低密度固井水泥浆悬浮稳定剂的制备、表征及评价,Journal of Applied Polymer Science

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低密度固井水泥浆悬浮稳定剂的制备、表征及评价
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-08-25 , DOI: 10.1002/app.53058
Qian Feng ₁ , Fangjun Jia ₁ , Zhigang Peng ₁ , Yong Zheng ₁

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低密度水泥浆体系通常用于低压和易渗漏的固井。但由于避雷材料的加入，系统的悬浮稳定性更难控制。特别是在温差较大的情况下，密度差较大的固体颗粒之间的相对运动增加，会加剧浆体的不稳定性，影响固井质量。因此，为有效控制低密度水泥浆体系的悬浮稳定性，采用N-乙烯基己内酰胺（NVCL）自由基溶液聚合合成悬浮稳定剂PAND；2-丙烯酰胺-2-甲基丙烷磺酸 (AMPS), N, N-二甲基丙烯酰胺（DMAA）作为单体。评价了大温差（40～120℃）下PAND对低密度水泥浆稳定性的影响。结果表明，在40～120℃下，加入0.8%PAND可将水泥浆水分离控制在0；养护后水泥石柱上下密度差小于0.01g/cm ³. 水泥石的力学性能得到改善，说明其对低密度水泥浆体系具有良好的悬浮稳定效果。紫外光谱和扫描电镜分析表明，PAND随着温度的升高形成分子间疏水缔合网络结构，可以保持溶液体系的粘度，从而起到影响悬浮稳定性的作用。

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Preparation, characterization, and evaluation of suspension stabilizer for low-density cement slurry for cementing

A low-density cement slurry system is commonly used in low-pressure and leakage-prone cementing. However, the suspension stability of the system is more difficult to control because of the addition of lightning material. Especially under the condition of large temperature differences, the relative motion between solid particles with large density differences increases, which will aggravate the instability of the slurry and affect the cementing quality. Therefore, to effectively control the suspension stability of the low-density cementing slurry system, the suspension stabilizer PAND was synthesized by free radical solution polymerization with N-vinyl caprolactam (NVCL); 2-acrylamide-2-methyl propane sulfonic acid (AMPS), N, N-dimethyl acrylamide (DMAA) as monomers. The effect of PAND on the stability of low-density cement slurry under a large temperature difference (40 ~ 120°C) was evaluated. The results showed that under 40 ~ 120°C, adding 0.8% PAND can control the water separation of the cement slurry to 0; the density difference between the upper and lower parts of the cement stone column after curing is less than 0.01 g/cm³. The mechanical properties of cement stone are improved, which shows that it has a good suspension stability effect on low-density cement slurry systems. The analysis of UV spectroscopy and scanning electron microscopy showed that PAND formed an intermolecular hydrophobic association network structure with the increase in temperature, which could maintain the viscosity of the solution system, thus playing an influential suspension stability role.

更新日期：2022-08-25

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