Casing Pipe (OCTG)
The importance of casing Pipe in oil and gas Industry
Casing pipe, also known as oil country tubular goods (octg), plays a crucial role in the oil and gas industry. It is an essential component used in drilling and production operations. Casing pipe is a cylindrical structure that is inserted into the wellbore to provide structural integrity and support the walls of the well. This article will discuss the importance of casing pipe in the oil and gas industry and its various applications.
One of the primary functions of casing pipe is to prevent the collapse of the wellbore. When drilling a well, the surrounding rock formations exert pressure on the wellbore, which can cause it to collapse. Casing pipe is designed to withstand this pressure and maintain the integrity of the well. It acts as a protective barrier, preventing the wellbore from collapsing and ensuring the safety of the drilling operation.
In addition to preventing collapse, casing pipe also helps in isolating different formations. In an oil or gas reservoir, there are often multiple layers of rock formations, each with different properties. Casing pipe is used to isolate these formations and prevent the mixing of fluids. This is crucial for maintaining the productivity of the well and preventing contamination.
| Labels a | Calculated Mass c | ||||||||||
| Nominal linear Mass T& C b,c | Wall Thick- ness | em, Mass Gain or Loss Due to End finishing d | |||||||||
| Outside diameter | Inside Diameter | Drift Diameter | Plain- end | kg | |||||||
| Round Thread | Buttress Thread | ||||||||||
| wpe | |||||||||||
| D | kg/m | t | D | mm | kg/m | Short | Long | RC | SCC | ||
| mm | mm | mm | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 13 3/8 | 48 | 339.72 | 71.43 | 8.38 | 322.96 | 318.99 | 68.48 | 15.04 | — | — 17.91 | — |
| 13 3/8 | 54.5 | 339.72 | 81.1 | 9.65 | 320.42 | 316.45 | 78.55 | 13.88 | — | 16.44 | — |
| 13 3/8 | 61 | 339.72 | 90.78 | 10.92 | 317.88 | 313.91 | 88.55 | 12.74 | — | 14.97 | — |
| 13 3/8 | 68 | 339.72 | 101.19 | 12.19 | 315.34 | 311.37 | 98.46 | 11.61 | — | 14.97 | — |
| 13 3/8 | 68 | 339.72 | 101.19 | 12.19 | 315.34 | 311.37 | 98.46 | 11.67 f | — | 14.33 | — |
| 13 3/8 | 72 | 339.72 | 107.15 | 13.06 | 313.6 | 311.15 e | 105.21 | 10.98 | — | 13.98 | — |
| 13 3/8 | 72 | 339.72 | 107.15 | 13.06 | 313.6 | 311.15 e 309.63 309.63 | 105.21 | 10.91 f | — | 14.33 | — |
| 13 3/8 | 72 | 339.72 | 107.15 | 13.06 | 313.6 | 105.21 | 10.98 | — | 13.98 | — | |
| 13 3/8 | 72 | 339.72 | 107.15 | 13.06 | 313.6 | 105.21 | 10.91 e | — | — | ||
| 16 | 65 | 406.4 | 96.73 | 9.53 | 387.4 | 382.57 | 96.73 | 18.59 | — | — 20.13 | — |
| 16 | 75 | 406.4 | 111.61 | 11.13 | 384.1 | 379.37 | 108.49 | 16.66 | — | 18.11 | — |
| 16 | 84 | 406.4 | 125.01 | 12.57 | 381.3 | 376.48 | 122.09 | 14.92 | — | — | — |
| 16 | 109 | 406.4 | 162.21 | 16.66 | 373.1 | 368.3 | 160.13 | — | — | — | |
| 18 5/8 | 87.5 | 473.08 | 130.21 | 11.05 | 450.98 | 446.22 | 125.91 | 33.6 | — | 39.25 | — |
