METHOD FOR RECYCLING DRILLING WASTES WITH PRODUCTION OF ENVIRONMENTALLY SAFE MONOLITHIC-ROUND BUILDING MATERIAL Russian patent published in 2020 - IPC C04B20/02 C04B20/10 B09B3/00 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to methods of processing and recycling drilling wastes and can be used in oil-producing and oil-refining industry, in construction of roads and arrangement of cluster sites. Method of recycling drilling wastes to obtain monolithic-coarse building material includes pre-drying drilling wastes in form of drill cuttings to moisture content of 5–10 %, milling dry drilling mud into fractions 1–2 mm to homogeneous state, preparation of sand slurry by mixing dry drilling slime with mineral filler during 1.0–2.0 minutes at temperature of 10–25 °C, preparation of reaction powder mixture by mixing cement with microsilica for 1.0–2.0 minutes at temperature of 10–25 °C, preparation of a complex modifying additive in the form of an aqueous solution of a plasticiser and calcium chloride or sodium chloride, feeding slurry sand and reaction powder mixtures into mixing with further supply to a rotating bladeless granulator-pelletizer, where after final dry mixing during 1.0–2.0 minutes into zone of pellets formation, fine-dispersed complex modifying additive is sprayed, after which granulator-pelletizer is stopped for 10–15 minutes to achieve initial period of pellets setting and outlet of finished hemispherical pellets with size of 1.0–2.0 cm in diameter and their natural hardening at temperature of not less than 15 °C for 20–27 hours with their subsequent movement into storage area for accumulation of finishing strength, wherein building material is obtained at following ratio of components, wt. %: slurry sand mixture consisting of: drilling slurry 29.0–41.0, mineral filler 14.0–20.0; reaction-powder mixture consisting of: binder 24.0–25.0, microsilica 2.0–7.0; complex modifying additive consisting of: calcium chloride or sodium chloride 0.2–0.7, plasticiser 0.1–0.3, water 16.0–20.0. Invention is developed in dependent items of the formula.

EFFECT: technical result is higher efficiency of recycling drilling wastes to obtain environmentally safe monolithic-coarse building material with high operational characteristics.

3 cl, 3 dwg, 1 tbl, 1 ex