Liquid nitrogen in well operations

摘要: The invention is concerned broadly with the use of a compressible medium in drilling well or treatment penetrating subterranean formation. Liquid nitrogen and well-treating liquid (including aqueous cement slurries fluids as workover, fracturing, acidizing fluids) are mixed while still liquid, thereafter rapidly becomes gas accompanied by marked cooling treating liquid. injected novel apparatus described. Illustrative operations contemplated hydraulic fracturing. Since cryogenic there particular advantage inherent formation employing improvement that, being low-temperature composition, rate reaction slower. acidized zone may thus be extended greater distance from bore. (3 claims)