FIELD: oil and gas production. SUBSTANCE: drilling mud containing bentonite mud powder (5-8%), carboxymethylcellulose-600 (0.5-1%) and water further contains furfuryl alcohol (0.1-1%). EFFECT: enabled formation of waterproofing barrier preventing clay from contacting continuous medium of drilling mud and facilitated preparation of the latter due to reduced number of components and their quantities. 1 tbl, 2 tbl
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