DRILLING WASTES UNDERGROUND BURIAL Russian patent published in 2014 - IPC E21F17/16 B65G5/00 

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used in permafrost regions with hydraulically isolated lenses of underground smelt water bearing sand collectors, cryopag (CP), for burial of drilling wastes (DW). Proposed method comprises drilling of one injection well in CP and at least one CP relieving well. Besides, it includes pressure pre-decrease in CP by forcing water-sand pulp via said CP relieving well. Decreased pressure stabilised in injection well, uniform mix of drilling wastes and at least 10 wt. % of crushed ice made from sea water or water pumped from CP with additional of the mix of fluid hydro geological indicator (HGI). Note here that drill wastes are continuously subjected to audio frequency vibrator effects nearby suspended tubing shoe. Injection is continued unless HGI traces appear in pulp forced from relieving well. Then, drilling waste injection into CP, their vibration and pumping of pulp from CP are terminated to eliminate RW. For burial of extra volume of drilling wastes, another RW is constructure to go on injecting of drilling wastes via the same IW with their vibration and application of another RW.

EFFECT: ecologically safe and efficient process.

2 cl, 1 dwg