Cangzhou Zhongyou Drilling Tools Co., Ltd.

Cangzhou Zhongyou Drilling Tools Co., Ltd. (沧州中油钻具有限公司) is a Chinese manufacturer of rotary drill stem elements and threading/gauging equipment for the oil and gas industry, located in Cangzhou City, Hebei Province, China. The company holds API Monogram certification to API Spec 7-1 (Rotary Drill Stem Elements) and API Spec 7-2 (Threading and Gauging of Rotary Shouldered Connections), qualifying it to manufacture and supply API-stamped drill stem components including drill pipe, drill collars, heavy weight drill pipe, stabilizers, drill stem subs, and kellys, as well as rotary shouldered connection (RSC) thread gauges and gauging services. Cangzhou is a major hub for oilfield tubular goods and drill stem manufacturing in Hebei Province, with numerous API-certified manufacturers serving domestic Chinese operators (CNPC, Sinopec, CNOOC) and international export markets across the Middle East, Southeast Asia, and Central Asia. As an API 7-2 licensee, the company also provides rotary shouldered connection ring and plug thread gauges used to verify the dimensional conformance of NC, API Regular, and other RSC thread forms. The company supplies Chinese domestic oilfield operators as well as export customers requiring API Monogram-stamped rotary drill string equipment.