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Casing Swages
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Bull Dog® Casing Swages are heavy-duty tools designed to reform out-of-round, dented, or collapsed casing back to drift dimension. Precision-machined in ¼-inch increments and built from heat-treated alloy steel, these swages allow for controlled, progressive reshaping during workovers or completion prep. Ideal for restoring tool access in damaged casing, they can be custom-built for heavy-wall or specialty casing strings with unique OD/ID profiles. Each swage is built for strength, reliability, and smooth operation in tough wellbore conditions.
Key Features
Case-Hardened Steel BodyIncreases tool durability and wear resistance during aggressive re-rounding operations.
Engineered Flow ChannelsIntegrated flow paths allow fluid to bypass the tool during deployment, reducing swabbing and improving downhole stability.
Progressive Taper DesignSmooth, gradual nose taper enables easier insertion into damaged casing and more controlled reshaping.
Custom Sizes & Designs AvailableBull Dog Tool can manufacture swages to fit your specific OD/ID needs, including heavy-wall or specialty casing.
Applications
Bull Dog® Casing Swages are deployed to restore drift access in wells with collapsed, dented, or deformed casing. The long-tapered nose and hardened steel body are engineered to push through tight spots, progressively re-rounding the casing to its original shape. Ideal for prep work before running packers, plugs, or other bottom-hole assemblies in restricted wellbores.
Features & Advantages
Case-Hardened Steel BodyIncreases tool durability and wear resistance during aggressive re-rounding operations.
Engineered Flow ChannelsIntegrated flow paths allow fluid to bypass the tool during deployment, reducing swabbing and improving downhole stability.
Progressive Taper DesignSmooth, gradual nose taper enables easier insertion into damaged casing and more controlled reshaping.
Custom Sizes & Designs AvailableBull Dog Tool can manufacture swages to fit your specific OD/ID needs, including heavy-wall or specialty casing.
Specifications
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Description | O.D. (in) | O.D. (in) | O.D. (in) | O.D. (in) | O.D. (in) |
A - Swage O.D. in | 3.13 | 3.25 | 3.38 | 3.5 | 3.75 |
B - Box O.D. in | 3.125 | 3.125 | 3.375 | 3.375 | 3.375 |
C - Connection Box | 2 3/8 Reg. | 2 3/8 Reg. | 2 3/8 Reg. | 2 3/8 Reg. | 2 3/8 Reg. |
D - Fishing Neck Lengh, in | 16 | 16 | 16 | 16 | 16 |
E - Swage Length, in | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 |
F - Taper Length, in | 13.6 | 13.6 | 13.6 | 13.6 | 13.6 |
G - Overall Length, in | 38 | 38 | 38 | 38 | 38 |
H - Bore-Through I.D., in | 0.75 | 0.75 | 0.75 | 0.75 | 0.75 |
Description | O.D. (in) | O.D. (in) | O.D. (in) | O.D. (in) | O.D. (in) |
A - Swage O.D. in | 4.13 | 4.25 | 4.38 | 4.5 | 4.75 |
B - Box O.D. in | 3.125 | 3.125 | 3.125 | 3.125 | 3.5 |
C - Connection Box | 2 3/8 Reg. | 2 3/8 Reg. | 2 3/8 Reg. | 2 3/8 Reg. | 2 3/8 IF. |
D - Fishing Neck Lengh, in | 16 | 16 | 16 | 16 | 16 |
E - Swage Length, in | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 |
F - Taper Length, in | 13.6 | 13.6 | 13.6 | 13.6 | 13.6 |
G - Overall Length, in | 38 | 38 | 38 | 38 | 38 |
H - Bore-Through I.D., in | 0.75 | 1.25 | 1.25 | 1.00 | 1.25 |
Description | O.D. (in) | O.D. (in) | O.D. (in) | O.D. (in) |
A - Swage O.D. in | 5.25 | 5.50 | 5.75 | 5.875 |
B - Box O.D. in | 4.125 | 4.125 | 4.75 | 4.75 |
C - Connection Box | 2 7/8 IF | 2 7/8 IF | 3 1/2 IF | 3 1/2 IF |
D - Fishing Neck Lengh, in | 16 | 16 | 16 | 16 |
E - Swage Length, in | 8.4 | 8.4 | 8.4 | 8.4 |
F - Taper Length, in | 13.6 | 13.6 | 13.6 | 13.6 |
G - Overall Length, in | 38 | 38 | 38 | 38 |
H - Bore-Through I.D., in | 1.75 | 1.75 | 1.75 | 1.75 |
Description | O.D. (in) | O.D. (in) | O.D. (in) | O.D. (in) | O.D. (in) |
A - Swage O.D. in | 6.00 | 6.125 | 6.25 | 6.5 | 6.625 |
B - Box O.D. in | 4.75 | 4.75 | 4.75 | 4.75 | 4.75 |
C - Connection Box | 3 1/2 IF | 3 1/2 IF | 3 1/2 IF | 3 1/2 IF | 3 1/2 IF |
D - Fishing Neck Lengh, in | 16 | 16 | 16 | 16 | 16 |
E - Swage Length, in | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 |
F - Taper Length, in | 13.6 | 13.6 | 13.6 | 13.6 | 13.6 |
G - Overall Length, in | 38 | 38 | 38 | 38 | 38 |
H - Bore-Through I.D., in | 1.75 | 1.75 | 1.75 | 2.25 | 2.25 |
Description | O.D. (in) | O.D. (in) |
A - Swage O.D. in | 7.875 | 8.75 |
B - Box O.D. in | 6.25 | 6.25 |
C - Connection Box | 4 1/2 FH | 4 1/2 FH |
D - Fishing Neck Lengh, in | 16 | 16 |
E - Swage Length, in | 8.4 | 8.4 |
F - Taper Length, in | 13.6 | 13.6 |
G - Overall Length, in | 38 | 38 |
H - Bore-Through I.D., in | 3.00 | 3.00 |
**Note: Swage sizes available in 0.125’’ intervals. Other rig connections available.
Frequently Asked Questions (FAQs)
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What is a Bull Dog® Casing Swage used for?
Casing Swages are used to reform collapsed, dented, or out-of-round casing back to drift dimension. They restore tool access, allow for packer or plug setting, and prevent costly casing replacement during workover or completion prep.
How do Bull Dog Casing Swages work downhole?
The tool is run into the well on tubing or drill pipe. As it’s pushed or rotated through the damaged casing section, its gradual taper and hardened steel body mechanically expand the casing back into shape. Flow paths along the body allow bypass of fluid while swaging is performed.
What sizes are available for Bull Dog Casing Swages?
Bull Dog builds swages to fit a wide range of casing sizes in 1/4-inch diameter increments. Standard ODs range from small tubing repair up to large production casing, and custom sizes can be manufactured based on your ID/OD needs.
What makes Bull Dog’s Casing Swage design different?
Case-hardened steel construction for high strength and wear resistance
Flow courses machined into the body to allow fluid bypass
Available in custom taper lengths and non-standard diameters for difficult repair jobs
Backed by 40+ years of real field application in collapsed and ovaled casing
When should I use a swage instead of milling or pulling casing?
Use a swage when:
The damage is localized or partial (not a full collapse)
You want to restore drift without cutting or pulling casing
You need a fast, mechanical solution during workovers
You're prepping the well for packer, plug, or liner runs