OCTG PIPE-OCTG CASING AND TUBING size chart(OIL AND GAS)

API 5CT N80

OCTG Meaning

OCTG, or oil country tubular goods, refers to a variety of steel products that are used in the drilling and extraction of oil and gas. The API 5CT standard covers a wide range of OCTG products, including tubing, casing, and couplings. OCTG products are essential for the safe and efficient operation of oil and gas wells. 

The API 5CT standard helps to ensure that OCTG products meet the highest standards of quality and safety. It includes requirements for material quality, dimensions, strength, threading, and testing. The API 5CT standard is an important part of the oil and gas industry, and it helps to ensure that OCTG products are safe for use in petroleum operations.

Production Standards of OCTG

API 5CT is the American Petroleum Institute’s specification for oil and gaswell casing and tubing. The specification covers coupling, threading, dimensions and other mechanical properties for oil and gas industry products like casing and tubing. API 5CT is the most common standard used in oil and gas industry applications. The specification covers several grades of steel, including J55, K55, N80, L80 and P110. Coupling is a threaded connection used to join oil and gas well casing or tubing. Threading refers to the process of cuttinng threads into the end of a pipe or coupling. Dimensions vary depending on the type of casing or tubing being used. American Petroleum Institute standards are voluntary consensus standards that are not mandated by law. However, oil and gas companies often require that products used in their operations meet API standards.

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Dimensions of OCTG size cHART (Tubing and Casing)

- Specification & Size of OCTG Tubing Size

DNO. D.WeightW. T.End Processing
Non-upsetUpsetSteel Grade
coupling-threadcoupling-thread
Inchmmlb./ft.lb./ft.InchmmH40J55L80N80C90T95P110
2 3/82.37560.3240.1674.24PUPNPNPNPNPN
4.64.70.194.83PNUPNUPNUPNUPNUPNUPNU
5.85.950.2546.45PNUPNUPNUPNUPNU
6.60.2957.49PPP
7.357.450.3368.53PUPUPU
2 7/82.87573.026.46.50.2175.51PNUPNU
7.87.90.2767.01
8.68.70.3087.82PLBPLBPLBEPLB
9.359.450.348.64PLBPLBPLBEPLB
10.50.3929.96PLBPLBPLBPLB
11.50.4411.18PLB 
3 1/23.588.97.70.2165.49PNPNPNPNPNPN
9.29.30.2546.45PNUPNUPNUPNUPNUPNUPNU
10.20.2897.34PNPNPNPNPNPN
12.712.950.3759.52PNUPNUPNUPNUPNU
14.30.4310.92PPP
15.50.47612.09PPP
170.5313.46PPP
44101.69.50.2265.74PNPNPNPNPNPN
110.2626.65PUPUPUPUPUPU
13.20.338.38PPP
16.10.41510.54PPP
18.90.512.7PPP
22.20.6115.49PPP
4 1/24.5114.312.612.750.2716.88PNUPNUPNUPNUPNUPNU
15.20.3378.56PPP
170.389.65PPP
18.90.4310.92PPPPLB
21.50.512.7PPPPLB
23.70.5614.22PPPPLB
26.10.6316PPPPLB
P——Plain;N—— Non-upset coupling-thread;U—— Upset coupling-thread; L——Integral

