WR400QS

💧 WR400QS 400 m Crawler Fully Hydraulic Water Well Drilling Rig

The WR400QS is a crawler fully hydraulic drilling rig designed for 400 m class medium-deep water well construction. Compared with 300 m and 350 m class models, it further improves drilling depth, lifting capacity, and overall load capacity, while directly supporting 6 m drill pipe. It is suitable for farmland irrigation, rural water supply, mining water supply, groundwater investigation, and medium-deep projects with higher requirements for continuous construction efficiency.

📏 400 m Drilling Depth Is More Suitable for Projects with Deeper Groundwater Levels

With a maximum drilling depth of 400 m and a drilling diameter of 105–325 mm, the WR400QS can cover more medium-deep groundwater development needs. For areas where shallow aquifers are unstable, groundwater levels are deeper, or projects require greater water-finding margin, 400 m class equipment offers greater construction space than conventional 300 m models, but the final well depth should still be determined based on local hydrogeological conditions.

🔩 6 m Drill Pipe Reduces Jointing Frequency and Improves Continuous Drilling Efficiency

This equipment directly supports 6 m drill pipe, with recommended drill pipe diameters of 89 / 102 mm. The main value of long drill pipe is reducing the frequency of adding rods, which is especially noticeable in 300–400 m class water well projects. For construction crews, fewer rod make-up and break-out operations mean less auxiliary time and can also reduce the labor burden caused by frequent handling.

💪 22 T Lifting Force Is More Suitable for Medium-Deep Drill Pipe and Casing Handling

The WR400QS provides 22 T lifting force, significantly higher than conventional small and medium water well drilling rigs. As hole depth increases, drill pipe weight, borehole wall friction, and casing weight all rise. Greater lifting capacity facilitates normal tripping, drill tool recovery, and casing handling. However, when encountering stuck pipe, hole shrinkage, or borehole wall caving, priority should still be given to solving the issue through hole cleaning and process adjustment rather than simply relying on maximum lifting force to pull forcefully.

🔄 8000 / 4000 N·m Dual-Mode Rotary System

The rotary system has a maximum torque of 8000 / 4000 N·m, corresponding to maximum speeds of 75 / 150 r/min. Low speed and high torque are more suitable for large-diameter, hard rock, and high-load conditions; higher speed is suitable for drilling stages with relatively lower resistance. On site, the appropriate mode should be selected according to hole diameter, drilling tools, and changes in rock formation, avoiding long-term fixed use of a single speed.

⚙️ 4 T Axial Pressure Combined with Fast Feed

Reference axial pressure is 4 T, fast feed speed is 56 m/min, and fast lifting speed is 29 m/min. Axial pressure is mainly used for drilling tool feed control, while fast feed and fast lifting are more used for power head return, drill pipe handling, and non-drilling actions. The actual penetration rate in rock formations still depends on the formation, bit, DTH hammer, and air compressor capacity.

💨 1.2–3.5 MPa Working Air Pressure Adapts to Medium and High Pressure DTH Hammers

When using DTH hammer drilling, the recommended working air pressure is 1.2–3.5 MPa, with air consumption of 16–55 m³/min, compatible with medium and high pressure series DTH hammers. For larger hole diameters, intact hard rock, or high-altitude conditions, whether the air compressor displacement is sufficient is often more important than simply reaching a pressure value.

🪨 Construction in Weathered Rock, Limestone, and Intact Rock Formations

After entering formations such as weathered rock, limestone, sandstone, and granite, the DTH hammer and bit can be selected according to rock hardness and hole diameter. In intact hard rock, stable air supply and reasonable rotation should be maintained, and rock cuttings at the bottom of the hole should be cleaned in time; if return cuttings decrease or air pressure is abnormal, first determine whether there is blockage, air leakage, or accumulated cuttings at the bottom of the hole.

🌧️ Soil, Clay, and Sand Layers Can Use Mud Rotary Drilling

Information shows that the WR400QS can not only use DTH hammer drilling but also supports mud rotary drilling. For soil, clay, sand layers, and other loose formations, mud circulation helps with wall protection, carrying drill cuttings, and maintaining hole diameter. When the upper overburden is thick, priority should be given to solving borehole wall stability before entering rock formations for pneumatic DTH drilling.

🧱 Reduced Feed Speed Should Be Used in Fractured Zones and Fissured Formations

Fractured zones may cause caving, air leakage, and stuck pipe. At this time, excessively fast feed should be reduced, continuous hole cleaning should be maintained, and foam, casing, or other auxiliary measures should be used according to air leakage and borehole wall conditions. If the rotational resistance of the drilling tool suddenly increases, timely determine whether there is caving or hole shrinkage in the hole.

