Rotary Drill Rod

Send Message Request a Quote

Our rotary drill rod is classified into single-layer, double-layer, and 3-layer types.

Single drill rod

Double drill rod

Triple drill rod

It incorporates both inside and outside drill pipes. A ring shaped space is formed between the pipes, working as a channel to transport flushing medium during drilling. The multiple drill rods generate multi-layer internal circulation channel, which works to deliver air and liquid, as well as to accelerate and to guarantee the flow and ejection of debris mixture. In Caston, for the purpose of improving the concentricity and sealing performance of drill pipes, the pin and box type sub joints of double-layer drill rod are formed from hot extrusion molding technique, reducing the risk of construction largely.

Double-layer drill rod structure Double drill rod structure Triple drill rod structure

Advantages

1. The well wall will almost not be impacted. The well bottom easy to leak and collapse is unaffected
2. Only little drilling fluid is needed; the drill process features little displacement, fast return, and clean well bottom
3. Rotary drill rod shows unique advantages in directional drilling, horizontal drilling, and coring operations
4. It works fast in drilling large-diameter well
5. Caston has developed new drilling technique on the basis of double-layer drill rod
6. Rotary drill rod specification: 5”5 1/2 5 7/8 6 5/8 7 5/8 8 1/2 9 1/2 10;
Steel grade: API E75, X95, G105, S135 and high-strength steels

External sealing structure is employed both for double/triple drill rod for the convenience of replacing seal rings and installation

The double-layer type drill rod is structured by internal sealing method to protect the sealing rings.

Square plugs are used for the rotation of the tongs on pipe ends to ensure that the outer pipe is connected solidly

The outer pipe end and pipe body of triple drill rod is positioned accurately, and the outer pipe is welded in butt welding technique, effectively ensuring the concentricity of drill rods

Structure of triple drill rod

API standard thread is utilized for outer pipe to connect the pipes firmly

Internal structure of double drill rod

The outer pipe is designed with the thread in line with API standards

Double-layer drill rod

Parameters

Name	Specification	Outer drill pipe (mm)				Intermediate pipe (mm)		Inner drill pipe (mm)		Max flow space (mm)
Name	Specification	thread	outer diameter	wall thickness	length	outer diameter	wall thickness	outer diameter	wall thickness	outer channel	intermediate channel	inner channel
50 single inside thickened drill pipe	Φ50×6×1.5M	corrugated buckle type	50	6	1500							38
50 single outside thickened drill pipe	Φ50×6×1.5M	square buckle type	50	6	1500							38
60 single inside thickened drill pipe	Φ60×6×1.5M	corrugated buckle type	60	6	1500							48
60 single drill pipe	Φ60×6×2M	corrugated buckle type	60	6	2000							48
60 single inside thickened drill pipe	Φ60×6×2M	corrugated buckle type	60	6	2000							48
60 single inside thickened drill pipe	Φ60×6×3M	corrugated buckle type	60	6	3000							48
60 double drill pipe	Φ60X1.5M	corrugated buckle type	60	7	1500			28	4.5	18		19
73 double drill pipe	Φ73X2M	corrugated buckle type	73	6	2000			34	4	27		26
73 double drill pipe	Φ73X3M	corrugated buckle type	73	6	3000			34	4	27		26
89 three drill pipe	Φ89×1.5M	corrugated buckle type	89	7	1500	42	4	28	4.5	47	6	19
89 three drill pipe	Φ89×2.5M	corrugated buckle type	89	7	2500	42	4	28	4.5	47	6	19
89 three drill pipe	Φ89×3M	corrugated buckle type	89	7	3000	42	4	28	4.5	47	6	19

Scan QR to Read
Links：https://www.globefindpro.com/products/21312.html