Cement additive for the enhanced treatment of oil and gas wells and related methods of use

Abstract

Cement mixtures and methods are disclosed for enhancing fluid loss prevention in oil and gas wells comprising an electrolyte, a polymer and a cross linking agent.

1 . A method for inhibiting fluid loss from an oil and gas well, said method comprising the steps of:
 adding an electrolyte into a cement mixture comprising a cross linking agent and a polymer, and   pumping said cement mixture into said well's borehole to cement at least a portion of a formation face, said cement mixture comprising a polymer composition, wherein polymerization of said polymer is inhibited, thereby inhibiting fluid loss from said well's borehole to said formation.   
     
     
         2 . A fluid loss additive for use in a cement mixture to complete a well bore, said fluid loss additive comprising an electrolyte, a polymer and a cross linking agent. 
     
     
         3 . The fluid loss additive of  claim 2  comprising about 1% electrolyte to about 99% electrolyte, about 1% polymer to about 99% polymer, and about 0.1% cross linking agent to about 5% cross linking agent. 
     
     
         4 . The fluid loss additive of  claim 3 , further comprising at least one of a retarder, a defoamer, and a polyanionic polymer. 
     
     
         5 . A kit for inhibiting fluid loss from an oil and gas well comprising about 1% electrolyte to about 99% electrolyte, about 1% polymer to about 99% polymer, and about 0.1% cross linking agent to about 5% cross linking agent. 
     
     
         6 . A wellbore treated to inhibit fluid loss with the composition of  claim 2 . 
     
     
         7 . A pumpable cement mixture comprising about 0.01% to about 5.0% electrolyte, about 0.01% to about 5.0% polymer, about 0.001 to about 0.1% cross linking agent, about 5% to about 50% water, and about 30% to about 95% cement. 
     
     
         8 . The pumpable cement mixture of  claim 7 , further comprising at least one of a retarder, a defoamer, and a polyanionic polymer. 
     
     
         9 . A completed wellbore comprising the cement mixture of  claim 7 . 
     
     
         10 . A fluid-loss cement additive comprising: about 1 part polyvinyl alcohol, about 1 part NaCl, about 0.05 parts borax, about 0.05 parts calcium lignosulfonate; and about 0.12 parts defoamer. 
     
     
         11 . The fluid-loss additive of  claim 10 , wherein the fluid-loss additive is prepared on a weight basis in a dry blend and added at a concentration of about 1 percent by weight of the cement.