A wellbore fluid includes a base fluid and an emulsifier composition comprising an emulsifier and glycerol. The emulsifier comprises a reaction product of a bis-amide and at least one of maleic acid, maleic anhydride, fumaric acid, succinic acid, or succinic anhydride. The bis-amide includes a reaction product of one or more fatty acid esters and a polyalkylamine. Related methods of operating a wellbore and forming the emulsifier composition are also disclosed.

The invention relates to a water-soluble polymer comprising a main chain which consists of a carbon chain with at least 16 carbon atoms and polyether side chains, wherein hydroxamic acid groups or their salts are attached to the main chain. Further disclosed is an inorganic particle composition comprising the water-soluble polymer. A further aspect of the present invention is the use of the water-soluble polymer of the invention as dispersant in inorganic particle compositions.

The invention relates to a water-soluble polymer comprising a main chain which consists of a carbon chain with at least 16 carbon atoms and polyether side chains, wherein hydroxamic acid groups or their salts are attached to the main chain. Further disclosed is an inorganic particle composition comprising the water-soluble polymer. A further aspect of the present invention is the use of the water-soluble polymer of the invention as dispersant in inorganic particle compositions.