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Bull Dog® Bailer
Field Proven
Successfully used in vertical, deviated, and horizontal wells.
Frequently selected when circulating the well is impractical or undesirable.
Commonly deployed for sand, scale, frac balls, and bridge plug recovery.
Designed for workover, completion, and well intervention operations.
Over the years, we've found that recovery efficiency is largely determined before the tool ever enters the well. Matching the tubing cavity, fluid level, bottom-hole assembly, and expected debris to the application typically produces more consistent cleanout than simply increasing displacement.
Engineer's Note
The Bull Dog® Bailer is the original unconventional circulation cleanout tool designed for efficient sand and debris recovery in fluid-sensitive or low-pressure wells. Trusted by field operators for over 40 years, it removes frac sand, frac balls, bridge plugs, and more—without loading the hole or requiring circulation.
Key Features
Non-circulating cleanout
Handles various debris – Sand, scale, frac balls, caved formation, etc.
Reciprocating pump action – 5-ft. stroke draws solids into a tubing cavity
Run on tubing or drill pipe – Highly adaptable to job conditions
Mandrel body – Allows normal rotation of the string
Versatile bottom-hole compatibility – Supports bits, shoes, overshots, etc.
Available sizes – 1.883" to 6.5" OD
How It Works
The Bull Dog® Bailer system uses a reciprocating pump assembly and float valve to pump fluid and debris through the bottom-hole tool and into a tubing cavity.
Solids settle in the chamber above the float
Fluid passes through the pump and exits to the annulus
No surface pump truck needed
Cleanout continues until the tubing is filled with debris and tripped
A weight chart is available to help operators optimize bottom-hole assembly based on fluid level and tool diameter.
When to Use the Bull Dog® Bailer
Consider using the Bull Dog® Bailer in the following well conditions:
Circulation is not possible
Adding fluid could damage pay zones
Cleanout cost is a concern versus circulating setup
Static fluid level is at least 400 ft (for optimal pressure differential)
Drilling, fishing, or cleanout applications require tool recovery
Field-Proven Performance
Each Bull Dog® Bailer is manufactured in-house by Bull Dog Tool—the original equipment manufacturer (OEM). With decades of iterative improvements, the tool is field-proven across drilling, fishing, milling, and cleanout applications.
Conventional well cleanout methods often require circulating large volumes of fluid—something that isn't always practical or desirable in low-pressure or fluid-sensitive wells. The Bull Dog Bailer was developed to provide operators with an efficient way to recover sand and debris without depending on continuous circulation, giving them another option when protecting the formation is just as important as cleaning the well.
Why We Built It
Applications
The Bull Dog® Bailer is used to recover sand, frac balls, caved formation, and other wellbore debris when circulation is restricted or fluid loss is a concern. Ideal for cleanout jobs in non-flowing or low-pressure wells, it enables efficient debris removal without introducing hydrostatic fluid, making it a preferred solution in sensitive pay zones and cost-conscious operations.
Features & Advantages
Non-circulating cleanout
Handles various debris – Sand, scale, frac balls, caved formation, etc.
Reciprocating pump action – 5-ft. stroke draws solids into a tubing cavity
Run on tubing or drill pipe – Highly adaptable to job conditions
Mandrel body – Allows normal rotation of the string
Versatile bottom-hole compatibility – Supports bits, shoes, overshots, etc.
Available sizes – 1.883" to 6.5" OD
Specifications
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Size O.D. | Conn. Size | Length of Stroke | Length of Tool | Torque Rating | Tensile Strength | Displacement (Gal. per Stroke) | I.D. of Float Sub |
1.883" | 1 13/16" W.F.J. | 4' | 7.65' | 1,440 Ft. Lbs. | 80,250 | .22 | 5/8" |
2 1/4" | 1 1/2" 10 RD N-U | 4' | 7.87' | 2,760 Ft. Lbs. | 132,000 | .3 | 1 1/8" |
3 1/8" | 2 3/8" 8 RD | 5' | 9.35' | 8,600 Ft. Lbs. | 166,500 | 1.4 | 1 1/4" |
3 3/4" | 2 7/8" 8 RD | 5' | 9.35' | 12,470 Ft. Lbs. | 288,000 | 2.0 | 1 1/2" |
4 5/8" | 2 7/8" 8 RD | 5' | 9.60' | 30,000 Ft. Lbs. | 476,700 | 3.1 | 2 13/16" |
6 1/2" | 4 1/2" FH | 8' | 13.5' | 69,341 Ft. Lbs. | 544,800 | 11.0 | 2 3/4" |
Frequently Asked Questions (FAQs)
What is the Bull Dog® Bailer used for?
The Bull Dog® Bailer is a non-circulating cleanout tool used to remove sand, debris, frac balls, bridge plugs, and caved formation from the wellbore. It’s ideal for wells where circulation is restricted, fluid loss is a concern, or conventional methods aren’t cost-effective.
How does the Bull Dog® Bailer work?
The tool is run on tubing or drill pipe. A float valve sits above your chosen bottom-hole tool, and a reciprocating pump above the float draws debris into the tubing chamber. Solids collect above the float valve while fluids discharge to the annulus. The bailer operates effectively without requiring circulation or additional surface pumping.
When should I use the Bull Dog® Bailer instead of circulating the well?
Use the Bailer when:
The well can’t be circulated
Adding fluid would damage the pay zone
The job is more cost-effective than rigging up circulation
You need to clean out or fish in low-pressure, fluid-sensitive environments
What sizes are available for the Bull Dog® Bailer?
Standard sizes range from 1.883" up to 6.5" O.D., including special models like the “Junk Sucker®” for high-volume cleanouts. Each tool can be matched with casing size and job specs, and custom configurations are available on request.
What bottom-hole tools can be run with the Bailer?
The Bull Dog® Bailer is designed to run with a variety of bottom-hole tools including:
Drill bits
Cutrite® shoes
Rotary shoes
Overshots
On/off tools
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Want To Know More About This Tool?
We are ready to help! If you're interested in one of our tools, or if you have a job in mind that needs a custom tool solution, don't hesitate to reach out and we'll be ready to get you exactly what you need - faster than you can get it anywhere else!