... , and cover such service fields as drilling, workover and production. This company is a member of “3 chou” equipments (pumping ... units, sucker rod and sucker rod pump) of SINOPEC and CNPC, and ... kinds main products, such asï¼ÂÂÂÂÂŒmast of drilling rig and workover, pumping units, subsurface sucker rod pump, ...