Abstract: Liaohe oil field is rich in heavy oil resources, it is the largest heavy oil production base in china. In recent years, Liaohe oilfield produced its heavy oil with horizontal well technology, and achieved good results. In order to improve heavy oil recovery ratio, the well structure, drilling string, drilling fluid and operation programs in Du84-XingH238 fishbone horizontal well was designed and optimized. The final effect evaluation result indicates that the fishbone horizontal well is more effective than normal horizontal well for exploitation of heavy oil and EOR.

Key words: Liaohe oilfield, heavy oil, fishbone horizontal well, recovery ratio, optimized design, site operation