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Balanced drill collar (BDC)

 

УБТ

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
mminch 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
3-102

NC35
NC38

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
З-108

68

2 2/3

BDC-146

146

5 3/4

56

2 1/4

130

140

3-118
3-121
3-122

NC44
4 1/2 FH
NC46

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
3-122

NC44
NC46

71

2 13/16

BDC-165

165

6 1/2

56

2 1/4

 

 

 

 

57

2 1/4

146

152

3-121
3-122
3-133

4 1/2 FH
NC46
NC50

71

2 13/16

75

3   

76

3   

BDC-171

171

6 3/4

57

2 1/4

152

159

3-122
3-133

NC46
NC50

71

2 13/16

BDC-178

178

7   

57

2 1/4

159

168

3-133
3-147

NC50
5 1/2 FH

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
3-147

NC50
5 1/2 FH

76

3   

80

3 1/3

BDC-197

197

7 3/4

71

2 13/16

178

189

3-149
3-163

NC56
NC61

76

3   

80

3 1/3

BDC-203

203

8   

71

2 13/16

194

3-147
3-149
3-152
3-163
3-171

5 1/2 FH
NC56
6 5/8 REG
NC61
6 5/8 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
3-149
3-163
3-171

6 5/8 REG
NC56
NC61
6 5/8 FH

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
3-177

NC61
7 5/8 REG

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
3-163
3-171

NC61
6 5/8 FH

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
3-177

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
3-185

6 5/8 REG
NC70

80

3 1/3

90

3 17/32

100

3 15/16

BDC-254

254

10   

76

3   

245

3-171
3-185

6 5/8 FH
NC70

80

3 1/3

90

3 17/32

100

3 15/16

BDC-279

279

11

76

3   

245

273

3-171
3-201

6 5/8 FH
8 5/8 REG

80

3 1/3

90

3 17/32

100

3 15/16

* Other size and thread combinations are possible.

Catalogue Oilfield and drilling equipment download.



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