Study on self-healing gel plugging agent based on non-covalent bonding interaction for drilling fluid,Journal of Applied Polymer Science

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Study on self-healing gel plugging agent based on non-covalent bonding interaction for drilling fluid
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-03-11 , DOI: 10.1002/app.53874
Yuanzhi Qu ₁ , Xinyu Zhou ₂ , Han Ren ₁ , YueHui Yuan ₁ , Wenchao Zhang ₃ , Gang Yang ₄ , Xianfa Zhang ₅

Affiliation

During drilling in deep formations, it is challenging to form an effective plug to avoid borehole collapse under high temperatures and pressures. In order to simultaneously improve the high-temperature resistance and interparticle interaction capability of traditional plugging agents, a new gel plugging agent (PCAA) with self-healing capability was developed using chitosan, acrylamide, and acrylic acid. The rheological properties of the PCAA indicate that all monomers of PCAA are essential components to improve the performance of the plugging agent. Each monomer has a unique capability, such as acrylamide playing a dominant role in the construction of the gel network, acrylic acid enhancing the gel structure, and chitosan improving the gel adhesion. PCAA can be stretched to 8.8 times prolonged, and its tensile stresses and self-healing rate in 16 h are 17.2 kPa and 78.5%, respectively. Under the extreme conditions of 180°C and 8% NaCl, PCAA still performs well in preventing drilling fluid from invading the sand layer due to its self-healing and plugging effects. In addition, the interaction of PCAA and clay improves the stability, rheological properties, and filtration reduction of drilling fluids at high temperatures. The developed PCAA has been successfully applied to the field with extreme conditions, providing insights into plugging agent design.

中文翻译：

基于非共价键相互作用的钻井液自修复凝胶堵剂研究

在深部钻井过程中，在高温高压下形成有效的塞子以避免井眼坍塌是一项挑战。为了同时提高传统堵剂的耐高温性和颗粒间相互作用能力，以壳聚糖、丙烯酰胺和丙烯酸为原料，开发了一种具有自修复能力的新型凝胶堵剂（PCAA）。PCAA的流变性能表明PCAA的所有单体都是提高堵剂性能的必要组分。每种单体都有独特的能力，例如丙烯酰胺在凝胶网络的构建中起主导作用，丙烯酸增强凝胶结构，壳聚糖改善凝胶粘附。PCAA可延长至8.8倍延长，其16 h的拉应力和自愈率分别为17.2 kPa和78.5%。在180°C和8% NaCl的极端条件下，PCAA由于其自愈和封堵作用，在防止钻井液侵入砂层方面仍然表现良好。此外，PCAA 与粘土的相互作用提高了钻井液在高温下的稳定性、流变性和滤失率。开发的 PCAA 已成功应用于极端条件的现场，为堵剂设计提供了见解。高温下钻井液的流变学特性和滤失率。开发的 PCAA 已成功应用于极端条件的现场，为堵剂设计提供了见解。高温下钻井液的流变学特性和滤失率。开发的 PCAA 已成功应用于极端条件的现场，为堵剂设计提供了见解。

更新日期：2023-03-11

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