Oilfield wastewater treatment

Abstract

Installations for the treatment of oilfield wastewater have been developed. The article presents a solution of hydrocyclone installations for the treatment of oilfield wastewater based on the use of swirling flows. Due to the centrifugal forces in the hydrocyclone and the turbulent movement of water, the armor shells of oil droplets are destroyed, they are enlarged, and the monodispersity increases. The forces acting in the hydrocyclone are considered, and the efficiency of centrifugal forces in separating solid particles is estimated. The main parameters and requirements for the quality of oilfield wastewater are given, recommended for calculation in the development of new and improving existing oilfield wastewater treatment plants for oil reservoir flooding, which allows increasing oil recovery by 1,5-2 times. Improving the systems of field preparation of products includes both the development of new effective technical means, including hydrocyclones, and the improvement of traditionally used equipment. Gidrocyclone can be used as the main element in the wastewater treatment system, provided that the regime is observed, in which there is no over-dispersion of the remaining oil in the water, (water in oil). Thus, the device implements a mechanism for separating light (oil, gas) and heavier fractions (sediment, water, oil). To protect the environment from reservoir water pollution, the following measures are necessary: ensuring deep treatment of oilfield wastewater; extensive use of anti-corrosion coatings and chemical reagents for corrosion protection of oil-producing equipment; full use of waste water obtained in the field in the reservoir pressure maintenance system; monitoring of the state of surface water and the quality of waste water used in the reservoir pressure maintenance system.