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OCTG casing

Anson also have much experience on supply casing pipes, which will be best rate and international certificated quality. Casing is large diameter pipe that is assembled and inserted into a recently drilled section of a borehole and typically held into place with cement.

 With the casing set depths determined, hole sizes and casing sizes must follow. The hole drilled for each casing string must be large enough to easily fit the oil well casing inside it, allowing room for cement between the outside of the casing and the hole.
Figure of oil well casing

Casing design for each size is done by calculating the worst conditions that may be faced during drilling and production. Mechanical properties of designed pipes such as collapse resistance, burst pressure, and axial tensile strength must be sufficient for the worst conditions.

Application of OCTG casing:

In the planning stages of a well a drilling engineer, usually with input from geologists and others, will pick strategic depths at which the hole will need to be cased in order for drilling to reach the desired total depth. This decision is often based on subsurface data such as formation pressures, strengths, and makeup, and is balanced against the cost objectives and desired drilling strategy.

octg casing and tubing Oil well casing pipe
octg casing oil and gas connection Protection cap of tubing and casing

Specifications of oil well casing

Dimension range(OD inch):4 1/2”---30”
Dimension range(OD mm):114.3---762  
Standard: API SPEC 5CT
Main Steel Grade: H40, J55, K55, N80, N80Q, L80, T95,  P110 etc
Type of Casing:Plain, BTC, STC, LTC, Other Premium Thread.

Mechanical Properties:
Standard Grade Tensile Strength(MPa) Yield Strength(MPa) Elongation(%) Hardness
API SPEC 5CT J55 ≥517 379~552 0.5% ≤241HB
K55 ≥655 379~552 0.5%
N80 ≥689 552~758 0.5%
L80(13Cr) ≥655 552~655 0.5%
P110 ≥862 758~965 0.6%

Chemical Composition:
Standard Grade Composition(%)
C Si Mn P S Cr Ni Cu Mo V AIs
API SPEC 5CT
 
J55K55 0.34~0.39 0.20~
0.35
1.25~1.50 ≤0.020 ≤0.015 ≤0.15 ≤0.20 ≤0.20     ≤0.020
(37Mn5)
N80 0.34~0.38 0.20~
0.35
1.45~1.70 ≤0.020 ≤0.015 ≤0.15       0.11
~0.16
≤0.020
(36 Mn2V)
L80(13Cr) 0.15~0.22 ≤1.00 0.25~1.00 ≤0.020 ≤0.010 12.0~
14.0
≤0.20 ≤0.20     ≤0.020
P110 0.26~0.35 0.17~
0.37
0.40~0.70 ≤0.020 ≤0.010 0.80~
1.10
≤0.20 ≤0.20 0.15
~0.25
≤0.08 ≤0.020
(30CrMo)

Labels

Outside diameter
(d/mm)

T&C
(kg/m)

Wall thickness  
(t/mm)

