Cement slurry compositions responsive to hydrocarbon gas

Abstract

Methods and compositions for reducing gas seepage into a cement slurry. One method includes adding a formulation to the cement slurry, the formulation comprising at least one component responsive to a predetermined concentration of hydrocarbon gas in the cement slurry, where upon the cement slurry reaching the predetermined concentration of hydrocarbon gas, the hydrocarbon gas undergoes at least a partial oxidation caused by the formulation to quicken the setting time of the cement slurry via release of heat by an exothermic reaction.

That claimed is: 
     
         1 . A composition for reducing gas seepage into a cement slurry, the composition comprising:
 at least one component responsive to a predetermined concentration of hydrocarbon gas in the cement slurry, where upon the cement slurry reaching the predetermined concentration of hydrocarbon gas, the hydrocarbon gas undergoes at least a partial oxidation caused by the composition to quicken the setting time of the cement slurry via release of heat by an exothermic reaction.   
     
     
         2 . The composition according to  claim 1 , where the composition includes an oxidant and a catalyst. 
     
     
         3 . The composition according to  claim 2 , where the oxidant comprises hydrogen peroxide. 
     
     
         4 . The composition according to  claim 3 , where the catalyst is selected from the group consisting of: a metal-containing heterogeneous catalyst; a metal-containing homogeneous catalyst; and combinations thereof. 
     
     
         5 . The composition according to  claim 4 , where the metal comprises a metal selected from the group consisting of: gold; palladium; platinum; copper; iron; molybdenum; tin; rhodium; ruthenium; and combinations of the same. 
     
     
         6 . The composition according to  claim 5 , where the composition further comprises a strong acid. 
     
     
         7 . The composition according to  claim 4 , comprising the metal-containing heterogeneous catalyst, where the heterogeneous catalyst includes supported nanoparticles. 
     
     
         8 . The composition according to  claim 2 , where at least one component is encapsulated. 
     
     
         9 . The composition according to  claim 1 , where the at least one component comprises between about 1% by weight and about 6% by weight of the cement slurry.