API 5CT N80 Casing

N80 API 5CT Casing /Tubing suppliers, N80 Oil And Gas Api Casing Pipe, N80 Api Oilfield Casing Pipe, N80 Api Steel Casing Pipe, N80 Api Casing /Tubing, Nue Api Tubing, Eue Api Tubing, Grade N80 Oil Well Drilling Casing Pipe Oil Casing And Seamless Pipe, Seamless 5ct Petroleum Casing Pipe, Petroleum Casing Pipe, Petroleum Tubing, Oil Casing Pipe, Casing & Tubing, Smls Steel Pipes And Casing Tubing, API 5ct Oil Casing Pipe, API 5ct Oilfield Tubing, API 5CT N80 Petroleum Casing Pipe, Grade N80 Oil Well Drilling Tube Casing And Tubing, Tubing And Casing, OCTG Steel Pipe, Petroleum Steel Pipe, Seamless Casing, N80 Casing, Oil And Gas Casing, OCTG Casing, 4 1 2 Casing, N80 Tubing, N80 Material, NSSMC ERW Casing, Casing Pipe, Oil Casing Pipe, Well Casing Pipe, Steel Casing Pipe, Seamless Casing Pipe, Casing Pipe Manufacturers, Steel Pipe Casing, Casing Pipe Company, Oil Tube For Petroleum And Natural Gas Industries, Steel Pipe For Oil Well, Pipeline To Transport Fluid, Fluid Conveying Pipe And Casing, Containment Pipe, Well Casing Protection API 5CT N80 Casing Tubing is a API 5CT Oil Casing Pipe & mainly used for oil well drilling. We manufacture API 5CT N80 Casing Tubing in accordance with the SY/T-96 standard, it is available as short thread type and long thread type supplied with their couplings. According to American Petroleum Institute Standard API SPEC 5CT 1st edition, the steel grade of API 5CT oil casing pipe can be divided into ten types, including H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110 and Q-125. We supply the casing pipe & API 5CT N80 Casing Tubing accompanied with thread and coupling, or we offer our product in accordance with the following forms for option. If you are interested in API 5CT N80 Casing Tubing, we will supply you with the best price based on the highest quality.

What is API 5CT N80 Casing Tubing?

OCTG: Oil country tubular goods is the classification used for a variety of downhole products API 5CT N80 Casing Tubing serves to transport both crude oil and natural gas from oil and gas layer to the surface pipeline after drilling is completed. It is able to bear the pressure produced by the exploitation process. After the outer surface is coated with a protective layer, the tubing is marked in accordance with the API 5CT standard and strapped with metal belt. Our oilfield tubing & API 5CT N80 Casing Tubing can be widely applicable to petroleum, construction, shipbuilding, smelting, aviation, electric power, food, paper, chemical industry, medical equipment, boilers, heat exchangers, metallurgy and so on. This oilfield tubing can be classified as NUE type and EUE type. You can find here Casing Dimensions & Casing Wall Thickness. Specifications include 1.9in(48.3mm), 2 3/8in(60.3mm), 2 7/8in(73.03mm), 3 1/2in(88.9mm), 4in(101.6mm), 4 1/2in(114.3mm) etc. The depth of our product for descending the well is basically identical to that of oil casing pipe. Both mechanical property and sealing performance of this tubing are also required to correspond with the oil casing pipe. Petroleum Tubing main steel grade includes J55, N80, C90, P110 and some others. for more details check below Casing And Tubing Tables, Casing Grade Table, & Casing Data Tables.

API 5CT N80 Casing:

N80 Casing is placed downhole to provide structural integrity to the wellbore and must withstand external-collapse pressure from rock formations and internal-yield pressure from fluid and gas. It must also hold its own deadweight and withstand the torque and transaxial pressure placed on it while running downhole.

API 5CT N80 Tubing:

N80 Tubing is placed within the casing. It is used to transport oil and gas from the source rock to the wellhead.

