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Oil sand reservoirs play an important role in the economy of Canada. There are huge reserves in these reservoirs. Due to the large viscosity and low API of oil in these reservoirs, conventional methods cannot be used for producing oil from these reservoirs. For this reason, using Steam-assisted gravity drainage (SAGD) method is an efficient way of producing oil. SAGD is based on the drilling of two horizontal wells and injecting steam from one well and producing from another well. The bottom well is the producer which is close to the bottom of reservoir and the top well is the injector which is 5-10 meters above producer. For efficient SAGD operation, optimizing the trajectory of well is very important. It is desirable to keep the ratio of steam injection to oil production as low as possible. For optimizing well trajectory, reservoir simulation should be called several times. The CPU time of reservoir simulation is significant. For only one well pair the running time is about one day. By considering uncertainty and running different models, running time would be much larger too. For this reason, finding a proxy model that reasonably predict oil and water production is essential. In this paper, a real 3𝐷 well pair has been considered. Top gas and top water are existed in this reservoir and made it a complicate example. This paper showed that there is a good match between proxy and simulator results.