Experimental Study on the Impacts of Suspended Solid Particles in the Reinjection Water on the Reservoir Damage

Abstract

When the suspended solid particles in the reinjection water enter into the reservoir with different permeability, the reservoir will be damaged in different degrees. Taking the reservoir with high permeability in a block of Shengli Oilfield as an example and based on the analysis results of suspended solids content and particle size in the produced fluid, the damage of artificial core permeability has been studied by injecting three different kinds of particle contents with 2 different particle sizes. Different injection rates have been studied as well. The results show that the damage of the suspended solid particles to the reservoir increases with the increase of the injected pore volume and then reaches to a stable value. The larger the core permeability, the smaller the permeability loss. For the core with same level of permeability, the larger the solid particle content and the larger the particle size, the more serious damage of the reservoir. The injection rate of the suspended solid particle has little effect on the damage of the core. Finally, through the interpolation of minimum curvature, the injection pattern of suspended solid particle solution in different permeability reservoirs has been achieved, which will significantly guide the improvement of water injection performance in the oilfield.