The Preparation and Performance Characterization of a Cement Suspending Agent Resistant to 200 ℃
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摘要: 针对深井、超深井固井中，水泥浆在高温下液相黏滞力下降而发生固相沉降失稳甚至分层的问题，设计合成了一种耐200 ℃的高温悬浮剂GX，该剂是以丙烯酰胺（AM）、对苯乙烯磺酸钠（SSS）、N, N-二乙基丙烯酰胺（DEAA）为单体，过硫酸铵（APS）为引发剂，采用自由基溶液聚合法制得的三元共聚物。采用GPC、FTIR、1H-NMR和SEM对高温悬浮剂的分子量、结构和形貌进行了表征，结果表明，3种单体均参与聚合反应，成功合成了AM/SSS/DEAA三元共聚物。TG、FTIR和SEM分析表明，高温悬浮剂的耐热性能优异，最高可达318.6 ℃。高温沉降稳定性评价结果表明，高温悬浮剂的适用温度可达200 ℃，水泥浆中加入悬浮剂GX后，200 ℃下密度差小于0.02 g/cm3，能提高水泥浆的沉降稳定性，且高温悬浮剂的加入对水泥浆的流变性、稠化时间和水泥石的强度无负面影响。Abstract: In deep and ultra-deep well cementing, the viscous force of the liquid phase of a cement slurry decreases at elevated temperatures, resulting in settling of solid phase and even lamination of the cement slurry. To solve these problems, a high temperature suspending agent GX was developed through radical solution polymerization with acrylamide (AM), sodium p-styrene sulphonate (SSS), N,N-diethylacrylamide (DEAA) as the monomers and ammonium persulphate (APS) as the initiator. GX is a terpolymer resistant to 200 ℃. Characterization of the molecular weight, molecular structure and morphology of GX with GPC, FTIR, 1H-NMR and SEM have shown that the three monomers all take part in the polymerization reaction to produce the AM/SSS/DEAA terpolymer. TG, FTIR and SEM analyses have shown that the high temperature suspending agent GX has excellent thermal stability, it is resistant to 318.6 ℃. High temperature settling stability evaluation has shown that GX functions normally at temperatures as high as 200 ℃, a cement slurry treated with GX has density difference of less than 0.02 g/cm3 at 200 ℃. GX can be used to improve the settling stability of cement slurries, and it has no negative effects on the rheology, thickening time of the cement slurry, and on the strengths of the set cement.
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表 1 水泥浆体系沉降稳定性评价
T/℃ GX/% ρ上/（g·cm−3） ρ下/（g·cm−3） △ρ/（g·cm−3） 150 0.1 1.875 1.896 0.021 165 0.1 1.867 1.882 0.015 180 0.1 1.887 1.900 0.013 200 0.1 1.883 1.891 0.008 
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表 2 不同温度下水泥浆流变性能和流变参数拟合结果
GX/% T/℃ φ3/φ6/φ100/φ200/φ300/φ600 n K/Pa·sn R2 0 25 4/6/77/150/222/- 0.964 0.278 0.998 0.1 25 4/6/72/139/207/- 0.961 0.263 0.998 150 3/4/54/98/139/257 0.861 0.331 0.997 200 4/6/80/150/214/- 0.896 0.410 0.999
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