共聚物阻垢剂MA/AM/HPA的性能

Performance of Polymeric Scale Inhibitor MA/AM/HPA

采用水溶液自由基聚合法,以过硫酸铵为引发剂,马来酸酐(MA)、丙烯酰胺(AM)和丙烯酸羟丙酯(HPA)为单体合成了MA/AM/HPA共聚物阻垢剂。评价了MA/AM/HPA对硫酸钙、碳酸钙、硫酸钡和硫酸锶的阻垢性能。当聚合物阻垢剂的加量为一定值时,其对前述垢的阻垢率可达95%以上。考察了温度、Na Cl含量、p H值和恒温时间对聚合物阻碳酸钙和硫酸钡垢性能的影响。结果表明,MA/AM/HPA在p H=7数9范围内对碳酸钙和硫酸钡的阻垢性能较好;在90℃下,需要增加剂量以抑制碳酸钙的形成,而对硫酸钡则不需要;阻垢剂在较高氯化钠浓度环境中对碳酸钙和硫酸钡的阻垢率大于90%;MA/AM/HPA在较长的恒温时间(12数72 h)内对碳酸钙有较高的阻垢率,而对硫酸钡的阻垢率则随着恒温时间的延长明显降低。用扫描电镜(SEM)和X射线衍射(XRD)研究了MA/AM/HPA对硫酸钡、硫酸锶垢晶体的影响,发现MA/AM/HPA对垢物晶体具有晶格畸变作用。另外,室内评价了MA/AM/HPA在实际油田水中的阻垢性能。

The polymeric scale inhibitor MA/AM/HPA was synthesized by aqueous radical polymerization with ammonium persulfate as initiator,maleic anhydride（MA）,acrylamide（AM）and hydroxypropyl acrylate（HPA）as monomers. The scale inhibition efficiency of the copolymer on calcium sulfate,calcium carbonate,barium sulfate and strontium sulfate was evaluated.MA/AM/HPA possessed a good performance up to inhibition efficiency of 95% at an assure dosage for the mentioned scale types.The impact factors including temperature,Na Cl concentration,p H value and evaluation time influenced the performance of polymeric inhibitor had been studied. The results showed that MA/AM/HPA possessed good inhibition performance on calcium carbonate and barium sulfate when the p H value was from 7 to 9. At 90 oC,it was need to increase the dosage of polymer in order to inhibit the formation of calcium carbonate,while it was not required to that of barium sulfate. The inhibition rate of the inhibitor on calcium carbonate and barium sulfate in high concentration of sodium chloride environment was more than 90%. The inhibition rate of MA/AM/HPA on calcium carbonate kept well in long constant thermostatic time（12—72 h）,and that on barium sulfate decreased obviously. SEM and XRD analyses showed that the polymeric inhibitor had a lattice distortion on the scale crystal of barium sulfate and strontium sulfate. Beyond that the inhibition performance of the polymer in oilfield water was evaluated.