| 摘要 |
FIELD: oil and gas industry.SUBSTANCE: invention can be used under conditions of abnormal high formation pressure and high temperatures for primary and secondary drilling-in, for well killing and for various operations, including in multi-pay wells, having different formation pressure and permeability. Composition for preparation of heavy process liquid for completion and repair of oil&gas wells consists of, wt %: calcium chloride 25.7-40.8; calcium nitrate 12.9-24.4; zinc chloride 38.1-60.0; zinc oxide 0.3-0.7; sodium thiosulfate 0.1-0.7.EFFECT: consistency of solution with formation water, no sediment when solutions are diluted with water, prevention of formation pores from irreversible clogging with solid particles, low crystallisation and corrosion of solutions, reduced energy consumption due to faster dissolution of the composition because of temperature increase for dissolution of metal chlorides.1 tbl, 7 ex |
