HEAT-RESISTANT BACKFILL MATERIAL FOR FASTENING WELLS, PROVIDING HIGH STRENGTH UNDER CONDITIONS OF CYCLICALLY VARYING TEMPERATURES AND ACTION OF HS AND CO Russian patent published in 2020 - IPC C09K8/467 E21B33/138 

FIELD: construction.

SUBSTANCE: invention relates to well construction technology and can be used for attachment of oil and gas wells, which are operated in conditions of cyclically varying temperatures in range from 25 to 300 °C to improve strength properties of backfill material when exposed to aggressive media – hydrogen sulphide (H₂S) and carbon dioxide (CO₂). Backfill material for well fixation contains, wt%: backfill portland cement of high sulphate resistance – 85–87; quartz flour – 8–10; thermally activated fly ash – 5; water to water-mixture ratio – 0.4.

EFFECT: high-strength backfill stone in bending after hardening and subsequent exposure to several cycles of heating and cooling in the temperature range from 25 to 300 °C with simultaneous exposure to aggressive media of H₂S and CO₂ for a long period of time.

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