Shaanxi YanChang Petroleum JinShi Drilling Equipment LTD.

Shaanxi YanChang Petroleum JinShi Drilling Equipment LTD. (abbreviated as YanChang JinShi or 延长金石) is a joint-venture petroleum machinery manufacturer established on December 24, 2013. The company was approved by Shaanxi YanChang Petroleum (Group) and formed by three parties: Shaanxi YanChang Petroleum Materials Co., Ltd., YanChang Oilfield Co., Ltd., and Jiangsu Jinshi Machinery Group Co., Ltd. Headquartered at No. 2 Zaoyuan East Road, Lianhu District, Xi'an, Shaanxi Province, with a registered capital of RMB 10 million. The company operates under a model that combines YanChang Group's market network with Jiangsu Jinshi Group's manufacturing technology, integrating R&D, production, and sales into an Oil and Gas Wellhead Equipment Technology R&D Center. Main products include wellhead christmas trees, surface skid-mounted devices for oil and gas fields, choke and kill manifolds, blowout preventers, casing heads, flat gate valves, and a full range of A2(1), B1, and B2 class valves (ball valves, globe valves, check valves, gate valves, butterfly valves, and safety valves). The company holds API Q1, API 6A, API 16C, and API 5CT certifications and is a qualified supplier to CNPC, Sinopec, and CNOOC. Products are manufactured strictly to API standards. The company also holds 115 utility model and invention patents and 1 software copyright, and has been certified as a High and New Technology Enterprise (高新技术企业).