Reverse Circulation Drilling Rig

Reverse circulation drilling rig

A reverse circulation drilling rig is a specialized drilling system designed for vertical or inclined boreholes, commonly used in water well drilling, geothermal projects, and mineral exploration. It operates using a reverse flow of drilling fluid to efficiently transport cuttings from the drill bit back to the surface through the inner tube of the drill pipe.

This method ensures faster penetration rates, improved sample quality, and reduced contamination, making it ideal for deep borehole applications and complex geological conditions.

Drilling depth(m):
200-700

The hole diameter (mm):
138-325

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What Is a Reverse Circulation (RC) Drill Rig?

A reverse circulation (RC) drilling rig is a specialized type of geological exploration equipment designed for efficient and accurate subsurface investigation. Commonly used in geology, mineral exploration, hydrogeology, and engineering, this rig creates boreholes beneath the surface to collect soil and rock samples, especially in deep or hard rock formations.

Unlike conventional drilling methods, the RC rig employs dual-wall drill rods: compressed air is injected between the outer and inner tubes, forcing the cuttings to travel back up through the center pipe to the surface. This reverse flow not only improves drilling speed and sample quality but also minimizes contamination, making it ideal for precise geochemical analysis.

Key applications include:

Large-diameter boreholes

Fast, deep penetration in hard ground

Rock core or chip sampling

Site surveys for mining, construction, and water resource projects

RC drilling rigs offer a reliable solution for obtaining accurate geological data and are essential tools in early-stage resource assessment and engineering site evaluation.

A reverse circulation drilling rig is a drilling equipment suitable for vertical or inclined drilling.

The reverse circulation system has a fast drilling speed and is particularly suitable for large-diameter hole construction.

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The forward and reverse cross joint, independently developed by Daswell Machinery, enables the circulating flushing medium to perform localized forward circulation to clean the hole bottom initially, then switch to reverse circulation to extract rock cuttings. This advanced drilling system achieves “three-side integration” — simultaneous drilling, borehole flushing, and core sampling — revolutionizing the traditional method where drilling and sampling were two separate processes. When operating in medium-hard or harder rock formations, the forward and reverse cross joint significantly improves drilling efficiency and reduces operational costs.

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Fast sample recovery: cuttings and samples are reversely pumped upward through the inner tube, with high recovery efficiency and less pollution.

Suitable for arid or water-scarce areas: drilling fluid can be recovered during drilling or does not rely on water circulation.

Suitable for initial mineral exploration: efficient acquisition of large quantities of samples, especially in gravel or aeolian sand formations.

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Reverse circulation drilling rig data parameters

ModelRCD-180RCRCD-220RCRCD-300RCRCD-500RC
Total Weight (kg)950098001000012000
Length × Width × Height
(Shipping status)(mm)		6350×2200×29506300×2000×25006750×2300×28007650×2250×3217
Nominal Drill Depth (m)180250250500
Drill Diameter (mm)φ100~φ350φ100~φ350φ100~φ350φ100~φ350
Drill Head Output:
Output Rotation Speed (rpm)		40/80 70/14040/80 70/14055/11030/60 52/104
Drill Head Output:
Max Output Torque (N · m)		850085001000012000
Stroke of Power Head:
Feeding (mm)		3500350035007000
Stroke of Power Head:
Thrust Force (kN)		454545100
Stroke of Power Head:
Lifting Capacity (kN)		6085150160
Engine Drive Type:
Model		CumminsCumminsCumminsCummins
Engine Drive Type:
Power		6BT-C180 / 132KW6BT-C180 / 132KW6BT-C180 / 132KW6BT-C190 / 142KW
Engine Drive Type:
Rotary Speed (rpm)		2200220022002200
Engine Drive Type:
Optional Electric Power		55+37 kW55+37 kW––
Track Chassis Base:
Width of Pedrail (mm)		400400400400
Track Chassis Base:
Walk Speed (km/h)		2222
Track Chassis Base:
Climb Ability (°)		≤ 20≤ 20≤ 20≤ 20