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Bailer Float Sub - 4.625"

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Want To Know More About This Tool?

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Bull Dog® Tool’s Bailer Subs are designed to work in conjunction with Bull Dog Tool’s Bailer and Multiplier by allowing for the removal of difficult inorganic and organic debris. The large flow-through area will allow for easy transport and removal of sand and/or other debris.  

Applications

Bull Dog® Tool’s for aiding in the removal and transport of debris from a well.

Features & Advantages

  • Full 2.125-inch I.D. to assist in capturing debris

  • Specially designed “flapper” to allow debris to pass into the debris chamber and close for easy removal.  

  • Contact your Bull Dog Tool Representatives for addition sizes.

  • Available in three different models for your application.

Specifications

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Assembly No. Part

4581 F Float Sub

 4581 B Bit Float Sub

4581 MT Mill Tooth Float Sub

1 - Lower Half

4593 F

4593 B

4593 MT

2 - Upper Half

4594 F

4594 B

4594 MT

3 - Flapper Valve

4595 F

4595 B

4595 MT

4 - O-Ring*

4596 F

4596 B

4596 MT

5 - Pivot Pin w/ Torsion Spring*

4597 F

4597 B

4597 MT

6 - Bumper Rubber*

4598 F

4598 B

4598 MT

*Redress Part

Frequently Asked Questions (FAQs)

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  1. What is the 4.625" Bailer Float Sub used for?

    The 4.625" Bailer Float Sub is a heavy-duty component used in large-diameter bailer assemblies to isolate well fluids and capture debris during non-circulating cleanout operations. It’s designed for use in 7" casing and similar large-bore well environments where maximum displacement and debris capacity are critical.


  2. What are the specifications of the 4.625" float sub?

    This model typically features:

    • O.D.: 4.625"

    • I.D.: ~2-13/16"

    • Compatible casing: 7"

    • Function: Works in tandem with the Bull Dog® Bailer or Multiplier® to enable fluid isolation and debris retention during cleanout jobs.High tensile and torque ratings ensure performance under demanding downhole conditions.


  3. How does the flapper valve work in this model?

    The flapper valve is a one-way check mechanism that opens during the downstroke to allow debris into the tubing chamber and closes on the upstroke to prevent backflow. This design traps collected debris above the valve for removal while maintaining downhole pressure integrity — essential in fluid-sensitive or non-circulating wells.


  4. What well conditions are best suited for the 4.625" Bailer Float Sub?

    Use this tool when performing large-volume sand or debris cleanouts in wells where circulation isn’t feasible or where adding fluid would risk damage to the pay zone. It’s particularly effective post-frac, for plug recovery, or after perforation where formation cleanup is required.


  5. Is the 4.625" Bailer Float Sub available in custom specs?

    Yes — Bull Dog Tool can machine float subs to meet unique job specs including alternate connection types, internal diameters, and flapper designs. Our in-house team can match your existing string requirements or engineer a float sub to optimize performance for your specific downhole challenge.

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