D1-11 well, the reason of decreasing oil production is that the high wax in crude oil near wellbore resulted in plugging after analysis. We carried out BERO treatment on D1-11 well, mixed with formation water. The temperature of the injection fluid above 50 ℃.Pressure in the process of construction increased from 0 psi to 1450 psi D1-11 well was in close well to resume production in 5 days.D1-11 shows base oil from 2.4 BOPD to 4.7 BOPD.