The five certificates of CNOOC are required by all personnel working on offshore oil platforms, and the price is 2600 yuan. According to relevant information, CNOOC's five certificates are valid for five years, and all personnel working on offshore oil platforms must be trained and pass the examination before they can get on the platform. Cnooc has five certificates of 2600 yuan, hydrogen sulfide certificate of 600 yuan, and well control certificate of 1 000 yuan. All training fees for the required documents are paid by individuals themselves.