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当含有固相颗粒的注入水进入地层时 ,水中的固相颗粒将不同程度地滞留在孔隙网络中 ,使地层渗透能力下降。分析胜利油田商三区和胜二区注入水中固相颗粒分布特征、地层孔喉特征 ,以此为基础 ,采用实验方法研究注入水中固相颗粒与岩石孔喉的匹配关系 ,分析固相颗粒损害地层的机理。研究结果表明 :从水站到注水井 ,注入水水质沿流程变差 ;在双对数坐标下 ,商三区和胜二区岩石孔喉半径与渗透率存在线性关系 ;当水质一定时 ,微小粒径的固相颗粒进入岩石孔隙内部形成深部损害 ,粒径较大的固相颗粒只能在岩石表面和浅表部位附着或桥堵而形成表面 (层 )损害。根据架桥法则 ,确定了商三区和胜二区注入水中固相颗粒指标。图 3表 3参 4
When the injected water containing solid particles enters the formation, the solid particles in the water will remain in the pore network to some extent, and the permeability of the formation will decrease. Based on the analysis of the distribution characteristics of solid particles and pore throat characteristics of injected water in Shangsan and Shengsheng two areas of Shengli Oilfield, the matching relationship between solid particles injected into water and pore and throat of rock was studied by using experimental method. The damage of solid particles Formation mechanism. The results show that the quality of injected water changes along the process from the water station to the injection well. Under double logarithmic coordinates, there is a linear relationship between the rock throat radius and permeability of Shangsan and Shengshen-2; when the water quality is constant, Particle size of the solid particles into the rock pore to form deep damage within the larger particle size of the solid phase particles can only be attached to the rock surface and superficial sites or bridging the formation of surface (layer) damage. According to the bridging rule, the indexes of solid particles injected into water in Shangsan and Shengsan areas were determined. Figure 3 Table 3 Reference 4