Outer Tube Wrench BQ NQ HQ PQ For Wireline Core Drilling Maintenance

The external pipe wrench is a specialized field assembly tool for rope core drilling, used for disassembling, locking and removing large components such as the outer pipe assembly, outer pipe joints, handles, reamers, and drill bits of the core drilling tools. It is mainly used for the disassembly, locking and removal operations of these major components. It is compatible with the entire series of DCDMA standard drilling outer pipes, with the jaw fitting the arc-shaped structure of the outer pipe, providing stable clamping without damaging or flattening the pipe body. It is an essential heavy-duty drilling auxiliary tool for geological exploration, geothermal drilling, and soil and rock investigation sites.
Compared to the inner pipe wrench (for disassembling the inner pipe assembly), the external pipe wrench has greater torque and stronger clamping force. It is specifically designed to handle situations where the outer pipe has tight screws, is stuck by mud, or is rusted and difficult to remove, significantly improving the efficiency of maintenance of drilling tools in the field. 

Compatibility Specifications
- BQ Extension Wrench: Suitable for BQ series small external pipes, thin-walled external pipes, small drill bits and reamers for disassembly and assembly
- NQ Extension Wrench: General-purpose model for medium and small diameters, suitable for NQ standard external pipe assemblies, commonly used in routine survey sites
- HQ Extension Wrench: Mainstream model in the market, mainly used for disassembly and assembly of medium and large diameter external pipes, suitable for medium and deep hole drilling tools
- PQ Extension Wrench: Heavy-duty large-diameter model, with high torque and strong load-bearing capacity, suitable for PQ large-diameter thick-walled external pipes and deep well heavy-load drilling tools

- Forged alloy steel body, high strength and impact resistance for heavy-duty field work
- Precision curved non-damage jaw, no pipe flattening or scratching
- Extended labor-saving handle provides high torque for rusted and mud-stuck threads
- DCDMA standard size, fully compatible with all brands of wireline outer tubes
- Stable clamping performance, suitable for frequent on-site disassembly and maintenance

1. Special curved jaw design protects the outer pipe intact. Unlike ordinary flat pipe clamps, the special circular arc jaw perfectly fits the curved surface of the drill pipe, distributing the force evenly and preventing the flattening, scratching, or crushing of the outer pipe coating and pipe wall. This effectively protects expensive drilling equipment and reduces the cost of spare parts wear.
2. Heavy-duty large-torque design, specifically for difficult-to-remove threads
The outer pipe is exposed to high pressure, mud soaking, and sediment accumulation in the well, making the threads prone to seizing and rusting. This model of outer pipe clamp has a large bearing capacity and sufficient torque, enabling easy disassembly of long-stuck outer pipes, augers, and drill head components.
3. DCDMA standard size, universal for all brands
Made strictly according to international drilling outer pipe outer diameter standards, it is compatible with all brands of BQ/NQ/HQ/PQ rope core sampling assemblies from both domestic and international markets. It has strong versatility and high interchangeability.
4. Durable and robust, suitable for harsh field conditions
Resistant to bumps, mud corrosion, and temperature variations, it can adapt to mining areas, mountainous regions, and mobile field construction. It is unlikely to be damaged under long-term high-frequency operations.
5. Simple operation, single person can perform maintenance tasks
The structure is lightweight and reasonable, requiring no cooperation from multiple people. A single person can complete tasks such as outer pipe disassembly, changing drill bits, and changing augers, effectively saving construction time at the site.