FIELD: oil and gas industry.
SUBSTANCE: invention relates to drilling fluids, which are water-based and can be used when drilling oil and gas wells in the conditions of exposure to abnormally high reservoir pressures and temperatures up to 150 °C. Hydro-magnesium drilling fluid includes water, caustic soda, sodium chloride, magnesium chloride and a stabilizer. As a thermo-resistant stabilizer, a thermo-resistant polyelectrolyte Silfok-2540C is added in the following ratio of components, parts by weight: Silfok-2540C copolymer 12–15; magnesium chloride 15–20; caustic soda 2–2.5; sodium chloride 30; water 100.
EFFECT: improved thermal stability of the solution for drilling chemogenic layers and unstable clay rocks.
1 cl, 1 tbl
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RU2775214C2 |
