11 wells in DaQing Oilfield, the reason of decreasing oil production is that the high wax in crude oil near wellbore resulted in plugging after analysis. We had BERO treatment for these 11 wells from may 2006, and removed organic plugging of these wells effectively.

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Application of BERO™ Biosurfactant in Daqing and Its Effect(1)
11 wells in DaQing Oilfield, the reason of decreasing oil production is that the
high wax in crude oil near wellbore resulted in plugging after analysis. BERO™
biosurfactant can efficiently release hydrocarbon (oil) on the surfaces of solid
particles. It is a non-acidified preparation and will not cause secondary
pollution of reservoir or disturb crude oil dehydration and sewage treatment
systems and can prevent secondary plugging since it produces no other new
product during reaction.We had BERO treatment for these 11 wells from may
2006, and removed organic plugging of these wells effectively.
D1-1 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 D1-1 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.
D1-1 well was in close well to resume production in 5 days.D1-1 shows base
oil from 3.7 BOPD to 6.6 BOPD.