NQ Water Swivel Crossover Sub Alloy Steel Wireline Core Drilling Reducing Adapter

NQ Adapter sub faucet reducer (also known as a variable coupling or conversion short section) is a specialized transitional connection accessory for wireline coring drilling. It is used for screw-threaded connection between the drilling rig faucet and NQ-sized drill pipes and active drill pipes, solving the construction problem of mismatched screw threads between large-diameter HQ/PQ faucets and small and medium-sized NQ drilling tools, and inability to directly connect.
The entire product is forged and quenched from high-strength alloy steel, and then precisely machined for screw threads by CNC. It has high coaxiality, excellent sealing and pressure-bearing performance, smooth internal passage without throttling, and does not leak or lose pressure when transporting high-pressure mud. It is suitable for both clean water drilling and weighted mud wall protection processes, and is a commonly used conversion accessory for medium and shallow-hole geological exploration, mineral prospecting, and tunnel advance drilling projects.

1. Divergent Diameter Double-Threaded Integrated Structure
The two ends have different standard threads integrated together. The transition section is smooth and thickened, with strong torsional bearing capacity. It has strong high-speed rotation stability without deflection. The screw threads can be disassembled smoothly without getting stuck.
2. Integral Cast Alloy Steel Base
The raw material is formed through overall casting and then undergoes quenching and tempering heat treatment. It has strong tensile, torsion, and impact resistance. It is not prone to cracking or deformation under underground high pressure and outdoor impacts.
3. High-Precision CNC Thread Machining
It strictly follows the DCDMA international drilling standards for thread cutting. The threads are full and the clearance is uniform. The sealing is tight, and there is no water leakage or pressure relief under long-term high-pressure mud conditions.
4. Large-Diameter Smooth Internal Passage
There is no constricted structure inside. The resistance of mud circulation is small, avoiding the accumulation of rock powder and blocking the pipeline. It can continuously and stably maintain pump pressure.
5. Surface Blackening Anti-Rust Treatment
The overall surface is treated with anti-corrosion hardening. It is resistant to mud acid and alkali corrosion. It is not prone to rust, thread slippage, or breakage in humid mining areas or open-air outdoor environments over a long period of use.

1. Multi-specification compatibility in one machine, saving equipment investment
No need to replace the entire set of faucets. With HQ/PQ standard drilling rigs and NQ variable diameter connectors, NQ drill tools can be directly installed and drilled using the NQ drill bit. One drilling rig can meet the needs of multiple diameter drilling, reducing equipment idleness and procurement costs.
2. High-pressure sealing and anti-leakage, stable drilling conditions
Precise matching of threads, no water leakage or pressure relief issues during high-pressure mud operations. Stable pump pressure, effectively avoiding drill bit burnout and slow advancement due to insufficient cooling caused by water leakage.
3. High coaxiality and low vibration, protecting the entire drilling tool
Integrated precision processing ensures high coaxiality. During the rotation process, the vibration is small and the swing is slight, reducing wear and damage to the main shaft of the faucet and the drill pipe threads, and lowering the probability of stuck drill bits and thread fractures in the hole.
4. High strength, wear-resistant and durable, suitable for harsh outdoor environments
Quenched alloy steel material can withstand mining site impacts, mud erosion, and high/low temperature environments. Long-term high-frequency disassembly and assembly is not prone to thread slippage or breakage. The service life is far longer than that of ordinary lathe processing conversion connectors.
5. Quick on-site replacement, shortens process switching time
Standard universal thread structure. No need to modify equipment on-site. It takes only a few minutes to complete the disassembly and assembly of the faucet and NQ drill tools, significantly improving the continuity of drilling construction.