💧 Construction Strategy for Aquifers and Strong Water Inflow Sections

After entering the main aquifer, groundwater will change cuttings discharge in the hole and the working state of the DTH hammer. The depth of the water-producing layer should be recorded in time, and air supply, hole cleaning, and casing methods should be adjusted according to water inflow. During well completion, filter pipes and water-stop sections should also be reasonably set according to the aquifer position to ensure later pumping performance.

⛏️ Mining Water Supply Is an Important Application for 400 m Class Equipment

Mining areas often require domestic water, dust suppression, equipment cleaning, and auxiliary production water. The WR400QS crawler chassis is suitable for gravel roads and generally uneven sites in mining areas, and the 400 m class drilling depth can cover deeper groundwater layers, making it especially suitable for water supply projects for mining camps, exploration bases, and open-pit mining areas.

🌾 Farmland Irrigation and Large-Scale Planting Areas

For farmland, orchards, and greenhouse planting areas with deeper groundwater levels, 400 m class drilling rigs can provide greater water-finding depth margin. The 6 m drill pipe reduces jointing frequency and is suitable for continuous construction of multiple irrigation wells. Actual well diameter and pump type should be designed separately according to expected water yield and irrigation scale.

🏠 Rural Water Supply and Water Wells in Remote Areas

In villages and remote areas where centralized water supply networks are insufficient, the WR400QS can be used for village-level water supply wells, schools, clinics, and small community groundwater development. The equipment uses diesel power and a crawler chassis, with less dependence on fixed on-site power, making it more suitable for field water well projects.

🧭 Groundwater Investigation and Hydrogeological Projects

In addition to direct well completion, the equipment can also be used for groundwater investigation and general hydrogeological drilling. Through records of formation changes, water return, water inflow, and hole depth during drilling, it can provide reference for subsequent well site selection and groundwater evaluation. If the project requires high-quality core samples, a dedicated core drilling rig should be used.

🚜 3 km/h Crawler Travel Improves Transfer Efficiency Within the Worksite

Crawler travel speed is about 3 km/h, and the maximum climbing angle is a reference value of 21°. Compared with smaller machines, the WR400QS has an overall weight of 8.6 T, so during transfer, more attention should be paid to ground bearing capacity, slope stability, and transport routes. Movement should be cautious on wet and slippery ground, soft soil, and side slopes.

🦵 1.6 m Hydraulic Outriggers Improve Drilling Stability

Hydraulic outrigger stroke is 1.6 m, which can be used for equipment leveling and stable support. The construction cycle of 400 m class drilling is longer, so equipment stability during drilling is very important. On soft ground, pads should be used to ensure even force on the outriggers and avoid long-term settlement causing tower tilt.

⚡ 103 kW Weichai Engine Provides Continuous Power

The WR400QS uses a 103 kW Weichai engine to provide power for rotation, feed, crawler travel, outriggers, and auxiliary systems. Medium-deep hole and hard rock construction lasts for a long time, so the air filter and radiator should be cleaned regularly, and attention should be paid to engine cooling and fuel quality to avoid power decline under high-load conditions.

🧵 1.5 T Auxiliary Winch for Handling Drilling Tools and Accessories

The small auxiliary winch has a lifting force of 1.5 T and can be used for handling DTH hammers, drill pipes, casing tools, and other on-site accessories. Reasonable use of the winch can reduce manual labor intensity, but the load should be controlled during lifting, and personnel should avoid standing under suspended objects or in the direction of wire rope force.

📦 8.6 T Overall Weight and Transport Planning

The overall weight is about 8.6 T, and the overall dimensions are about 6.25 × 1.7 × 2.39 m. Compared with larger deep well equipment, it still maintains a relatively compact structure, but transport requires a suitable flatbed truck, fixing points, and loading/unloading ramps. The 6 m drill pipe and other accessories should be secured separately to avoid rolling and collision during transport.

🧰 Optional Mud Pump, Centrifugal Pump, Generator, and Foam Pump

The WR400QS can be equipped with an optional mud pump, centrifugal pump, generator, and foam pump according to the project. Loose formation projects place more emphasis on mud and drainage systems, hard rock projects focus more on DTH hammers and air compressors, and formations with severe air leakage may require foam assistance. Project-based optional equipment can reduce unnecessary equipment investment.

⚠️ Construction and Maintenance Precautions

Before starting work each day, check the engine, hydraulic system, rotary head, crawler, outriggers, drill pipe, and high-pressure air hose; during DTH drilling, check DTH hammer lubrication and air compressor status; during mud drilling, pay attention to whether circulation is smooth; after construction, clean mud, dust, and rock cuttings in time, and check drill pipe threads, hydraulic joints, and wear parts.

Due to differences in actual geological conditions, downhole tools, drilling angle, and operating methods, the final drilling efficiency, drilling depth, and well completion effect should be based on on-site working conditions.

📊 Main Technical Parameters