The invention discloses a well-killing
workover method used with water plugging. The well-killing
workover method sequentially comprises the following steps of (1) calculating the use level of required well-killing fluid according to volume of a shaft; (2) determining the density of the well-killing fluid according to formation pressure; (3) determining
polymer gel formula which is not easy to degrade in an operation period at formation temperature according to the formation temperature, or determining a gel
particle type matched with the size of a pore
throat according to characteristics of
porosity-permeability of a reservoir; (4) preparing
polymer gel or gel particle liquor; and (5) pumping the well-killing fluid into the shaft to perform underground construction operation. By the well-killing
workover method, thinking limitation that temporary plugging or
lost circulation prevention is often used to recover capacity in existing well-killing workover is overcome, the
polymer gel or gel particles with a selective water plugging function serves as the well-killing fluid, two yield increasing technologies comprising
oil well water plugging and reservoir temporary plugging protection are combined, a synergistic effect of the two yield increasing technologies is achieved, the capacity after workover of an
oil well is improved to a maximum extent, and the well-killing workover method has a wide application prospect in the field of workover of intermediate-high
water cut oilfields.