The study present in this paper aims to solve the problems happening in the heavy oil production wells with steam stimulation in Shanjiasi, Shengli Oilfield, that at the end of a circle, temperature fall causes the viscosity of the production liquids to increase significantly, which leads to various accidents. By analyzing the. laboratory test of the viscosity reduction and rheology of the heavy oil, etc., the feasible mechanism of mixing active water in heavy oil to emulsify and the relevant downhole prodution technique are obtained. With the technology of injecting active water down the annulus in three wells, the stable production is insured in the late production period of heavy oil wells with steam injection, and the production period is prolonged with a favorable economics.

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