Oilfield Drill Collar Spiral Drill Collar

• After-sales Service: 24/7
• Warranty: 12 Months
• Manufacturing Process: Forging
• Surface Treatment: Spray-Paint
• Operation Pressure: Atmospheric Pressure
• Material: Alloy Steel
• Model NO.: Boban
• Name: Heavy Weight Drill Pipe
• Diameter: 3 1/2" 4" 4 1/2" 5" 5 1/2" 6 5/8"
• Usage: Well Drilling
• Transport Package: by Container or Bulk Vessel
• Specification: As per sizes
• Trademark: BOBAN & OEM
• Origin: China
• HS Code: 8431431000
• Production Capacity: 1000 PCS Per Month

Product Description

Oilfield Drill Collar Spiral Drill Collar

Product Description

Boban series drill collar is used between the drill pipe and the bit in the drill stem. It is used to put weight on the bit so that the bit can drill.

Materials
Drill collars are manufactured from AISI 4145H modified steel, and are supplied in the "as rolled" surface finish condition. Alternative surface finishes are available.

Trepanning and Heat Treatment:
Drill collars are trepanned and drifted to API Spec 7-1. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7-1 requirements. A hardness range of 285-341, Brinell hardness and Charpy "V" notch minimum impact strength of 40 ft-lb at 70 F are guaranteed one inch below the surface.

Traceability
Drill collar material and process traceability are maintained from receipt of the mill's certified raw material to completion of manufacturing. Serial numbers are die stamped on bar bodies.
Rigid Inspection Procedures:
We inspect all our drill collars to ensure compliance with API SPEC 7-1 standards. These inspections include visual dimensional checks as well as ultrasonic inspections over the entire body of the drill collar.

Rolling
Drill collar thread roots, as well as elevator recess upper radius, are cold-rolled. Cold rolling creates a compressive recess upper radius stress condition that increases fatigue life by minimizing crack initiation.

Phosphate-coated or Copper Plating
All connections are phosphate-coated or copper plated to improve resistance to corrosion.

Slip Groove, Elevator Groove and Size
Huanjie offers optional slip and elevator recesses to improve handling efficiency and safety. Unless otherwise specified, slip and elevator recesses are machined in compliance with API spec 7-1 guidelines.

Thread Protectors:
Our company offers steel, cast steel and plastic steel thread protectors for its drill stem products.

We supply slick drill collars, spiral drill collars and non-magnetic drill collars; sizes are from 3-1/8 to 11 inches. Besides the drill collars in the table below, we can supply other drill collars at customers' request.

Detailed Photos

Product Parameters

 

Nominal size	D		d		L	DF	Bending Strength ratio
	mm	in	mm	in	mm	mm
NC31-41(2-7/8IF)	104.8	4-1/8	50.8	2	9150	100.4	2.43:1
NC35-47	120.7	4-3/4	50.8	2	9150	114.7	2.58:1
NC38-50(3-1/2IF)	127.0	5	57.2	2-1/4	9150	121.0	2.38:1
NC44-60	152.4	6	57.2	2-1/4	9150/9450	144.5	2.49:1
NC44-60	152.4	6	71.4	2-13/16	9150/9450	144.5	2.84:1
NC44-62	158.8	6-1/4	57.2	2-1/4	9150/9450	149.2	2.91:1
NC46-62(4IF)	158.8	6-1/4	71.4	2-13/16	9150/9450	150.0	2.63:1
NC46-65(4IF)	165.1	6-1/2	57.2	2-1/4	9150/9450	154.8	2.76:1
NC46-65(4IF)	165.1	6-1/2	71.4	2-13/16	9150/9450	154.8	3.05:1
NC46-67(4IF)	171.4	6-3/4	57.2	2-1/4	9150/9450	159.5	3.18:1
NC50-67(4-1/2IF)	171.4	6-3/4	71.4	2-13/16	9150/9450	159.5	2.37:1
NC50-70(4-1/2IF)	177.8	7	57.2	2-1/4	9150/9450	164.7	2.54:1
NC50-70(4-1/2IF)	177.8	7	71.4	2-13/16	9150/9450	164.7	2.73:1
NC50-72(4-1/2IF)	184.2	7-1/4	71.4	2-13/16	9150/9450	169.5	3.12:1
NC56-77	196.8	7-3/4	71.4	2-13/16	9150/9450	185.3	2.70:1
NC56-80	203.2	8	71.4	2-13/16	9150/9450	190.1	3.02:1
6-5/8REG	209.6	8-1/4	71.4	2-13/16	9150/9450	195.7	2.93:1
NC61-90	228.6	9	71.4	2-13/16	9150/9450	212.7	3.17:1
7-5/8REG	241.3	9-1/2	76.2	3	9150/9450	223.8	2.81:1
NC70-97	247.6	9-3/4	76.2	3	9150/9450	232.6	2.57:1
NC70-100	254.0	10	76.2	3	9150/9450	237.3	2.81:1