... petroleum machinery products, and cover such service fields as drilling, workover and production. This company is a member of “3 ... in ten kinds main products, such asï¼ÂÂÂÂÂŒmast of drilling rig and workover, pumping units, subsurface sucker rod pump, sucker rod ... products quality. The main products are drilling rig drived by mechanical, compound and electric, workover rig, pumping units, sucker rod ...