真35 断块储层渗透率与KY聚合物相对分子质量的匹配性研究

Research on Compatibility between Permeability of Zhen35 Fault Block Reservoir and KY Polymer Molecular Weight

付美龙 龚波涛 胡泽文 舒雪琴 刘传宗

FU Meilong GONG Botao HU Zewen SHU Xueqin LIU Chuanzong

为了筛选适合真35 断块储层的KY系列聚合物，测定了岩心的气/液（汞）测渗透率、孔隙度及KY系列聚合物在地层条件下的水动力学半径，建立了真35-6 井岩心气测渗透率Kg、平均孔喉半径R及KY系列聚合物相对分子质量M、聚合物在江苏油田真35 断块的地层水中分子水动力学半径Rh之间的关联性，在此基础上根据1/3 架桥堵塞理论获得满足驱替要求的KY系列聚合物相对分子质量与岩心气测渗透率Kg的关系。研究结果表明，真35 储层的气测渗透率与平均孔喉半径成线性相关的关系(R=0.026Kg+0.2071)，KY系列聚合物的水动力学半径与其相对分子质量存在对数相关关系（R=0.1212lnM-0.6831）。真35 断块实施KY聚合物驱时储层气测渗透率与KY系列聚合物相对分子质量应满足的匹配关系为：M<615e0.01Kg， 即KY聚合物的相对分子质量应不超过此上限，从而可以避免因选择相对分子质量过大的聚合物而导致的油层堵塞。图2 表3 参9

To choose the KY series of polymers suitable for Zhen 35 fault block reservoirs from Jiangsu oilfield, the gas logging permeability and liquid (Hg) permeability, porosity, and the hydrodynamic radius of the KY series polymer under formation conditions of hen 35-6 well was measured and the relationship of the gas logging permeability (Kg) with the average pore throat radius(R-), and the relationship of the relative molecular mass (M-) of KY polymer and the molecular hydrodynamic radius (Rh) in the formation water of the Zhen 35 fault block reservoirs was created, furtherly, according to the theory of 1/3 bridging action, the relationship between Kg of the cores and M- of KY polymers was created. The results showed that there was a linear correlation between Kg and R- of the cores: R-=0.0026 Kg+0.2071,and the Rh of the KY polymer in the formation water of the Zhen 35 fault block reservoirs had a logarithm correlation with its M-：Rh=0.1212lnM- -0.6831. According to the stable plugging mechanism of the polymer to the pore throat that when the condition is Rh≥0.46R-, a stable plugging will be formed, the matching formula between Kg of the cores from Zhen 35 fault block reservoir and M- of KY polymers was obtained synthetically as follows, M-<615e0.01Kg，in other words, the M- of KY polymers should be lower than the upper limit, so that it is possible to avoid the blockage problem of the reservoir due to choosing the polymer with excessively high relative molecular mass.

10.19346/j.cnki.1000-4092.2016.04.021