The invention relates to a gas-liquid separation device capable of achieving self-adaptive adjustment of an underground inverted cone of a gas
recovery well and an injection-production process of the gas-liquid separation device. The gas-liquid separation device capable of achieving self-adaptive adjustment of the underground inverted cone of the gas
recovery well comprises a
cyclone separation structure and a gas-
liquid phase step-by-step separation structure, and a plurality of feeding ports are formed in the upper portion of the
cyclone separation structure; the gas-
liquid phase step-by-step separation structure comprises a second-stage liquid
discharge cavity, a first-stage liquid
discharge cavity, an inverted cone self-adaptive structure and a liquid accumulation cavity, the lower part of the second-stage liquid
discharge cavity is located in the liquid accumulation cavity, a reducing section of the second-stage liquid discharge cavity is provided with a plurality of flow guide holes, the lower port of the second-stage liquid discharge cavity is connected with the first-stage liquid discharge cavity, the inverted cone self-adaptive structure comprises an inverted cone, a
piston column and a
liquid storage cavity, and the
piston column is connected with the inverted cone. An upper limiting baffle is arranged on the lower portion of the first-stage liquid drainage cavity, the lower end of the first-stage liquid drainage cavity is connected with a
liquid storage cavity, a lower limiting baffle is arranged on the upper portion of the
liquid storage cavity, a column body of the
piston column is located between the upper limiting baffle and the lower limiting baffle, and a
piston rod of the piston column is connected with an inverted cone. The gas-liquid separator is energy-saving, efficient, stable in gas-liquid separation and good in self-
adaptive capacity.