Research And Application Of Temporary Plugging And Acidizing Technology For Jing-an Oilfield

Acidification is the main technical measures in low permeability reservoir reconstructionprocess. However, water cut also sharp increased in the low permeability heterogeneoussandstone reservoir in Jing-an oilfield after conventional acidizing. The main reason for thisproblem is that acid flow into high permeability formation, but rarely flow into low permeableformation, which lead the physical properties of high permeability zone is largely improved,but physical properties of the low permeability zone seldom improved, thus interlayerheterogeneity is increasing. And the oil in the relatively low permeability layer is seldom used.In order to solve this problem, temporary plugging and acidizing technology is proposed inJing-an oilfield. On the one hand, t optimization the temporary plugging agent in order toplugging high permeability layer effectively through the indoor experiment. On the other hand,Optimization of acid formula improve the effect of acidification, thus to improve permeabilityof low permeability layer. Field test and application show that the temporary plugging andacidizing technology in Jing-an oilfield has obtained the good effect of water control and addoil, which also has a very important significance for the development of low permeabilityoilfield, extend the production period, low water cut, etc.