PROCESS FOR TREATING OIL-FIELD WASTE WATERS AND PLANT FOR IMPLEMENTATION THEREOF Russian patent published in 2002 - IPC

FIELD: crude oil production. SUBSTANCE: process includes feeding initial waste water into settler as ascending flow, withdrawal of oil, gas, and purified water. According to invention, prior to be fed into settler, waste water is subjected to vacuum treatment in destabilizer following the conditions: P_in≥ 1,05(ρ/2)(α+ε_in)V2W

and P_out≤ 0,95(ρ/2)(1-ε_out-d4m/D_out)V2m, where P_in is inlet pressure in destabilizer, P_out outlet pressure in destabilizer P_in inlet pressure in destabilizer; ρ density of water, α Coriolis coefficient, ε_in coefficient of hydraulic resistance in outlet section V_m water speed in destabilizer mouth; ε_out coefficient of hydraulic resistance inlet section; d_m diameter of mouth, and D_out destabilizer outlet diameter, whereas pressure in settler does not exceed pressure saturation of water with gas before being fed into treatment zone. Waste water treatment plant comprises horizontal settler, destabilizer containing convergent tube conjugated with mouth and having length equal to at least two diameters, diffuser with variable obliquity between 5 and 5 deg. Destabilizer is also provided with driven adjusting needle with variable obliquity between 20 and 8 deg. Settler is provided with interior wall having inclined gutter in its upper part to let liquid overflow. Interior wall separates settler into preliminary and major chambers. The former includes transversal greed. EFFECT: enhanced efficiency of degassing due to vacuum treatment of initial water and use of destabilizer in plant. 2 cl, 1 dwg