K55 - J55 Seamless Casing Pipe
K55 / J55 Seamless Casing Pipe - Strong, Economical, Full Well Condition Adaptability
J55: Conventional economic grade for shallow to medium-depth wells, low-pressure formations.
K55: Slightly higher strength than J55, suitable for moderately stressed or medium-depth wells.
Key difference: K55 has significantly higher tensile strength, offering better overload resistance.
●Seamless Manufacturing, Structural Integrity
Hot-rolled piercing + controlled cooling/cold drawing process-no weld seam defects.
Tight wall thickness tolerance.
●Excellent Burst & Collapse Resistance
Collapse resistance tablesavailable per grade & WT.
Each pipe hydrostatically tested per API requirements.
●Reliable Thread Seal & Galling Resistance
Threads are phosphated or copper-coated to reduce friction during make-up.
Thread protectors provided for shipping.
Water injection & observation wells
Low to medium pressure gas wells
Surface, intermediate, and production casing
Corrosion protection: External black paint or transparent anti-rust oil.
NDT methods: 100% UT or ET, optional flux leakage inspection.
Spectrochemical analysis per heat.
Hydrostatic test, dimensional check (OD, WT, thread profile) on each pipe.
TraceableMill Test Certificate(EN 10204 Type 3.1 or 3.2).
Certifications: API 5CT Monogram, ISO 9001, ISO 14001, OHSAS 18001.
