NQ RECOVERY TAP NW CONNECTION
The NQ rod recovery tap is a high-strength, case-hardened emergency tool designed for diamond core drilling operations. Engineered for retrieving stuck or lost NQ and NRQ drill rods in boreholes, this recovery tap features self-tapping threads and parallel walls for secure, full-penetration grip, minimizing equipment loss and downtime for drilling companies. Compatible with BQ, HQ, and PQ systems, and available in both right-hand and left-hand thread types, the NQ rod recovery tap ensures reliable and efficient rod recovery in challenging drilling environments—making it an essential core drilling accessory.
Description
The NQ rod recovery tap is a specialized emergency fishing tool widely used in mineral exploration and diamond core drilling to recover NQ or NRQ drill rods that have become stuck or lost in the borehole. When drill rods remain downhole due to breakage or jamming, the NQ recovery tap is inserted into the borehole and rotated, allowing its self-tapping threads to cut into and grip the interior of the stuck rod (often referred to as the “fish”). This secure engagement enables drilling operators to extract the rod safely, avoiding costly equipment loss and minimizing operational downtime.
Key Features and Specifications
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Design: The NQ recovery tap is manufactured with parallel walls and self-tapping threads for full penetration and a firm, secure grip on the stuck rod, ensuring improved recovery rates and longer tool life
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Thread Direction: Standard models use right-hand threads, but left-hand thread versions are available to suit specific drilling scenarios
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Size Range: Designed for rods in the 52–70 mm range, conforming to GSZ-N or similar international standards
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Material: Made from high-quality alloy steel and case-hardened to a surface hardness of 50–55 HRC, providing the strength and durability needed for tough drilling conditions
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Standardization: The NQ recovery tap is part of a standardized series that includes BQ, HQ, and PQ sizes, ensuring compatibility with a wide range of drilling systems and accessories
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Connection: Connects to BW rod pins via an adapter sub, allowing seamless integration into existing drill strings for efficient extraction operations
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Types: Available in both male (external thread) and female (internal thread or bell tap) configurations to match various rod recovery needs
Application and Importance
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Core Drilling Recovery: Essential for diamond core drilling, the NQ rod recovery tap is used to recover rods, core barrels, and other downhole tools, ensuring uninterrupted drilling progress
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Operational Flexibility: With options for both thread directions and multiple connection types, the tool adapts to different drilling scenarios and equipment setups
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Minimizing Downtime: By enabling the fast and reliable retrieval of stuck rods, the NQ recovery tap helps drilling companies avoid expensive delays and equipment replacement, making it a critical tool for cost-effective drilling operations
Summary Table
| Feature | Description |
|---|---|
| Purpose | Retrieve stuck/lost NQ drill rods |
| Thread Type | Right-hand (left-hand available) |
| Size Range | 52–70 mm (GSZ-N standard) |
| Material | High-quality alloy steel, case-hardened |
| Standard Sizes | BQ, NQ, HQ, PQ |
| Connection | Adapter sub to BW rod pins |
| Types Available | Male (external), Female (internal/bell tap) |
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The NQ rod recovery tap is an indispensable core drilling accessory for efficient and safe retrieval of stuck drill rods, ensuring minimal downtime and maximum productivity in diamond core drilling and mineral exploration projects
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