Units related to the storage and transportation of PetroChina in Beijing include the Oil and Gas Ground Engineering Division of PetroChina Global Engineering Company, PetroChina Planning Institute, PetroChina Beijing Oil and Gas Control Center, PetroChina Engineering Design (CPE) Beijing Branch, and the Design Department of PetroChina Engineering Construction Company (CPECC). Other units in the city include Langfang Pipeline Company, PetroChina Southwest Pipeline Company (Chengdu), West-East Gas Pipeline Company (Shanghai) and cpe Southwest Branch (Chengdu). As far as I know, the treatment and conditions of these units are good and the requirements are relatively high.
Beijing China Petrochemical Natural Gas Company
China Offshore Oil Pipeline Company (Hainan)
Storage and transportation can also go to oil refining enterprises, generally in cities, CNOOC Huizhou Refinery, PetroChina Chengdu Pengzhou Refinery (newly built), PetroChina Lanzhou Petrochemical, etc. Sinopec has many refining and chemical enterprises.