Well completion and workover method

E - Fixed Constructions – 21 – B

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166/25

E21B 43/27 (2006.01)

Patent

CA 1156551

ABSTRACT OF THE DISCLOSURE A well completion and workover method wherein a sub- terranean formation is contacted with a high density, nondamaging treating fluid which comprises a saturated, aqueous saline sol- ution with at least one water soluble salt that is substantially insoluble in the saturated saline solution. The water soluble salt has a particle size range of about 5 microns to about 800 microns, and greater than about 5 percent of the particles are coarser than 44 microns to control the pressure in the formation; to bridge and seal off the formation; to avoid particle invasion; and also to minimize fluid loss to the formation. A minor amount of a fluid loss additive is included in the treating fluid to in- hibit loss of fluid into the formation and a minor amount of a suspension additive is included in the treating fluid to prevent settling of the water soluble salt particles in the aqueous saline solution. The aqueous saline solution should have a den- sity of at least about 10 pounds per gallon,

379822

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