两性聚合物降滤失剂的合成及性能评价

Synthesis and Performance Evaluation of Amphoteric Polymer Filtration Reducer

摘要: 以丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、烯丙基聚乙二醇(APEG-500)、丙烯酰氧乙基三甲基氯化铵(DAC)为单体，利用溶液聚合法制备了一种钻井液用两性聚合物降滤失剂。对降滤失剂进行了红外光谱表征，探讨了单体质量配比对钻井液降滤失性能的影响，评价了降滤失剂在淡水基浆、饱和盐水基浆、复合盐水基浆中的降滤失性能。研究结果表明：单体的最佳配比为m(AM): m(AMPS): m(APEG-500): m(DAC) = 65:25:5:5，降滤失剂在淡水基浆、饱和盐水基浆、复合盐水基浆的滤失量分别为7.5、9.6、10.1 mL，最高使用温度可达200℃。

Abstract: A kind of amphoteric polymer filtration reducer for drilling fluid was prepared by using acryla-mide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), allyl polyethylene glycol (APEG-500) and acryloyloxyethyltrimethyl ammonium chloride (DAC) as starting materials with solution polymerization process. The filtration reducer was characterized by FTIR and the effect of monomer mass ratio on the filtration reduction performance of drilling fluid was discussed. In addition, the filtration reduction performance of the reducer was evaluated in freshwater, saturated brine and composite brine base fluids. The results indicate that 65:25:5:5 is the optimum monomer mass ratio of m(AM): m(AMPS): m(APEG-500): m(DAC). The filtration loss of filtration reducer is 7.5, 9.6 and 10.1 mL in freshwater drilling fluids, saturated brine drilling fluids and compound brine drilling fluids respectively. It can be used at the highest temperature of 200˚C.