Drill Pipe and Drill Collar

Drill Collar

Specification of Drill Collar

• Material: Non magnetic steel
• Hard band: Arnco200XT ,TCS8000
• Standard: API 5DP
• RSC Type: NC26 NC31 NC38 NC40 NC46 NC50 NC55 6-5/8FH
• UPSET: EU(External upset) IU(Internal upset) IEU(Internal & External upset)
• Technical: Hot Rolled
• Surface treatment: blank oil painting
• Packing: 6/9/12 pieces in a bundle, packed with steel holder

Product features of Drill Collar

Thread type	Extranal Diameter		Internal Diameter		Length(mm)
	mm	in	mm	in
NC26-35	88.9	3 1/2	31.8	1 1/2	9150
NC35-47	120.7	4 3/4	50.8	2	9150
NC46-62(4IF)	158.8	6 1/4	71.4	2 13/16	9150/9450
NC46-65(4IF)	165.1	6 1/2	57.2	2 1/4	9150/9450

The Features of Drill Collar

• Put pressure on the drill bit
• To ensure the necessary strength of compression
• To reduce the vibration of the drill bit, swing, and beating, so that the drill work smoothly.
• In the process of drilling well deflection control.
• Tensile properties as per ASTM A – 370 0.2%  residual deformation specified test bar to configuration.
• The site of drill collars tensile test specimen should be smaller size when test specimen is cut longitudinally about 3ft (0.9 m) away the end of drill collar, the test specimen’s central line is 25 mm away surface or the wall thick center.
• Hardness test should follow the requirement of current edition ASTM A – 370, adopt Brinell Hardness ( or Rock – well – c replace) test methods in the outer diameter of drill collars.

Usage of Drill Collar

• Put pressure on the drill bit
• To ensure the necessary strength of compression
• To reduce the vibration of the drill bit, swing, and beating, so that the drill work smoothly
• In the process of drilling well deflection control

Drill Pipe

Specifications of Drill Pipe

• Standard: API 7, API 7-1 and SY/T standards.
• Certifications: ISO ,API 7-1
• Usage: One of the most important components of the drill pipe is to provide drilling bit of pressure and the drill string rigid role.

dimension in	weight 1b/ft	external diameter		thickness		steel grade	thickened form	buckle type
		in	mm	in	mm
2-3/8	6.65	2.375	60.32	0.28	7.11	E.X.G	EU	NC26(2-3/8 IF)
2-7/8	10.4	2.785	73.02	0.362	9.19	E.X.G.S	EU	NC31(2-7/8 IF)
3-1/2	13.3	3.5	88.9	0.368	9.35	E.X.G.S	EU	NC38(3-1/2 IF)
	15.5	3.5	88.9	0.449	11.4	E.X.G	EU	NC38(3-1/2 IF)
	15.5	3.5	88.9	0.449	11.4	S	EU	NC40(4 FH)

Product features of Drill Pipe

• Superior – quality green & advanced heat treatment process – high strength & high toughness (especially under low temperature);
• Smooth  and long upset transition area & strong hard banding – extended product life;
• To meet or exceed requirements of the API 5DP, API 7G, API Q1 & ISO9001;
• Equipment with advanced inspection instruments and a strictly enforced quality controlling system, the final products are guaranteed to be of superior and stable quality;
• Due to our professional technicians & product flexibility, we are capable of meeting some customer' s specitic requirements.

Drill pipe is the basic part consisting drill column, the main function is deepening well hole, transmit torque and forming drilling liquid circulation passage. Drill pipe is made by steel pipe and tool joints, steel pipe and tool joints are welded together by friction welding. Mechanical properties of steel pipe, tool joints and weld seam meet the requirement of API Spec 5DP. We could manufacture drill pipe according to the requirement of customers.