Comprehensive Technical Review of the SQY Series Full Hydraulic Truck-Mounted Water Well Drilling Rig: Multi-Strategy Formation Adaptability

In the fields of industrial and agricultural water resource development, geothermal exploration, and emergency rescue drilling, the core concerns remain drilling depth, operational efficiency, and mobility. Equally critical, however, is the equipment’s adaptability to diverse and complex geological conditions—a key metric of its true value. The SQY series full hydraulic water well drilling rig (exemplified by the SQY-800 model), mounted on a HOWO 8×4 truck chassis and integrated with a full hydraulic rotary head system, not only delivers a balanced solution for medium-to-deep water well construction at the 800-meter level but also demonstrates remarkable versatility across various formation types through its multi-process drilling capabilities.

Core Power and Transmission: Precision Control through Full Hydraulic Technology

The heart of the SQY series lies in its full hydraulic rotary head system. Compared to traditional mechanical-drive rigs, the fully hydraulic drive enables infinitely variable rotation speed control and precise feed adjustments. In terms of power reserve, the SQY-800 model is powered by a Cummins engine with a rated output of 153 kW, delivering a maximum rotary torque of 14,000 N.m. This provides a solid power foundation for executing the various drilling processes described below.

Multi-Process Drilling Capability – Adapting to Ground Conditions On the Fly

1. Standard Rotary Drilling with Alloy Bits

This is the go-to mode for stable, uniform ground—whether homogeneous rock or firm soil. Using standard alloy bits with conventional drill rods, it handles straightforward rotary drilling efficiently. It is the most cost-effective way to run the rig, covering the full 800-meter depth range and hole diameters from 140 mm up to 450 mm.

2. Percussive-Rotary Drilling for Hard Rock

This breaks rock more aggressively than straight rotary alone. Field data shows penetration rates typically fall in the 12–40 m/h range, which is on par with what you would expect from a rig in this class.

3. DTH Hammer with Follow-on Casing – For Unstable Ground

Gravel beds, fracture zones, and water-bearing sands are every driller’s headache. In these conditions, conventional drilling often leads to hole collapse before casing can be set. The SQY series addresses this by running the DTH hammer with a casing shoe that advances simultaneously with the drill string. The casing follows the bit down, supporting the borehole walls as you go.

Comprehensive Assessment

Overall, the SQY series full hydraulic water well drilling rig (represented by the SQY-800 model) is a well-defined, process-versatile medium-to-deep drilling solution. Its advantages lie not only in the combination of the proven HOWO truck-mounted platform with full hydraulic rotary head technology, but also in its comprehensive drilling process system, capable of handling a wide spectrum of conditions—from unconsolidated overburden and solid bedrock to fractured and unstable formations. Therefore, for clients seeking an efficient, cost-effective solution for medium-depth water well construction in moderately hard formations, or requiring reliable performance in mountainous and geologically complex areas, the SQY series offers a highly integrated and mobile solution. However, for exceptionally hard rock or large-diameter engineering piles, evaluation of higher-torque models would be recommended.