Concentric Casing System with Ring Bits

Overburden drilling system Concentric Casing System with Ring Bits - Revolutionizing Overburden Drilling

Our concentric casing system with ring bits represents the latest technology in overburden drilling equipment. This system is particularly suitable for work conditions with gravel and fractured layers, offering outstanding performance and efficiency.

The concentric casing system comes in two variations: the three-piece set and the two-piece set. The three-piece set comprises a central drill bit, a casing shoe, and an expansion drill bit. Meanwhile, the two-piece set consists of a concentric drill bit and an expansion sleeve (formed by compressing the expansion drill bit and casing shoe). By welding or thread connecting the casing shoe to the casing, the root canal gradually slides down as the down-the-hole hammer and central drill bit advance. This drilling tool allows construction at any angle, including horizontal, and can reach depths well beyond 100 meters. Drilling and casing are synchronized for seamless operations.

Features Stable and Reliable Performance: Our drilling tools feature a full cutting structure, enabling fast progress and precise holes.
Versatile Operation: Compared to eccentric drilling, our tools require less torque, making them suitable for vertical, horizontal, or any directional operations.
Minimized Hole Blockage: Our innovative design minimizes the likelihood of hole blockage, ensuring high debris removal efficiency. Unlocking and relocking operations are also made easy.
User-Friendly and Safe: Our drilling equipment is designed for ease of use and provides excellent safety performance, prioritizing the well-being of operators. Specifications Concentric Casing System (Three Pieces)

Model	Outer diameter (mm)	Max. wall thickness (mm)	Reamed diameter (mm)	Inner diameter of casing shoe (mm)	Max. diameter of drill bit (mm)	Hammer type	Drill pipe (mm)
SOD108	108	6	118	85	75	3 inch hammer	76
SOD114	114	6	128	90	80	3 inch hammer	76
SOD127	127	9	141	97	85	4 inch hammer	76
SOD140	140	10	154	108	95	4 inch hammer	76
SOD168	168	10	182	138	125	5 inch hammer	76/89
SOD178	178	10	192	148	135	5 inch hammer	76/89
SOD183	183	10	198	152	140	5 inch hammer	76/89
SOD194	194	10	210	164	148	6 inch hammer	89/114
SOD219	219	10	235	184	172	6 inch hammer	89/114
SOD245	245	10	261	210	192	8 inch hammer	114
SOD273	273	10	305	238	219	8 inch hammer	114
SOD323	323	10	348	294	265	10 inch hammer	114
SOD406	406	12	432	358	330	12 inch hammer	127

Concentric Casing System (Two Pieces)

Model	Outer diameter (mm)	Max. wall thickness (mm)	Reamed diameter (mm)	Inner diameter (mm)	Hammer type	Drill pipe (mm)
ROD114	114	10	124	78	3 inch hammer	76
ROD140	140	10	150	94	4inch hammer	76
ROD168	168	10	178	121	5 inch hammer	76/89
ROD178	178	10	190	138	5 inch hammer	76/89
ROD183	183	10	194	143	5 inch hammer	89/114
ROD194	194	10	203	148	6 inch hammer	89/114
ROD219	219	10	234	167	6 inch hammer	89/114
ROD245	245	10	260	194	8 inch hammer	114
ROD273	273	10	292	219	8 inch hammer	114/127
ROD323	323	10	342	270	10 inch hammer	127
ROD406	406	10	419	328	12 inch hammer	140