Hydrophobic coating of particulates for enhanced well productivity

Abstract

Compositions and methods for coated or uncoated particulates, such as proppants, are provided that can, among other things, provide a hydrophobic surface that can enhance well productivity and other compositions and methods are disclosed.

1 - 22 . (canceled) 
     
     
         23 . A coated particulate, wherein the coating comprises a mixture a polybutadiene and fumed silica. 
     
     
         24 - 30 . (canceled) 
     
     
         31 . A method of extracting oil and/or gas from a subterranean stratum, the method comprising:
 injecting into the subterranean stratum a coated particulate of  claim 23 ; and   extracting the oil and/or gas from the subterranean stratum.   
     
     
         32 . The method of  31 , further comprising injecting a gas into the subterranean stratum after the injection of the coated particulate. 
     
     
         33 . A method of cleaning out a well bore comprising a coated particulate of  claim 23 , the method comprising injecting a gas into the well bore to suspend the coated particulates in the well bore and displacing the coated particulate from the well bore. 
     
     
         34 . A method of preparing coated particulates of  claim 23 , the method comprising mixing a polybutadiene and fumed silica with the particulates to produce the coated particulates. 
     
     
         35 . (canceled) 
     
     
         36 . A coated particulate comprising a particulate core coated with an optional compatibilizing agent and a hydrophobic polymer coating the particulate core, wherein a portion of the hydrophobic polymer is exposed to provide an exposed hydrophobic surface of the coated particulate. 
     
     
         37 . The coated particulate of  claim 36 , wherein the compatibilizing agent binds the hydrophobic polymer to the particulate. 
     
     
         38 . The coated particulate of  claim 36 , wherein the compatibilizing agent is an alkoxysilane, a surfactant, an alkoxylated alcohol, or an acrylate polymer, or any combination thereof. 
     
     
         39 . The coated particulate of  claim 38 , wherein the alkoxysilane is a methoxysilane, ethoxysilane, butoxysilane, or octoxysilane. 
     
     
         40 . (canceled) 
     
     
         41 . The coated particulate of  claim 38 , wherein the surfactant is a hydroxysultaine. 
     
     
         42 - 44 . (canceled) 
     
     
         45 . The coated particulate of  claim 36 , wherein the hydrophobic polymer is a polyurethane. 
     
     
         46 . The coated particulate of  claim 36 , wherein the hydrophobic polymer is a non-siloxane hydrophobic polymer. 
     
     
         47 . The coated particulate of  claim 36 , wherein the hydrophobic polymer is a cured hydrophobic polymer. 
     
     
         48 . The coated particulate of  claim 36 , wherein the hydrophobic polymer is a polybutadiene. 
     
     
         49 . The coated particulate of  claim 36 , wherein the hydrophobic polymer is a cured polybutadiene. 
     
     
         50 . The coated particulate of  claim 36 , wherein the % wt of the hydrophobic polymer is less than or equal to 0.5% wt of the particulate. 
     
     
         51 . The coated particulate of  claim 36 , wherein the coated particulate is substantially free of a hydrogel or free of a frother. 
     
     
         52 - 53 . (canceled) 
     
     
         54 . The coated particulate of  claim 36 , wherein the particulate core is sand. 
     
     
         55 - 68 . (canceled) 
     
     
         69 . A method of extracting oil and/or gas from a previously fractured subterranean stratum comprising proppants, the method comprising:
 injecting into the previously fractured subterranean stratum comprising proppants a coated particulate comprising a particulate core with an optional compatibilizing agent and a hydrophobic polymer coating the particulate core, wherein a portion of the hydrophobic polymer is exposed to provide an exposed hydrophobic surface of the coated particulate; and   extracting the oil and/or gas from the previously fractured subterranean stratum.   
     
     
         70 . The method of  claim 69 , further comprising injecting a gas with or after the injection of the proppants. 
     
     
         71 - 82 . (canceled)