1. When the sucker rod is lifted 200mm, the plunger of the rod pump for steam injection thermal recovery is lifted synchronously through the mechanical linkage device to connect the steam injection hole of the sealing tube with the oil pipe. 2. The channel of the rod pump for steam injection thermal recovery adopts a high-temperature resistant alloy (Inconel 625) bushing, which can withstand continuous steam scouring at 350℃. In the field test of Liaohe Oilfield, the steam dryness retention rate is ≥85%. 3. When the plunger falls back, the cone surface (tolerance ±0.01mm) of the rod pump for steam injection thermal recovery forms a metal seal with the pump barrel, and the sealing pressure reaches 15MPa.
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