Oil gas collecting device and tubular column

The utility model provides an oil gas collecting device and a tubular column thereof. The tubular column comprises an outer sleeve, a separation tube and a liquid carrying tube; a liquid-gas separation cavity, a communication cavity and a liquid carrying cavity are formed. In the well opening and closing process, gas and liquid produced by an oil and gas reservoir are gathered in the liquid-gas separation cavity and are subjected to gas-liquid separation in the liquid-gas separation cavity. A communicating cavity is formed between the separation pipe and the liquid carrying pipe, and a liquid carrying cavity is formed in the liquid carrying pipe; the liquid-gas separation cavity is communicated with the communicating cavity through a first middle channel, the communicating position of the liquid-gas separation cavity and the communicating cavity is located above the underground liquid level, and gas in the liquid-gas separation cavity is introduced into the communicating cavity. A gas-liquid mixing chamber is