FIELD: oil and gas industry.
SUBSTANCE: water-based high-mineralized weighted mud includes water, biopolymer, a mixture of two or three monoacid calcium salts and calcium carbonate additionally, a lubricant and polymer composition TSEPS-S containing 80-90 wt % of hydrolyzed cyanoethylated polyvinyl alcohol synthesized by interaction of acrylonitrile with polyvinyl alcohol in aqueous alkali medium and 10-20 wt % of oxyethyl cellulose with the following ratio of the mud components, wt %: biopolymer 0.2-0.3, TSEPS-S with the above composition 0.2-0.3, calcium carbonate 3-5, lubricant 0.5-1.0, a mixture of two or three monoacid calcium salts 24-52, water - the remaining weight.
EFFECT: reduction of high-temperature filtration coefficient for the drilling mud.
5 cl, 5 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| POLYMERIC COMPOSITION FOR HIGHLY MINERALISED WATER-BASED WEIGHTED DRILLING FLUIDS | 2013 |
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| CLAYLESS LOADED DRILLING MUD | 2011 |
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| BIOPOLYMER DRILLING MUD SBK-UNI-DRILL-PRO (HARD) | 2013 |
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RU2561630C2 |
