Key words: light-weight backfill mortar, hollow glass microspheres, Arctic grouting cements, antifreeze additives, cementing of permafrost well zones.
The paper considers the problem of cementing of oil and gas wells under difficult geological conditions when the well profile comes through the permafrost zones and the seams with low bearing capacity. It was shown that the optimal solution for cementing of such wells is the use of light-weight backfill mortars with antifreeze additives. Hollow glass microspheres are suggested to be used as a light-weight aggregate. It is shown that a higher consumption of antifreeze additives significantly reduces the strength of backfill stone and affects much the setting time and thickening time. The method of testing of backfill cements for the permafrost conditions, which takes into account the actual temperatures in the well and assumes lowering of the temperature during the curing time of the backfill stone was suggested. The aforesaid methodology was used to test the developed backfill mortars with hollow glass microspheres and antifreeze additives. It was found that for all tested antifreeze additives, the optimal results were obtained for the potash additive with a retarder for backfill mortars.
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