Water soluble perforation pack

Claim 1

In a well completion and workover method wherein a subterranean formation in a well is perforated to provide channels for fluids within said formation to flow to the well bore, the steps comprising: (a) pumping a first treating fluid into the well and contacting said perforation channels with said first treating fluid, wherein said first treating fluid comprises a saturated aqueous saline solution with at least one water soluble particulate sized salt which is substantially insoluble in said saturated aqueous saline solution; (b) filling said perforation channels with said water soluble particulate sized salt which is substantially insoluble in said first treating fluid, wherein said water soluble particulate sized salt has a particle size range such that said perforation channels filled with said water soluble salt have a permeability sufficiently high to affect the easy removal of said water soluble particulate sized salt from said perforation channels when desired; (c) forming a bridge and seal on the surface of said filled perforation channels to bridge and seal off the filled perforation channels by contacting said filled perforation channels with a second treating fluid, wherein said second treating fluid comprises a saturated aqueous saline solution in which the water soluble particulate sized salt filled within said perforation channels is substantially insoluble having suspended therein at least one particulate bridging material having a particle size range such that a low permeability seal of said filled perforation channels is obtained; and thereafter when desired; (d) removing said low permeability seal from the surface of said filled perforation channels; and (e) removing said water soluble particulate sized salt from within said perforation channels by dissolving said water soluble particulate sized salt in a third treating solution in which said water soluble particulate sized salt is soluble.