Heavy Weight Drill Pipe

Heavy Weight Drill Pipe

Heavy weight drill pipeis a medium-weight drill tool similar to drill pipe,whose wall is thicker than that of drill pipe and thinner than that of drill collar. Its tube is connected with special length-added drill pipe joint(integral heavy weight drill pipe is made up of tube and tool joint). Among assemblies,it is generally added between drill pipe and drill collar to prevent sudden changes in cross-section of drill string,and reduce its fatigue. Using it to replace part of the drill collar can reduce torque, improve load,and increase drilling ability during deep well drilling;meanwhile pick-up sub and safety clamp will not be used drilling operation ,which is easy to operate and can save tripping time.It can drill in in high speed under low torque in directional wells and reduces the abrasion and fracture of string without differential pressure and sticking because of the lower steel grade than drill collar, small touching area with the well wall.

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If you are finding high quality and cheap API 7-1 Heavy Weight Drill Pip, you can choose us! We adhere to the principle of good faith cooperation and look forward to working with you as a partner!

CHEMICAL COMPOSITION

Integral heavy weight drill pipe
Size	Outer diameter	Inside diameter	Joint outer diameter	Joint inside diameter	Connecting thread	Slip max. diameter	Upset middle diameter
3 1/2	3 1/2	2 1/4	4 3/4	2 1/4	NC38	3 7/8	4	2
		2 1/16	(4 7/8, 5)	2 1/16				1 13/16
4	4	2 1/2	5 1/4	2 1/2	NC40	4 3/16	4 1/2	2 1/4
		2 9/16		2 9/16				2 5/16
4 1/2	4 1/2	2 11/16	6 1/4	2 11/16	NC46	4 11/16	5	2 7/16
		2 3/4		2 3/4				2 1/2
		2 13/16		2 13/16				2 9/16
5	5	3	6 5/8	3	NC50	5 1/8	5 1/2	2 3/4
5 1/2	5 1/2	3 1/4	7	3 1/4	5 1/2 FH	5 11/16	6	3
		3 3/8	(7 1/4, 7 1/2)	3 3/8				3 1/8
		3 7/8		3 7/8				3 5/8
		4		4				3 3/4
6 5/8	6 5/8	4	8	4	6 5/8 FH	6 15/16	7 1/8	3 3/4
		4 1/2	(8 1/4, 8 1/2)	4 1/2				4 1/4
		5		5				4 3/4

Spiral heavy weight drill pipe
Specification mm	Tube					Joint
	ID mm	Elevator upsetmm	elevator groove/Slip outside diameter mm	Screw in diametermm	Spiral groove depthmm	Thread Type	OD mm	ID mm
	54					NC38		54
				127		NC46
			127			NC50

Steel Mark	Chemical Composition%
	C	Si	Mn	P	S	Cr	Mo	Cu	Al
4145H				≤0.03	≤0.03			≤0.2
Other Elements：N≤0.015，Ni≤0.5

Yield strength		Tensile Strength		ElongationA%	HB	Charpy impactAkv J
MPa	Psi	MPa	Psi
≥758	≥110000	≥965	≥140000	≥13	285～341	≥54

Product superiority:

In the process of heat treatment, a normalizing process is added, which makes the threads more granular, increases the thread strength, and effectively improves the service life of the product.

Weld heavy weight drill pipe:

Using the current domestic and foreign advanced heat treatment technology of friction welding deformation ,and heat affected zone smaller， welding process more simple and strict welding deformation and heat treatment standard procedure qualification, tuning parameters to ensure better welding quality more stable and reliable.

Welded heavy weight drill pipe
					Type	Outer diameter		Inside diamter mm	Joint type
mm	in
MJZ29-NC31-I/II		2 7/8		NC31
MJZ35-NC38-I/II		3½		NC38(3½ IF)
MJZ40-NC40-I/II		4		NC40(4FH)
MJZ45-NC46-I/II		4½		NC46(4IF)
MJZ50-NC50-I/II	127	5		NC50(4½ IF)
MJZ55-5½ FH-I/II		5½		5½ FH
MJZ66-65/8FH-I/II		Aug-65		65/8FH
			127

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