Double Casing

General Introduction:

The Double Head Casing Drilling Systems add flexibility to drilling in varying conditions. During drilling, water or compressed air are used as medium, and the discharge head makes the casing tube and drill rod rotate and penetrate. In addition to the benefits of increased flushing control, the inner and outer strings are able to be separately controlled, which greatly increases control over drilling operation. For deeper borehole applications the double casing drilling tools allows for a dual string drilling system with internal flushing, which maximizes the precision to target. The Double Casing Drilling method reduces risk, project time and produces optimal results. It can be widely used in drilling for grouting holes in projects such as cofferdam, foundation and geothermal well and etc..

Superdrill offers a full range of Double Head Casing Drilling Systems designed for specific drilling applications. They could be utilized in rotary-percussive mixed drilling or pure rotary only drilling.

Specification Overview:

Drill Bits:

Crown Ring Bits					Inner Bits
Casing OD		Bit OD		Thread	Bit Diameter		Thread
mm	inch	mm	inch		mm	inch
118	4 5/8	125	4 15/16	T104.2	83, 85	3 1/4, 3 3/8	R56×12.7
133	5 1/4	140, 142	5 1/2, 5 5/8	T122	99,102	3 7/8, 4	R56×12.7
133	5 1/4	152	6	T122	116	4  9/16	R78×22.56
146	5 3/4	155	6 1/8	T134	115	4 1/2	R56×12.7
165	6 1/2	172	6 3/4	T146.5	128	5  1/16	R83×22.56
168	6 5/8	175	6 7/8	T153.9	127	5	R56×12.7
216	8 1/2	225	8 1/4	T203	165	6 1/4	R120×22.56

Tool Joints:

Denomination	Outside Diameter	Effective Length
Tool Joint	73~168mm	50~100mm

Drill Pipes / Casing Tubes:

Denomination	Outside Diameter	Effective Length	Wall Thickness
Outer Tube	136~168mm	950~1950mm	10~11mm
Inner Tube	50~89mm	950~1950mm	10mm

How to order?

Crown Ring Bits: Casing OD + Bit OD + Thread Size

Inner Bits: Bit Diameter + Thread Size

Tool Joints: Diameter + Length + Thread Size

Outer/Inner Tubes: Diameter + Length + Wall Thickness + Thread Size