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悬浮物的质量浓度及粒径是注入水水质的重要指标,是造成地层损害的重要因素。在目前中国油田执行的行业标准中,对于渗透率大于600×10-3μm2的储层,笼统采用相同的水质标准不合适,给矿场水质指标优化带来一定困难。为了有效地保护储层,必须确定合理的水质指标,系统地研究悬浮物粒径与储层孔喉匹配关系。通过对渤海油区大量砂岩压汞曲线进行归纳,特别是对高渗透和特高渗透储层的孔喉结构参数进行了系统统计,结合过滤理论,提出了根据主流喉道半径优化悬浮物粒径中值的原则和依据。当悬浮物粒径中值小于1/10主流喉道时,才能能顺利通过岩石孔喉。根据孔喉分布大小和动态评价实验结果,推荐了不同类型渗透率储层允许通过的最佳悬浮物粒径中值:低—中渗透储层的最大值为2.5μm,中等渗透储层的最大值为3.0μm,中—高渗透储层的最大值为3.5μm,高渗透储层的最大值为4.0μm,特高渗透储层的最大值为5.5μm。
The mass concentration and particle size of suspended solids is an important indicator of water quality, which is an important factor causing formation damage. In the current industry standards executed by Chinese oilfields, the general adoption of the same water quality standards for reservoirs with permeability greater than 600 × 10-3μm2 is unfavorable, which brings some difficulties to the optimization of mine water quality indicators. In order to effectively protect the reservoirs, it is necessary to determine a reasonable water quality index and systematically study the matching of the particle size of the suspended matters and the pore throats of the reservoir. Based on the summary of a large number of sandstone mercury injection curves in Bohai oilfield, especially for the pore-throat structure parameters of high-permeability and ultra-high permeability reservoirs, a systematic statistical analysis was made. According to the filtration theory, the optimization of the particle size The value of the principle and basis. When the median diameter of suspended solids less than 1/10 of the mainstream throat, can successfully pass through the rock pore throat. According to the distribution of pore-throat size and dynamic evaluation of the experimental results, we recommend that the median particle size of the optimal suspended particles allowed to pass through different types of permeability reservoirs: the maximum of low-medium permeability reservoir is 2.5μm, the maximum of medium-permeability reservoir The maximum value of medium-high permeability reservoir is 3.5μm, the maximum of high-permeability reservoir is 4.0μm, and the maximum of ultra-high permeability reservoir is 5.5μm.