Abstract: In order to control the severe situations, such as unbalanced advance of steam in plane and section, hot water breakthrough in partial intervals, 1.1% of rate of oil production, 0.12 of oil-steam-ratio, and continuous descending of development index at early stage of steam drive in Qigu formation heavy oil reservoir in District NO. 9 of Karamay oilfield, shutting in well, intennittent of steam injection, extending the tubing, added steam stimulation before steamdrive, and plugging have been successfully integrated to raise. Oil production by 48% , oil-steam-ratio by 90% , rate of oil production by 0.5%, and the number of steam drive response wells by 6 tunes, with 1: 10.1 of input-output-ratio .

Key words: Karamay oilfield, Heavy oil reservoir, Steam drive, Stimulation, Development effectiveness