Loading Port:Tianjin
Payment Terms:TT OR LC
Min Order Qty:1 m.t.
Supply Capability:1000 m.t./month
10.75" GeoShield Geothermal Casing
High-Temp Warrior: Works in 320°C geothermal brines
Composite Design:
Inner Layer: P110 steel (10mm)
Outer Layer: Grade 9 titanium (3mm)
Insulation: Aerogel-filled annular space
Iceland Success:
In Hellisheiði geothermal plant, these casings reduced thermal stress cracks by 92% versus conventional designs.
Capabilities:
Thermal Expansion: 0.011mm/m·°C
Chloride Resistance: 200,000ppm
Connection: Tenaris Wedge 563®
Support: Geothermal gradient analysis + 5-year thermal cycle testing
J55 Steel Deep Well Casing, P110 High-Grade Drilling Casing
Longkailai petroleum casing is strictly manufactured in compliance with API 5CT standards, covering mainstream steel grades such as J55, N80, and P110. It is suitable for wellbore reinforcement and formation isolation in onshore oilfields, offshore platforms, and complex geological environments, ensuring lifecycle safety of oil and gas wells.
Size Range:
Outer diameter 114.3 mm (4.5") to 508 mm (20"), wall thickness 6.2-25.4 mm, tolerances conform to API 5CT standards (outer diameter ±0.5%, wall thickness ±10%).
Mechanical Properties:
J55 Grade: Yield strength ≥379 MPa, tensile strength ≥517 MPa;
P110 Grade: Yield strength ≥758 MPa, tensile strength ≥965 MPa;
Collapse resistance: N80 Grade ≥80 MPa, P110 Grade ≥138 MPa (tested per ASTM A370).
Thread Performance:
API round thread (BTC) sealing pressure ≥20 MPa;
Premium connections (e.g., BGT2) helium leakage rate ≤1×10⁻⁶ cm³/s (tested per ISO 13679 CAL IV).
| Content | 0.25% | 1.20% | 0.45% | 0.50% | 0.25% | 0.020% | 0.010% |
| Note: Cr-Mo alloy design enhances H₂S corrosion resistance (H₂S partial pressure ≤0.3 kPa). |
High-Temperature & High-Pressure Wells:
L80-13Cr material withstands 180°C and CO₂ partial pressure ≤1 MPa (per NORSOK M-001).
Shale Gas Horizontal Wells:
TP140TT high-collapse casing with internal pressure resistance ≥105 MPa, compatible with multi-stage fracturing.
Deepwater Offshore Wells:
9-5/8" casing passes 30 MPa external pressure test, suitable for 3,000-meter water depth.
Material Smelting:
Electric Arc Furnace (EAF) + LF refining, sulfur/phosphorus ≤0.015%;
Continuous casting billet Φ180-400 mm, central segregation ≤Class C 1.0.
Hot Rolling:
Three-roll retained mandrel mill, wall thickness uniformity ≤5%;
Online spray cooling, final rolling temperature 900±20°C.
Heat Treatment:
Quenching (920°C water cooling) + Tempering (620°C air cooling), hardness 22-32 HRC;
Sour-service pipes use HWQ process, grain size ≥ASTM 7.
Quality Inspection:
100% ultrasonic testing (UT) for longitudinal defects (sensitivity Φ1.6 mm flat-bottom hole);
Full-length hydrostatic test (50-100 MPa, holding ≥10 seconds);
Drift test with API drift mandrel (100% pass rate).
