RETAI.RETAI was established in June 2009. The company offers the following products: oil casing, couplings, short sections, wire-wrapped screen pipes, slotted screen pipes, bridge-type slotted screen pipes, multi-layer composite screen pipes, and drilling casing. RETAI possesses mature production equipment and processes, strong technical capabilities, comprehensive testing facilities, and a robust quality assurance system. It has obtained ISO9001:2000 quality management system certification and API-5CT standard certification from the American Petroleum Institute. With a diverse product range, comprehensive specifications, and attentive technical services, RETAI serves as a qualified supplier and strategic partner to numerous domestic and international oil companies and oilfield service providers. Currently operating six automated production lines for oil country tubular goods (OCTG), RETAI processes and supplies tubing and casing with outer diameters ranging from 48.3mm to 762mm. This capability accommodates various steel grades—including J55, N80, L80, P110, L80-13Cr stainless steel, among others. Additionally, multiple wire-wrapped screen production lines process sand control pipes ranging from 60.30mm to 508mm in diameter to meet diverse geological requirements. The company possesses robust manufacturing and R&D capabilities, gathering a team of management and technical talents from the petroleum industry. The company possesses mature tubing and casing processing equipment alongside comprehensive testing and inspection methods. It manufactures proprietary special-thread connections with an annual production capacity of 150,000 tons of tubing and casing and 100,000 meters of sand control tubing. Primary products include: oil casing, sand control screen tubing, tubing and casing equipment, and screen tubing equipment.