DRY MIXTURE FOR THE PREPARATION OF WELL KILLING FLUID Russian patent published in 2021 - IPC C09K8/42 

FIELD: gas industry.

SUBSTANCE: invention relates to the gas industry, in particular to dry mixtures for the preparation of well killing fluid used in the overhaul of gas and gas condensate wells at low climatic temperatures up to 45°C subzero. The dry mixture for the preparation of the well killing fluid contains the biopolymer “Bioxan”, mustard powder and the protein modifying additive “EST” at the following ratio of ingredients, wt.%: biopolymer “Bioxan” is 8.27-14.43, mustard powder is 81.08-90.23, protein modifying additive “EST” is 1.22-6.31. The dry mixture for the preparation of the well killing fluid may additionally contain up to 25 kg of calcium chloride per 1 kg of dry mixture.

EFFECT: technical result is obtaining a non-caking, non-clumping, highly stable at storage mixture and well killing fluid prepared from the specified mixture, with improved anti-filtration properties and with minimal impact on the permeability of the bottom-hole reservoir zone; ensuring the possibility of regulating the density of the well killing fluid; reducing the time and simplifying the technology of preparing the well killing fluid while ensuring high manufacturability of the well killing fluid from non-deficient reagents; reducing the time of well development; the possibility of using the well killing fluid at low climatic temperatures up to 45°C subzero; expanding the range of reagents; reducing transport costs.

2 cl, 2 tbl, 16 ex