FIELD: drilling. SUBSTANCE: plugging liquid has, wt.-%: span piece 4.8-5.2; magnesium chloride 0.8-1.2; ferrous chloride 1.8-2.2; 2-hydroxy-1,3-propylenediamine-tetramethylenephosphonic acid tetrasodium salt 0.8-1.2, and water - the rest. 10%-th aqueous solution of span piece is mixed with tetrasodium salt of 2-hydroxy-1,3-propylenediamin-tetramethylenephosphonic acid of grade DPF-1N. Aqueous solution of magnesium chloride is prepared in which ferrous chloride is added. Mixture of span piece and DPF is added to the salt solution and stirred up to homogeneous system preparing. Properties of plugging liquid: improved insulating properties due to increased plastic strength; dynamic stress of shift is increased after 1 min and 3 h by 10-16 and 12-15 times, respectively; gel-formation time is increased by 15-16 times. EFFECT: improved properties of plugging liquid. 2 tbl
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