Study of the Compatibility between Injecting Water and Reservoir Rocks in the First District of Wuliwan

The first district of Wuliwan in Jing'an Oilfield entered injection life since November 1997.At present the water-injection development has exposed some questions: the rapidly descending PI,the lower oil production rate and water absorbing capacity of formation,the upper injection pressure.These questions result in the approximatively invalid acidulation,low-density hole opener treatment and other stimulation treatments.In addition,the pollution can be induced for the lacking water supply and the bulk extracted sewage.This paper studies reservoir character of this district,the content of clay mineral,the sensitivity of rock core,the property of injected water and the permeability influence of the compatibility between injected water and reservoir bed.The conclusion: the first district of Wuliwan in Jing'an Oilfield is mainly using lower degree of mineralization surface water for the injected water;compatibility between surface water and the reservoir bed are bad.Produced water reinjection is advised for resolving the non-compatibility and the water-sensitive damage of reservoir bed.