FIELD: soil or rock drilling; mining.
SUBSTANCE: invention relates to drilling fluids and can be used in pipeline transport, particularly, in construction of underwater passages of pipelines. Drill mud for construction of underwater passages of pipelines by means of directional drilling method includes treated by formate or sodium acetate dispersed in aqueous solution of calcined soda bentonite clay powder and water-soluble polymer compounds at following ratio of components, wt. %: water 92.8–95.6; calcined soda 0.1–0.2; bentonite mud powder 4–6; sodium formate or acetate 0.2–0.7; water-soluble polymer compounds 0.1–0.3.
EFFECT: technical result is enabling possibility of strengthening uncemented soils and improving drill cuttings carrying capacity.
1 cl, 1 tbl
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