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首页> 外文会议>Abu Dhabi International Petroleum Exhibition Conference >Conformance Improvement for Ultra-High-Temperature Reservoir: A Comparative Study between Hydrostable and Conventional Preformed Particle Gel
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Conformance Improvement for Ultra-High-Temperature Reservoir: A Comparative Study between Hydrostable and Conventional Preformed Particle Gel

机译：超高温贮存器的一致性改进：脱肥与常规预制粒子凝胶的比较研究

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Conformance improvement for ultra-high-temperature (130 °C) reservoirs is challenging due to the poor thermostability of conventional preformed particle gel (CPPG). To overcome the defect of thermal degradation, a novel hydrostable PPG (HT-PPG) was developed using the high-temperature tolerant crosslinker. In this work, a comparative study between the HT-PPG and CPPG has been presented in respects of their swelling behaviors, rheology properties and thermal stabilities. Particle swelling behaviors and viscoelasticities were firstly assessed in ambient. Using the swollen particles, a long-term aging at 130 °C underwent during which the physical status was monitored through high pressure vials (HPV). Furthermore, characterizations involved Scanning Electron Microscope (SEM) and Fourier Transform- Infrared Spectroscopy (FT-IR) were performed for both virgin and aged specimen. Thereby, an observation of gel microstructures and elucidation upon bonds or functional groups were provided. In addition to aging tests, we deployed the Differential Scanning Calorimetry (DSC) to investigate the inflection temperature as another indicator of particle thermostability. Attributed to the hydrostable crosslinker, the HT-PPG withstood 130 °C for at least 90 d. It was found that the HT-PPG effectively maintained its particulate shape, whereas, the CPPG completely degraded after 3-d aging. The HT-PPG maintained 28.8% of its initial storage modulus (G′). On the contrary, the normalized elasticity (G′/G0') of CPPG was only 0.43%. The SEM morphologies illustrated HT-PPG kept its rigid microstructure even after 90-d aging, while indicated destruction within CPPG network. According to FT-IR characterization, the decomposition of pristine crosslinker, N,N′-Methylenebisacrylamide in CPPG may account for its instability. DSC measurements furtherly demonstrated the favorability of HT-PPG in which HT-PPG exhibited a higher inflection temperature of 133.1 °C, however, CPPG only had an inflection temperature of 127.7 °C. This work turned out the novel HT-PPG could withstand ultra-high-temperature (130 °C) for more than 90 d, maintaining its particulate shape and viscoelasticity. This a durable plugging agent was notably superior to the CPPG, offering a candidate material for the conformance improvement in ultra-high-temperature reservoirs.
机译：超高温（130°C）储存器的一致性改善由于常规预制粒子凝胶（CPPG）的热稳定性差，因此是挑战性的。为了克服热降解的缺陷，使用高温耐耐耐力交联剂开发一种新的可脱肥性PPG（HT-PPG）。在这项工作中，HT-PPG和CPPG之间的比较研究已经提出了它们的肿胀行为，流变性能和热稳定性。在环境中首先评估颗粒肿胀行为和粘弹性。使用溶胀的颗粒，在130℃下进行长期老化，在此期间通过高压小瓶（HPV）监测物理状态。此外，对扫描电子显微镜（SEM）和傅里叶变换红外光谱（FT-IR）进行了特征，用于处于处女和老化的样本。由此，提供了凝胶微观结构的观察并阐明键合或官能团上。除了老化测试之外，我们还部署了差分扫描量热法（DSC），以研究拐点温度作为颗粒热稳定性的另一个指标。归因于可脱肥式交联剂，HT-PPG具有130℃至少90d。发现HT-PPG有效地保持其颗粒形状，而CPPG在3-D老化后完全降解。 HT-PPG维持其初始储存模量（G'）的28.8％。相反，CPPG的归一化弹性（G'/ G0'）仅为0.43％。即使在90-D老化之后，HT-PPG也使HT-PPG保持其刚性微观结构，同时在CPPG网络内表明破坏。根据FT-IR表征，PPG中原始交联剂N，N'-亚二甲基异丙亚丙烯酰胺的分解可能是其不稳定性。 DSC测量结果进一步证明了HT-PPG的利益性，其中HT-PPG表现出较高的拐点133.1℃，然而，CPPG仅具有127.7°C的拐点。该工作原始新型HT-PPG可以承受超过90d的超高温（130°C），保持其颗粒形状和粘弹性。该耐用的堵塞剂尤其优于CPPG，为超高温储层的一致性改进提供候选材料。

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