Type of end-finish
1 2 J55/K55 M65 L80/R95 N80-1/Q C90/T95 P110 Q125
4-1/2 9.50 114.30 14.14 5.21 PS PS - - - - -
10.50 114.30 15.63 5.69 PSB PSB - - - - -
11.60 114.30 17.26 6.35 PSLB PLB PLB PLB PLB PLB -
13.50 114.30 20.09 7.37 - PLB PLB PLB PLB PLB -
15.10 114.30 22.47 8.56 - - - - - PLB PLB
5 11.50 127.00 17.11 5.59 PS PS - - - - -
13.00 127.00 19.35 6.43 PSLB PSLB - - - - -
15.00 127.00 22.32 7.52 PSLB PLB SLB PLB PLB PLB  
18.00 127.00 26.79 9.19 - PLB SLB PLB PLB PLB PLB
21.40 127.00 31.85 11.10 - PLB PLB PLB PLB PLB PLB
23.20 127.00 34.53 12.14 - - PLB PLB PLB PLB PLB
24.10 127.00 35.87 12.70 - - PLB PLB PLB PLB PLB
5-1/2 14.00 139.70 20.83 6.20 PS PS - - - - -
15.50 139.70 23.07 6.98 PSLB PSLB - - - - -
17.00 139.70 25.30 7.72 PSLB PLB PLB PLB PLB PLB -
20.00 139.70 29.76 9.17 - PLB PLB PLB PLB PLB -
23.00 139.70 34.23 10.54 - PLB PLB PLB PLB PLB PLB
26.80 139.70 39.88 12.70 - - - - P - -
29.70 139.70 44.20 14.27 - - - - P - -
32.60 139.70 48.52 15.88 - - - - P - -
35.30 139.70 52.53 17.45 - - - - P - -
38.00 139.70 56.55 19.05 - - - - P - -
40.50 139.70 60.27 20.62 - - - - P - -
43.10 139.70 64.14 22.22 - - - - P - -
6-5/8 20.00 168.28 29.76 7.32 PSLB PSLB - - - - -
24.00 168.28 35.72 8.94 PSLB PLB PLB PLB PLB PLB -
28.00 168.28 41.67 10.59 - PLB PLB PLB PLB PLB -
32.00 168.28 47.62 12.06 - - PLB PLB PLB PLB PLB
7 17.00 177.80 25.30 5.87 - - - - - - -
20.00 177.80 29.76 6.91 PS PS - - - - -
23.00 177.80 34.23 8.05 PSLB PLB PLB PLB PLB - -
26.00 177.80 38.69 9.19 - PLB PLB PLB PLB PLB -
29.00 177.80 43.16 10.36 - PLB PLB PLB PLB PLB -
32.00 177.80 47.62 11.51 - PLB PLB PLB PLB PLB -
35.00 177.80 52.09 12.65 - - PLB PLB PLB PLB PLB
38.00 177.80 56.55 13.72 - - PLB PLB PLB PLB PLB
42.70 177.80 63.55 15.88 - - - - P - -
46.40 177.80 69.05 17.45 - - - - P - -
50.10 177.80 74.56 19.05 - - - - P - -
53.60 177.80 79.77 20.62 - - - - P - -
57.10 177.80 84.98 22.22 - - - - P - -
7-5/8 24.00 193.68 35.72 7.62 - - - -   - -
26.40 193.68 39.29 8.33 PSLB PSLB PLB PLB PLB - -
29.70 193.68 44.20 9.52 - PLB PLB PLB PLB PLB -
33.70 193.68 50.15 10.92 - PLB PLB PLB PLB PLB -
39.00 193.68 58.04 12.70 - - PLB PLB PLB PLB PLB
42.80 193.68 63.69 14.27 - - PLB PLB PLB PLB PLB
45.30 193.68 67.42 15.11 - - PLB PLB PLB PLB PLB
47.10 193.68 70.09 15.88 - - PLB PLB PLB PLB PLB
51.20 193.68 76.20 17.45 - - - - P - -
55.30 193.68 82.30 19.05 - - - - P - -
7-3/4 46.10 196.85 68.61 15.11 - - P P P P P
8-5/8 24.00 219.08 35.72 6.71 PS PS - - - - -
28.00 219.08 41.67 7.72   PS - - - - -
32.00 219.08 47.62 8.94 PSLB PSLB - - - - -
36.00 219.08 53.58 10.16 PSLB PSLB PLB PLB PLB PLB -
40.00 219.08 59.53 11.43 - PLB PLB PLB PLB PLB -
44.00 219.08 65.48 12.70 - - PLB PLB PLB PLB -
49.00 219.08 72.92 14.15 - - PLB PLB PLB PLB PLB
9-5/8 32.30 244.48 48.07 7.92 - - - - - - -
36.00 244.48 53.58 8.94 PSLB PSLB - - - - -
40.00 244.48 59.53 10.03 PSLB PSLB PLB PLB PLB - -
43.50 244.48 64.74 11.05 - PLB PLB PLB PLB PLB -
