The invention discloses a skid-mounted gas
injection device, which comprises a
carbon dioxide storage tank, a liquid feeding pump, a
pressure injection pump and a heating pipeline, wherein the carbondioxide
storage tank comprises a vehicle filling gaseous phase
pipe, a vehicle filling
liquid phase pipe and a liquid feeding pump liquid inlet
pipe, the vehicle filling gaseous phase pipe and the vehicle filling
liquid phase pipe are connected with an external mobile tank vehicle, the liquid feeding pump liquid inlet pipe is connected with a liquid feeding pump, a liquid feeding pump liquid outlet pipe is arranged between the liquid feeding pump and the
pressure injection pump, a
pressure injection pump liquid outlet pipe is arranged between the pressure
injection pump and the heating pipeline, the heating pipeline is connected with a pressure-relief
injection well, and the
carbon dioxide storage tank, the liquid feeding pump, the pressure
injection pump and the heating pipeline are arranged on a skid carrier. Through arranging the
carbon dioxide storage tank, the liquid feeding pump, the pressure
injection pump and the heating pipeline on the skid carrier, the skid-mounted gas
injection device is convenient to use and flexible to move, saves the construction of a gas injection room and reduces the cost; and the heating pipeline is arranged for rising the temperature of the carbondioxide at an outlet of the pressure injection pump, thereby avoiding shrinkage and fracture of the downhole oil casing tubular column, and ensuring safe production.