Casing System (Overburden Drilling System)

Casing drilling, or casing while drilling (CwD) process, is a concept that combining two time-consuming processes, drilling and casing together, performing them at the same time. During the CwD process, powered by DTH hammer, a central piloting bit drives a ring bit to drill a hole wide enough for a casing tube to slide down, drilling and casing processes are therefore performed at the same time.

Features Complete types of drilling tools suitable for casing tubes with various diameters; Good stability and reliability granted by premium alloy steel material and fine CNC manufacturing process; Cost-effectiveness realized by mass production. Applications

Water well drilling, geothermal well drilling, foundation piling, geological prospecting, etc.

Permanent When start drilling, the central bit drives the ring set to drill a hole wide enough for casing tube to slide down. When arriving the bedrock, reverse rotation of the tools and pull out the central bit from the hole, leaving ring set in the hole. Pour concrete and proceed to the next steps Retrievable When start drilling, the central bit drives the ring set to drill a hole wide enough for casing tube to slide down. When arriving the bedrock, reverse rotation of the drill string and pull out the central bit from the hole. Pull the casing tube out with the ring set while pouring concrete. Technical Parameter Table of Standard Symmetric Casing System With Reamer for DTH hammer (Rectangle Lock) Order Guide: A B C D E

A	B	C	D		E
Outer Dia. Of	Max. Wall	Outer Dia. Of	Inner Dia. Of Ring Bit	Max. Dia. of	Suitable
Casing Tube	Thickness	Ring Bit	(mm)	Pilot Bit	hammer
(mm)	(mm)	(mm)		(mm)	(inches)
114	8	126	87	85	3.5"
127	10	138	95	94	3.5"
139.7	5	160	116.5	115	4"
152.4	5.5	170	126	124	5"
168.3	5.5	190	142	140	5"
177.8	7	200	153.5	152	6"
193.7	5.5	220	167	165	6"
219.1	6.5	246	190.5	188	6"
273	8	303	240	238	8"
323.9	10	350	282	280	10"
406	12.7	442	350	345	12"
508	12.7	545	450	445	18"
560	12.7	595	500	495	18"
610	12.7	645	550	545	18"

Industries We Serve

Our rock drilling equipment can be applied in various industries, doing rock drilling and crushing duties for digging, blasting, etc.
We mainly offer 4 series of rock drilling tools: top hammer drilling tools, down-the-hole (DTH) drilling tools, self-drilling anchor system and drag bits.

Tunnelling Water Well，Geothermal well drilling Quarry/Aggregate Mining Construction