API 5CT K55 Casing Tubing Specification

Standard API 5CT/ ISO Grade Group.1 H40/PSL.1, J55/PSL.1, J55/PSL.2, J55/PSL.3, K55/PSL.1, K55/PSL.2, K55/PSL.3, N80(1)/PSL.1, N80(1)/PSL.2, N80(Q)/PSL.1, N80(Q)/PSL.2, N80(Q)/PSL.3 Group.2 M65/PSL.1, M65/PSL.3, L80/PSL.2, L80(1)/PSL.1, L80(1)/PSL.3, L80(9Cr)/PSL.1, L80(13Cr)/PSL.1, C90/PSL.1, C90/PSL.2, C90/PSL.3, T95/PSL.1, T95/PSL.2T95/PSL.3 Group.3 P110/PSL.1, P110/PSL.2, P110/PSL.3, Group.4 Q125/PSL.1, Q125/PSL.2, Q125/PSL.3, Minimum Order Quantity 1 Ton Outside Diameter Ranges Tubing 1.315 inch to 4 1/2 inch or 48.26mm to 114.3mm Casing 4 1/2 inch to 13 3/8 inch or 114.3mm to 339.72mm Wall Thickness According to API 5CT Standard Length Tubing R1 (6.10m to 7.32m), R2 (8.53m to 9.75m), R3 (11.58m to 12.80m) Casing R1 (4.88m to 7.62m), R2 (7.62m to 10.36m), R3 (10.36m to 14.63m) Type Seamless Type of End-Finish Tubing P, I, N, U Casing P, S, B, L Casing Pipe Specifications Standards:   API SPEC 5CT Model in Common Use:   2-3/8", 2-7/8", 3-1/2", 4", 4-1/2" Length Range:   R1(6.10-7.32m), R2(8.53-9.75m), R3(11.58-12.8m) Steel Grade (Casing Grades, Tubing Grades):   J55, K55, N80-1, N80-Q, L80, P110 Type of Screw Thread:   Non upset threaded end(NUE), External upset threaded end(EUE) Specialties

• Threading
• Heat treating
• External upset
• Drifting (Full-length, or just ends)
• Hydrostatic Testing
• Full third-party inspection capabilities (EMI, SEA, and Weld Line)
• Couplings – EUE, AB Modified, turned down, special clearance couplings
• Coating to customer specifications
• Pup Joints

PRODUCT GRADE DIAMETER END TYPE N80 TUBING J55, JFBNAU, L80, P110, 1% Chrome 2.375" – 3.5" Plain End EUE 8RD N80 CASING J-55, L80 HC, P110 HC 4.5" – 9.625" (J55, L80 HC, P110 HC) 10.75” - 20” (J55) Plain End, STC, LTC, BTC N80 TUBING SIZES, CASING DRIFT SIZES AND AVAILABLE GRADES: OD Wall PE # / ft T&C # / ft Collar API Drift Available Grades 2.375″ .190 4.44 4.7 EUE, AB MOD 1.901 J55, J-FBNAU, N80, L80, P110 2.875″ .217 6.17 6.5 EUE, AB MOD 2.347 J55, J-FBNAU, N80, L80, P110 3.5″ .254 8.81 9.3 EUE, AB MOD 2.867 J55, J-FBNAU, N80, L80, P110 Casing Sizes And Grades, Casing And Tubing Dimensions Pipe Casing Sizes, Oilfield Casing Sizes & Casing Drift Sizes Outer Diameter (Casing Pipe Sizes) 4 1/2"-20", (114.3-508mm) Standard Casing Sizes 4 1/2"-20", (114.3-508mm) Thread Type Buttress thread casing, Long round thread casing, Short round thread casing Function It can protect the tubing pipe. Oil Tube For Petroleum And Natural Gas Industries Name of Pipes Specification Steel Grade Standard D (S) (L) (mm) (mm) (m) Petroleum Casing Pipe

127-508

Check now

5.21-16.66

6-12

J55. M55. K55. L80. N80. P110.

API Spec 5CT  (8) Petroleum Tubing

26.7-114.3

2.87-16.00

6-12

J55. M55. K55. L80. N80. P110.

API Spec 5CT  (8) Coupling

127-533.4

12.5-15

6-12

J55. M55. K55. L80. N80. P110.