| 20 | 94 | 508 | 139.89 | 11.13 | 485.7 | 480.97 | 136.38 | 20.5 | 27.11 | 24.78 | — |
| 20 | 94 | 508 | 139.89 | 11.13 | 485.7 | 480.97 | 136.38 | 20.61 | 27.26 g 24.27 17.84 | 24.78 | — |
| 20 | 106.5 | 508 | 158.49 | 12.7 | 482.6 | 477.82 | 155.13 | 18.22 | 22 | — | |
| 20 | 133 | 508 | 197.93 | 16.13 | 475.7 | 470.97 | 195.66 | 13.03 | 16.02 | — | |
| NOTE See also Figures D.1, D.2, and D.3. | |||||||||||
| a Labels are for information and assistance in ordering. | |||||||||||
| b Nominal linear masses, threaded and coupled (Column 4) are shown for information only. | |||||||||||
| c The densities of martensitic chromium steels ( L80 types 9Cr and 13Cr) are less than those of carbon steels; The masses shown are therefore not accurate for martensitic chromium steels; A mass correction factor of 0.989 shall be used. | |||||||||||
| d Mass gain or loss due to end finishing; See 8.5. | |||||||||||
| e Drift diameter for most common bit size; This drift diameter shall be specified in the purchase agreement and marked on the pipe; See 8.10 for drift requirements. | |||||||||||
| f based on 758 mPa minimum yield strength or greater. | |||||||||||
| g Based on 379 mPa minimum yield strength. | |||||||||||
Casing pipe also plays a vital role in well control. During drilling operations, it is essential to control the flow of fluids and gases. Casing pipe is used to create a Seal between the wellbore and the surrounding formations, preventing the escape of fluids and gases. This helps in maintaining the pressure balance and preventing blowouts or other well control issues.
Another important application of casing pipe is in well completion. Once drilling is complete, casing pipe is used to complete the well and prepare it for production. It is cemented in place to provide additional support and stability. Casing pipe also serves as a conduit for the production of oil or gas from the reservoir to the surface. It allows for the installation of production Tubing and other equipment necessary for extracting hydrocarbons.
Casing pipe is available in various sizes and grades to suit different drilling conditions. The selection of the right casing pipe is crucial for the success of the drilling operation. factors such as well depth, formation characteristics, and operating conditions need to be considered when choosing the appropriate casing pipe.
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In conclusion, casing pipe is an indispensable component in the oil and gas industry. It provides structural integrity, prevents collapse, isolates formations, and ensures well control. Casing pipe is essential for well completion and production operations. The selection of the right casing pipe is crucial for the success and safety of drilling operations. With its various applications and importance, casing pipe continues to be a vital component in the oil and gas industry.
