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Impression Blocks
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The Bull Dog Impression Block is a reliable downhole diagnostic tool used to obtain a precise, dimensional imprint of a "fish" or obstruction within the wellbore. Manufactured using the highest-grade lead, our Impression Block captures the most accurate impression of the fish, helping operators determine the shape, size, and orientation of the object downhole. Designed to fit standard casing sizes and customizable to unique requirements, the Bull Dog Impression Block is built for rugged field conditions and optimal performance.
Applications
The Impression Block is essential for pinpointing unknown downhole obstructions, providing operators with a clear understanding of their shape and dimensions. It also helps detect wellbore irregularities or damage, such as deformations or marks caused by tool string impacts, enabling faster and more informed fishing decisions.
Features & Advantages
Superior Accuracy: Premium-grade lead delivers clear, detailed impressions of the fish.
Custom Fit: Available in all standard sizes for popular casing weights, with special sizes made to order.
Durability & Reliability: Engineered with robust construction to handle demanding fishing operations.
Field-Proven Design: Helps reduce guesswork, enabling faster and more efficient fishing solutions.
Versatile Applications: Effective in identifying tools, tubulars, or debris stuck in the wellbore.
12" Fishing Neck: Allows for secure and efficient retrieval of the tool.
Side Circulation Port: Provides fluid circulation while maintaining tool functionality.
Custom Manufacturing Options: Special sizes and configurations available upon request.
Lead Core Construction: Ensures dimensional accuracy and long-lasting performance.
Compatible with Standard Fishing Assemblies: Easily integrates with conventional downhole fishing tool setups.
Specifications
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Bull Dog Impression Blocks come in all the standard sizes to fit in the popular casing weights. Special sizes are no problem. All blocks have a 12" fishing necks and a side circulation port.
Frequently Asked Questions (FAQs)
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What is a Bull Dog® Impression Block used for?
Impression Blocks are used to capture an imprint of the top of a fish or obstruction in the wellbore. They're commonly run before fishing to help identify the size, shape, and position of the object — ensuring the right tool is selected for recovery.
How do Bull Dog Impression Blocks work?
The tool is lowered onto the fish and pressed firmly against it. A soft lead insert records the shape and contact area of the obstruction. Once retrieved, the impression can reveal threads, tapers, rough breaks, or offsets that guide your fishing approach.
What sizes are available for Bull Dog Impression Blocks?
Bull Dog offers Impression Blocks in all standard sizes to match popular casing weights. Blocks come with 12" fishing necks and side circulation ports for well control. Custom sizes are also available for non-standard or oversized holes.
When should I run an Impression Block in a fishing job?
Use an Impression Block when:
You need to confirm the shape or condition of a fish
You're planning to run an overshot, spear, or tap
You suspect damage or collapse at the top of the fish
You want to avoid multiple tool trips or misruns
Can Bull Dog Impression Blocks be customized for special jobs?
Yes — Bull Dog can build Impression Blocks to match non-standard casing, unique bore sizes, or specialty fishing necks. If you're working with unusual well geometry or want a specific lead hardness, we can machine the block to spec.