DRILLING AGENT Russian patent published in 2009 - IPC C09K8/08 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the field of oil and gas industry, namely, to drilling agents for opening of producing reservoir bed. Drilling agent contains following components, wt %: biopolymer xanthan of brands "Saraksan-T" or "Saraksan" 0.2-0.7; α-glucan 0.2-0.8; salt or mixture of salts of univalent metals 1-55; defoaming agent of brand "Sofeksil-9056-20x" 0.01-0.2; bactericide of brand biocide B-2 0.006-0.008; bactericide of brand biocide SMB 0.1-0.5; water - the rest. As α-glucan, modified starch or dextran is used. As salts of univalent metals, chlorides or nitrates, or nitrites, or thiosulfates, or carbonates, or acetates, or bromides, or sodium or potassium formates, or their mixtures are used.

EFFECT: preparation of drilling agent with adjusted density without solid phase, which preserves its rheological properties for a long time.

4 cl, 4 tbl, 4 ex