Intermediate casing

Intermediate casing functions as:

⦁ Unstable hole sections
⦁ Lost-circulation zones
⦁ Low-pressure zones
⦁ Production zones

 

It is usually set in the transition zone from normal to abnormal pressure. Any hydrocarbon zones have to be isolated by the casing cement top. Multiple intermediate strings will be needed in some wells. Some intermediate strings could also work as production strings when a liner is installed beneath them.

Intermediate casing

Intermediate casing

Drilling operations could meet lots of troublesome formations till the production zone. These troublesome formations need be isolated by the called intermediate casing. The intermediate casing joints depends on the faced problems such as: lost circulation zones, unstable shale, squeezing salts and abnormally pressured zones.

API 5CT Casing and Tubing Data Sheet

 

Casing Pipe Dimensions and Weight Chart for API round thread and buttress thread

 

 Labels Outside diameter Nominallinear mass T&C Wall thickness Inside diameter Drift diameter Calculated mass C
Plain end Mass gain or loss due to end finishing (lb)
Round thread Buttress thread
1 2.00 in lb/ft in in in lb/ft Short Long RC SCC
1 2 3 4 5 6 7 8 9 10 11 12
4 1/2 9.50 4.500 9.50 0.205 4.090 3.965 9.41 4.20
4 1/2 10.50 4.500 10.50 0.224 4.052 3.927 10.24 3.80 5.00 2.56
4 1/2 11.60 4.500 11.60 0.250 4.000 3.875 11.36 3.40 3.80 4.60 2.16
4 1/2 13.50 4.500 13.50 0.290 3.920 3.795 13.05 3.20 4.00 1.56
4 1/2 15.10 4.500 15.10 0.337 3.826 3.701 15.00 2.80 3.20 0.76
5 11.50 5.000 11.50 0.220 4.560 4.435 11.24 5.40
5 13.00 5.000 13.00 0.253 4.494 4.369 12.84 4.80 5.80 6.60 2.42
5 15.00 5.000 15.00 0.296 4.408 4.283 14.88 4.20 5.20 5.80 1.62
5 18.00 5.000 18.00 0.362 4.276 4.151 17.95 4.20 4.40 0.22
5 21.40 5.000 21.40 0.437 4.126 4.001 21.32 2.95 2.46 -1.72
5 23.20 5.000 23.20 0.478 4.044 3.919 23.11 2.30 2.05 -2.09
5 24.10 5.000 24.10 0.500 4.000 3.875 24.05 1.95 1.24 -2.94
5 1/2 14.00 5.500 14.00 0.244 5.015 4.887 13.71 5.40
5 1/2 15.50 5.500 15.50 0.275 4.950 4.825 15.36 4.80 5.80 6.40 2.10
5 1/2 17.00 5.500 17.00 0.304 4.892 4.767 16.89 4.40 5.40 5.80 1.50
5 1/2 20.00 5.500 20.00 0.361 4.778 4.653 19.83 4.40 4.60 0.30
5 1/2 23.00 5.500 23.00 0.415 4.670 4.545 22.56 3.20 3.40 0.90
5 1/2 26.80 5.500 26.80 0.500 4.500 4.375 26.72
5 1/2 29.70 5.500 29.70 0.562 4.376 4.251 29.67
5 1/2 32.60 5.500 32.60 0.625 4.250 4.125 32.57
5 1/2 35.30 5.500 35.30 0.687 4.126 4.001 35.35
5 1/2 38.00 5.500 38.00 0.750 4.000 3.875 38.08
5 1/2 40.50 5.500 40.50 0.812 3.876 3.751 40.69
5 1/2 43.10 5.500 43.10 0.875 3.750 3.625 43.26
7 17.00 7.000 17.00 0.231 6.538 6.413 16.72 10.00
7 20.00 7.000 20.00 0.272 6.456 6.331 19.56 9.40
7 23.00 7.000 23.00 0.317 6.366 6.250 22.65 8.00 10.40 11.00 1.60
7 23.00 7.000 23.00 0.317 6.366 6.241 22.65 8.00 10.40 11.00 1.60
7 26.00 7.000 26.00 0.362 6.276 6.151 25.69 7.20 9.40 9.60 0.20
7 29.00 7.000 29.00 0.408 6.184 6.059 28.75 8.00 8.20 1.20
7 32.00 7.000 32.00 0.453 6.094 6.000 31.70 6.60 6.80 2.60
7 32.00 7.000 32.00 0.453 6.094 5.969 31.70 6.60 6.80 2.60
7 35.00 7.000 35.00 0.498 6.004 5.879 34.61 5.60 5.60 3.80
7 38.00 7.000 38.00 0.540 5.920 5.795 37.29 4.40 4.20 5.20
7 42.70 7.000 42.70 0.625 5.750 5.625 42.59
7 46.40 7.000 46.40 0.687 5.625 5.500 46.36
7 50.10 7.000 50.10 0.750 5.500 5.375 50.11
7 53.60 7.000 53.60 0.812 5.376 5.251 53.71
7 57.10 7.000 57.10 0.875 5.250 5.125 57.29
9 5/8 32.30 9.625 32.30 0.312 9.001 8.845 31.06 24.40
9 5/8 36.00 9.625 36.00 0.352 8.921 8.876 34.89 23.00 32.00 31.00 6.48
9 5/8 40.00 9.625 40.00 0.395 8.835 8.750 38.97 21.40 30.00 29.00 4.48
9 5/8 40.00 9.625 40.00 0.395 8.835 8.679 38.97 21.40 30.00 29.00 4.48
9 5/8 43.50 9.625 43.50 0.435 8.755 8.599 42.73 28.20 27.20 2.68
9 5/8 47.00 9.625 47.00 0.472 8.681 8.525 46.18 26.60 25.60 1.08
9 5/8 53.50 9.625 53.50 0.545 8.535 8.500 52.90 23.40 22.40 -2.12
9 5/8 53.50 9.625 53.50 0.545 8.535 8.379 52.90 23.40 22.40 -2.12
9 5/8 58.40 9.625 58.40 0.595 8.435 8.375 57.44 21.50 20.13 -4.40
9 5/8 58.40 9.625 58.40 0.595 8.435 8.279 57.44 21.50 20.13 -4.40
9 5/8 59.40 9.625 59.40 0.609 8.407 8.251 58.70
9 5/8 64.90 9.625 64.90 0.672 8.281 8.125 64.32
9 5/8 70.30 9.625 70.30 0.734 8.157 8.001 69.76
9 5/8 75.60 9.625 75.60 0.797 8.031 7.875 75.21
13 3/8 48.00 13.375 48.00 0.330 12.715 12.559 46.02 33.20
13 3/8 54.50 13.375 54.50 0.380 12.615 12.459 52.79 30.80 40.20
13 3/8 61.00 13.375 61.00 0.430 12.515 12.359 59.50 28.40 36.80
13 3/8 68.00 13.375 68.00 0.480 12.415 12.259 66.17 25.80 33.60
13 3/8 72.00 13.375 72.00 0.514 12.347 12.250 70.67 24.20 31.60
13 3/8 72.00 13.375 72.00 0.514 12.347 12.191 70.67 24.20 31.60
18 5/8 87.50 18.625 87.50 0.435 17.755 17.567 84.59 73.60 86.40
20 94.00 20.000 94.00 0.438 19.124 18.936 91.59 47.00 61.20 54.80
20 106.50 20.000 106.50 0.500 19.000 18.812 104.23 41.60 54.80 48.40
20 133.00 20.000 133.00 0.635 18.730 18.542 131.45 30.00 40.60 35.20