API Spec 5CT  (8) API 5CT N80 Casing Tubing Chemical Composition, mass fraction (%) Group Grade Type C Mn Mo Cr Ni max. Cu max. P max. S max. Si max. min. max. min. max. min. max. min. max. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 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 c - 1.9 - - - - - - 0.03 0.03 0.45 2 M65 - - - - - - - - - - - 0.03 0.03 - L80 1 - 0.43 a - 1.9 - - - - 0.25 0.35 0.03 0.03 0.45 L80 9Cr - 0.15 0.3 0.6 0.9 1.1 8 10 0.5 0.25 0.02 0.01 1 L80 13Cr 0.15 0.22 0.25 1 - - 12 14 0.5 0.25 0.02 0.01 1 C90 1 - 0.35 - 1.2 0.25 b 0.85 - 1.5 0.99 - 0.02 0.01 - T95 1 - 0.35 - 1.2 0.25 d 0.85 0.4 1.5 0.99 - 0.02 0.01 - C110 - - 0.35 - 1.2 0.25 1 0.4 1.5 0.99 - 0.02 0.005 - 3 P110 e - - - - - - - - - - 0.030 e 0.030 e - 4 Q125 1 - 0.35 1.35 - 0.85 - 1.5 0.99 - 0.02 0.01 - 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 wall thickness 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 wall thickness 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. API 5CT N80 Casing Tubing Mechanical Properties Standard Type Tensile Strength MPa Yield Strength MPa Hardness Max. API SPEC 5CT J55 ≥517 379 ~ 552 ---- K55 ≥517 ≥655 --- N80 ≥689 552 ~ 758 --- L80(13Cr) ≥655 552 ~ 655 ≤241HB P110 ≥862 758 ~ 965 ---- Group Grade Type Total elongation under load % Yield strength MPa Tensile strength min. MPa Hardness a max. Specified wall thickness mm Allowable hardness variation b HRC min. max . HRC HBW 1 2 3 4 5 6 7 8 9 10 11 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 ≤ 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 30 286 ≤ 12.70 12.71 to 19.04 19.05 to 25.39. ≥ 25.40 3.0 4.0 5.0 6.0 3 P110 - 0.6 758 965 862 - - - - 4 Q125 1 0.65 862 931 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 are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9 of API Spec. 5CT. API 5CT N80 Casing Tubing Steel color code Name J55 K55 N80-1 N80-Q L80-1 P110 Casing a bright green band two bright green bands a bright red band a bright red band + a green band a red band + a brown band a bright white band Coupling entire green coupling + a white band entire green coupling entire red coupling entire red coupling + a green band entire red coupling + a brown band entire white coupling ISO/API casing/ API 5CT N80 Casing Tubing specifications Codea Outer diameter Nominal weight (with thread and coupling) b,c Wall thickness End processing type mm kg/m mm H40 J55 M65 L80 N80 C90d P110 Q125d In Lb/ft K55 C95 1, Q T95d 1 2 3 4 5 6 7 8 9 10 11 12 13 9-5-8 32.3 244.48 48.07 7.92 S - - - - - - - 9-5-8 36 244.48 53.57 8.94 S SLB SLB - - - - - 9-5-8 40 244.48 59.53 10.03 - SLB SLB LB LB LB - - 9-5-8 43.5 244.48 64.73 11.05 - - LB LB LB LB LB - 9-5-8 47 244.48 69.94 11.99 - - LB LB LB LB LB LB 9-5-8 53.5 244.48 79.62 13.84 - - - LB LB LB LB LB 9-5-8 58.4 244.48 86.91 15.11 - - - LB LB LB LB LB 10-3-4 32.75 273.05 48.74 7.09 S - - - - - - - 10-3-4 40.5 273.05 60.27 8.89 S SB SB - - - - - 10-3-4 45.5 273.05 67.71 10.16 - SB SB - - - - - 10-3-4 51 273.05 75.9 11.43 - SB SB SB SB SB SB - 10-3-4 55.5 273.05 82.59 12.57 - - SB SB SB SB SB - 10-3-4 60.7 273.05 90.33 13.84 - - - - - SB SB SB 10-3-4 65.7 273.05 97.77 15.11 - - - - - SB SB SB 11-3-4 42 298.45 62.5 8.46 S - - - - - - - 11-3-4 47 298.45 69.94 9.53 - SB SB - - - - - 11-3-4 54 298.45 80.36 11.05 - SB SB - - - - - 11-3-4 60 