | 23 | NC26 | 105～114 |
LL-F114 | 114 | 78 | 28 | NC31 | 117～127 |
LL-F123 | 123 | 90.5 | 28 | NC31 | 130～140 |
LL-F130 | 130 | 95 | 34 | NC38 | 143～152 |
LL-F146 | 146 | 111 | 34 | NC38 | 155～165 |
LL-F159 | 159 | 121 | 34 | NC46 | 168～187 |
LL-F178 | 178 | 130 | 42 | NC50 | 190～210 |
LL-F200 | 200 | 154 | 42 | NC50 | 212～241 |
LL-F206 | 206 | 157 | 45 | NC50 | 216～241 |
LL-F232 | 232 | 179 | 57 | NC50 | 244～270 |
LL-F257 | 257 | 194 | 57 | 6 5/8REG | 273～295 |
LL-F279 | 279 | 211 | 57 | 6 5/8REG | 298～317 |
LL-F301 | 301 | 219 | 57 | 6 5/8REG | 320～346 |
LL-F330 | 330 | 249 | 57 | 6 5/8REG | 349～406 |
LL-F381 | 381 | 279 | 57 | 6 5/8REG | 406～444 |
LL-F508 | 508 | 406 | 57 | 7 5/8REG | 559～660 |
LL-F559 | 559 | 426 | 57 | 7 5/8REG | 610～711 |
6. Quality & Inspection (Project-Based)
- Incoming material verification (MTC review when provided / requested)
- Dimensional checks on key OD/ID and internal flow-path features per model
- Thread inspection per specified connection type
- Function-fit check for shoe components and activation parts (model-based)
- Final inspection before packing; photos available upon request
7. Spare Parts & After-Sales Support
- Interchangeable shoe supply support for replacement or different clean-out objectives
- Optional magnet insert supply upon request (model-matched)
- Repeat-order support by model and connection details to reduce reconfirmation time
8. RFQ Guideline (To Quote Faster & More Accurately)
To quote accurately and ensure the right configuration for your operation, please share the following information. If some items are not available, you may send drawings or the model list, and we will help complete the missing parameters.
- Hole size: target wellbore size range
- Model / barrel OD preference: or required OD limitation in the BHA
- Connection: top & bottom thread type and size (NC / REG / IF etc.)
- Junk type: metal shavings, carbide fragments, bearing pieces, mixed debris, etc.
- Shoe option: Type B / Type C / Finger Shoe (or your preference / photos)
- Magnet insert: required or not (for ferrous debris focus)
- Quantity & delivery window: target lead time and shipping term
Why Unionlever OFS
Unionlever OFS supports RCJB projects with an engineering-led workflow: we confirm hole size, model selection, shoe option, and connection details up front to reduce back-and-forth and avoid field mismatch risk. For repeat orders, we keep configuration records by model and connection to improve consistency, shorten reconfirmation time, and make trial orders easier to scale into stable long-term supply.
Frequently Asked Questions
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Contact Phone
Contact Email
sales@unionleverofs.com
ofs@unionlever.com
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Related Products
Building upon more than a decade of field experience, Unionlever OFS offers a comprehensive portfolio covering downhole drilling tools, fishing tools, handling tools, well control equipment, cementing tools, and solid-control systems.
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Unionlever Oilfield Equipment Co., Limited
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Unionlever International Group Limited
(Established Since 2010)
"To be a globally trusted leader in oilfield equipment and integrated supply solutions."
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