 

Chemical Composition

 

Chemical Composition, mass fraction (%)
Group Grade Type C Mn Mo Cr Ni Cu P S Si
min. max. min. max. min. max. min. max. max. max. max. max. max
 

 

1

H40 0.03 0.03
J55 0.03 0.03
K55 0.03 0.03
N80 1 0.03 0.03
N80 Q 0.03 0.03
R95 0.45 1.90 0.03 0.03 0.45
 

 

2

M65 0.03 0.03
L80 1 0.43 1.90 0.25 0.35 0.03 0.03 0.45
L80 9Cr 0.15 0.30 0.60 0.90 1.10 8.00 10.00 0.50 0.25 0.02 0.01 1
L80 13Cr 0.15 0.22 0.25 1.00 12.00 14.00 0.50 0.25 0.02 0.01 1
C90 1 0.35 1.20 0.25 0.85 1.50 0.99 0.02 0.01
T95 1 0.35 1.20 0.25 0.85 0.40 1.50 0.99 0.02 0.01
C110 0.35 1.20 0.25 1.00 0.40 1.50 0.99 0.02 0.005
3 P110 0.03 0.03
4 Q125 1 0.35 1.35 0.85 1.50 0.99 0.02 0.01
  1. The carbon content for L80 may be increased up to 0,50 % maximum if the product isoil-quenched.
  2. The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the WT is less than 17,78
  3. The carbon content for R95 may be increased up to 0,55 % maximum if the product isoil-quenched.
  4. Themolybdenum content for T95 Type 1 may be decreased to 0,15 % minimum if the WT is less than 17,78
  5. For EW Grade P110, the phosphorus content shall be 0,020 % maximum, and the sulfur content 0,010 % maximum. NL = no limit. Elements shown shall be reported in product

 

Mechanical Properties

 

Mechanical Properties
Group Grade Type Total elongationunder load Yield strength MPa Tensile strength min. Hardeness max.
% min. max. MPa HRC HBW
 

 

1

H40 0.5 276 552 414
J55 0.5 379 552 517
K55 0.5 379 552 655
N80 1 0.5 552 758 689
N80 Q 0.5 552 758 689
R95 0.5 655 758 724
 

 

2

M65 0.5 448 586 586 22 235
L80 1 0.5 552 655 655 23 241
L80 9Cr 0.5 552 655 655 23 241
L80 13Cr 0.5 552 655 655 23 241
C90 1 0.5 621 724 689 25.4 255
T95 1 0.5 655 758 724 25.4 255
C110 0.7 758 828 793 30 286
3 P110 0.6 758 965 862
4 Q125 1 0.65 862 1034 931
  1. In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee
  2. No hardness limits, but the maximum variation is controlled by manufacturer acc API

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