FIELD: drilling fluids.
SUBSTANCE: invention relates to water-based inhibitory low-clay polycationic drilling fluids and can be used in drilling of argillaceous and productive deposits and workover of wells, where there are strict environmental requirements. The drilling fluid contains, by % of weight: clay powder 1.6-2.1; chalk 4.1-7.0; starch 0.8-2.1; cationic polymer polyepichlorohydrinadimethylamine in liquid form with an active substance concentration of 30 to 50 % 4.0-5.0; glycerine or propylene glycol 4.0-10.6; cationic polymer Silfok-2540C; the rest is water.
EFFECT: increased efficiency of drilling, as well as improved quality of repair of wells with low formation pressures.
2 cl, 1 tbl
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RU2739270C1 |
Authors
Dates
2023-04-13—Published
2022-04-20—Filed