FIELD: drilling fluids.
SUBSTANCE: water-based biopolymer drilling fluids used for primary opening of formations, as well as for drilling directional intervals and horizontal sections of oil and gas wells. Biopolymer drilling fluid for the initial opening of formations contains, wt.%: xanthan type “ХС ОНК” biopolymer 0.41-0.45; Reatrol modified starch 1.0-1.5; potassium chloride 8-9; soda ash 0.05-0.18; caustic soda 0.05-0.9; hydrophobic carbonate colmatant D20 5.5-6.5; Lubroil lubricant additive 1.2-3; Penta-480V defoamer 0.03-0.06; bactericide 0.05-0.1; water the rest.
EFFECT: increase in the factor of recovery of the initial permeability of the formation up to 35.6-37.1%.
1 cl, 3 tbl, 4 ex
| Title | Year | Author | Number |
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RU2266312C1 |
