DRILLING FLUID Russian patent published in 2020 - IPC C09K8/12 

FIELD: chemistry.

SUBSTANCE: invention relates to compositions of drilling mud and can be used in oil and gas industry for opening productive formations, including during drilling of horizontal and lateral shafts in various hydrogeological conditions. Drilling fluid contains, wt%: biopolymer of xanthan row 0.29; polyanionic cellulose 0.39; inhibiting additive – potassium chloride 2.9; carbonate weighting material 4.9; modifier – copolymer of vinyl alcohol and acrylic acid hydrazide with ratio of links of hydrazide of acrylic acid and vinyl alcohol equal to 1:16, 0.1–0.19; water – balance.

EFFECT: high stability of the drilling fluid for delamination, high efficiency of the drilling mud when used, processibility of the preparation process, low material consumption, wider range of drilling fluids.

1 cl, 1 tbl, 3 ex