疏水缔合聚合物驱油能力的三种重要影响因素

根据三次采油的特点,研究了表面活性剂与疏水缔合聚合物(HAP)的相互作用以及HAP的吸附和临界缔合浓度对HAP驱油能力的影响。微量阳离子表面活性剂、非离子表面活性剂和复合型表面活性剂均能使HAP溶液粘度大幅度降低。原油的活性组分可生成上述物质,油田水处理也可能引入微量表面活性剂,所以这些影响因素不可忽略。HAP的结构特征使其在岩石矿物表面的吸附量约为部分水解聚丙烯酰胺的1.7倍。根据HAP的缔合特性要求,其驱油体系的有效浓度须高于缔合浓度,以保证足够的驱油能力。这些不利因素的存在大大增加了HAP增粘体系在油田应用的难度。

Three key factors influencing oil-displacement capacity in hydrophobically associating polymer flooding

The effects of critical associating concentrations (CAC) of hydrophobically associating polymer (HAP),interaction of surfactants with HAP and HAP adsorption on oil-displacement capacity in hydrophobically associating polymer flooding were studied according to the specialty of tertiary oil recovery. The viscosity of HAP solution would decrease greatly with minim of cationic surfactants,non-ionic surfactants and complex surfactants respectively.The effects of such kinds of surfactants produced from active components in crude oil or introduced from water treatment in oilfields could not be neglected.Due to the characteristic of HAP molecular structure,the adsorption of HAP on the surface of reservoir rock is about 1.7 times of partially hydrolyzing polyacrylamide (HPAM).It is necessary to keep the effective concentration of HAP higher than the CAC for getting enough oil-displacement capacity in HAP flooding. The three adverse factors make it difficult to use HAP as a thickening agent in enhanced oil recovery projects of oilfields.