When selecting a water well drilling rig, it is essential to consider various factors such as drilling type, geological conditions, construction environment, and budget. The following is a systematic selection guide:

1. Define Drilling Requirements

Drilling Purpose

Domestic Water Wells: Shallow (less than 100 meters), small diameter (4–12 inches).

Agricultural irrigation/industrial water supply: Medium-deep (100–300 meters), medium diameter (8–16 inches).

Geothermal wells/oil exploration: Deep (over 300 meters), large diameter (over 16 inches).

Target Formation

Loose layers (sand, silt): Collapse prevention required; select rotary drilling rig or percussion drilling rig.

Rock layers (granite, basalt): High rock-breaking capacity required; select rotary drilling rig (core drilling) or down-the-hole hammer drilling rig.

Complex formations (gravel, sand): Casing required for wall protection; select fully hydraulic multi-functional drilling rig.

2. Key Selection Parameters

Drilling Capacity

Borehole Diameter: Select based on water demand (residential wells typically range from 6 to 12 inches).

Drilling Depth: The rated depth of the drilling rig should be 20% greater than the target depth (e.g., for a 100-meter well, select a 120-meter model).

Power System

Electric Drilling Rig: Suitable for sites with a stable power grid, low noise.

Diesel Drilling Rig: Preferred for field operations but has high fuel consumption.

Hydraulic System: Prioritize load-sensing hydraulic systems for energy efficiency and precise control.

Drilling Process

Mud Circulation: Suitable for loose formations, low-cost but high pollution risk.

Air hammer: Suitable for hard rock, requires an air compressor.

Casing follow-up: Prevents hole collapse in complex formations; select models equipped with casing drive devices.

Portability and Site

Vehicle-mounted drill rig: Easy to move, suitable for multiple well locations.

Modular drill rig: Suitable for narrow sites, but assembly takes time.

3. Precautions

Verify geological data: Confirm rock type and water level through geological reports or neighboring well data.

After-sales service: Give priority to brands with local agents to ensure the supply of spare parts.

Environmental protection requirements: In sensitive areas, choose low-noise, mud-free rotary drilling or air drilling rigs.