298.45 89.29 12.42 - SB SB SB SB SB SB SB 13-3-8 48 339.72 71.43 8.38 S - - - - - - - 13-3-8 54.5 339.72 81.1 9.65 - SB SB - - - - - 13-3-8 61 339.72 90.78 10.92 - SB SB - - - - - 13-3-8 68 339.72 101.19 12.19 - SB SB SB SB SB SB - 13-3-8 72 339.72 107.15 13.06 - - - SB SB SB SB SB 16 65 406.4 96.73 9.53 S - - - - - - - 16 75 406.4 111.61 11.13 - SB SB - - - - - 16 84 406.4 125.01 12.57 - SB SB - - - - - 18-5-8 87.5 473.08 130.21 11.05 S SB SB - - - - - 20 94 508 139.89 11.13 SL SLB SLB - - - - - 20 106.5 508 158.49 12.7 - SLB SLB - - - - - 20 133 508 197.93 16.13 - SLB - - - - - - S-Short round thread, L-Long round thread, B-Buttress thread a. Code is used for ordering reference. b. The nominal weight of threaded and coupled casing (column 2) is shown for reference only. c. Martensitic chromium steel (L80 9Cr and 13Cr) differs from carbon steel in density. The shown weight of martensitic chromium steel is not an exact value. The mass correction factor 0.989 can be used. d. C90, T95 and Q125 steel grade casing should be supplied according to specification, weight and wall thickness listed in the above table or order. Codea Outer Dia Nominal weight (with thread and coupling) b,c Wall Thickness End processing type mm kg/m mm H40 J55 M65 L80 N801 C90d P110 Q125d In Lb/ft K55 C95 N80Q T95d 1 2 3 4 5 6 7 8 9 10 11 12 13 4-1-2 9.5 114.3 14.14 5.21 S S S - - - - - 4-1-2 10.5 114.3 15.63 5.69 - SB SB - - - - - 4-1-2 11.6 114.3 17.26 6.35 - SLB LB LB LB LB LB - 4-1-2 13.5 114.3 20.09 7.37 - - LB LB LB LB LB - 4-1-2 15.1 114.3 22.47 8.56 - - - - - - LB LB 5 11.5 127 17.11 5.59 - S S - - - - - 5 13 127 19.35 6.43 - SLB SLB - - - - - 5 15 127 22.32 7.52 - SLB LB LB LB LB LB - 5 18 127 26.79 9.19 - - LB LB LB LB LB LB 5 21.4 127 31.85 11.1 - - LB LB LB LB LB LB 5 23.2 127 34.53 12.14 - - - LB LB LB LB LB 5 24.1 127 35.86 12.7 - - - LB LB LB LB LB 5-1-2 14 139.7 20.83 6.2 S S S - - - - - 5-1-2 15.5 139.7 23.07 6.98 - SLB SLB - - - - - 5-1-2 17 139.7 25.3 7.72 - SLB LB LB LB LB LB - 5-1-2 20 139.7 29.76 9.17 - - LB LB LB LB LB - 5-1-2 23 139.7 34.23 10.54 - - LB LB LB LB LB LB 6-5-8 20 168.28 29.76 7.32 S SLB SLB - - - - - 6-5-8 24 168.28 35.72 8.94 - SLB LB LB LB LB LB - 6-5-8 28 168.28 41.67 10.59 - - LB LB LB LB LB - 6-5-8 32 168.28 47.62 12.06 - - - LB LB LB LB LB 7 17 177.8 25.3 5.87 S - - - - - - - 7 20 177.8 29.76 6.91 S S S - - - - - 7 23 177.8 34.23 8.05 - SLB LB LB LB LB - - 7 26 177.8 38.69 9.19 - SLB LB LB LB LB LB - 7 29 177.8 43.16 10.36 - - LB LB LB LB LB - 7 32 177.8 47.62 11.51 - - LB LB LB LB LB - 7 35 177.8 52.09 12.65 - - - LB LB LB LB LB 7-5-8 24 193.68 35.72 7.62 S - - - - - - - 7-5-8 26.4 193.68 39.29 8.33 - SLB SLB LB LB LB LB - 7-5-8 29.7 193.68 44.2 9.52 - - LB LB LB LB LB - 7-5-8 33.7 193.68 50.15 10.92 - - LB LB LB LB LB - 7-5-8 39 193.68 58.04 12.7 - - - LB LB LB LB LB 7-5-8 42.8 193.68 63.69 14.27 - - - LB LB LB LB LB 7-5-8 45.3 193.68 67.41 15.11 - - - LB LB LB LB LB 7-5-8 47.1 193.68 70.09 15.88 - - - LB LB LB LB LB 8-5-8 24 219.08 35.72 6.71 - S S - - - - - 8-5-8 28 219.08 41.67 7.72 S - S - - - - - 8-5-8 32 219.08 47.62 8.94 S SLB SLB - - - - - 8-5-8 36 219.08 53.57 10.16 - SLB SLB LB LB LB LB - 8-5-8 40 219.08 59.53 11.43 - - LB LB LB LB LB - 8-5-8 44 219.08 65.48 12.7 - - - LB LB LB LB 8-5-8 49 219.08 72.92 14.15 - - - LB LB LB LB LB API Tubing Specifications

