Method of plugging a formation

摘要: A novel composition and method is provided for temporarily plugging wellbores extended periods of time, e.g., up to 10 years more. The comprises a thickened aqueous based mixture containing water-swellable clay inorganic, acid soluble particles, such as minerals, CaCO3, solid constituents. introducing said into well be plugged followed by sufficient amount an medium provide hydrostatic head over in contact with which exerts pressure on greater than the formation at point application. can removed from when desired contacting it acidic solutions.