タイトルまたは説明

Drill Collar is the basic component in the BHA which provides weight on the bit for drilling and keeps the drillsting in tension.
 
TIANHE Drill Collar has been approved by the NS*1 certification, it is manufactured from ***5H 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 **5 to **1 BHN and a Charpy impact value of *0 ft-lbs are guaranteed at evenly distributed *6 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**0 connections;
?Pressed steel thread protectors are supplied for all drill collar that are equipped with standard connections
 
When ordering Please specify;
?Drill collar OD and ID;
?Overall length;
?Connections required (size and type);
?Special features desired, for example:
   Slick or Spiral;
   Stress Relief Features;
   Slip and/or Elevator Recess;
   Hardbanding;