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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聽20,000 psi) and temperatures (>200掳颁).
• Subsea Pipelines: Resisting hydrogen sulfide (H鈧係) and CO鈧�-induced corrosion in sour gas fields.
• Hydraulic Fracturing: Withstanding abrasive proppants and cyclic stress during fracking operations.

Material Solutions

• 13Cr/15Cr Stainless Steel: Combats CO鈧� corrosion in sweet wells.
• Duplex 2205/2507: Resists H鈧係 cracking in sour environments.
• Inconel 625: Used in ultra-HPHT wells (>300掳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.