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Junk Mills
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Bull Dog’s Junk Mills are available in multiple configurations—flat bottom, concave, cone buster, and tapered—designed to shred and remove general junk from the wellbore including tools, casing fragments, and packer parts. Dressed with sintered tungsten carbide and built to maximize fluid circulation through the body, they’re effective in both vertical and deviated wells. Sizes range from 3-1/8" to 13", and each mill can be customized based on material type and desired cut pattern.
Applications
Milling away junk or debris in the wellbore, such as packers, shoes, cement, or bridge plugs.
Grinding and removing downhole obstructions including tubing, drill pipe, or other metallic debris.
Cleaning out wellbore casing or liners by removing scale, hard deposits, or stuck materials.
Preparation for fishing operations by breaking down large pieces of junk for easier retrieval.
Workover and plug removal jobs where circulation and aggressive cutting are needed.
General wellbore cleanout during drilling, completion, or maintenance operations.
Features & Advantages
Maximum Circulation Design: Engineered for optimal fluid flow to keep the cutting surface clean and improve debris removal.
Multiple Configurations: Available in flat bottom, cone buster, concave, tapered string, and tapered styles for different job requirements.
Custom-Built Solutions: Mills can be designed and built to customer specifications or job-specific requirements.
Durable Construction: Dressed with crushed sintered carbide for superior wear resistance and aggressive cutting performance.
Versatile Applications: Effective on metal, cement, and other tough materials encountered downhole.
Field-Proven Reliability: Designed to withstand harsh downhole conditions while delivering consistent results.
Efficient Operation: Aggressive cutting surfaces reduce milling time and rig costs.
Specifications
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Bull Dog Tool junk mills are manufactured to order based on your application.
Frequently Asked Questions (FAQs)
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What is a Bull Dog® Junk Mill used for?
A Junk Mill is used to grind up and remove metal debris, stuck tools, bridge plugs, or packer parts from the wellbore. It’s commonly run in fishing and cleanout operations where milling is needed to clear obstructions and restore access.
What styles of Junk Mills does Bull Dog offer?
Bull Dog offers several milling face designs, including:
Flat Bottom
Concave Bottom
Cone Buster
TaperedEach style is selected based on the type of junk, well profile, and milling objective. Custom mill face profiles are available upon request.
How are Bull Dog Junk Mills constructed?
Each mill is built for maximum milling surface and circulation efficiency. The cutting surface is dressed with crushed sintered carbide, and tools are machined from high-strength alloy steel to withstand heavy torque and downhole impact loads.
When should I use a Junk Mill instead of a mill-out extension or bit?
Use a Junk Mill when you’re:
Dealing with hard metal debris or parts
Cleaning up sheared tubing, packers, or tools
Needing aggressive cutting with high circulation
Working in tight or restricted wellbores where a full bit isn't practical
Can Bull Dog customize Junk Mills for my job?
Yes — Bull Dog can build custom Junk Mills based on:
Casing or wellbore size
Debris profile
Circulation needs
Connection typeCustom carbide dressing patterns and cutting profiles are also available to meet unique milling objectives.