spiral drilling collar

Place of Origin: Henan, China (Mainland) Oil drilling collar: Drilling collar



Sprial Drill collars are available in standard API configurations and connections are cut in accordance with API Spec.

Sprial Drilling collarNon- magnetic Drill collars are made from Non- magnetic drill collar materials with low- strength (YDWC20- 14) by combining a proprietary chemical analysis and a rotary ha mm er forging process with low magnetic permeability excellent machine ability.



Each drill collar is fully inspected by internal inspection dept. All data obtained are recorded on the inspection certificate furnished with each drill collar. API monogram, serial number, OD, ID, type and size of connections are stamped on recessed mill flats.



Drill collars are available in lengths from 10 to 31 feet and outside diameter from 31/ 8" to 11"



Standerd Size, Bores And Connection For Drill Collars OD ID Length mm Bevel diameter mm Connection Style and Size Bending strength ratio

in mm in mm

3- 1/ 8 79. 4 1- 1/ 4 31. 8 9150 76. 2 NC23- 31 2. 57 1

3- 1/ 2 88. 9 1- 1/ 2 38. 1 9150 82. 9 NC26- 35

( 21/ 8IF) 2. 42 1

4- 1/ 8 104. 8 2 50. 8 9150 100. 4 NC31- 41

( 27/ 8IF ) 2. 43 1

4- 3/ 4 120. 7 2 50. 8 9150 114. 7 NC35- 47 2. 58 1

5 127 2- 1/ 4 57. 2 9150 121. 0 NC38- 50

( 31/ 2IF ) 2. 38 1

6 152. 4 2- 1/ 4 57. 2 9150 9450 144. 5 NC44- 60 2. 49 1

6 152. 4 2- 13/ 16 71. 4 9150 9450 144. 5 NC44- 60 2. 84 1

6- 1/ 4 158. 8 2- 1/ 4 57. 2 9150 9450 149. 2 NC44- 62 2. 91 1

6- 1/ 4 158. 8 2- 13/ 16 71. 4 9150 9450 150. 0 NC46- 62

( 4IF ) 2. 63 1

6- 1/ 2 165. 1 2- 1/ 4 57. 2 9150 9450 154. 8 NC46- 65

( 4IF) 2. 76 1

6- 1/ 2 165. 1 2- 13/ 16 71. 4 9150 9450 154. 8 NC46- 65

( 4IF ) 3. 05 1

6- 3/ 4 171. 4 2- 1/ 4 57. 2 9150 9450 159. 5 NC46- 67

( 4IF ) 3. 18 1

6- 3/ 4 171. 4 2- 13/ 16 71. 4 9150 9450 159. 5 NC50- 67

( 41/ 2IF ) 2. 37 1

7 177. 8 2- 1/ 4 57. 2 9150 9450 164. 7 NC50- 70

( 41/ 2IF ) 2. 54 1

7 177. 8 2- 13/ 16 71. 4 9150 9450 164. 7 NC50- 70

( 41/ 2IF ) 2. 73 1

7- 1/ 4 184. 2 2- 13/ 16 71. 4 9150 9450 169. 5 NC50- 72

( 41/ 2IF ) 3. 12 1

7- 3/ 4 196. 8 2- 13/ 16 71. 4 9150 9450 185. 3 NC56- 77 2. 70 1

8 203. 2 2- 13/ 16 71. 4 9150 9450 190. 1 NC56- 80 3. 02 1

8- 1/ 4 209. 6 2- 13/ 16 71. 4 9150 9450 195. 7 65/ 8REG 2. 93 1

9 228. 6 2- 13/ 16 71. 4 9150 9450 212. 7 NC61- 90 3. 17 1

9- 1/ 2 241. 3 3 76. 2 9150 9450 223. 8 75/ 8REG 2. 81 1

9- 3/ 4 247. 6 3 76. 2 9150 9450 232. 6 NC70- 97 2. 57 1

10 254 3 76. 2 9150 9450 237. 3 NC70- 100 2. 81 1

11 279. 4 3 76. 2 9150 9450 266. 7 85/ 8REG 2. 84 1