微交联AMPS共聚物油井水泥防气窜剂的室内研究

Study on Slight Crosslinking AMPS Copolymer as Gas Channeling Agent in Well Cementing

以AMPS、AM、N,N＇-二甲基丙烯酰胺（NNDMA）为主要共聚单体、N,N＇-亚甲基双丙烯酰胺为交联剂,合成了具有微交联结构的AMPS多元共聚物防气窜剂,分别利用红外光谱和热失重分析仪对其进行了结构和热稳定性表征,对共聚物在水泥浆中的性能进行了综合评价.实验结果表明,该共聚物具有良好的滤失控制性能,加量为0.5％时就可以把失水量控制在50 mL左右;该共聚物有较明显的增黏和提切作用,配制的水泥浆具有一定的触变性能,稠化实验及静胶凝强度实验过渡时间短,可控制在10～ 20 min之内,防气窜性能较好,在2.1 MPa的验窜压差下不发生气窜.

A slight crosslinking copolymer gas channeling agent is synthesized with AMPS, AM and N, N'-dimethylacrylamide as the main monomers and N, N'-methylene-bisacrylamide as the crosslinking agent. The gas channeling agent is characterized with IR spectroscopy and Thermogravimetricanalyzer, and its performance in cement slurry is studied. The study shows that this copolymer gas channeling agent has good filtration control capacity; filtration of about 50 mL is obtained at a copolymer concentration of only 0.5%. The copolymer has the ability to thicken cement slurry and cement slurry treated with the copolymer has a thixotropic property. Cementing slurry treated with the copolymer has short thickening time and gel strength testing time, which can be controlled within 10-20 min, and has good gas channeling control performance. No gas channeling is found in laboratory test under 2.1 MPa.