Supercritical steam huff-puff well heat insulation steam injection tubular column and steam injection method

The invention discloses a supercritical steam huff and puff well heat-insulation steam injection tubular column and a steam injection method, and relates to the field of thickened oil thermal recovery equipment and application. A steam injection packer is arranged on the upper portion of a pressure packer, before steam injection operation is started, normal-temperature pressure water is injected into the heat-insulation steam injection tubular column, the pressure packer is set at first, and then the steam injection operation is completed; the annular gap between the outer circle of the heat insulation steam injection tubular column and the inner hole of the oil well casing pipe is divided into an upper section and a lower section, so that the external environment of the steam injection packer located on the upper portion of the pressure packer can be prevented from being affected by steam pressure in the follow-up steam injection operation, smooth setting of the steam injection packer is guaranteed, and the