Using the casing well dynamic tester, the segmental dynamic characteristics test is carried out inside the oil
well perforation section to find and block water in high watercontaining oil well for production and efficiency increasing. The fine water
finding and accurately sealing the water breaking through are completed. 6 formation test points have been tested in two perforation sections of
××× Well in Changqing Oilfield. Five kinds of dynamic characteristic parameter data and real samples have been obtained. The location of water
rushing is located between the lower part of the second perforation section and the high permeability layer. It is the source of the high water
content in the well. According to the two perforating sections, local precision mechanical sealing is carried out. The annual increased output of
crude oil is 255 t, the average daily increased oil is 070 t. The accurate water blocking effect has been achieved. The well dynamic test of the
perforated section with the casing well dynamic tester and the successful test of water shutoff operation have certain reference effects for
similar wells.