API 5CT N80 Casing Tubing Features

• API 5CT N80 Casing Tubing is offered with a free length range from 8 to 13m on basis of the SY/T-96 norm. However, it is also available no less than 6m length and its quantity should be no more than 20%
• Any deformation such as crease, hairline, separation, crack or scab is not acceptable on both inner and outer surfaces of the product. All these defects should be completely removed, and the removed depth must not exceed 12.5% of nominal wall thickness.
• Deformations which mentioned above are not allowed to appear on the outer surface of API 5CT N80 Casing Tubing coupling
• The surface of thread of coupling and API 5CT N80 Casing Tubing should be smooth without any burr, tear or other defects that may have a negative impact on the strength and close connection.

API 5CT N80 Casing Tubing Packaging

In compliance with the regulation of SY/T-96, the domestic API 5CT N80 Casing Tubing should be strapped with steel wire or belt. The protection ring should be screwed on the exposed part of the thread of each casing pipe and its coupling to well protect the thread.

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© Canada Steel and Casing imports Inc.

The API 5CT specification covers seamless and welded casing and tubing pipes for upstream operations (pipes that belong to the OCTG family, as illustrated above).

Let’s review each type of OCTG pipe more in detail.

OCTG “CASING” PIPES

OCTG casing pipes, short for Oil Country Tubular Goods casing pipes, are specialized steel pipes used primarily in the oil and gas industry for the exploration, drilling, and production of hydrocarbons. These pipes serve as structural components in oil and gas wells, providing support to the wellbore and facilitating the extraction of oil and natural gas from underground reservoirs. Here’s a comprehensive overview of OCTG casing pipes:

1. Function and Importance

• OCTG casing pipes are an integral part of oil and gas well construction, serving multiple functions:
  • Providing structural support to the wellbore and preventing it from collapsing under the pressure of surrounding formations.
  • Sealing off the wellbore from surrounding formations to prevent the migration of fluids and gases.
  • Facilitating the installation of downhole equipment such as production tubing, packers, and pumps.
• Casing pipes play a crucial role in ensuring the integrity and efficiency of oil and gas wells, allowing for safe and efficient production operations.

OCTG casing pipes are a key structural component for an oil & gas well and have the following scope:

• Keep the borehole stability in the well
• Prevent the bore contamination from water sands
• Prevent water from producing formations
• Exercise tight control of the wellbore pressures during the drilling, production, and repair operations

Casing pipes are used to install:

• Blowout Preventers (BOP)
• Other wellhead equipment necessary to extract hydrocarbons
• Production tubing and packers

2. Construction and Materials

• OCTG casing pipes are typically made of high-strength, corrosion-resistant steel alloys such as carbon steel, alloy steel, or stainless steel.
• These pipes are manufactured using specialized processes such as seamless extrusion or electric resistance welding (ERW) to ensure uniformity, strength, and dimensional accuracy.
• Casing pipes are available in various sizes, grades, and specifications to suit different well conditions, depths, and environments.

3. Types of OCTG Casing Pipes

• Conventional Casing: Standard casing pipes used in conventional oil and gas wells, typically ranging from 4.5 inches to 20 inches in diameter.
• Premium Casing: High-performance casing pipes with enhanced properties such as corrosion resistance, high collapse resistance, and improved connection designs. Premium casing is often used in challenging well environments such as deepwater, high-pressure, and high-temperature wells.
• Threaded and Coupled Casing: Casing pipes equipped with threaded connections for easy installation and removal during well construction. These connections ensure a secure seal and allow for efficient makeup and breakout operations.

4. Grades and Specifications

• OCTG casing pipes are classified into different grades based on their mechanical properties, chemical composition, and performance characteristics.
• Common casing grades include API 5CT grades such as H40, J55, K55, N80, L80, C90, T95, P110, and Q125, each designed for specific well conditions and operating requirements.
• Specifications for OCTG casing pipes are established by organizations such as the American Petroleum Institute (API) and international standards organizations to ensure quality, consistency, and compatibility with well equipment and procedures.

5. Installation and Use

• Casing pipes are installed sequentially during the drilling process, with each section of pipe being lowered into the wellbore and connected to the previous section using threaded connections.
• Once installed, casing pipes are cemented in place to provide additional support and seal off the annular space between the casing and the surrounding formations.
• Casing pipes remain in place throughout the life of the well, serving as a permanent conduit for the extraction of oil and gas and providing structural integrity to the wellbore.

6. Challenges and Considerations

• Designing and selecting the appropriate casing string for a well requires careful consideration of factors such as well depth, formation characteristics, reservoir pressure, temperature, and fluid properties.
• Operators must also adhere to regulatory requirements and industry best practices to ensure the safe and environmentally responsible construction and operation of oil and gas wells.

7. Sizes and End-Connections

Casing pipes are available in a diameter range 4 1/2  to 20 inches, and in the following materials: H-40, J-55, K-55, N-80, L-80/C, 90/T, 95, P110, Q-125 – as discussed in more detail below.

The main types of connections for casing pipes are STC (short threads), LTC (long threads), BTC (buttress threads), and premium gas-tight connections.

In summary, OCTG casing pipes are essential components in the oil and gas industry, providing structural support, fluid containment, and well integrity in the exploration, drilling, and production of hydrocarbons. With their robust construction, diverse specifications, and critical role in well construction and operation, casing pipes play a vital role in the global energy sector, supporting the extraction of oil and gas resources from the earth’s subsurface.

Casing pipes are also one major individual component of the overall cost of the well,  therefore the correct selection of the casing size, materials, connectors, and depth shall be at the top of design engineers (for cost and efficiency reasons).

The six basic types of casing strings are:

• Conductor Casing
• Surface Casing
• Intermediate Casing
• Production Casing
• Liner
• Liner tieback casing

Oilfield casing pipes are positioned into the wellbore and cemented in place to secure both subsurface formations and the wellbore from collapsing, and also to enable drilling mud to circulate and extraction to take place.

