Balanced drill collar (BDC)
The item is designed to generate axial load at the bit and to improve strength of drilling strings. Spiral wall balanced drill collars are used to prevent sticking of tools during deep-well drilling that can result from contact area reduction between drill collar string and walls of well.
Specifications | |
---|---|
Normative documents | Technical Specifications TU Z RG 200-2003, API Spec 7-1 |
Length, mm | 4 500... 9 450 |
BDC types | A - smooth wall without grooves
B - with elevator & wedge grip grooves L - with elevator groove S - with elevator & wedge grip grooves and spiral wall SL - with elevator grooves and spiral wall SM - with wedge grip grooves and spiral wall ES - without grooves and with spiral wall /1 - mastered technology of hard-facing reinforcement |
Collar Designation | Outer Ø | Internal Ø | Ø Elevator Groove | Ø Wedge Grip Groove | Thread Type | |||
---|---|---|---|---|---|---|---|---|
mm | inch | mm | inch | mm | mm | GOST
Р50864 | API Spec 7-2 | |
BDC-79 |
79 |
3 1/3 |
32 |
1 1/4 |
65 |
73 |
З-65 |
NC23 |
BDC-89 |
89 |
3 1/2 |
38 |
1 1/2 |
73 |
82 |
З-73 |
NC26 |
BDC-95 |
95 |
3 3/4 |
32 |
1 1/4 |
З-86 |
NC31 | ||
38 |
1 1/2 | |||||||
BDC-105 |
105 |
4 1/8 |
32 |
1 1/4 |
89 |
102 | ||
38 |
1 1/2 | |||||||
46 |
1 13/16 | |||||||
51 |
2 | |||||||
57 |
2 1/4 | |||||||
BDC-108 |
108 |
4 1/4 |
32 |
1 1/4 | ||||
38 |
1 1/2 | |||||||
46 |
1 13/16 | |||||||
51 |
2 | |||||||
BDC-121 |
121 |
4 3/4 |
46 |
1 13/16 |
102 |
114 |
З-94
|
NC35
|
51 |
2 | |||||||
57 |
2 1/4 | |||||||
BDC-127 |
127 |
5 |
51 |
2 |
114 |
114 |
3-102 |
NC38 |
56 |
2 1/4 | |||||||
57 |
2 1/4 | |||||||
BDC-133 |
133 |
5 1/4 |
51 |
2 | ||||
56 |
2 1/4 | |||||||
57 |
2 1/4 |
З-102
| ||||||
68 |
2 2/3 | |||||||
BDC-146 |
146 |
5 3/4 |
56 |
2 1/4 |
130 |
140 |
3-118
|
NC44
|
57 |
2 1/4 | |||||||
68 |
2 2/3 | |||||||
71 |
2 13/16 | |||||||
75 |
3 | |||||||
BDC-152 |
152 |
6 |
56 |
2 1/4 | ||||
71 |
2 13/16 | |||||||
BDC-159 |
159 |
6 1/4 |
57 |
2 1/4 |
143 |
146 |
3-118
|
NC44
|
71 |
2 13/16 | |||||||
BDC-165 |
165 |
6 1/2 |
56 |
2 1/4 |
|
|
|
|
57 |
2 1/4 |
146 |
152 |
3-121
|
4 1/2 FH
| |||
71 |
2 13/16 | |||||||
75 |
3 | |||||||
76 |
3 | |||||||
BDC-171 |
171 |
6 3/4 |
57 |
2 1/4 |
152 |
159 |
3-122
|
NC46
|
71 |
2 13/16 | |||||||
BDC-178 |
178 |
7 |
57 |
2 1/4 |
159 |
168 |
3-133
|
NC50
|
71 |
2 13/16 | |||||||
80 |
3 1/3 | |||||||
90 |
3 17/32 | |||||||
BDC-184 |
184 |
7 1/4 |
71 |
2 13/16 |
168 |
178 |
3-133
|
NC50
|
76 |
3 | |||||||
80 |
3 1/3 | |||||||
BDC-197 |
197 |
7 3/4 |
71 |
2 13/16 |
178 |
189 |
3-149
|
NC56
|
76 |
3 | |||||||
80 |
3 1/3 | |||||||
BDC-203 |
203 |
8 |
71 |
2 13/16 |
194 |
3-147
|
5 1/2 FH
| |
76 |
3 | |||||||
80 |
3 1/3 | |||||||
90 |
3 17/32 | |||||||
100 |
3 15/16 | |||||||
BDC-210 |
210 |
8 1/4 |
71 |
2 13/16 |
178 |
194 |
3-152
|
6 5/8 REG
|
76 |
3 | |||||||
80 |
3 1/3 | |||||||
90 |
3 17/32 | |||||||
100 |
3 15/16 | |||||||
BDC-216 |
216 |
8 1/2 |
71 |
2 13/16 |
194 |
203 |
3-163
|
NC61
|
76 |
3 | |||||||
80 |
3 1/3 | |||||||
90 |
3 17/32 | |||||||
100 |
3 15/16 | |||||||
BDC-229 |
229 |
9 |
71 |
2 13/16 |
219 |
3-152
|
NC61
| |
76 |
3 | |||||||
80 |
3 1/3 | |||||||
90 |
3 17/32 | |||||||
100 |
3 15/16 | |||||||
BDC-241 |
241 |
9 1/2 |
76 |
3 |
219 |
229 |
3-171
|
6 5/8 FH 7 5/8 REG |
80 |
3 1/3 | |||||||
90 |
3 17/32 | |||||||
100 |
3 15/16 | |||||||
BDC-248 |
248 |
9 3/4 |
76 |
3 |
235 |
З-152
|
6 5/8 REG
| |
80 |
3 1/3 | |||||||
90 |
3 17/32 | |||||||
100 |
3 15/16 | |||||||
BDC-254 |
254 |
10 |
76 |
3 |
245 |
3-171
|
6 5/8 FH
| |
80 |
3 1/3 | |||||||
90 |
3 17/32 | |||||||
100 |
3 15/16 | |||||||
BDC-279 |
279 |
11 |
76 |
3 |
245 |
273 |
3-171
|
6 5/8 FH
|
80 |
3 1/3 | |||||||
90 |
3 17/32 | |||||||
100 |
3 15/16 |
* Other size and thread combinations are possible.
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