Products Description
API 5CT N80-1 and N80Q are high-strength seamless steel casing pipes compliant with the latest API 5CT international standard, widely applied in onshore and offshore oil and gas well drilling, completion and production operations. As the most cost-effective and mainstream casing grades in the petroleum industry, N80 series casings feature stable mechanical performance, excellent pressure resistance and reliable structural stability.
》Core Difference Between N80-1 and N80Q：
N80-1 is a conventional hot-rolled casing with uniform basic mechanical properties, suitable for conventional oil and gas well working conditions. N80Q is a quenched and tempered high-performance variant with finer grain structure, superior toughness, better low-temperature resistance and higher impact resistance, ideal for deep wells, high-pressure wells and complex geological environments. Both grades adopt seamless forming technology, eliminating welding seam defects and ensuring long-term safe service in downhole harsh conditions.
|
Outer Diameter (OD) |
Wall Thickness (WT) |
Unit Weight |
Drift Diameter |
Applicable Grade |
|---|---|---|---|---|
|
4 1/2" (114.3mm) |
5.21mm - 8.56mm |
9.5 - 15.1 lb/ft |
3.701 - 3.965 inch |
N80-1 / N80Q |
|
5" (127.0mm) |
5.59mm - 9.19mm |
11.5 - 20.8 lb/ft |
4.044 - 4.408 inch |
N80-1 / N80Q |
|
5 1/2" (139.7mm) |
6.20mm - 10.54mm |
14.0 - 23.0 lb/ft |
4.500 - 4.920 inch |
N80-1 / N80Q |
|
6 5/8" (168.3mm) |
7.32mm - 12.06mm |
20.0 - 30.0 lb/ft |
5.480 - 5.960 inch |
N80-1 / N80Q |
|
7" (177.8mm) |
7.62mm - 12.65mm |
23.0 - 32.0 lb/ft |
5.820 - 6.300 inch |
N80-1 / N80Q |
|
9 5/8" (244.5mm) |
8.94mm - 13.84mm |
40.0 - 53.5 lb/ft |
8.500 - 8.980 inch |
N80-1 / N80Q |
|
13 3/8" (339.7mm) |
10.92mm - 15.88mm |
68.0 - 88.2 lb/ft |
12.150 - 12.620 inch |
N80-1 / N80Q |
- Length Range: R1 (4.88-7.62m), R2 (7.62-10.36m, mainstream export), R3 (≥10.36m)
- Thread Options: STC (Short Round Thread), LTC (Long Round Thread), BTC (Buttress Thread), VAM premium thread
- Full Size Coverage: OD 4 1/2" - 20" (114.3mm - 508mm), wall thickness 5.12mm - 16.13mm
|
Technical Item |
N80-1 Standard Value |
N80Q Standard Value |
|---|---|---|
|
Yield Strength (Min) |
552 MPa (80,000 psi) |
552 MPa (80,000 psi) |
|
Yield Strength (Max) |
758 MPa (110,000 psi) |
758 MPa (110,000 psi) |
|
Tensile Strength (Min) |
689 MPa (100,000 psi) |
689 MPa (100,000 psi) |
|
Elongation (Min) |
Compliant with API 5CT formula requirements |
Compliant with API 5CT formula requirements |
|
Impact Toughness |
Conventional level, no strict low-temp requirement |
High low-temperature impact resistance, stable in harsh environment |
|
Manufacturing Process |
Hot rolling, normalizing |
Quenching + tempering (QT heat treatment) |
|
Surface Treatment |
Anti-rust oil, thread protection |
Anti-rust oil, thread protection, precise heat treatment |
|
Execution Standard |
API 5CT (latest edition) |
API 5CT (latest edition) |
Application Fields
API 5CT N80-1 and N80Q seamless oil casings are core structural pipes for oil and gas well engineering, serving multiple global energy development scenarios:
- Onshore Oil & Gas Wells: Conventional production casing and surface casing for onshore shallow and medium-depth oil/gas wells, stabilizing wellbore and isolating stratum pressure.
- Offshore Oil & Gas Platforms: N80Q grade is preferred for offshore deep-water wells, with excellent toughness to adapt to complex marine geological conditions and high-pressure environments.
- Deep & Ultra-Deep Wells: N80Q heat-treated casing resists downhole high temperature, high pressure and stratum impact, avoiding pipe deformation and fracture.
- Geothermal & Shale Gas Drilling: Suitable for unconventional energy well construction, adapting to variable stratum stress and corrosive working conditions.
- Well Completion & Workover Projects: Used as production liner and intermediate casing to protect wellbore, prevent collapse and ensure long-term stable production.
FAQ
Q1: What is the key difference between N80-1 and N80Q casing?
A1: Both grades have identical yield and tensile strength standards. The main difference lies in manufacturing process and toughness. N80-1 is hot-rolled conventional casing for ordinary working conditions; N80Q adopts quenching and tempering heat treatment, featuring finer internal grain, higher low-temperature impact toughness and stronger anti-fatigue performance, suitable for deep wells, high-pressure wells and complex geological environments.
Q2: Are your products fully compliant with API 5CT standard?
A2: Yes. All our N80-1 and N80Q seamless casings are strictly manufactured in accordance with the latest API 5CT standard. We provide official factory test reports, material certificates and third-party inspection certificates (SGS, BV, TUV) to support global project acceptance.
Q3: What thread types and lengths can be customized?
A3: We support STC, LTC, BTC standard API threads and premium VAM threads. Standard lengths include R1, R2 and R3. Customized non-standard lengths, special thread processing and anti-corrosion treatment are available according to customer requirements.
Q4: What are your main export markets and packaging standards?
A4: Our casings are widely exported to Southeast Asia, Middle East, Africa, Europe and South America. Standard export packaging: thread protection ring + plastic end cap + steel belt bundling + waterproof wrapping, ensuring no damage during long-distance sea transportation.
Q5: Can you provide OEM and one-stop service?
A5: Yes. We support OEM customization, personalized marking, special surface anti-corrosion treatment, and provide one-stop services including size matching, quality inspection, container loading and logistics tracking to meet diverse customer procurement needs.
Q6: What is the delivery cycle?
A6: Conventional stock specifications can be delivered within 7-10 working days. Customized non-standard sizes and heat-treated products take 15-25 working days, depending on order quantity and processing requirements.
Our address
Rm1406,14th/F No 208, Hongqi Road, Nankai Dist, Tianjin City ,China
Phone Number (WhatsApp/Wechat)
+8616622033809
alisa@tjshenzhoutong.com
Hot Tags: api 5ct n80-1 n80q octg casing tubing seamless steel, China api 5ct n80-1 n80q octg casing tubing seamless steel manufacturers, suppliers, factory, seamless pipe for durability system connection, seamless pipe for flue connection, seamless pipe for monitoring system connection, seamless pipe for pneumatic systems, seamless pipe for pump connection, seamless pipe for regulator connection
