四元共聚钻井液降滤失剂的合成与性能评价

Synthesis and Performance Evaluation of an Quardripolymer

摘要:

采用丙烯酰胺(AM)、烯丙基磺酸钠 (SAS)、对苯乙烯磺酸钠(SSS)与烯丙醇聚氧乙烯醚(APEG)制备了一种抗温耐盐AM-SAS-SSS-APEG四元共聚物用于钻井液降滤失剂。通过单因素法考察了单体配比、单体浓度、引发剂用量、反应温度、反应时间等对合成降滤失剂性能的影响，确定了最佳合成条件为：单体配比(质量比)：m(AM):m(APEG):m(SSS):m(SAS)= 6.5:2.0:0.5:1.0，单体浓度为20%，引发剂用量为0.2%，反应温度60℃。对该聚合物进行了红外表征(FTIR)确证了该降滤失剂的结构；热重分析(TGA)表明该聚合物具有较好的热稳定性；对不同条件下泥浆形成的滤饼进行了电镜扫描(SEM)，对比滤饼形貌发现，加入降滤失剂后可形成薄而致密的泥饼。抗温耐盐实验结果表明，所合成的聚合物抗温能力较好（190℃），在盐水及复合盐水钻井液中均具有较好的降失水能力。

Abstract:

A novel copolymer was synthesized using acrylamide(AM),sodium allylsulfonate (SAS),sodium p-Styrene sulfonate (SSS) and Acrylic polyethers(APEG), it could be used as an anti-temperatureand and salt-tolerant fluid loss additive. We obtained the optimal reaction conditions, which is, m(AM):m(APEG):m(SSS):m(SAS)= 6.5:2.0:0.5:1.0, monomer concentration is 20%, dosage of initiator is 0.2%, temperature of reaction is 60℃. Meanwile, the structure of this polymer was confirmed through FTIR, the result show that the molecular sturcture of the artificial synthesis product is in accord with the ideal one. The thermogravimetric experiment indicates good therm stability of this polymer. Compared the morphology of filter cake by SEM, it could forn a thin and dense filter cake by the fluid loss agent .Moreover, the fluid loss additive had reveal good temperature resistance and salt tolerance.