Preparation and High-Temperature Stabilization Mechanism of Quaternary Copolymer Suspension Stabilizer for Cementing Spacer Fluid

IF 3.1 3区化学 Q2 POLYMER SCIENCE

Journal of Applied Polymer Science Pub Date : 2026-10-01 Epub Date: 2026-08-27 DOI:10.1002/app.71401

Fuyun Wang, Quan Cao, Yao Wang, Simeng Liu, Jun Zhao, Zhifan Yang, Shuran Duan, Ming Li

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引用次数: 0

Abstract

Conventional spacer fluids fail at high temperatures in deep wells, causing sedimentation and poor cementing quality. In this study, a quaternary copolymer suspension stabilizer was synthesized via aqueous free-radical polymerization. Orthogonal tests revealed that the influence of synthesis parameters on sedimentation stability followed the order: pH > reaction temperature > initiator dosage > monomer molar ratio. The optimal conditions were determined as a monomer molar ratio of 1:1.5:0.5:0.2, a reaction temperature of 65°C, an initiator dosage of 0.1 mol%, and a pH of 5.5. The structure was verified by Fourier-transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectroscopy (¹H-NMR). Performance evaluation shows that the stabilizer enables the spacer fluid to maintain excellent sedimentation stability at 200°C. It presents good rheological and thickening compatibility with drilling fluid and cement slurry. Mechanism analysis indicates that the stabilizer provides high-temperature stability through chemical adsorption and steric hindrance. Viscosity measurements conducted at a shear rate of 170 s⁻¹ over a temperature range of 30°C ~200°C show that the polymer solution retains 45% of its initial viscosity at 200°C, indicating that the main chain remains intact and meets the demands of deep and ultra-deep well cementing.

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固井隔离液四系共聚物悬浮稳定剂的制备及其高温稳定机理

传统的隔离液在深井高温下失效，导致沉积和固井质量差。本研究采用水相自由基聚合法制备了一种季系共聚物悬浮剂。正交试验表明，合成参数对沉淀稳定性的影响顺序为：pH >；反应温度>；引发剂用量>；单体摩尔比。最佳反应条件为单体摩尔比1:1.5:0.5:0.2，反应温度65℃，引发剂用量0.1 mol%, pH 5.5。并用傅里叶变换红外光谱（FTIR）和质子核磁共振光谱（1H-NMR）对其结构进行了验证。性能评估表明，稳定剂可使隔离液在200°C下保持优异的沉降稳定性。与钻井液和水泥浆具有良好的流变和增稠相容性。机理分析表明，该稳定剂通过化学吸附和位阻作用实现高温稳定。在剪切速率为170 s−1、温度范围为30°C ~200°C的情况下进行的粘度测量表明，聚合物溶液在200°C时仍保持了初始粘度的45%，这表明主链保持完整，满足深井和超深井固井的要求。

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来源期刊

Journal of Applied Polymer Science 化学-高分子科学

CiteScore

5.70

自引率

10.00%

发文量

1280

审稿时长

2.7 months

期刊介绍： The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.