PLUGGING MATERIAL FOR INFLOW SHUTOFF AND LIMITATION TO OIL AND GAS WELLS Russian patent published in 2016 - IPC C09K8/467 

FIELD: oil and gas industry.

SUBSTANCE: plugging material contains as binding base substance caustic magnesite, magnesium chloride, water, bentonite clay and additive regulating thickening and setting time - sodium tetraborate dihydrate - sodium borate; it is featured by inclusion of additional gypsum binding agent of brand of at least G-7 with the following ratio of components, wt %: caustic magnesite 20.0-35.0, bentonite clay 0.1-10.0, sodium tetraborate dihydrate - sodium borate 0.01-0.55, magnesium chloride 12.0-35.0, gypsum binding agent of brand of at least G-7 1.5-9.5 , water - the remaining share.

EFFECT: manufacturing plugging material based on caustic magnesite, which solution is characterised by lower density, sedimentation stability and acceptable setting time at low positive temperature.

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