The strict quality requirement for steel is due to the harsh working conditions of the casing.

The steel product should be produced and checked following special standards or specifications. ISO and API Spec 5CT have specified the steel product standards of the casing.

OCTG “TUBING” PIPES

OCTG tubing pipes, also known as Oil Country Tubular Goods tubing pipes, are specialized steel pipes used in the oil and gas industry for the production and transportation of oil, natural gas, and other fluids from underground reservoirs to the surface. These pipes are an essential component of oil and gas well completion and production systems, providing a conduit for the extraction of hydrocarbons from the reservoir to the surface facilities. Here’s a comprehensive overview of OCTG tubing pipes:

1. Function and Importance

• OCTG tubing pipes are designed to convey oil, natural gas, and production fluids from the reservoir to the surface during well production operations.
• They serve as a conduit for the passage of fluids, providing a pathway for the flow of hydrocarbons from the downhole reservoir to the surface processing facilities.
• Tubing pipes also play a crucial role in supporting and protecting the production tubing and downhole equipment such as pumps, packers, and sensors.

Tubing pipes are used to bring oil and gas from the underground reserves up to the field for further processing. Tubing pipes need resistance to mechanical stress as they are subject to very high loads and deformations during production operations. In addition, tubing pipe sizes should be properly calculated to support the expected oil and gas flow from the ground to the surface (a too-small diameter would decrease the production rate and the return on investment on the wellbore licenses, whereas too-large tubing would generate non-recoverable costs due to the greater amount of steel used for the bore construction vs. the actual requirement (steel for the casing and tubing pipes).

2. Construction and Materials

• OCTG tubing pipes are typically made of high-strength, corrosion-resistant steel alloys such as carbon steel, alloy steel, or stainless steel.
• These pipes are manufactured using specialized processes such as seamless extrusion or electric resistance welding (ERW) to ensure uniformity, strength, and dimensional accuracy.
• Tubing pipes are available in various sizes, grades, and specifications to suit different well conditions, depths, and environments.

3. Types of OCTG Tubing Pipes

• Conventional Tubing: Standard tubing pipes used in conventional oil and gas wells, typically ranging from 2.375 inches to 4.5 inches in diameter.
• Premium Tubing: High-performance tubing pipes with enhanced properties such as corrosion resistance, high collapse resistance, and improved connection designs. Premium tubing is often used in challenging well environments such as deepwater, high-pressure, and high-temperature wells.
• Coiled Tubing: Continuous lengths of small-diameter tubing wound onto a spool for use in well intervention and workover operations. Coiled tubing offers advantages such as faster installation, reduced rig time, and improved access to deviated and horizontal wellbores.

4. Grades and Specifications

• OCTG tubing pipes are classified into different grades based on their mechanical properties, chemical composition, and performance characteristics.
• Common tubing grades include API 5CT grades such as J55, K55, N80, L80, C90, T95, P110, and Q125, each designed for specific well conditions and operating requirements.
• Specifications for OCTG tubing pipes are established by organizations such as the American Petroleum Institute (API) and international standards organizations to ensure quality, consistency, and compatibility with well equipment and procedures.

5. Installation and Use

• Tubing pipes are installed inside the casing strings during the completion of an oil or gas well, forming a continuous conduit for the flow of production fluids from the reservoir to the surface.
• Once installed, tubing pipes are connected to downhole equipment such as pumps, packers, and safety valves to facilitate the production and monitoring of the well.
• Tubing pipes remain in place throughout the life of the well, allowing for the continuous production of oil and gas and providing access for well intervention and maintenance activities.

6. Challenges and Considerations

• Designing and selecting the appropriate tubing string for a well requires consideration of factors such as reservoir characteristics, production rates, fluid properties, and wellbore conditions.
• Operators must also adhere to regulatory requirements and industry best practices to ensure the safe and efficient production and operation of oil and gas wells.

7. Sizes, Materials, End-Connections

Tubing pipes are manufactured in seamless and welded execution, in the size range of 1.050 to 5 1/2 inches (consult this article to see the AP5CT tubing pipes sizes) and in the following material grades: H-40, J-55, K-55, N-80, L-80, C-90, T-95, P-110, Q-125 (more details about API 5CT tubing materials are in this article).

The main types of connections for tubing pipes are NUE (non-upset), EUE (external upset), and premium. Corrosion resistance under sour service conditions is a very important OCTG characteristic, especially for casing and tubing.

In summary, OCTG tubing pipes are essential components in the oil and gas industry, providing a conduit for the production and transportation of hydrocarbons from underground reservoirs to the surface. With their robust construction, diverse specifications, and critical role in well production operations, tubing pipes play a vital role in the global energy sector, supporting the extraction and production of oil and gas resources worldwide.

