METHOD FOR PREVENTING DEPOSITS OF NON-ORGANIC SALTS Russian patent published in 2013 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: in the method preventing the deposit of non-organic salts in commercial oil and gas equipment including series pumping to the bottomhole zone of formation of solution fringes, solution of inhibitor of salt deposition and hydrophilic displacement fluid; as a solvent, mutual solvent is pumped; salt deposition inhibitor is pumped in water solution of potassium chloride and as hydrophilic displacement fluid there pumped is the above water solution of potassium chloride; at that, as mutual solvent, there pumped is butyl cellosolve or mixture of solvents at the following component ratio, wt %: methanol 10, acetone 50, butyl cellosolve 35, dimethyl sulphoxide 5, salt deposition inhibitor is pumped in water solution of potassium chloride at the component ratio, wt %: salt deposition inhibitor 10, potassium chloride 1-2, fresh water is the rest; as hydrophilic displacement fluid there pumped is 1-2% of potassium chloride solution in fresh water; as salt deposition inhibitor, inhibitor of organophosphorous type is used.

EFFECT: minimisation of risks of damage to the formation owing to changing phase permeabilities and swelling of clays, reduction of corrosion risks and risks due to formation of slightly soluble products of interaction of components of the composition with rocks of the formation and occasionally produced water.

7 ex, 7 dwg