Slim-hole and ultra-slim wells; HPHT gas-tight sealing; horizontal and extended-reach wells; corrosive environments with H₂S, CO₂, and chlorides.
580 pieces of 9⅝″ P-110 with ZC-31 full-flush connection, shipped in 20 standard 40 ft containers to an African operator. The containerised shipping format — versus conventional pipe-rack ocean freight — allows the operator to use standard port handling equipment and reduces demurrage exposure for landlocked delivery points.
P-110 at 9⅝″ — the deep production casing standard: P-110 (minimum yield 758 MPa / 110 ksi) is the dominant grade for deep and ultra-deep production casing in Africa's deepwater and HPHT onshore fields. Its high yield handles burst and collapse loading from formation pore pressures and annular fluid columns that exceed L-80 or N-80 design limits. API 5CT gives P-110 none of the controls it gives the sour grades — clauses 6.14 and 9.10 are both titled for Grades C90, T95 and C110, and P-110 has no hardness ceiling and no SSC test. Whether a given well environment permits P-110 is a NACE MR0175 / ISO 15156 question, not an API 5CT one; where sour qualification is required, T-95 is the usual step.
ZC-31 full-flush connection: Full-flush OD is essential at 9⅝″ production casing, which must pass through the 13⅜″ intermediate string with clearance for centraliser blades and cement flow. ZC-31 achieves full-flush OD by machining the coupling into the pipe end, eliminating the external shoulder that limits conventional coupled connections. The connection carries: - ISO 13679 CAL II or CAL III gas-tightness depending on ordered test level - High torque rating for rotational running in horizontal wells - Smooth internal bore with no ID upset — wireline tools pass without restriction
ZC Steel Pipe supplied this 20-container order with per-container packing lists, individual joint traceability, and ZC-31 thread gauge calibration certificates in a single documentation package.