Rheology Modifiers

Abstract

A non-aqueous wellbore servicing fluid comprising a rheology modifier wherein the rheology modifier comprises a reaction product of a polysulfide, a dimer acid and a polyfunctional amine. A method of conducting an oilfield operation comprising placing an oil-based mud comprising a rheology modifier into a wellbore wherein the rheology modifier comprises a reaction product of a polysulfide, a dimer acid and a polyfunctional amine.

What is claimed is: 
     
         1 . A non-aqueous wellbore servicing fluid comprising a rheology modifier wherein the rheology modifier comprises a reaction product of a polysulfide, a dimer acid and a polyfunctional amine. 
     
     
         2 . The fluid of  claim 1  wherein the rheology modifier is present in the wellbore servicing fluid in an amount of from about 0.02 wt. % to about 2.2 wt. % based on the total weight of the wellbore servicing fluid. 
     
     
         3 . The fluid of  claim 1  wherein the polysulfide comprises di(hydroxyethyl)polysulfides, di(hydroxyethyl)disulfide, di(hydroxyethyl)trisulfide, di(hydroxyethyl)tetrasulfide or homopolymers thereof. 
     
     
         4 . The fluid of  claim 1  wherein the polysulfide is characterized by general Formula I or Ia: 
       
         
           
           
               
               
           
         
       
       where each R, R′ and R′″ can be independently selected from the group consisting of hydrogen and an organyl group and x has an average value greater than 2. 
     
     
         5 . The fluid of  claim 1  wherein the dimer acid comprises a C12-C24 unsaturated fatty acid. 
     
     
         6 . The fluid of  claim 1  wherein the polyfunctional amine comprise a molecule containing at least two amine groups. 
     
     
         7 . The fluid of  claim 1  wherein the nonaqueous wellbore servicing fluid comprises an oil-based mud. 
     
     
         8 . The fluid of  claim 1  having a variation in yield point of less than about 20% over a temperature range of from about 100° F. to about 430° F. 
     
     
         9 . The fluid of  claim 1  having a variation in gel strength of less than about 20% over a temperature range of from about 100° F. to about 430° F. 
     
     
         10 . The fluid of  claim 1  wherein the rheology modifier functions as a corrosion inhibitor. 
     
     
         11 . A method of conducting an oilfield operation comprising:
 placing an oil-based mud comprising a rheology modifier into a wellbore wherein the rheology modifier comprises a reaction product of a polysulfide, a dimer acid and a polyfunctional amine.   
     
     
         12 . The method of  claim 11  wherein the oilfield operation is a maritime oilfield operation. 
     
     
         13 . The method of  claim 11  wherein the rheology modifier is present in the oil-based mud in an amount of from about 0.02 wt. % to about 2.2 wt. % based on the total weight of the wellbore servicing fluid. 
     
     
         14 . The method of  claim 11  wherein the polysulfide comprises di(hydroxyethyl)polysulfides, di(hydroxyethyl)disulfide, di(hydroxyethyl)trisulfide, di(hydroxyethyl)tetrasulfide or homopolymers thereof. 
     
     
         15 . The method of  claim 11  wherein the oil-based mud has a variation in yield point of less than about 20% over a temperature range of from about 100° F. to about 430° F. 
     
     
         16 . The method of  claim 11  wherein the oil-based mud displays a flat rheology. 
     
     
         17 . The method of  claim 11  wherein the oil-based mud is subjected to cyclic temperature stresses. 
     
     
         18 . The method of  claim 17  wherein the oil-based mud has a variation in yield point of less than about 20%. 
     
     
         19 . The method of  claim 11  wherein the oil-based mud has a variation in gel strength of less than about 20% over a temperature range of from about 100° F. to about 430° F. 
     
     
         20 . The method of  claim 11  wherein the dimer acid comprises a C12-C24 unsaturated fatty acid.