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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Drill String: Composition and Design 719<br />

Table 4-73<br />

Drill Collar Weight (Steel) [Sl] (pounds per foot)<br />

1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4<br />

Dnll<br />

Collar<br />

Drill Collar ID. in.<br />

:I? ' 1 1% 1% 1% 2 2% 2k at* 3 3% 3% 3% 4<br />

2%<br />

3<br />

3%<br />

3%<br />

3%<br />

3%<br />

4<br />

41%<br />

4 'A<br />

41%<br />

43A<br />

5<br />

5%<br />

5%<br />

5%<br />

6<br />

6%<br />

6'h<br />

6%<br />

7<br />

71%<br />

7%<br />

73A<br />

8<br />

8 %<br />

81%<br />

9<br />

9%<br />

9%<br />

10<br />

11<br />

12<br />

19 18 16<br />

21 20 18<br />

22 22 20<br />

26 24 22<br />

30 29 27<br />

35 33 32<br />

40 39 37<br />

43 41 39<br />

46 44 42<br />

51 50 48<br />

54<br />

61<br />

68<br />

75<br />

82<br />

90<br />

98<br />

107<br />

116<br />

125<br />

134<br />

144<br />

154<br />

165<br />

176<br />

187<br />

210<br />

234<br />

248<br />

261<br />

317<br />

379<br />

35<br />

37<br />

40<br />

46<br />

52<br />

59<br />

65<br />

73<br />

80<br />

88<br />

96<br />

105<br />

114<br />

123<br />

132<br />

142<br />

152<br />

163<br />

174<br />

185<br />

208<br />

232<br />

245<br />

259<br />

315<br />

377<br />

32 29<br />

35 32<br />

38 35<br />

43 41<br />

50 47<br />

56<br />

63<br />

53<br />

60<br />

70 67<br />

78 75<br />

85 83<br />

94 91<br />

102 99<br />

111 108<br />

120 117<br />

130 127<br />

139 137<br />

150 147<br />

160 157<br />

171 168<br />

182 179<br />

206 203<br />

230 227<br />

243 240<br />

257 254<br />

313 310<br />

374 371<br />

44<br />

50<br />

57<br />

64<br />

72<br />

79<br />

88<br />

96<br />

105<br />

114<br />

124<br />

133<br />

144<br />

154<br />

165<br />

176<br />

200<br />

224<br />

237<br />

251<br />

307<br />

368<br />

60<br />

67<br />

75<br />

83<br />

91<br />

100<br />

110<br />

119<br />

129<br />

139<br />

150<br />

160<br />

172<br />

195<br />

220<br />

232<br />

246<br />

302<br />

364<br />

64<br />

72<br />

80<br />

89<br />

98<br />

107<br />

116<br />

126<br />

136<br />

147<br />

158<br />

169<br />

192<br />

216<br />

229<br />

243<br />

299<br />

361<br />

60<br />

68<br />

76 72<br />

85 80<br />

93 89<br />

103 98 93 84<br />

112 108 103 93<br />

122<br />

132<br />

117<br />

128<br />

113<br />

123<br />

102<br />

112<br />

143 138 133 122<br />

154 149 144 133<br />

165 160 155 150<br />

188<br />

212<br />

184<br />

209<br />

179<br />

206<br />

174<br />

198<br />

225 221 216 211<br />

239 235 230 225<br />

295 291 286 281<br />

357 352 347 342<br />

NOTE 1: Refer to API Spec 7, Table 6.1 for API standard drill collar dimensions.<br />

NOTE 2: For apecial configurations of drill collars, consult manufacturcr for reduction in weight<br />

rock bit. If there is no tendency to cause an undersized hole, the largest drill<br />

collars that can be washed over are usually selected. The current tendency, i.e.,<br />

not to run large drill collars that cannot be washed over, seems to be obsolete.<br />

Due to considerably improved technology in drill collar manufacturing, the<br />

possibility of losing the drill collar in the hole is greatly reduced perhaps the gain<br />

in penetration rate by applying higher weight on the bit can overcome the risk<br />

of drill collar failure.<br />

In general, if the optimal drilling programs require large drill collars, the<br />

operator should not hesitate to use them.<br />

Typical hole and drill collar sizes used in soft and hard formations are listed<br />

in Table 4-74.<br />

Length of Drill Collars<br />

The length of the drill collar string should be as short as possible, but<br />

adequate to create the desired weight on bit. Ordinary drill pipe must never be<br />

used for exerting bit weight.

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