DRILLING WASTE NEUTRALISATION METHOD AND PLANT FOR ITS IMPLEMENTATION Russian patent published in 2014 - IPC B09B3/00 

FIELD: oil and gas industry.

SUBSTANCE: high-mineralised drilling wastes subjected to neutralisation are treated by inertisation method after washing from salts and separation of solid and liquid phases. A solid phase at moisture content of 40% is mixed thoroughly during 2-3 minutes with introduction of a consolidating compound in quantity of at least 20% by weight. The consolidating compound consists of 40-80 weight parts of a binding agent - cement of PTS M-500 grade and 20-60 weight parts of a sorbent in the form of a finely dispersed active additive - gaize. A hardening agent solution (liquid soda glass) is added in quantity of 10-20% of the dry hardening agent and mixed thoroughly during 5-7 minutes. The liquid phase is directed to a staged treatment, at first by a method of fine mechanical treatment by centrifuging, then by clarification by means of separation and sorption filtration. The paste-like residue formed in result of centrifuging and thickened fraction after separation and sorption filtration are delivered to inertisation again. A drilling waste neutralisation plant consists of a receipt unit, a unit of course mechanical treatment for separation of solid and liquid phases, pressure lines, tanks, pumps and gates. The unit of coarse mechanical treatment is equipped with a screen separator, a sand separator and a sludge separator. The plant contains additionally a solid phase inertisation unit, a liquid phase fine treatment unit, a liquid phase clarification unit and tanks for receipt of the separated phases. The solid phase inertisation unit is connected to the receipt unit, units of coarse and fine treatment and the liquid phase clarification unit.

EFFECT: reduction of labour intensity, reduction of time required for neutralisation of drilling wastes.

4 cl, 1 dwg, 3 tbl