METHOD OF DISPOSAL OF WELL DRILLING WASTE INTO ABANDONED WELL Russian patent published in 2017 - IPC B65G5/00 E21B33/13 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to disposal of drilling waste into the abandoned well, in particular in permafrost conditions (PFC). The method of disposing of drilling waste comprises preparing a slurry consisting of drill cuttings (DC) and drilling wastewater (DWW). Then the abandoned well is killed by the prepared pulp by injection into the inner cavity of the production casing into the perforated interval along tubing lowered into the well. Then the cement slurry is injected which is mixed in the water-methanol solution (WMS) or DWW, the well is left for the period of waiting on cement (WOC). After curing of the lower cement plug a new batch of the estimated volume of the pulp is injected, after filling the internal cavity of the production string down to the foot of PFC, above the column of injected part of the pulp the top cement plug is arranged, and on the wellhead either the wellhead assembly with a valve and a blank flange or a concrete pedestal are mounted.

EFFECT: invention consists in improvement of reliability of drilling waste disposal without damaging the environmental safety.

4 cl, 4 dwg