Suspended Mud To Filter Oil Containing Waste Water

With the developing of water-flooding oilfield to the high water producing period, the water treatment becomes a tough problem. Because the quality of injecting water for flooding needs to be upgraded and meet the need of complicated reservoir condition, many technical researches have been carried out in almost all the domestic oilfields and a relatively complete technology of water treatment has been performed. The conventional treatment of produced water for injection use is THREE PHASES method, the process flow is shown as : buffering-sedimentation-filtering. This conventional method can make the treated produced water meet the need of medium-to-high permeability reservoirs but not the medium-to-low ones, because this method still has some defects in technology, short lifespan of pressure filtering equipment and the bad adaptability of chemical agent on oilfield site, etc. Furthermore, the reservoir condition and the produced water become more and more complicated and variable, some main problems of water treatment should be tackled, especially in low permeability oilfield.To solve the problems mentioned above, a pilot field trial named SUSPENDED MUD TO FILTER OIL CONTAINING WASTE WATER has been performed. This technology adopts physical and chemical (water purified additive) methods to absorb some of the dissolved damage waste and gel particles to form suspended mini-particles and separate from the produced water. And then coagulator is added to make all the gel particles and suspended mini-particles to form mass and dense floccules. At last, the floccules separate from the water rapidly in the filtering equipment according to hydrodynamics effects. The processed water is in accordance with the standard (SY/T5329-94) A. This technology provides a simplified process flow, more effective result and low cost method to meet the need of water flooding reservoirs.