Water removing system for gas-water-containing crude oil and application method of system

The invention discloses a water removing system for gas-water-containing crude oil and an application method of the system. With the adoption of the system and the application method, water in an oil and gas and water system can be removed and reach the standard for discharge, energy consumption of follow-up pipeline transportation and equipment abrasion are reduced, and treatment pressure of the existing oil-gas-water separation device is reduced. The system comprises a bifurcation pipeline, a buffer tank and a columnar swirler, wherein the bifurcation pipeline comprises an upper inclined pipe, a lower horizontal pipe and a plurality of vertical pipes, and is used for removing gas and a part of oil from coming liquid; the buffer tank operates by controlling an oil-water interface in a tank body; and the columnar swirler is used for treating liquid at a lower outlet of the buffer tank to allow the liquid to reach the standard for discharge. With the adoption of the system and the application method, as several principles of gravity, expansion, centrifugation and the like are combined, the water in the gas-water-containing crude oil is treated directly; defects that the existing water treatment system is narrow in application scope and low in treatment efficiency are overcome; and treatment procedures and equipment weight are reduced. The water removing system is applicable to onshore oil fields and offshore oil fields, and is very good in industrial application prospect.