- Specification & Size of OCTG Steel Casing Pipe Size

DN O. D. Weight W. T. End Machining Form
Steel Grade
Inch mm lb/ft kg/m Inch mm H40 J55 L80 N80 C90 P110
K55 T95
4 1/2 4.5 114.3 9.5 14.14 0.205 5.21 PS PS
10.5 15.63 0.224 5.69 PSB
11.6 17.26 0.25 6.35 PSLB PLB PLB PLB PLB
13.5 20.09 0.29 7.37 PLB PLB PLB PLB
15.1 22.47 0.337 9.56 PLB
5 5 127 11.5 17.11 0.22 5.59 PS
13 19.35 0.253 6.43 PSLB
15 22.32 0.296 7.52 PSLB PLB PLB PLBE PLB
18 26.79 0.362 9.19 PLB PLB PLBE PLB
21.4 31.85 0.437 11.1 PLB PLB PLB PLB
23.2 34.53 0.478 12.14 PLB
24.1 35.86 0.5 12.7 PLB
5 1/2 5.5 139.7 14 20.83 0.244 6.2 PS PS
15.5 23.07 0.275 6.98 PSLB
17 25.3 0.304 7.72 PSLB PLB PLB PLBE PLB
20 29.76 0.361 9.17 PLB PLB PLBE PLB
23 34.23 0.415 10.54 PLB PLB PLBE PLB
26.8 39.88 0.5 12.7
29.7 44.2 0.562 14.27
32.6 48.51 0.625 15.88
35.3 52.53 0.687 17.45
38 56.55 0.75 19.05
40.5 60.27 0.812 20.62
43.1 64.14 0.875 22.22
6 5/8 6.625 168.28 20 29.76 0.288 7.32 PS PSLB
24 35.72 0.352 8.94 PSLB PLB PLB PLBE PLB
28 41.67 0.417 10.59 PLB PLB PLBE PLB
32 47.62 0.475 12.06 PLB PLB PLBE PLB
7 7 177.8 17 25.3 0.231 5.87 PS
20 29.76 0.272 6.91 PS PS
23 34.23 0.317 8.05 PSLB PLB PLB PLBE
26 38.69 0.362 9.19 PSLB PLB PLB PLBE PLB
29 43.16 0.408 10.36 PLB PLB PLBE PLB
32 47.62 0.453 11.51 PLB PLB PLBE PLB
35 52.09 0.498 12.65 PLB PLB PLBE PLB
38 56.55 0.54 13.72 PLB PLB PLBE PLB
42.7 63.54 0.625 15.88
46.4 69.05 0.687 17.45
50.1 74.56 0.75 19.05
53.6 79.77 0.812 20.62
57.1 84.97 0.875 22.22
7 5/8 7.625 193.68 24 35.72 0.3 7.62 PS
26.4 39.29 0.328 8.33 PSLB PLB PLB PLBE PLB
29.7 44.2 0.375 9.52 PLB PLB PLBE PLB
33.7 50.15 0.43 10.92 PLB PLB PLBE PLB
39 58.05 0.5 12.7 PLB PLB PLBE PLB
42.8 63.69 0.562 14.27 PLB PLB PLB PLB
45.3 67.41 0.595 15.11 PLB PLB PLB PLB
47.1 70.09 0.625 15.88 PLB PLB PLB PLB
51.2 76.19 0.687 17.45
55.3 80.3 0.75 19.05
 8 5/8 8.625 219.08 24 35.72 0.264 6.71 PS
28 41.62 0.304 7.72 PS
32 47.62 0.352 8.94 PS PSLB
36 53.57 0.4 10.16 PSLB PLB PLB PLBE PLB
40 59.53 0.45 11.43 PLB PLB PLBE PLB
44 65.48 0.5 12.7 PLB PLB PLBE PLB
49 72.92 0.557 14.15 PLB PLB PLBE PLB
 9 5/8 9.625 244.48 32.3 48.07 0.312 7.92 PS
36 53.57 0.352 8.94 PS PSLB
40 59.53 0.395 10.03 PSLB PLB PLB PLBE
43.5 64.73 0.435 11.05 PLB PLB PLBE PLB
47 69.94 0.472 11.99 PLB PLB PLBE PLB
53.5 79.62 0.545 13.84 PLB PLB PLBE PLB
58.4 86.91 0.595 15.11 PLB PLB PLB PLB
59.4 88.4 0.609 15.47
64.9 96.58 0.672 17.07
70.3 104.62 0.734 18.64
75.6 112.5 0.797 20.24
 10 3/4 10.75 273.05 32.75 48.74 0.279 7.09 PS
40.5 60.27 0.35 8.89 PS PSB
15.5 67.71 0.4 10.16 PSB
51 75.9 0.45 11.43 PSB PSB PSB PSBE PSB
55.5 82.59 0.495 12.57 PSB PSB PSBE PSB
60.7 90.33 0.545 13.84 PSBE PSB
65.7 97.77 0.595 15.11 PSB PSB
73.2 108.93 0.672 17.07
79.2 117.86 0.734 18.64
85.3 126.94 0.797 20.24
 11 3/4 11.75 42 62.5 0.333 8.46 PS
47 69.94 0.375 20.24
54 80.36 0.435 8.46
60 89.29 0.489 9.53
65 96.73 0.534 11.05
71 105.66 0.582 14.42
 13 3/8 13.375 339.73 48 71.43 0.33 8.38 PS
54.5 81.1 0.38 9.65 PSB
61 90.78 0.43 10.92 PSB
68 101.19 0.48 12.19 PSB PSB PSB PSB PSB
72 107.15 0.514 13.06 PSB PSB PSB PSB
16 16 406.4 65 96.73 0.375 9.53 PS
75 111.61 0.438 11.13 PSB
84 125.01 0.495 12.57 PSB
109 162.21 0.656 16.66 P P P P
 18 5/8 18.625 473.08 87.5 130.21 0.435 11.05 PS PSB
20 20 508 94 139.89 0.438 11.13 PSL PSLB
106.5 158.49 0.5 12.7 PSLB
133 197.93 0.635 16.13 PSLB
P——Plain;S——Short-thread;L——Long-thread;B——Buttress thread;E——Extreme thread

