KILL FLUID FOR GAS AND GAS CONDENSATE WELLS, METHOD OF ITS OBTAINMENT Russian patent published in 2009 - IPC C09K8/42 

FIELD: chemistry.

SUBSTANCE: fluid is intended fir killing productive clay sandstones with gas saturation and acidic character of residual pore waters. Method of obtaining kill fluid for gas and gas condensate wells involves component dissolution in water medium and sequential mixing. Chrysotile asbestos is matured for 6-8 hours in water solution of aluminium sulfate, ground in dispersion device, obtained aluminised asbestos suspension is processed by calcium salt of nitryltrimethylphosphonic acid obtained by dissolving potassium hydroxide, nitryltrimethylphosphonic acid and calcium chloride in water. Obtained aluminophosphonic suspension is mixed with solution obtained by dissolving carboxymethylcellulose (CMC), hydroxyethylcellulose (HEC) and potassium chloride in water, then potassium carbonate is added to the obtained composition at the following component ratio, wt %: CMC 1.4-1.6, HEC 0.4 -0.5, potassium chloride 6.8 -7.1, chrysotile asbestos 0.45-0.55, aluminium sulfate 0.45-0.55, potassium hydroxide 0.9 -1.1, nitryltrimethylphosphonic acid 0.9 -1.1, calcium chloride 0.9 -1.1, potassium carbonate 0.40-0.50, the rest is water. Kill fluid for gas and gas condensate wells is obtained by the claimed method.

EFFECT: enhanced sedimentation resistance.

2 cl, 2 ex, 4 tbl