Intermediate or production casing string for onshore oil drilling in the Middle East.
API 5CT K55 BTC at 9⅝″ × 47 ppf is one of the most frequently run intermediate casing strings in onshore oil and gas drilling worldwide. It provides adequate yield strength (minimum 379 MPa / 55 ksi) and collapse resistance for the intermediate depths typical of Middle Eastern onshore fields, where formation pressures are generally moderate and sour-service grades are not required.
BTC (Buttress Thread Coupling) is the API standard connection for K55 intermediate casing strings. Its square-shouldered buttress thread profile provides: - Higher tensile efficiency than STC or LTC — rated at 100% pipe-body tensile strength for most weights - Adequate hydraulic seal for liquid-service well construction - Wide field availability of running tools and thread compounds
9⅝″ 47 ppf is a slim wall (9.50 mm) within the 9⅝″ weight range; it is selected for shallower depths or wells with predictable pore pressures where collapse loading is not the governing design criterion.
ZC Steel Pipe supplied this 1,200-piece shipment with full API 5CT PSL1 documentation, BTC gauge inspection certificates, thread compound pre-applied, and individual pipe ID stencilling per the operator's specification. R3 length (10.97–12.19 m) reduces the number of connections in the string, improving cementing efficiency and reducing make-up time.