FIELD: chemistry.
SUBSTANCE: invention relates to oil and gas industry, particularly to spacer fluids used in packing-off underground reservoirs in rock salt. The spacer fluid used in packing-off an underground reservoir filled with brine contains the following, wt %: aqueous polyurethane dispersion Aquapol 10 100, mud powder Bentokon "Super 200" 9-11, Praestol 2510 0.13-0.15, acrylamide polymer AK 631 0.03 -0.06, modified sodium silicate Monasil 0.02-0.05.
EFFECT: high efficiency of packing-off an underground reservoir filled with brine owing to use of a spacer fluid with improved processing properties due to high stability of its phase composition, capability of preventing contact between the cementing slurry used in pack-off and brine, high carrying capacity and cutting material costs.
3 ex
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