LIME DRILL FLUID FOR TOTAL OVERHAUL OF WELLS Russian patent published in 2019 - IPC C09K8/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular to drill fluids, flushing and process fluids used in the completion and total overhaul of oil and gas wells with low layered pressures, with reservoir temperature up to 110 °C, with medium and low permeable reservoirs on hydrogen sulfide-containing fields. Lime drill fluid for total overhaul contains, in wt.%: quicklime 4; hydroxyethyl cellulose 0.5; caustic soda (sodium hydroxide) 0.3; fresh water (technical) or mineralized brine (brine) the rest being.

EFFECT: ensuring the safety of personnel by binding hydrogen sulphide into the well bore, improving the economic efficiency of the well total overhaul by reducing the number of components of the drill fluid without degrading the flow and filtration parameters, as well as the use of cheap non-deficient domestic materials, allowing to preserve the reservoir properties of productive layers.

1 cl, 1 tbl