PQ Water Swivel Crossover Sub Alloy Steel Drilling Reducing Adapter

The PQ water swivel reducer (variable coupling, conversion short section) is a special transitional accessory for large-diameter heavy-load rotary core drilling. It is mainly used for standard thread connection between the main water swivel of the drilling rig and PQ large-diameter drill pipes， outer pipe assemblies， and deep water heads. It is suitable for the standard connection of large-diameter drilling rig systems with PQ complete sets of drilling tools， solving the problems of interface compatibility and model switching in large-diameter deep well drilling. The product adopts an overall forging and quenching process of high-strength alloy structural steel， and is precisely machined with threads according to the DCMA international standard. It has advantages such as high coaxiality， high pressure resistance， anti-torsion， and anti-leakage. The inner hole is fully through and has no throttling， ensuring smooth and stable mud circulation. It is specially designed for ultra-deep hole， high-flow， and high-pressure drilling conditions and is a necessary heavy-load conversion accessory for geothermal deep wells， deep mineral exploration， and large-scale geotechnical engineering.

- Heavy-duty integrated variable-diameter structure: The entire part is forged to be thicker, with smooth transition of standard variable-diameter threads at the top and bottom. The overall strength is high and the load-bearing capacity is large. In deep wells with high loads, the rotation is without swaying, deformation or cracking.
- High-strength quenched and tempered alloy steel material: Made from high-quality engineering alloy steel through forging and quenching and tempering heat treatment. It can resist tensile, torsion and impact, and withstand the erosion of deep well high-pressure mud and the vibration load of complex strata.
- DCDMA high-precision standard threads: Formed by CNC precision turning, with full tooth profiles and precise mating clearance. The sealing fit is high, and it does not leak water, slip or get stuck under high-pressure conditions, and is easy to disassemble and assemble.
- Large-diameter full-through inner wall: The inner wall is smooth without steps or reduced diameters, with extremely low resistance to mud flow, ensuring large flow rate for circulation and slag discharge, and suitable for continuous and stable drilling in ultra-deep holes.
- Corrosion-resistant hardened surface treatment: Overall blackening, rust prevention and hardening treatment. It is resistant to acids and alkalis, mud corrosion, and long-term exposure to the elements in the wild, significantly extending the service life.

1. Large-diameter heavy-load design, suitable for ultra-deep hole working conditions
Special optimization for PQ large-diameter, thick-walled drill pipes and ultra-deep drilling conditions. The overall wall thickness is increased, and the torsional bearing capacity is upgraded. It can withstand deep well high pressure and heavy-load rotary operations for a long time, and is suitable for geothermal and deep-mineral high-difficulty drilling.
2. High-pressure leak-proof sealing, stable pressure drilling throughout the process
Precise thread combination realizes high-pressure sealed water supply, eliminating problems of large flow rate mud leakage, pressure relief, and pressure drop at the bottom of the hole. The cooling and slag discharge at the bottom of the hole are continuous and stable, effectively avoiding deep well frequent faults such as burning the drill bit, getting stuck, and burying the drill bit.
3. High coaxiality and low vibration, protecting the entire deep well drilling tools
The integrated precision processing ensures extremely high coaxiality. The high-speed rotation and oscillation are small, and the vibration is low. This effectively reduces the wear and fatigue damage of the long deep well drill pipe column, lowers the accident rate in the hole, and saves the cost of deep well drilling.
4. Extremely durable, suitable for harsh drilling environments
The forged and quenched base material strength exceeds that of ordinary turned joints. It can withstand mining impacts, mud erosion, high and low temperature alternating conditions, and is not prone to cracking, breaking, or deformation even after long-term frequent disassembly and heavy-load use.
5. Quick disassembly and switching, improving deep well construction efficiency
Standard universal DCDMA threads. No need to modify equipment on site. It can quickly complete the connection and switching of PQ large-diameter drill tools, suitable for large-scale and long-term deep well drilling project construction.