Biocide for well stimulation and treatment fluids

Abstract

A well stimulation and or treatment fluid that includes water, other additives, and a biocide consisting of 3,5-dimethyl-1,3,5-thiadiazinane-2-thione in an amount effective to inhibit bacterial growth and minimize antagonistic reactions between the biocide and other additives. Also disclosed are well injection compositions, stimulations, squeezing, waterflood, packing, cement compositions, and methods for cementing.

1 . A method of recovering a production fluid from a subterranean formation, comprising: displacing a well injection composition through a wellbore down to the subterranean formation to force or enhance the production fluid from the subterranean formation, the well injection composition comprising an injection fluid and a biocide comprising 3,5-dimethyl-1,3,5-thiadiazinane-2-thione in an amount effective to inhibit bacterial growth. 
     
     
         2 . The method of  claim 1 , wherein the injection fluid comprises an aqueous fluid. 
     
     
         3 . The method of  claim 1 , wherein the injection fluid comprises fresh water or salt water. 
     
     
         4 . The method of  claim 1 , wherein the production fluid is oil and the injection fluid is at least partially miscible with the oil. 
     
     
         5 . The method of  claim 1 , wherein displacing the well injection composition through the wellbore down to the subterranean formation to force or enhance the production fluid from the subterranean formation defines a well injection process, a stimulation, a squeeze process, a waterflood process, or a packing process. 
     
     
         6 . A cement composition comprising:
 a cement; and   a biocide comprising 3,5-dimethyl-1,3,5-thiadiazinane-2-thione in an amount effective to inhibit bacterial growth.   
     
     
         7 . The cement composition of  claim 6 , wherein the cement composition is a squeeze cementing composition. 
     
     
         8 . The cement composition of  claim 6 , further comprising a fluid for making the cement composition flowable. 
     
     
         9 . A method of cementing, comprising:
 injecting a cement composition into a permeable zone of a wellbore, the cement composition comprising a cement and a biocide comprising 3,5-dimethyl-1,3,5-thiadiazinane-2-thione in an amount effective to inhibit bacterial growth; and   allowing the cement composition to set.   
     
     
         10 . The method of  claim 9 , further comprising providing the cement composition in dry form and combining the cement composition with a fluid before said injecting. 
     
     
         11 . The method of  claim 9 , wherein a cement sheath is located in an annulus of the wellbore, and wherein a conduit is located inside the cement sheath. 
     
     
         12 . The method of  claim 11 , wherein the permeable zone is in the cement sheath. 
     
     
         13 . The method of  claim 11 , wherein the permeable zone is in the conduit. 
     
     
         14 . The method of  claim 11 , wherein the permeable zone is between the cement sheath and the conduit. 
     
     
         15 . The method of  claim 11 , wherein the set cement composition substantially plugs the permeable zone.