Chemical Composition of OCTG

GroupSteelTypeCMnMoCrNiCuPSSi
Grademin.max.min.max.min.max.min.max.min.max.max.max.max.
1H400.030.03
J550.030.03
K550.030.03
N8010.030.03
Q0.030.03
2M650.030.03
L8010.431.90.250.350.030.030.5
9Cr0.150.30.60.91.18100.50.250.020.011
13Cr0.150.220.25112140.50.250.020.011
C9010.351.20.250.851.50.990.020.01
20.51.9NLNL0.990.030.01
C950.451.90.030.030.5
T9510.351.20.250.850.41.50.990.020.01
20.51.90.990.030.01
3P1100.030.03
4Q12510.351.350.851.50.990.020.01
20.351NLNL0.990.020.02
30.51.9NLNL0.990.030.01
40.51.9NLNL0.990.030.02
a. The carbon content for L80 may be increased up to 0, 50 % maximum if the product is oil-quenched.
b. The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the WT is less than 17, 78 mm.
c. The carbon content for R95 may be increased up to 0, 55 % maximum if the product is oil-quenched.
d. The molybdenum content for T95 Type 1 may be decreased to 0, 15 % minimum if the WT is less than 17, 78 mm.
e. 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 analysis.

Mechanical Properties of OCTG pipe chart

Tensile and Hardness Requirements
Grade Type Total Elongation Under Load Yield strength MPa Tensile strength MPa Hardness a,c max Specified Wall Thickness Allowable Hardness Variation b
min max min HRC HBW mm HRC
1 2 3 4 5 6 7 8 9 10
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
L80 1 0.5 552 655 655 23.0 241
L80 9Cr 0.5 552 655 655 23.0 241
L80 13Cr 0.5 552 655 655 23.0 241
C90 1 0.5 621 724 689 25.4 255 ≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40 3.0 4.0 5.0 6.0
T95 1 0.5 655 758 724 25.4 255 ≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40 3.0 4.0 5.0 6.0
C110 0.7 758 828 793 30.0 286 ≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40 3.0 4.0 5.0 6.0
P110 0.6 758 965 862
Q125 1 0.65 862 1034 931 b ≤12.70 12.71 to 19.04 19.05 3.0 4.0 5.0
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. b No hardness limits, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9. c For through-wall hardness tests of Grades L80(all types), C90, T98 and C110, the requirements stated in HRC scale are for maximum mean hardness number.

