论文部分内容阅读
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:单体质量比:m(AM)∶m(APEG)∶m(SSS)∶m(SAS)=6.5∶2.0∶0.5∶1.0,单体质量分数为20%,引发剂用量为单体总质量的0.2%,反应温度60℃。对该条件下制备的聚合物进行了红外光谱表征(FTIR);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。
A temperature-resistant salt-tolerant AM-SAS-SSS was prepared by using acrylamide (AM), sodium allylsulfonate (SAS), sodium p-styrenesulfonate (SSS) and allyl alcohol polyoxyethylene ether (APEG) -APEG tetrapolymer for drilling fluid filtrate reducer. The effects of monomer ratio, monomer concentration, initiator amount and reaction temperature on the performance of the synthetic fluid loss control (LOD) filter were investigated by single factor method. The optimum synthesis conditions were as follows: monomer mass ratio: m (AM) m (APEG): m (SSS): m (SAS) = 6.5: 2.0: 0.5:1.0, the mass fraction of monomer is 20%, the initiator dosage is 0.2% of the total mass of monomer, reaction temperature is 60 ℃. Thermogravimetric analysis (TGA) showed that the polymer had good thermal stability. The filter cake formed under different conditions was electron microscopically scanned ( SEM). Comparing the morphology of the filter cake, it can be found that a thin and dense mud cake can be formed by adding the filtrate reducer. The results of the temperature and salt tolerance test show that the synthesized polymer has good temperature resistance (190 ℃) and good water loss ability in both brine and composite brine drilling fluids.