Downhole Drill Pipe

: http://hdddrillpipes.com/2-4-dth-drill-pipe/index.html

Features of DHT Drill Pipe

Caston manufactures DHT drill pipe with friction welding technique. The joints are given forging, and quenching and tempering treatment. Our drill pipes are fabricated from oil pipes in conformity with API standards, with the 2 pipe ends given internal thickening and heat treatment, which contributes to a steel grade of S135. Featured by high impact strength, and excellent mechanical performance, Caston DHT drill pipe is applicable in mining and water well drilling. It incorporates drill pipe and auxiliary casings.

Drill Pipe Specification

Dimension	Thread	Steel	Width of square buckle (mm )	Size of square buckle (mm )	Weight (kg)
76mm×5.5mm×3m	2-3/8REG	N80	57	45	33
76mm×4mm×3m	2-3/8REG	S135	57	45	26
89mm×6.5mm×3m	2-3/8REG	N80	65	45	47

Features of Casings

In drilling operation, casings work to protect the wall and reduce the straightness deviation. Casings with different length and diameter are prepared for different drill rigs. They are made from seamless steel pipes. For thread processing, pipes with thin wall should firstly be upset in the ends, and pipes with thick wall can be processed directly. The tubing joint generally comes with arc shape. It is also customizable upon clients' needs.

Casing Specification

Outer diameter (mm)	Inner diameter (mm)	Wall thickness (mm)	Length (mm)	Weight (mm)	Length (mm)	Weight (mm)	Length (mm)	Weight (mm)
108	93	7.5	1000	17	1500	26	2000	34
114	101	6.5	1000	16	1500	25	2000	32
127	114	6.5	1000	18	1500	28	2000	36
146	127	9.5	1000	30	1500	45	2000	60
168	149	9.5	1000	35	1500	53	2000	70
178	159	9.5	1000	38	1500	56	2000	70
193	173	10	1000	43	1500	65	2000	86
203	183	10	1000	46	1500	69	2000	92
244	224	10	1000	56	1500	84	2000	112
273	251	11	1000	69	1500	103	2000	138
323	301	11	1000	82	1500	124	2000	164
406	382	12	1000	114	1500	171	2000	228
457	433	12	1000	129	1500	194	2000	258
508	483	12.5	1000	150	1500	226	2000	300

Remark: casings are customizable upon clients' request