The invention discloses a temporary plugging
workover fluid and a preparation method thereof, and belongs to the field of oilfield
chemistry. The temporary plugging
workover fluid comprises, based onthe total weight being 100 parts, 0.96-2.7 parts of flour balls, 0.48-1.35 parts of resin balls, 1.92-4.5 parts of an expansion inhibitor, 0.29-0.45 parts of a suspending agent, 0.19-0.27 parts of a
fiber synergist, 0.10-0.41 parts of a scale inhibitor, 0.19-0.32 parts of a degradation agent and the balance of water. The flour balls are prepared by mixing
wheat flour and floating beads in a
mass ratio of 6: 4 to 7: 3, adding water, and performing mixing, extruding,
cutting, forming and
drying. The density of the flour balls is 0.97-1.02 g / cm<3>, and the particle size of the flour balls is 2-4mm. The resin balls are prepared by mixing
petroleum resin and floating beads in a
mass ratio of 7: 3 to 8: 3, adding isopropanol and a
silane coupling agent, and performing mixing, extruding,
cutting,forming and
drying. The density of the resin balls is 0.97-1.02 g / cm<3>, and the particle size of the resin balls is 3-5mm. The
fiber synergist is
polyvinyl alcohol fiber, the
diameter of the
polyvinyl alcohol fiber is 0.01-0.03mm, and the length of the
polyvinyl alcohol fiber is 3-5mm. The temporary plugging
workover fluid can form a temporary plugging layer which is compact in structure and excellent in
mechanical strength and pressure
bearing capacity, and does not damage a reservoir.