API 7-1 Drill Collars /Spiral Drill Collars for Well Drilling

• After-sales Service: 24/7
• Warranty: 1 Years
• Manufacturing Process: CNC Milling
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: 4130
• Surface Treatment: Spray-Paint
• Operation Pressure: Atmospheric Pressure
• Material: Alloy
• Name: Drill Collar
• Color: Blue
• Transport Package: Export Packing
• Specification: 79.4mm -279.4mm
• Production Capacity: 150000
• Package Size: 500.00cm * 500.00cm * 300.00cm
• Package Gross Weight: 500.000kg

Product Description

API 7-1 Drill Collars /Spiral Drill Collars for Well Drilling

Drill Collar is the basic component in the BHA which provides weight on the bit for drilling and keeps the drillsting in tension. GM Drill Collar has been approved by the NS-1 certification, it is manufactured from 4145H modified quenched and tempered steel, strict metallurgical specifications are followed to insure that full length heat treating produces a consistent maximum depth of hardness.   Features and Benefits   A hardness range of 285 to 341 BHN and a Charpy impact value of 40 ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature;   Connections are completed(phosphate coated)to protect them from the elements after machining and to help prevent galling upon initial make-up;   Thread roots are cold rolled on API and H-90 connections;   Pressed steel thread protectors are supplied for all drill collar that are equipped with standard connections ad protectors are supplied for all drill collar that are equipped with standard connections