Drill collars are made of AISI 4145H or 4145H modified alloy steel. And it is used between the drill pipe and the bit in the drill stem. The chemical composition should be controlled strictly during the refining and forging process. It is used to put weight on the bit so that the bit can drill.
Drill
Collar Number and Connection Label
OD mm
ID mm
Length m
BD mm
Referenced
bending Strength Ratio
+1.59
±152.4mm
NC23-31
79.4
31.8
9.14
76.2
2.57:1
NC26-35
88.9
38.1
9.14
82.9
2.42:1
NC31-41
104.8
50.8
9.14
/ 9.45
100.4
2.43:1
NC35-47
120.6
50.8
9.14
/ 9.45
114.7
2.58:1
NC38-50
127.0
57.2
9.14
/ 9.45
121
2.38;1
NC44-60
152.4
57.2
9.14
/ 9.45
144.5
2.49:1
NC44-60
152.4
71.4
9.14
/ 9.45
144.5
2.84:1
NC44-62
158.8
57.2
9.14
/ 9.45
149.2
2.91:1
NC46-62
158.8
71.4
9.14
/ 9.45
150
2.63:1
NC46-65
165.1
57.2
9.14
/ 9.45
154.8
2.76:1
NC46-65
165.1
71.4
9.14
/ 9.45
154.8
3.05:1
NC46-67
171.4
57.2
9.14
/ 9.45
159.5
3.18:1
NC50-70
177.8
57.2
9.14
/ 9.45
164.7
2.54:1
NC50-70
177.8
71.4
9.14
/ 9.45
164.7
2.73:1
NC50-72
184.2
71.4
9.14
/ 9.45
169.5
3.12:1
NC56-77
196.8
71.4
9.14
/ 9.45
185.3
2.70:1
NC56-80
203.2
71.4
9.14
/ 9.45
190.1
3.02:1
65/8 REG
209.6
71.4
9.14
/ 9.45
195.6
2.93:1
NC61-90
228.6
71.4
9.14
/ 9.45
212.7
3.17:1
75/8 REG
241.3
76.2
9.14
/ 9.45
223.8
2.81:1
NC70-97
247.6
76.2
9.14
/ 9.45
232.6
2.57:1
NC70-100
254.0
76.2
9.14
/ 9.45
237.3
2.81:1
85/8 REG
279.4
76.2
9.14
/ 9.45
266.7
2.84:1
SHAANXI KERGY MECHANICAL EQUIPMENT CO.,LTD
TEL: +86-29-85578975 EXT. 8002 | MOBILE: +86-18792562982
E-MAIL: sales@kergyoilfield.com
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