Structural foundation pipe for subsea wells, onshore surface hole drilling, and offshore drilling platform conductor strings.
24″ conductor riser with quick make-up connection bridges the drilling platform to the subsea wellhead, carrying drilling fluid return during well construction. At 156 ppf (232 kg/m), these are heavy structural members that must handle combined tension, bending, and torsion from platform motion, current loading, and running loads.
ZC-4S quick make-up connection: The ZC-4S is ZC Steel Pipe's proprietary large-diameter quick make-up connection, designed for repeated installation and retrieval over the drilling programme life. Key performance requirements for conductor riser connections: - High tensile capacity — typically 80–100% of pipe body strength - Efficient make-up: target 3–5 turns to full shoulder without requiring hydraulic tong correction - Reusable across multiple wells without re-threading - Seal suitable for drilling fluid internal pressure
SWAL (spiral welded) pipe body: At 24″ OD, spiral welded pipe is the standard and cost-effective manufacturing route. The SWAL process produces controlled helix seam welds with consistent penetration, meeting API 5L PSL1 requirements for conductor applications where the primary loading is structural rather than high-pressure fluid containment.
ZC Steel Pipe supplied this order to a Syrian drilling contractor with API 5L PSL1 MTC, ZC-4S connection dimensional inspection records, and individual pipe marking per the customer's well programme specification.