Abstract: Aimed at the horizontal well pilot in extra-viscous oil beds of the District No. 9, Karamay oilfield, the sensitivity analysis for such well's derivation direction and for the length of steam-injection attaching tube has been conducted. On the basis of optimization of parameters, index prediction for different production practice is camed out. It is concluded that for horizontal wells in District No.9,the huff-and-puff method ought to be a predominant choice. It gives an indication to such horizontal well production pattern.

Key words: Karamay oilfield, shallow layer, viscous oil, horizontal well, numerical simulation