FIELD: mining.
SUBSTANCE: non-aqueous well maintenance fluid comprises a rheological modifier, wherein the rheological modifier comprises a polysulfide, dimeric acid and polyfunctional amine reaction product containing a molecule with at least two amine groups, the non-aqueous well maintenance fluid comprises a hydrocarbon-based mud. The method of carrying out oilfield processes comprises placing a hydrocarbonaceous mud containing a rheological modifier into a wellbore, the rheological modifier comprises a polysulfide, dimeric acid and polyfunctional amine reaction product containing a molecule with at least two amine groups. The invention is developed in the formula dependent claims.
EFFECT: increased stability of rheological characteristics in environmental conditions.
15 cl, 3 ex, 4 tbl, 4 dwg
