SAGD (Steam Assisted Gravity Drainage) mechanical lifting circulating preheating equipment

The utility model provides SAGD (Steam Assisted Gravity Drainage) mechanical lifting circulating preheating equipment which is applied to an intermediate casing of a horizontal well. The SAGD mechanical lifting circulating preheating equipment comprises a steam injection tube column, a mechanical lifting tube column and an oil well pump, wherein the steam injection tube column comprises a vertical section and a horizontal section, the vertical section is positioned at the vertical part of the intermediate casing, the horizontal section is positioned at the horizontal part of the intermediate casing, the steam is injected to a pitshaft of a horizontal well to realize the preheating of an oil layer through the tail end of the horizontal section, the mechanical lifting tube column is positioned at the vertical part of the intermediate casing, and the oil well pump is connected at the lower bottom end of the mechanical lifting tube column and is used for pumping the steam condensate water in the horizontal pump and the crude oil contained in the steam condensate water. The SAGD mechanical lifting circulating preheating equipment can solve the problem that as the pressure of the deep well or the strata is lower than the pressure of a well depth hydrostatic column, the circulating preheating of the oil layer can not be carried out.