OCTG “DRILL” PIPES

OCTG drill pipes, also known as Oil Country Tubular Goods drill pipes, are specialized tubular components used in the drilling of oil and gas wells. These pipes are an integral part of the drilling string, serving as a conduit for the transmission of drilling fluid, as well as providing structural support and torque transmission to the drilling assembly. Here’s a detailed overview of OCTG drill pipes:

1. Function and Importance

– OCTG drill pipes are designed to transmit drilling fluid from the surface to the drill bit at the bottom of the wellbore during the drilling process.
– They provide structural support to the drilling assembly and facilitate the rotation and movement of the drill bit, allowing for the penetration of the earth’s subsurface layers.
– Drill pipes also serve as a conduit for the extraction of rock cuttings and debris from the wellbore to the surface, helping to maintain the integrity of the drilling operation.

2. Construction and Materials

– OCTG drill pipes are typically made of high-strength, alloyed steel to withstand the rigors of drilling operations and the harsh downhole conditions encountered in oil and gas wells.
– These pipes are manufactured using specialized processes such as seamless extrusion or electric resistance welding (ERW) to ensure uniformity, strength, and dimensional accuracy.
– Drill pipes are available in various sizes, lengths, and specifications to suit different drilling environments, depths, and applications.

3. Design and Components

– Drill pipes consist of several components, including the pipe body, tool joints, and threads.
– The pipe body is the main cylindrical section of the drill pipe, while the tool joints are the thicker, threaded ends that connect adjacent sections of pipe.
– Tool joints are designed to withstand high loads, torque, and bending stresses encountered during drilling operations and are typically made of hardened steel for increased durability.
– Threads are machined onto the tool joints to allow for the connection and disconnection of drill pipe sections, as well as the attachment of other drilling tools and equipment.

4. Specifications and Grades

– OCTG drill pipes are classified into different grades based on their mechanical properties, chemical composition, and performance characteristics.
– Common drill pipe grades include API 5DP grades such as E75, X95, G105, and S135, each designed for specific drilling conditions, formations, and operating requirements.
– Specifications for OCTG drill pipes are established by organizations such as the American Petroleum Institute (API) and international standards organizations to ensure quality, consistency, and compatibility with drilling equipment and procedures.

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5. Installation and Use

– Drill pipes are assembled into a drilling string and lowered into the wellbore using a drilling rig.
– The drill pipes are connected end-to-end using threaded connections and are rotated and pushed downward to advance the drill bit into the earth’s subsurface layers.
– Drilling fluid, also known as mud, is pumped through the drill pipes to cool the drill bit, carry rock cuttings to the surface, and provide hydraulic pressure to stabilize the wellbore.

6. Maintenance and Inspection

– Drill pipes undergo regular inspection and maintenance to ensure their integrity and performance during drilling operations.
– Inspection methods may include visual examination, dimensional checks, ultrasonic testing (UT), magnetic particle testing (MT), and other non-destructive testing (NDT) techniques to detect defects, cracks, and wear.

In summary, OCTG drill pipes play a critical role in the drilling of oil and gas wells, serving as conduits for drilling fluid, structural support for the drilling assembly, and transmission of torque to the drill bit. With their robust construction, diverse specifications, and vital function in the drilling process, drill pipes are essential components in the exploration and production of oil and gas resources worldwide.

OCTG PIPE MANUFACTURING PROCESS

The manufacturing process of OCTG (Oil Country Tubular Goods) pipes involves several steps to produce high-quality steel pipes suitable for use in the oil and gas industry. This process typically includes the following stages:

1. Steel Making

• The manufacturing process begins with the production of steel from raw materials such as iron ore, coal, and other alloying elements.
• Steel making may involve processes such as a basic oxygen furnace (BOF), electric arc furnace (EAF), or continuous casting, depending on the desired properties of the final product.

2. Billet Production

• Once the steel is produced, it is cast into solid cylindrical shapes called billets through continuous casting or casting molds.
• Billets serve as the starting material for the subsequent manufacturing steps in the production of OCTG pipes.

3. Pipe Manufacturing

• The billets are heated to high temperatures in a furnace to make them more malleable and easier to deform.
• The heated billets are then subjected to forging or extrusion processes to form seamless pipes. For welded pipes, the billets may be hot rolled into strip coils, which are subsequently formed into welded pipes through processes such as ERW (Electric Resistance Welding) or SAW (Submerged Arc Welding).
• For seamless pipes, the forged or extruded hollow blanks are further elongated and reduced in diameter through multiple rolling passes to achieve the desired dimensions and wall thickness.

