PAMAM树枝状聚合物抑制泥页岩水化膨胀和分散特性

发布时间：2018-12-08 16:55

【摘要】：针对泥页岩水化特征,结合树枝状聚合物独特的结构与性能,将树枝状聚合物聚酰胺胺PAMAM作为泥页岩稳定剂,通过页岩滚动分散实验、粒度分布测试、屈曲硬度实验评价不同代数(G0~G5)PAMAM的抑制性。采用傅里叶红外光谱(FT-IR)、X线衍射(XRD)和透射电镜(TEM)等分析不同代数PAMAM与黏土的作用,并揭示其微观作用机理。分别以G0和G5为泥页岩水化膨胀抑制剂和水化分散抑制剂,构建新型水基钻井液体系。研究结果表明:树枝状聚合物聚酰胺胺能有效抑制泥页岩水化膨胀和分散,G0和G5抑制性优于传统的KCl和聚醚胺类抑制剂,适当降低介质p H可提高其抑制性。不同代数的PAMAM在黏土表面的吸附排列方式不同,G0为单层吸附;G1,G2和G3在黏土层间的吸附与浓度有关,随着浓度的升高分子排列由单层向双层转变;G4和G5相对分子质量较大,由于空间位阻效应不能进入黏土晶层间,主要吸附在黏土颗粒的外表面。G0能抑制黏土晶层内表面的水化膨胀,G5能阻止黏土颗粒的水化分散,将两者配合起来可达到协同稳定泥页岩的效果。该钻井液体系抑制性突出,接近油基钻井液。
[Abstract]:According to the hydration characteristics of shale, combined with the unique structure and properties of dendritic polymers, the dendritic polymer polyamide amine (PAMAM) was used as shale stabilizer, and the particle size distribution was measured through shale rolling dispersion experiment. Buckling hardness experiments were used to evaluate the inhibition of PAMAM in different algebras (G0~G5). Fourier transform infrared spectroscopy (FT-IR), X line diffraction (XRD) and transmission electron microscope (TEM) were used to analyze the interaction between different algebraic PAMAM and clay and to reveal the microcosmic mechanism of the interaction. A new water-based drilling fluid system was constructed with G _ 0 and G _ 5 as shale hydration expansion inhibitor and hydration dispersion inhibitor respectively. The results show that the dendritic polymer polyamide amine can effectively inhibit the hydration expansion and dispersion of shale. The inhibition of G _ 0 and G _ 5 is better than that of traditional KCl and polyether amine inhibitors. The adsorption patterns of PAMAM on clay surface are different, G _ 0 is monolayer adsorption, the adsorption of G _ 1G _ 2 and G _ 3 between clay layers is related to the concentration, and the polymer arrangement changes from monolayer to double-layer with increasing concentration. The relative molecular mass of G4 and G5 is relatively large. Due to steric resistance effect, it is mainly adsorbed on the outer surface of clay particles. G0 can inhibit the hydration expansion of the inner surface of clay crystal layer, and G5 can prevent the hydration and dispersion of clay particles. The synergistic stabilization of shale can be achieved by the combination of the two. This drilling fluid system has prominent inhibition and is close to oil-based drilling fluid.
【作者单位】：中国石油大学(华东)石油工程学院;
【基金】：山东省博士后创新项目专项资金资助项目(201303060) 中国博士后基金资助项目(2014M551986) 国家自然科学基金资助项目(51474235,51474236) 中央高校基本科研业务费专项资金资助项目(16CX02023A)~~
【分类号】：TE254

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