High Quality API Spec 7 Drill Collar for Oilfield

• After-sales Service: Online Support
• Warranty: 1 Year
• Material: Alloy
• Outer Diameter: 79.4~171.5in
• Yield Strength: ≥758, ≥689MPa
• Tensile Strength: ≥930MPa
• Model NO.: NC44-60 NC44-60 NC44-62 NC46-62(4IF) NC46-65(4IF)
• Elongation Ratio: ≥13%
• Brinell Hardness: 285~341hb
• Charpy Impact Energy: ≥54j
• Transport Package: Wooden Case
• Origin: Jiangsu China
• HS Code: 84304900
• Production Capacity: 1000units Per Year

Product Description

Product Outline

Drill collar is an important tool in drilling well process for onshore and offshore oilfield exploration and development.

The products conform to API Spec 7 "Regulation for Rotary Rig Equipment" and other related standards, and have obtained the certificate of authority to use API monogram.

Company can produce not only drill collar with standard tool joint thread, but also product high pressure drill collars and other special drill collar with special-purpose thread.

 

Technical Features

1. Drill collar made of the high quality alloy steel and treated by seasoning has high strength and long service life. 

2. The thread root treated by cold trundle strengthening has big bearing pressure and good anti-fatigue capability. 

3. The phosphorized or copper-plated threads are wear-resisting, good sealing property, corrosion proof, strong anti-coherency. 
 

Mechanical properties

Outer diameter mm(in)	Yield strength MPa	Tensile strength MPa	Elongation ratio %	Brinell hardness HB	Charpy impact energy J
79.4~171.5 (3 1/8~6 3/4)	≥758	≥965	≥13	285~341	≥54
177.8~279.4 (7~11)	≥689	≥930

Main parameters

Thread model	Outer diameter D mm(in)	Inside diameter mm(in)	Shoulder bevel edge diameter mm (in)	Bending strength ratio	Length mm (ft)
NC44-60	152.4(6)	71.4 (2^13/16)	144.5(5.689)	2.84:1	9150/9450 (30.5/31.5)
NC44-60	152.4(6)	Drill collar heat treatment line  57.2 (21/4)	144.5(5.689)	2.49:1
NC44-62	158.8(6^1/4)		149.2(5.874)	2.91:1
NC46-62(4IF)	158.8(6^1/4)	71.4 (2^13/16)	150.0(5.906)	2.63:1
NC46-65(4IF)	165.1(6^1/2)	57.2 (2 1/4)	154.8(6.094)	2.76:1
NC46-65(4IF)	165.12(6^1/)	71.4 (2^13/16)	154.8(6.094)	3.05:1
NC50-70(41/2IF)	177.8(7)		164.7(6.484)	2.73:1
NC56-77	196. 8(7^3/4)		185.3(7.295)	2.70:1
NC56-80	203.8(8)		190.1(7.484)	3.02:1
NC61-90	228.6(9)		212.7(8.374)	3.17:1
NC70-97	247.66 (9^3/4)	76.2 (3)	232.6(9.157)	2.57:1
NC70-100	254.0(10)		237.3(9.343)	2.81:1

 

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Q:How can I place order? 
A: You can contact us by email or social media like WhatsApp on the order detail or place order on line. 

Q:How about the payment?
A: For new clients, advance payment(30%-100% of total amount) is required, the balance need to be paid before the delivery after your inspection.

Q:How can I pay you?
A: By T/T (Telegraphic Transfer) or L/C (Letter of Credit). After you receive the PI, you can make the payment through your bank as per the terms mentioned in PI.

Q: What's the order procedure? 
A: First we discuss order details, production details by email ,TM or other social media; then we issue you an PI for your confirmation. You will be requested to make full payment or deposit before we go into production.After we get the deposit, we start to process the order. Depending on the products you order, we usually a couple of days or even moths to complete production if we don't have the items in stock. Before production has been finished, we will contact you for shipment details, and the balance payment. After payment has been settled, we shall arrange the shipment for you. 

Q: How do you deal with  defective products received by the clients? 
A:  If there are some defective items, we usually credit to our customer or replace them in next shipment.