4. Heat Treatment

• After the pipes are formed, they undergo heat treatment processes such as annealing, normalizing, or quenching and tempering to improve their mechanical properties and microstructure.
• Heat treatment helps to relieve internal stresses, refine the grain structure, and enhance the strength, toughness, and ductility of the pipes.

5. Surface Finishing

The pipes may undergo surface finishing processes such as shot blasting, pickling, or coating application to remove surface defects, improve corrosion resistance, and enhance appearance.

6. Testing and Inspection

• Throughout the manufacturing process, OCTG pipes undergo rigorous testing and inspection to ensure quality and conformance to specifications.
• Testing methods may include non-destructive testing (NDT) techniques such as ultrasonic testing (UT), magnetic particle testing (MT), radiographic testing (RT), and hydrostatic testing (HYT), as well as dimensional inspection and visual examination.

7. Marking and Identification

Once the pipes pass all quality checks and inspections, they are marked with relevant information such as size, grade, heat number, and manufacturer’s identification for traceability and identification purposes.

8. Packaging and Shipping

Finally, the finished OCTG pipes are carefully packaged for transportation and storage, typically in bundles or wooden crates, to protect them from damage during transit and handling.

In summary, the manufacturing process of OCTG pipes involves steel making, billet production, pipe manufacturing, heat treatment, surface finishing, testing and inspection, marking and identification, and packaging and shipping. By following stringent quality control measures and adhering to industry standards and specifications, manufacturers can produce high-quality OCTG pipes suitable for use in the demanding environments of the oil and gas industry.

To further understand the manufacturing processes of OCTG casing and tubing pipes the following should be taken into consideration:

OCTG PIPE SELECTION CRITERIA

Selecting the appropriate OCTG (Oil Country Tubular Goods) pipes for oil and gas wells is crucial to ensure the integrity, efficiency, and safety of drilling and production operations. Several factors should be considered when choosing OCTG pipes, including:

1. Well Conditions and Environment

– Evaluate the geological and reservoir conditions of the well, including formation type, depth, pressure, temperature, and fluid properties.
– Consider the anticipated downhole environment, such as corrosive fluids, high-pressure zones, sour gas (H2S), and high-temperature conditions, which may influence the selection of pipe materials and coatings.

2. Operating Requirements and Specifications:

– Determine the specific requirements and specifications for the well, including casing size, wall thickness, grade, length, and connection type (e.g., API or premium connections).
– Select OCTG pipes that meet industry standards and regulatory requirements, such as those set by the American Petroleum Institute (API) and international standards organizations.

3. Pipe Grade and Material:

– Choose the appropriate OCTG pipe grade based on the well conditions, operating parameters, and performance requirements.
– Consider factors such as mechanical properties (e.g., yield strength, tensile strength, hardness), corrosion resistance, collapse resistance, and fatigue resistance when selecting pipe grades.
– Evaluate the suitability of different pipe materials, such as carbon steel, alloy steel, and stainless steel, for the specific downhole environment and service conditions.

4. Connection Type and Performance:

– Select suitable pipe connections (e.g., threaded and coupled, integral premium connections) based on the oil & gas well design, completion method, and operational preferences.
– Consider the performance characteristics of pipe connections, including sealing integrity, tensile strength, torque capacity, and resistance to pressure and bending loads.

5. Premium vs. Conventional Pipes:

– Evaluate the benefits and trade-offs of premium OCTG pipes compared to conventional pipes, considering factors such as enhanced performance, reliability, and cost-effectiveness.
– Premium pipes may offer advantages such as improved corrosion resistance, high collapse resistance, enhanced connection designs, and extended service life, but they may come at a higher cost.

6. Cost and Budget Considerations:

– Assess the overall cost-effectiveness of OCTG pipe options, taking into account factors such as upfront procurement costs, lifecycle costs, and potential savings from improved performance and reliability.
– Balance the need for high-quality pipes with budget constraints and project economics to optimize value and minimize risks.

7. Supplier Reputation and Support:

– Choose reputable OCTG pipe manufacturers and suppliers with a track record of delivering high-quality products, reliable service, and technical support.
– Consider factors such as manufacturing capabilities, quality assurance processes, supply chain reliability, and customer service responsiveness when selecting suppliers.

8. Regulatory Compliance and Certification:

– Ensure that OCTG pipes comply with applicable industry standards, specifications, and regulations, such as API 5CT for casing and tubing products.
– Verify the authenticity of product certifications, test reports, and compliance documentation provided by suppliers to confirm product quality and traceability.

In summary, OCTG pipe selection involves careful consideration of oil well conditions, operating requirements, pipe properties, connection types, cost considerations, supplier reliability, and regulatory compliance. By taking a systematic approach to pipe selection and leveraging industry expertise and best practices, operators can choose the most suitable OCTG pipes to meet their specific needs and ensure the success of oil and gas drilling and production projects.

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