DRILL COLLAR - STANDARD AND SPIRAL
Drill Collar is the basic component in the BHA which provides weight on the bit for drilling and keeps the drill string in tension. Our Drill Collar is manufactured from AISI 4145H modified quenched and tempered steel and is heat treated
along its entire length for uniform toughness and durability. Strict metallurgical tests are performed per specifications
to ensure that the heat treatment produces consistent and maximum hardness through the depth of the bar.
Features and Benefits
●A hardness range of 285 to 341 BH N and a Charpy impact value of 40 Ibs/ft are guaranteed for evenly distributed 16 points in any cross sections at room temperature;
●Connections are phosphate coated after machining to protect the threads from corrosive elements and to 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
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 Elevato Recess;
Hardbanding;
Drill Collar Specifications
|
Number And Connection Table |
OD |
|
ID |
|
Length mm |
Bevel Diameter mm |
Bending Strength Ratio |
|
mm |
in |
mm |
in |
||||
|
NC23-31 |
79.4 |
3 1/8 |
31.8 |
1 1/4 |
9150 |
76.2 |
2.57:1
|
|
NC26-35(2 3/8 IF) |
88.9 |
3 1/2 |
38.1 |
1 7/2 |
9150 |
84.5 |
2.42.1
|
|
NC31-41(2 7/8 IF) |
104.8 |
4 1/8 |
50.8 |
2 |
9150 |
101.6 |
2.43:1 |
|
NC35-47 |
120.6 |
4 3/4 |
50.8 |
2 |
9150 |
114.7 |
2.58:1 |
|
NC38-50(3 1/2 IF) |
127 |
5 |
57.2 |
2 1/4 |
9150 |
121 |
2.38.1 |
|
NC44-60 |
152.4 |
6 |
57.2 |
2 1/4 |
9150 or 9450 |
144.5 |
2.49.1 |
|
NC44-60 |
152.4 |
6 |
71.4 |
2 13/16 |
9150 or 9450 |
144.5 |
2.84:1 |
|
NC44-62 |
158.8 |
6 1/4 |
57.2 |
2 1/4 |
9150 or 9450 |
149.2 |
291:1 |
|
NC46-62(4 IF) |
158.8 |
6 1/4 |
71.4 |
2 13/16 |
9150 or 9450 |
150 |
2.63:1 |
|
NC46-65(4 IF) |
165.1 |
6 1/2 |
57.2 |
2 1/4 |
9150 or 9450 |
154.8 |
2.76:1 |
|
NC46-65(4 IF) |
165.1 |
6 1/2 |
71.4 |
2 13/16 |
9150 or 9450 |
154.8 |
3.05:1 |
|
NC46-67(4 IF) |
171.4 |
6 3/4 |
57.2 |
2 1/4 |
9150 or 9450 |
159.5 |
3.18.1 |
|
NC50-67(4 1/2 IF) |
171.4 |
6 3/4 |
71.4 |
2 13/16 |
9150 or 9450 |
159.5 |
2.37:1 |
|
NC50-70(4 1/2 IF) |
177.8 |
7 |
57.2 |
2 1/4 |
9150 or 9450 |
164.7 |
2.54:1 |
|
NC50-70(4 1/2 IF) |
177.8 |
7 |
71.4 |
2 13-16 |
9150 or 9450 |
164.7 |
273:1 |
|
NC50-72(4 1/2 IF) |
184.2 |
7 1/4 |
71.4 |
2 13/16 |
9150 or 9450 |
169.5 |
3.12-1 |
|
NC56-77 |
196.8 |
7 3/4 |
71.4 |
2 13/16 |
9150 or 9450 |
185.3 |
2.70:1 |
|
NC56-80 |
203.2 |
8 |
71.4 |
2 13/16 |
9150 or 9450 |
190.1 |
3.02:1 |
|
6 5/8 REG |
209.6 |
8 1/4 |
71.4 |
2 13/16 |
9150 or 9450 |
195.7 |
2.93:1 |
|
NC61-90 |
228.6 |
9 |
71.4 |
2 13/16 |
9150 or 9450 |
212.7 |
3.17:1 |
|
7 5/8 REG |
241.3 |
9 1/2 |
76.2 |
3 |
9150 or 9450 |
223.8 |
2.81:1 |
|
NC70-97 |
247.6 |
9 3/4 |
76.2 |
3 |
9150 or 9450 |
232.6 |
2.57:1 |
|
NC70-100 |
254 |
10 |
76.2 |
3 |
9150 or 9450 |
237.3 |
2.81:1 |
|
8 5/8 REG |
279.4 |
11 |
76.2 |
3 |
9150 or 9450 |
266.7 |
2.84:1 |