TECHNOLOGY OF TEMPORARY PLUGGING ACIDIZATION OF WATER INJECTION WELL AND ITS APPLICATIONS

The Eogene system reservoir of Jizhong oilfield is develoed in a way of multiple-zone production. The outstanding problem is serious interlayer interference with the form of the great intertayer discrepance, serious tonguing and quick water -cut ascending velocity. Conventional commingled acidization or profile regulatiion technology is difficult to solve those problems. Because the interval between layers is too small in this reservoir and operation technology is very complex and difficult, seperate zone acidization or profile regulation technology is unable to be carried out. Through applying temporary plugging acidization technique with advantuges of simple technology and easy to operation,whose principal is temporary plugging higher permeability zone befote acidizing the lower permeability zone, the said problems are solved to a certain extent. This paper gives a minute introduction to the principal and operation technology of this technique, analyses the results of field application.