47.00 244.48 69.95 11.99 - PLB PLB PLB PLB PLB PLB
53.50 244.48 79.62 13.84 - - PLB PLB PLB PLB PLB
58.40 244.48 86.91 15.11 - - PLB PLB PLB PLB PLB
59.40 244.48 88.40 15.47 - - - - P - -
64.90 244.48 96.58 17.07 - - - - P - -
70.30 244.48 104.62 18.64 - - - - P - -
75.60 244.48 112.51 20.24 - - - - P - -
10-3/4 32.75 273.05 48.74 7.09 - - - - - - -
40.50 273.05 60.27 8.89 PSB PSB - - - - -
45.50 273.05 67.71 10.16 PSB PSB - - - - -
51.00 273.05 75.90 11.43 PSB PSB PSB PSB PSB PSB -
55.50 273.05 82.60 12.57 - PSB PSB PSB PSB PSB -
60.70 273.05 90.33 13.84 - - - - PSB PSB PSB
65.70 273.05 97.77 15.11 - - - - PSB PSB PSB
73.20 273.05 108.94 17.07 - - - - P - -
79.20 273.05 117.87 18.64 - - - - P - -
85.30 273.05 126.94 20.24 - - - - P - -
11-3/4 42.00 298.45 62.50 8.46 - - - - - - -
47.00 298.45 69.95 9.53 PSB PSB - - - - -
54.00 298.45 80.36 11.05 PSB PSB - - - - -
60.00 298.45 89.29 12.42 PSB PSB PSB PSB PSB PSB PSB
65.00 298.45 96.73 13.56 - - P P P P P
71.00 298.45 105.66 14.78 - - P P P P P
13-3/8 48.00 339.72 71.43 8.38 - - - - - - -
54.50 339.72 81.11 9.65 PSB PSB - - - - -
61.00 339.72 90.78 10.92 PSB PSB - - - - -
68.00 339.72 101.20 12.19 PSB PSB PSB PSB PSB PSB -
72.00 339.72 107.15 13.06 - - PSB PSB PSB PSB PSB
16 65.00 406.40 96.73 9.53 - - - - - - -
75.00 406.40 111.62 11.13 PSB PSB - - - - -
84.00 406.40 125.01 12.57 PSB PSB - - - - -
109.00 406.40 162.21 16.66 P - P P - P P
18-5/8 87.50 473.08 130.22 11.05 PSB PSB - - - - -
20 94.00 508.00 139.89 11.13 PSLB PSLB - - - - -
106.50 508.00 158.49 12.70 PSLB PSLB - - - - -
133.00 508.00 197.93 16.13 PSLB - - - - - -

* P - plain end, S - short round thread, B - buttress, L - long round thread.

Please follow us to know how the casing pipes produced as below details:

Productive process of OCTG casing pipe

Workshop of oil casing Raw materials of oil well casing
Workshop Raw materials
Ingot heating of oil casing Hot rolling of well casing
Ingot heating Hot rolling
Octg casing plug mill Cooling of oil well casing pipe
Plug mill Cooling
Cutting of tubing and casing Threading of oil well pipe
Cutting Threading
Casing pipe painting Hydraulic press of oil casing
Painting Hydraulic pressure

Oil well casing quality assurance

Our mill has built a complete and effective quality system under ISO9001. With the approval of American Petroleum institute, our mill is awarded with API5 CT certificate.
Casing pipes we offered conform to international standard API/ EN/ ASTM, and can pass any third party’s inspection like SGS, BV. In order to assure compliance to applicability terms, we inspect the pipes through a set of proven tests & inspections including: dimensional inspections, tensile test, corrosion test, non-destructive test, hydrostatic test, x-ray test.

Hardness detector of oil well casing pipe Casing pipe quality test
Detection of well casing pipe Testing for oil casing pipes
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