What Is OCTG--Types of OCTG products

OCTG stands for Petroleum State Pipe. It is a family of rolled metal products used in oil and gas drilling and production operations. The term OCTG is used in a wide range of products, including drill pipe, casing and tubing. These products are used to connect wellheads and downhole equipment to extract oil and gas from the surface. OCTG plays an important role in the oil and gas industry, and its products have great significance for safe and efficient drilling operations.
Drill Pipe
Drill pipe is a type of steel pipe used in oil and gas Wells. It consists of several different parts, including kelly, drill bit, drill string and casing. The kelly pipe is attached to the rig, it helps to rotate the drill string, it is part of the drill pipe. The drill bit is the part of the drill pipe that is drilled into the rock and is generally made of steel or tungsten. The drill string consists of drill pipe and extends from the kelly pipe to the drill bit, which helps to provide support for the bit as it is drilled. Casing is the end of the drill pipe and helps prevent the well from collapsing. All of these components work together to help oil and gas Wells run properly.
Casing Pipe
Casing and tubing are necessary in the process of oil drilling. Casing is placed and wrapped around the wellbore before drilling begins. The purpose is to protect soil layers and groundwater from contamination by drilling mud and/or fracturing fluids. In addition, casing stabilizes the wellbore. Drilling and casing operations alternate — the drill string is removed at predetermined intervals and the wellbore is lined and cemented with casing.
Tubing
Tubing is used to carry oil from deep inside an oil well to the surface. This is the third stage of the wellbore process. Oil and gas occasionally rise to the surface on their own; However, pumps are usually required to bring the fluid to the surface. Tubing is usually smaller in diameter than casing, except for those with a diameter of 4 1/2 inches. Therefore, the tubing must be secured to an external support structure, such as a rig or platform, to prevent collapse due to differential pressure.

Types of OCTG Connections

Oil Country Tubular Goods (OCTG) is a type of steel pipe used to transport crude oil, natural gas and other fluids in the oil and gas industry. It consists of metal attachments and steel pipes, which come in different sizes and grades, and each length of pipe has a special function and purpose. The purpose of the OCTG connection is to connect these steel pipelines together in series to build a network that can transport oil and gas from one location to another.

API Connection
API connection is a type of connection widely used in the oil and gas industry. They meet and exceed all of the American Petroleum Institute’s (API) regulatory standards. The API defines two types of coupling: one is undisturbed coupling (NU) and the other is externally disturbed coupling (EU). The NU connection is designed to connect two pipes of the same diameter, while the EU connection is designed to connect two pipes of different diameters.

Advanced connectivity
Advanced connectivity is a special type of proprietary connection that provides advanced features that API connectivity does not. Most advanced connections offer metal-to-metal seals to improve the integrity of high-pressure seals. The advanced connection has the characteristics of straight connection, no slot and special gap. This connection is suitable for gas Wells, high-pressure Wells, and Wells prone to corrosive wastewater production.

Furthermore, OCTG threading technology is a process method for forming grooves in the casing body and end. 

It can form a seal with these grooves when the pipe is connected to another device or pipe. Threads are generally leak-proof and robust enough to withstand oil and gas distribution grids. There are three different types of OCTG casing, each with its own unique advantages: for example, short round thread casing (STC), long Round thread casing (LTC), and support thread casing (BTC).

STC is considered the preferred solution for short length casing applications that do not involve high axial loads or bending. LTC is particularly suitable for axial loads, except in the case of extreme temperature or pressure overall well conditions. BTC is an excellent connection that provides long life in the face of high axial loads, moderate internal pressures and temperatures. Both the STC and LTC are round threads of a non-runout design with 8 dome threads per inch. The BTC has a flat root and flat top square thread, a runout design, and is equipped with five support threads per inch.

Each type of OCTG thread has different advantages and performance, which also makes OCTG the best choice for some applications. When choosing the best type of threading for your project, be sure to consider the well condition and the type of equipment that will be used.

OCTG for Sand Control - Slotted Liner

Slotted liner is a well screening device that is used for sand control and fluid retention in petroleum wells. It consists of a series of slotted holes that are drilled into the well screen to allow fluid to flow through while retaining sand and other particulate matter. Slotted liner is an effective way to improve well productivity and prevent formation damage. It is also a cost-effective alternative to traditional well screens. Slotted liner can be used in both new and existing wells, and it is available in a variety of materials and configurations.

Why Choose TUSPIPE?

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Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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