Abstract: Aimed at the characteristics of the steam injection stage of thermal recovery and based on the existed achievements, a relatively correct steamdistributed mathematic model is built in the paper. In this model, such factors as phase transition of fluids in wellbore and uneven inhibition of steam in formation are taken into account. Based on this research above mentioned, this model is verified by using actual testing data of several wells. It′s indicated that there exists a perfect match between the calculated values and testing data, which hints that the steam inhibition of the wells can be described with the steam distribution model established in this paper and the dynamic coupling law between the wellbore and formation can be reflected. The result of this research has guidance significance in the description of steam injection performance during thermal recovery of heavy oil.

Key words: heavy oil reservoir, steam huff and puff, multi phase flow, steamdistributed mathematical model, inhibition profile