Studing About Selective Acidizing Technique In High Water-cut Oil-wells

Domestic oilfields have been successively coming into high water-cut period after years of production. Seriously water injection circulates inefficiently, and scale plugs badly. Therefore, it is essential for high water-cut oil-wells to take measures which could increase oil production while control water production. Among the break block treatment, acidification is widly used for low cost and strong applicability. However,nomal aciding fluid usually fings where there is high permeability and full of water, and at the same time little goes into the low permeability zone, full of oil, to transform in heterogeneous reservoirs. Exploiting blocking agent combined with clean-up fluid to break down selectively is one method to solve the problem. So according to the specific of high water-cut oil-well, it is essential to develop efficiency temporary blocking agent, studying about selective acidizing technique.Through many trials, the paper synthesized a kind of oil-soluble temporary plugging agent. Conduct experiment to evaluate solubility in diesel, acid resistant, water resistant and dispersity. The paper defines the kind and concentration of suspension stabilizer for the made-up temporary plugging agent. In addition, and estimates the existing oil-soluble temporary plugging agent. The experiment results show that the effect of the made-up temporary plugging agent is very good. With polymer mixed, it becomes fluid suspension. The rate of temporary plugging is more than 93% and the rate of permeability regeneration is more than 85%. It can meet the demands of sites, breaking down selectively in high water-cut oil-wells achieving the purpose of increasing oil production and water control.