Seamless tubes are critical for oil and gas extraction, particularly in high-pressure, high-temperature (HPHT) wells and corrosive environments.

Key Applications

Downhole Tubing: Transporting hydrocarbons under extreme pressures (up to 20,000 psi) and temperatures (>200°C).
Subsea Pipelines: Resisting hydrogen sulfide (H₂S) and CO₂-induced corrosion in sour gas fields.
Hydraulic Fracturing: Withstanding abrasive proppants and cyclic stress during fracking operations.

Material Solutions

13Cr/15Cr Stainless Steel: Combats CO₂ corrosion in sweet wells.
Duplex 2205/2507: Resists H₂S cracking in sour environments.
Inconel 625: Used in ultra-HPHT wells (>300°C) with chloride-rich brines.

Manufacturing Challenges

Cold Pilgering: Ensures wall thickness uniformity for pressure integrity.
NACE MR0175 Compliance: Mandatory for sulfide stress corrosion cracking (SSCC) resistance.

Standards

API 5CT: Specifies seamless casing and tubing for oil wells.
ISO 13680: Defines corrosion-resistant alloy (CRA) seamless tubes.