... a professional production of petroleum machinery such as drill collars, drill pipe and sucker rod manufacturers. Sophisticated production equipment, and has the ... certificate number as follows: the sucker rod No. 11B-0081, drill collar No. 7-1-0552, drill pipe, No. 5D-0104, ... products and production capacity: 1,Sucker rod 12 million m / year2,Drill Collar 10000pcs/year3,Drill pipe 20,000 tons / year4, ...