API 5CT N80 Casing and Tubing

API 5CT L80 Casing And Tubing are types of steel pipes used in the oil and gas industry for drilling and completion operations. The L80 designation refers to the steel grade and mechanical properties of the pipe, including its yield strength, tensile strength, and hardness. L80 Casing and Tubing are commonly used in wells with moderate to high pressure and sour environments, where corrosion resistance and toughness are critical. They are available in various sizes, lengths, and connections, and are manufactured according to the API 5CT specification, which sets standards for the design, manufacturing, and testing of oil country tubular goods (OCTG).

Pipe Process of API 5CT N80 Casing and Tubing

Round Pipe →  pipe inspection  → NDT inspection MPI → End Threading → Thread Inspection → Coupling Threading lnspection  → NDT inspection MPI ( coupling) → Phosphating (for coupling) → Coupling power Make up → Hydrostatic test → Drift test → Doping and Protectors Application  → Coating  → Measurement of  Length and Weight → Colour Identification → Marking → Packing → Warehousing

N80 and L80 are both grades of steel used in oil and gas drilling operations. The main difference between N80 and L80 is their chemical composition and mechanical properties.

N80 is a medium-strength steel with a minimum yield strength of 80,000 psi and a minimum tensile strength of 100,000 psi. It has a higher carbon content than L80 and is commonly used in wells with high pressure and high temperature conditions.

L80 is a low-strength steel with a minimum yield strength of 80,000 psi and a minimum tensile strength of 95,000 psi. It has a lower carbon content than N80 and is commonly used in wells with moderate pressure and temperature conditions.

In addition to their different mechanical properties, N80 and L80 also have different chemical compositions. N80 contains higher levels of chromium, molybdenum, and nickel, while L80 contains higher levels of carbon and manganese.

N80 Type 1 and Type Q
Steel grade N80 type 1 products shall be normalized or normalized and tempered at the option of the manufacturer.
N80Q steel grade products shall be quenched and tempered.
R95
R95 steel grade shall be quenched and tempered.
L80
When tempered at temperatures below 620 ℃(1150°F) , and grade L80 grade 13 Cr may be embrittled.
Straightening
R95
R95 casing and tubing shall not be stretched or expanded cold working after final tempering, except for cold working which is necessary for normal straightening and not more than 3% of compression cold working.
M65 and L80
Except for the cold working required for normal straightening, steel grade M65 and L80 products shall not be cold worked after final heat treatment.
C90 and T95
C90 and T95 products can be cold-rotated straightened, but the pipe must be heated to a minimum temperature of 480 ℃(1000°F) degrees for stress relief after straightening. If necessary, light gag straightening for steel grade C90 and T95 products are allowed.
C110
If necessary, the product shall be cold-rotated straightened and subsequently stress-relieved at temperatures between 30℃to 55℃ (50°F to 100 °F) below the final specified tempering temperature, or hot-rotated straightened at temperatures not more than 165℃ (300°F) below the final specified tempering temperature of . If necessary, it is allowed to do light gag straightening.
Q125
Gag-press straightening or hot-rotating straightening can be performed for straightening , but the temperature at the end of the rotary straightening should not be less than 400 ℃ (750°F) (unless a higher temperature minimum is specified on the order). If the hot rotary straightening method cannot be used, the product can also be cold-rotated straightened, but the stress relief must be performed at 510 ℃ (950°F) after straightening. Product can not be subjected to stress relief after cold rotary straightening only by agreement between the purchaser and the manufacturer.

Advantages of N80 casing and tubing

1. High strength: N80 casing is made of high-strength steel material, which makes it resistant to deformation and collapse under high pressure and high temperature conditions.

2. Corrosion resistance: N80 casing has excellent corrosion resistance properties, which makes it suitable for use in harsh environments with high levels of hydrogen sulfide (H2S) and carbon dioxide (CO2) gas.

3. Good sealing performance: N80 casing has good sealing performance, which helps to prevent the leakage of oil and gas from the wellbore.

4. Easy to install: N80 casing is easy to install and can be used in a variety of wellbore configurations, making it a popular choice for oil and gas drilling operations.

5. Cost-effective: N80 casing is a cost-effective option for drilling operations, as it offers a good balance of strength, corrosion resistance, and sealing performance at a reasonable price.