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入井流体进入地层后 ,由于它不同于地层流体的物理性质和化学性质 ,因而会对地层造成一定的损害 ,在低渗透油藏中 ,这种损害尤为严重。室内实验及现场应用表明 ,入井流体的矿化度、pH值、表面张力、固相颗粒尺寸、固相颗粒含量、细菌含量等是对地层造成损害的主要因素。对渤南油田的地层损害进行了定性和定量研究 ,得到了各种因素对地层损害的影响规律。结果表明 ,入井流体的总矿化度大于 80 0 0mg/L ,pH值在 6.5～ 8.5,表面张力小于 35mN/m ,固相颗粒粒径中值小于 4μm ,固相颗粒含量小于 4mg/L ,细菌个数在 1 0 2 个 /mL以内时 ,对地层的伤害可以减小到最低限度。
Intruded fluid into the formation, because it is different from the formation fluid physical and chemical properties, which will cause some damage to the formation, in low permeability reservoirs, this damage is particularly serious. Laboratory experiments and field experiments show that the main factors that cause damage to the formation are the salinity, pH value, surface tension, solid particle size, solid particle content and bacteria content of fluid entering the well. The stratigraphic damage of Bonan oilfield was qualitatively and quantitatively studied, and the influence of various factors on the strata damage was obtained. The results show that the total salinity of the fluid entering the well is more than 80 0 0 mg / L, the pH value is 6.5 to 8.5, the surface tension is less than 35 mN / m, the median diameter of the solid particles is less than 4 μm and the content of the solid particles is less than 4 mg / When the number of bacteria is less than 102 bacteria / mL, damage to the formation can be minimized.