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部分水解聚丙烯酰胺（ＨＰＡＭ）的分子量越高，满足流度控制所需要的ＨＰＡＭ的浓度就越低，ＨＰＡＭ用量就少。因此，矿场应用的ＨＰＡＭ的分子量有越来越高的趋势。但是，ＨＰＡＭ分子量越高，其在多孔介质中的滞留量就越易受到注入速度的影响。研究了高温（７２℃）条件下，不同分子量的ＨＰＡＭ在天然岩心中的渗流特性，结果表明：在注入速度为１５ｍＬ／ｈ的条件下，低分子量的ＨＰＡＭ３３３０Ｓ的浓度剖面图基本对称，滞留量为１９．５μｇ／ｇ；高分子量的ＨＰＡＭＳ５２５的浓度剖面图呈明显的前缘滞后和拖尾现象，滞留量为６４．０μｇ／ｇ。把Ｓ５２５溶液的注入速度从１５ｍＬ／ｈ提高到３０ｍＬ／ｈ，Ｃ／Ｃ０值随注入孔隙体积的增大先下降而后上升，滞留量增加了４１．５μｇ／ｇ；当Ｃ／Ｃ０值上升到１后再将注入速度提高到６０ｍＬ／ｈ，浓度剖面图特征与上述基本相同，滞留量又增加了４５．０μｇ／ｇ。３个流速下ＨＰＡＭＳ５２５的总滞留量为１３７．７μｇ／ｇ，呈现出典型的水动力学滞留现象，并且ＨＰＡＭ的分子量越高，岩心渗透率越小，水动力学滞留现象就越明显，滞留量越大。因此在实际应用时，应充分考虑到水动力学滞留现象的有利和不利的影响。图１表１参４（郭海莉摘
The higher the molecular weight of partially hydrolyzed polyacrylamide (HPAM), the lower the concentration of HPAM required to provide flow control and the lower the amount of HPAM. As a result, the molecular weight of HPAM used in mines tends to be higher and higher. However, the higher the molecular weight of HPAM, the more it is retained in the porous media by the rate of injection. The results show that HPAM3330S with low molecular weight is basically symmetrical at a flow rate of 15mL / h, with a retention of 19.5 μg / g. The HPAMS525 concentration profile of the high molecular weight showed obvious leading edge hysteresis and tailing, with a retention of 64.0 μg / g. The injection rate of S525 solution increased from 15mL / h to 30mL / h. The C / C0 value decreased first and then increased with the increase of the injected pore volume, and the retention increased by 41.5μg / g. When C / C0 increased to 1 Then the injection speed was increased to 60mL / h, the concentration profile features the same as above, the retention increased by 45.0μg / g. The total retention of HPAMS525 at 3 flow rates was 137.7 μg / g, showing a typical hydrodynamic retention phenomenon. The higher the molecular weight of HPAM, the lower the permeability of the core and the more obvious the hydrodynamic retention, The bigger Therefore, in practical application, due consideration should be given to the favorable and unfavorable effects of the phenomenon of retention of hydrodynamics. Figure 1 Table 1 Reference 4 (Guo Haili Abstract