Rc Drill Rod

RC Drill Rod

Reverse circulation drill pipe, also known as double-wall drill pipe, is a type of drilling tool used for reverse circulation drilling. It is composed of inner and outer layers of drill pipe (called inner pipe and outer pipe). An annular gap is formed between the inner and outer tubes. During drilling, the circulating medium flows from the annular gap of the double-walled drill to the bottom of the hole.

The center hole of the inner tube discharges the circulating medium. And carry the core sample back to the surface. The outer tubes of each double-walled drill pipe are connected with threads to ensure the transmission of torque and pressure. The inner tubes are mostly connected by plugging, which generally functions to circulate the circulating medium, and the plugging joints are equipped with sealing devices. Reverse circulation drilling can effectively prevent well wall collapse and improve drilling efficiency.

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Main features Main Technical Parameters Structural details

Main features

Roller cone drill pipe products are made of high-quality materials, and the materials are heat treated using multi-functional integrated heat treatment equipment. All thread processing uses professional CNC processing equipment, and all thread processing and testing are equipped with professional thread gauges that comply with international industry standards. Therefore, the threads fit closely, maximizing the quality of the thread fit. Drill pipe welding methods include submerged arc welding or friction welding. Compared with ordinary welding methods, buried arc welding has deeper penetration and better weld quality after welding.

Thread	Diameter	Length	Wall thickness range
3”BECO	114.3	6100-12192	8.8-19.05
3-1/2”BECO	127	6100-12192	12.7-19.05
3-1/2”BECO	140	7620-12192	12.7-25.4
4”BECO	152	7620-12192	12.7-25.4
4”BECO	159	7620-12192	12.7-25.4
4-1/2”BECO	159	7620-12192	12.7-25.4
4”BECO	165	7620-12192	12.7-25.4
4-1/2”BECO	165	7620-12192	12.7-25.4
4”BECO	178	7620-12192	12.7-25.4
4-1/2”BECO	178	7620-12192	12.7-25.4
5-1/4”BECO	194	7620-12192	19.05-35.1
6”BECO	219	7620-12192	25.4-38.1
6”BECO	235	7620-12192	25.4-38.1
8”BECO	273	7620-12192	25.4-38.1
8”BECO	323.9	7620-12192	25.4-38.1
10”BECO	339.7	7620-12192	25.4-38.1

Main Technical Parameters

Specification	Outer tube		Inner tube
Specification	OD(mm）	wall thickness	OD(mm)	ID(mm）
89mm	89	7.5	50	40
102mm	102	8.38	50	40
114mm	114	8.56	60	50
127mm	127	8	60	49
146mm	146	10	73	62

Structural details

The plunge drill pipe is manufactured from highquality materials.

The heat treatment of the material is carried outusing an integrated multi-functional furnace.

All the thread processing is carried out by professio nal CNC machining,and the tube end of the drill body adopts an inner thickening process,which significantly enhances the strength of the weld.

After friction welding, tempering treatment is carried out.Therefore, the processed drill pipe has stable and reliable quality and a significantly extended service life.

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