Weighted zero solids loss circulation, fluid loss and insulating annular space fluid systems

Abstract

Loss circulation fluids contain aqueous based compositions having at least one alkali metal formate and at least one thermally activated self-crosslinkable gel forming material, wherein the composition is easily transported to a loss circulation zone and yet has ability to close off the loss circulation zone once thermally activated to reduce the loss of circulation fluids into flow passages of a subterranean formation. In addition, packer fluids contain aqueous based compositions which contain at least one alkali metal formate and at least one thermally activated self-crosslinkable gel forming material, wherein the packer fluid forms a thermal insulating fully hydrated gel once thermally activated.

Dependencies are inferred from the claim text.