3.2. The Offshore Crude Oil Processing System
It is easy to see from the offshore oil-oilgas gathering and transfer process that the crude oil processing system includes the oil-gas separation, crude oil dehydration and desalination, associated gas processing and so on, which will be respectively introduced below.
3.2.1. Oil-Gas Separation
With the liquid's pressure decreasing during the process of the reservoir’s liquid flowing from underground to the wellhead along the tubing, the gas dissolving in the oil under the conditions of the reservoir's high temperature and high pressure is continuously separated out and forms an oil-gas coexistence mixture together with the oil. Therefore, it is necessary to separate the gas from the oil to meet the ...