Overburden Drilling

ODEX overburden drilling systems

ODEX systems are most economical solutions for casing drilling in average ground conditions. They are very popular with drilling contractors for casing in water wells, geothermal wells, medium mini-type grouting hole of building, dam and harbour project, and shallow micro-piling work. Because of the ingenious reaming wing, the bit is retrievable and can be used again. ODEX is ideal for short holes in homogenous overburden, thanks to outstanding advantages as simple structure, easy operation, retrievable drilling tools, long service life and good quality.

For small-hole sizes, rock drilling tools manufacturer produces the ODEX Eccentric overburden drilling System, rock drill bits starting with the ODEX90 to suit 114mm O.D. casings. This two-piece system comprises the shank bit holder and the eccentric pilot bit that is secured in the bit holder by a double interlocKing pin. This is easily removed to allow for bit sharpening or replacement. ODEX overburden drilling systems are widely used in a variety of applications from well drilling and mini pilling to rock anchoring and site investigation.

ODEX overburden drilling systems

Application Range

It is suitable for drilling water wells, geothermal wells, short micro piles ,medium mini-type grouting hole of building, dam and harbor project.

1. When drilling starts, the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly

2. When the required depth is reached, rotation is reversed carefully, whereupon the reamer swings in , allowing the drill bit assembly to be pulled up through the casing.

3. Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent.

4. Drilling continues to the desired depth in the bedrock using a conventional drilling.

Superdrill has ODEX types ranging from ODEX90 to ODEX280, produced with shanks of most of the prevailing DTH hammers sizing from 3” to 10”. They all consist of Guide Device, Casing Shoe, Eccentric Reamer, Pilot Bit, Guide Sleeve, and Locking Kits.

ODEX Type	Recommended Casing Size				Min. Wall Thickness		Pilot Bit Diameter		Reamer Diameter		For Shanks of Hammer
	Max. OD		Min. ID		Min. Wall Thickness		Pilot Bit Diameter		Reamer Diameter
	mm	inch	mm	inch	mm	inch	mm	inch	mm	inch
90	115	4 1/2	102	4	6	15/64	90	3 35/64	123	4 27/32	DHD3.5, Cop34, MISSION 30
115	142	5 19/32	125	4 59/64	7	9/32	115	4 17/32	155	6 7/64	DHD340A, SD4, QL40, Mission40
115	146	5 3/4	128	5 3/64	7	9/32	116	4 9/16	152	6	DHD340A, SD4, QL40, Mission40
140	168	6 5/8	152	5 63/64	8	5/16	140	5 1/2	189	7 7/16	DHD350R, SD5, QL50, Mission50
144	178	7	160	6 19/64	9	23/64	144	5 9/16	192	7 9/16	DHD350R, SD5, QL50, Mission50
165	196	7 23/32	183	7 13/64	6	15/64	166	6 17/32	211	8 19/64	DHD360, SD6, QL60, Mission60
180	219	8 5/8	194	7 5/8	6	15/64	179	7 3/64	232	9 1/8
190	219	8 5/8	205	8 1/16	7	9/32	191	7 1/2	236	9 19/64
190	219	8 5/8	205	8 1/16	7	9/32	191	7 1/2	236	9 19/64	DHD380, QL80, SD8, Mission 80
230	273	10 3/4	250	9 27/32	11.5	29/64	229	9 1/64	286	11 1/4
240	273	10 3/4	250	9 27/32	11.5	29/64	241	9 31/64	308	12 1/8
280	324	12 3/4	305	12	9.5	3/8	280	11 1/64	378