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Many well project clients face a common dilemma: standard seamless stainless casing costs too much, while custom threaded welded casing raises concerns about weld quality, surface corrosion, and overall performance consistency. To meet high-pressure downhole requirements and optimize project budgets, we adopt a mature solution: weld male & female API 5CT threads onto standard stainless steel casing pipes. The core challenge of this process is simple: make welded casing perform exactly the same as integral seamless casing in well service. At OASIS WELL SCREEN CO.,LTD, we eliminate all quality risks with strict standardized processing:
Full Penetration Welding + NDT Inspection 100% full weld penetration for thread joints, with professional non-destructive testing to ensure weld integrity, no cracks or porosity, fully compliant with downhole pressure requirements.
Full-length Acid Pickling & Passivation The entire pipe body undergoes integral acid cleaning and passivation, restoring the stainless steel protective film. The surface anti-corrosion performance is consistent with original seamless pipes.
Strict API 5B Thread Calibration All threads are inspected per API 5B standard, ensuring precise thread taper, pitch and tightness, perfect on-site installation and sealing performance.
This optimized solution guarantees seamless-grade working performance while greatly cutting down material and on-site construction costs for well projects. Reliable, cost-effective, and fully standardized for water wells, geothermal wells and industrial downhole applications.
