Abstract To meet the harsh water plugging conditions for a crack fracture-type rock reservoir of Tahe oilfield in China, which are high temperature, high salinity and above 4000 m underground, a novel delay-expansion water-swelling rubber/OMMT (DWSR) with silty-resistant and lower hydrophilic resin migration behavior was developed. HNBR, semi-HEMA@PU, polyacrylamide (PAM), OMMT and other rubber additives were mechanically blended in an open mill mixer. The semi-HEMA@PU blocked by double bond and isocyanate group was prepared by the reaction of NCO group (50% mole fraction) with hydroxyethyl methacrylate. The semi-HEMA@PU reacted with the amino group from PAM and the unsaturated double bond of HNBR, respectively. A crosslink network constructed among PU, PAM and HNBR matrix made the DWSR/OMMT composite exhibit high salinity resistance and low hydrophilic resin migration features. With an increase of PU content, the crosslinking density of DWSR increases gradually. When the semi-HEMA@PU content was 10 phr, the tensile strength reached a maximum of 13.6 MPa. The influences of OMMT content on swelling behavior were investigated. When the mass content for OMMT was about 1phr, the delayed expansion time was more than 50 h. The presence of OMMT significantly improved the delayed expansion property of DWSR.

中文翻译：

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吸水膨胀橡胶/OMMT复合材料的延迟膨胀行为和力学性能

摘要 为满足我国塔河油田某裂缝型裂缝型岩石储层高温、高盐度、地下 4 000 m 以上的严苛堵水条件，研制了一种新型延迟膨胀水溶胀橡胶/OMMT（DWSR）开发了耐粉质和低亲水性树脂迁移行为。HNBR、半 HEMA@PU、聚丙烯酰胺 (PAM)、OMMT 和其他橡胶添加剂在开炼机混合机中进行机械混合。通过NCO基团（50%摩尔分数）与甲基丙烯酸羟乙酯反应制备双键和异氰酸酯基团封闭的半HEMA@PU。半 HEMA@PU 分别与 PAM 的氨基和 HNBR 的不饱和双键反应。PU之间构建的交联网络，PAM 和 HNBR 基体使 DWSR/OMMT 复合材料具有高耐盐性和低亲水性树脂迁移特性。随着PU含量的增加，DWSR的交联密度逐渐增加。当半 HEMA@PU 含量为 10 phr 时，拉伸强度最大达到 13.6 MPa。研究了OMMT含量对溶胀行为的影响。当OMMT的质量含量约为1phr时，延迟膨胀时间超过50小时。OMMT 的存在显着改善了 DWSR 的延迟膨胀特性。当OMMT的质量含量约为1phr时，延迟膨胀时间超过50小时。OMMT 的存在显着改善了 DWSR 的延迟膨胀特性。当OMMT的质量含量约为1phr时，延迟膨胀时间超过50小时。OMMT 的存在显着改善了 DWSR 的延迟膨胀特性。