API 5CT K55 Seamless Oil Casing - Tubing
Products Description
1. Basic Standard Information
Item | Specification |
|---|---|
Product Standard | API 5CT (9th Edition) |
Steel Grade | K55 |
Product Type | Seamless Oil Casing / Tubing |
Manufacturing Process | Hot Rolled Seamless, Precision Finishing |
Applicable Well Depth | Medium-depth Oil & Gas Wells (conventional pressure & temperature) |
Genuine Standard Quality: 100% API 5CT standard compliance, no unqualified materials, no dimensional deviation.
Full Inspection System: Strict raw material incoming inspection + production process monitoring + finished product full testing.
Professional Custom Service: One-stop solution including specification customization, precision processing, packaging and transportation.
After-Sales Guarantee: Long-term technical support, product quality problem replacement and compensation mechanism, efficient after-sales response.
2. Mechanical Properties
Mechanical Index | Standard Value (MPa) | Standard Value (psi) |
|---|---|---|
Yield Strength (Min-Max) | 379 - 552 MPa | 55,000 - 80,000 psi |
Tensile Strength (Min) | ≥ 517 MPa | ≥ 75,000 psi |
Yield-Tensile Ratio | 0.58 - 0.84 | / |
Elongation | Compliant with API 5CT standard requirements | / |
3. Common Dimension Specifications
Nominal Size (in) | Outer Diameter (mm) | Wall Thickness (mm) | Nominal Weight (lb/ft) |
|---|---|---|---|
4-1/2" | 114.3 | 6.88 | 12.60 |
7" | 177.80 | 13.72 - 22.22 | 38.00 - 57.10 |
9-5/8" | 244.48 | 7.92 - 13.84 | 32.30 - 53.50 |
13-3/8" | 339.72 | 8.38 - 13.06 | 48.00 - 72.00 |
4. Dimensional Tolerance & Technical Details
·Outer Diameter Tolerance: ≤101.60mm: ±0.79mm; ≥114.30mm: ±1.0% of outer diameter
·Length Range: 3-12 meters, customized fixed lengths available
·End Connection Types: NU (Non-Upset), EUE (External Upset), PLBE (Plain End), customized threads available
·Surface Treatment: Standard anti-rust oil coating, paint spraying, custom anti-corrosion treatment
·Testing Items: Hydrostatic pressure test, ultrasonic flaw detection, mechanical property test, dimensional inspection, chemical composition analysis
Application Fields
API 5CT K55 seamless casing and tubing are specially designed for medium-pressure and medium-temperature downhole environments, widely applied in global petroleum and natural gas development projects, with core application scenarios as follows:
·Onshore Conventional Oil & Gas Wells: Wellbore wall support, isolation of different formation layers, prevention of well wall collapse and sand leakage in medium-depth conventional oil and gas wells.
·Shallow & Medium-Depth Gas Wells: Used as production tubing and casing for conventional gas fields, ensuring stable transmission of natural gas and resisting formation pressure.
·Water Injection Wells & Observation Wells: Applied in petroleum water injection development and well condition observation projects, with stable pressure resistance and long-term service stability.
·Small-Scale Offshore Well Projects: Suitable for conventional offshore shallow water oil and gas well construction, adapting to mild marine downhole environments.
·Oilfield Secondary Development & Well Renovation: Ideal for old well reinforcement, casing replacement and auxiliary well structure construction, with high cost performance.
FAQ (Frequently Asked Questions)
Q1: What is the difference between K55 and J55 steel grades in API 5CT standard?
A1: K55 has higher yield strength and tensile strength than J55 grade, with stronger pressure resistance and formation extrusion resistance. J55 is suitable for shallow low-pressure wells, while K55 is more applicable for medium-depth and medium-pressure oil and gas wells, featuring higher structural stability and wider application range.
Q2: Are your K55 seamless pipes fully compliant with API 5CT standards?
A2: Yes. All our K55 casing and tubing strictly follow API 5CT 9th edition standards. Each batch of products undergoes complete mechanical performance testing, hydrostatic pressure testing and non-destructive flaw detection, with official test reports and qualification certificates provided.
Q3: Can you provide customized specifications and thread processing?
A3: Custom services are fully supported. We can customize non-standard wall thickness, fixed lengths, and provide multiple thread processing methods including NU, EUE, and special customized threads. We also support personalized anti-corrosion and surface treatment according to customer project requirements.
Q4: What is the delivery cycle and packaging method?
A4: Conventional in-stock specifications can be delivered within 3-7 working days; customized specifications take 10-20 working days. Products adopt standard export packaging: steel pipe bundling anti-rust protection waterproof wrapping, equipped with standard export marks to ensure no damage during long-distance transportation.
Q5: What working environments are K55 pipes not suitable?
A5: K55 is a medium-strength conventional grade, not recommended for ultra-deep high-pressure wells, high-sulfur corrosive wells, and ultra-high temperature downhole environments. For harsh working conditions, we recommend N80, P110 and other high-grade OCTG steel pipes.
Q6: What quality testing reports can you provide?
A6: We can provide factory quality certificate, chemical composition report, mechanical property test report, hydrostatic pressure test report, ultrasonic flaw detection report, and API standard compliance certification report to meet international project inspection and customs clearance requirements.
