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Technical specifications of octg casing

Date:2023-08-30View:313Tags:octg casing
Technical specifications of octg casing

Oil casing is a steel pipe used to support the walls of oil and gas wells to ensure the normal operation of the entire oil well after the drilling process and completion. Each well uses several layers of casing according to different drilling depths and geological conditions. Cement cementing is used after the casing is lowered into the well. Unlike oil pipes and drill pipes, it cannot be reused and is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes.

octg casing


(1) The domestic casing is in accordance with the regulations of SY/T6194-96, and the length of the casing is not fixed, and its range is 8-13m. But casing not shorter than 6m can be provided, and its quantity shall not exceed 20%.
(2) The inner and outer surfaces of the casing shall not have folds, hairlines, delaminations, cracks, folds and scars. These defects shall be completely removed, and the removal depth shall not exceed 12.5% of the nominal wall thickness.
(3) The outer surface of the coupling must not have defects such as folds, hairlines, separation layers, cracks, rolling folds, and scarring.
(4) The thread surface of the casing and coupling should be smooth, without burrs, tears and other defects that can interrupt the thread and affect the strength and tight connection.

Theoretical weight table of OCTG casing


Outer diameter

Theoretical weight

Wall thickness

Inside diameter

diameter

Coupling outer diameter

Thread type

Steel grade

length

139.7

5-1/2)

20.85(0.244)

23.09(15.50)

25.32(17.00)

29.79(20.00)

34.26(23.00)

6.20(0.244)

6.98(0.275)

7.72(0.304)

9.17(0.361)

10.54(0.415)

127.3(5.012)

125.7(4.950)

124.3(4.892)

121.4(4.778)

118.6(4.670)

124.1(4.887)

122.6(4.825)

121.1(4.767)

118.2(4.653)

115.4(4.545)

153.7

(6.050)

Round thread

Ladder thread

j55

n80

p110

8m-12m

(2602-39.4)

177.8

7)

25.52917.00

29.79(20.00)

34.26(23.00)

38.73(26.00)

43.20(29.00)

47.66(32.00)

52.13(35.00)

56.60(38.00)

5.87(0.231)

6.91(0.272)

8.05(0.317)

9.19(0.362)

10.36(0.408)

11.51(0.453)

12.65(0.498)

13.72(0.540)

166.1(6.538)

164.2(6.456)

161.7(6.366)

159.4(6.276)

157.1(6.180)

154.8(6.090)

152.5(6.004)

150.4(5.430)

162.9(6.413)

160.8(6.331)

158.5(6.204)

156.2(6.151)

153.9(6.059)

151.6(5.969)

149.3(5.879)

147.2(5.795)

194.5

(7.656)

Round thread

Ladder thread

j55

n80

p110

8m-12m

(2602-39.4)

219.1

8-5/8)

35.75(24.00)

41.71(28.00)

47.66(32.00)

53.62(36.00)

59.58(40.00)

6.71(0.264)

7.72(0.304)

8.94(0.352)

10.16(0.400)

11.43(0.450)

205.7(8.093)

203.7(8.020)

201.2(7.927)

198.8(7.827)

196.2(7.724)

202.5(7.972)

200.5(7.894)

198.0(7.795)

195.6(7.701)

193.0(7.598)

244.5

(9.625)

Round thread

Ladder thread

j55

n80

p110

8m-12m

(2602-39.4)

244.5

9-5/8)

48.11(32.30)

53.62(36.00)

59.58(40.00)

64.79(43.50)

70.01(47.00)

71.69(53.50)

7.92(0.312)

8.94(0.352)

10.03(0.395)

11.05(0.435)

11.99(0.472)

13.84(0.545)

228.7(9.001)

226.6(8.921)

224.4(8.835)

222.4(8.755)

220.5(8.681)

216.8(8.535)

244.7(8.845)

222.6(8.765)

220.4(8.679)

218.4(8.599)

216.5(8.525)

212.8(8.379)

269.6

(10.6250

Round thread

Ladder thread

j55

n80

p110

8m-12m

(2602-39.4)

273.0

10-3/4)

48.78(32.75)

60.32(40.50)

67.77(45.50)

75.96(51.00)

82.67(55.50)

7.09(0.279)

8.89(0.350)

10.26(0.400)

11.43(0.450)

12.57(0.495)

258.9(10.192)

255.3(10.050)

252.7(9.950)

250.2(9.850)

247.9(9.760)

254.9(10.035)

251.3(9.894)

248.8(9.794)

246.2(9.694)

243.9(9.604)

298.5

(11.752)

Round thread

Ladder thread

j55

n80

p110

8m-12m

(2602-39.4)

339.7

13-3/8)

71.50(48.00)

81.18(54.50)

90.86(61.00)

101.69(68.00)

8.38(0.330)

9.65(0.380)

10.92(0.430)

12.19(0.480)

322.9(12.715)

320.4(12.615)

317.9(12.515)

315.3(12.415)

319.0(12.559)

316.5(12.459)

313.9(12.359)

311.4(12.259)

365.1

(14.374)

Round thread

Ladder thread

j55

n80

p110

8m-12m

(2602-39.4)

73.0

2-7/8)

9.53(6.40)

11.62(7.90)

12.81(8.60)

5.51(0217)

7.01(0.276)

7.82(0.308)

62.00(2.441)

59.00(2.323)

57.40(2.259)

59.61(2.347)

56.62(2.229)

54.99(2.165)

88.9

(3.500)

Round thread

 

j55

n80

8.5m-9.5m

(27.9-31.2)

88.9

3-1/2)

11.47(7.70)

15.19(10.20)

5.49(0.216)

7.34(0.289)

77.9(3.067)

76.0(2.992)

24.25(2.943)

21.04(2.797)

107.95

(4.250)

Round thread

 

j55

n80

8.5m-9.5m

(27.9-31.2)

114.3

4-1/2)

18.77(12.60)

6.88(0.271)

100.5(3.957)

97.37(3.833)

132.08

(5.200)

Round thread

 

j55

n80

8.5m-9.5m

(27.9-31)

 

  
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