The invention relates to an
oil well casing gas pressurizing and collecting device. The
oil well casing gas pressurizing and collecting device comprises a shell internally provided with a gas-liquid automatic separation
pipe; the gas-liquid automatic separation
pipe is sleeved with an antifreezing constant-temperature diversion
pipe; a
filter element is arranged inside the gas-liquid automatic separation pipe, the lower end of the gas-liquid automatic separation pipe is connected with an automatic separation drainage device, and the upper end of the gas-liquid automatic separation pipe is connected with an inlet of a second-level pressure stabilizing separator; a casing pressure
transmitter, a first vibration-resisting pressure gauge and a meter are arranged between the gas-liquid automatic separation pipe and the second-level pressure stabilizing separator; an outlet of the pressure stabilizing separator is connected with a compressor; the compressor is provided with an
overpressure safety valve and a thermoswitch; an input shaft is connected with a belt wheel through a
clutch; a gas outlet is connected with an oil collecting mains, and a second vibration-resisting pressure gauge is arranged between the gas outlet and the oil collecting mains; the gas outlet is connected with the interior of the antifreezing constant-temperature diversion pipe; a controller is arranged inside the shell; and the casing pressure
transmitter, the thermoswitch and the
clutch are all connected with the controller. The device is not provided with a motor, installed in front of an
oil well reduction gearbox and driven by left power of a motor of a pumping unit, and is small in size, easy to install and high in safety; and operation cost is avoided, oil gas is recycled thoroughly, energy waste is avoided, the environment is protected, and
pollution is completely eradicated.