| API 5ct l80 casing tubingDimensions and Masses for standard Casing and for Casing Threaded with | |||||||||||
| API Round Thread and Buttress Thread | |||||||||||
| Labels a | Calculated Mass c | ||||||||||
| Nominal Linear Mass T& C b,c | Wall Thick- ness | em, Mass Gain or Loss Due to End Finishing d | |||||||||
| Outside Diameter | Inside Diameter | Drift Diameter | Plain- end | kg | |||||||
| Round Thread | Buttress Thread | ||||||||||
| wpe | |||||||||||
| D | kg/m | t | D | mm | kg/m | Short | Long | RC | SCC | ||
| mm | mm | mm | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 4 1/2 | 9.5 | 114.3 | 14.38 | 5.21 | 103.88 | 100.7 | 14.02 | 3.64 | — | — 4.53 | — 1.12 |
| 4 1/2 | 10.5 | 114.3 | 15.73 | 5.69 | 102.92 | 99.74 | 15.24 | 3.33 | — 3.61 | 4.32 | 0.91 |
| 4 1/2 | 11.6 | 114.3 | 17.38 | 6.35 | 101.6 | 98.42 | 16.91 | 3.18 | 3.35 | 4.07 | 0.6 |
| 4 1/2 | 13.5 | 114.3 | 19.87 | 7.37 | 99.56 | 96.38 | 19.44 | — | 3.53 | 3.64 | 0.24 |
| 4 1/2 | 15.1 | 114.3 | 22.69 | 8.56 | 97.18 | 94 | 22.32 | — | |||
| 5 | 11.5 | 127 | 17.19 | 5.59 | 115.82 | 112.64 | 16.74 | 4.32 | — 4.85 | — 5.38 | — 1.24 |
| 5 | 13 | 127 | 19.69 | 6.43 | 114.14 | 110.96 | 19.12 | 4 | 4.51 | 4.99 | 0.61 |
| 5 | 15 | 127 | 22.69 | 7.52 | 111.96 | 108.78 | 22.16 | 3.71 | 4.52 | 4.4 | 0.22 |
| 5 | 18 | 127 | 27.19 | 9.19 | 108.62 | 105.44 | 26.7 | — | 3.45 | 3.76 | –0.62 |
| 5 | 21.4 | 127 | 32.13 | 11.1 | 104.8 | 101.62 | 31.73 | — | 3.15 | 3.42 | –0.96 |
| 5 | 23.2 | 127 | 34.76 | 12.14 | 102.72 | 99.54 | 34.39 | — | 2.99 | 3.23 | –1.14 |
| 5 | 24.1 | 127 | 36.15 | 12.7 | 101.6 | 98.42 | 35.8 | — | |||
| 5 1/2 | 14 | 139.7 | 20.91 | 6.2 | 127.3 | 124.12 | 20.41 | 4.6 | — 5.26 | — 5.71 | — 0.87 |
| 5 1/2 | 15.5 | 139.7 | 23.48 | 6.98 | 125.74 | 122.56 | 22.85 | 4.36 | 5.31 | 5.41 | 0.58 |
| 5 1/2 | 17 | 139.7 | 25.72 | 7.72 | 124.26 | 121.08 | 25.13 | 4.14 | 4.5 | 4.84 | 0.45 |
| 5 1/2 | 20 | 139.7 | 30.05 | 9.17 | 121.36 | 118.18 | 29.52 | — | 4.37 | 4.31 | -0.52 |
| 5 1/2 | 23 | 139.7 | 34.05 | 10.54 | 118.62 | 115.44 | 33.57 | — | — | — | — |
| 5 1/2 | 26.8 | 139.7 | 40.15 | 12.7 | 114.3 | 111.12 | 39.78 | — | — | — | — |
| 5 1/2 | 29.7 | 139.7 | 44.47 | 14.27 | 111.16 | 107.98 | 44.14 | — | — | — | — |
| 5 1/2 | 32.6 | 139.7 | 48.74 | 15.88 | 107.94 | 104.76 | 48.49 | — | — | — | — |
| 5 1/2 | 35.3 | 139.7 | 52.8 | 17.45 | 104.8 | 101.62 | 52.61 | — | — | — | — |
| 5 1/2 | 38 | 139.7 | 56.82 | 19.05 | 101.6 | 98.42 | 56.68 | — | — | — | — |
| 5 1/2 | 40.5 | 139.7 | 60.64 | 20.62 | 98.46 | 95.28 | 60.55 | — | — | — | — |
| 5 1/2 | 43.1 | 139.7 | 64.41 | 22.22 | 95.26 | 92.08 | 64.38 | — | |||
| 6 5/8 | 20 | 168.28 | 29.76 | 7.32 | 153.64 | 150.46 | 29.06 | 5.58 | 6.23 | 6.35 | 0.89 |
| 6 5/8 | 24 | 168.28 | 35.72 | 8.94 | 150.4 | 147.22 | 35.13 | 4.42 | 5.48 | 5.52 | 0.68 |
| 6 5/8 | 28 | 168.28 | 41.67 | 10.59 | 147.1 | 143.92 | 41.18 | — | 4.73 | 4.71 | –0.75 |
| 6 5/8 | 32 | 168.28 | 47.62 | 12.06 | 144.16 | 140.98 | 46.46 | — | 4.73 | 4 | –1.46 |
