FIELD: drilling fluids.
SUBSTANCE: invention relates to reagents for treatment of polycationic drilling mud in order to neutralize cement that got into the mud, for example, when drilling out cement cups and bridges, during well cementing. Reagent for cement neutralization in polycationic drilling fluids contains, wt %: cationic copolymer Silfok-2540C 10-13; acetic acid 30-45; water - the rest.
EFFECT: neutralization of cement without precipitation of calcium cations while improving the filtration index and thixotropy.
1 cl, 3 tbl
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