耐高温油井水泥降失水剂的合成和性能

针对目前的AMPS共聚物固井降失水剂存在对水泥浆稠化时间影响大、耐高温能力差等问题,选择了具有特殊官能团的单体,以AMPS、N,N-二甲基丙烯酰胺(DMAA)、3-烯丙氧基-2-羟基-1-丙磺酸(AHPS)和AA为原料,合成了新型油井水泥降失水剂SCF,并通过红外光谱和热失重分析对共聚物的结构及耐热性能进行了表征。评价了添加降失水剂SCF的水泥浆综合性能。结果表明,加有3%~6%SCF的水泥浆API失水量可以控制在50 m L以下,抗温可达180℃;使水泥浆的稠化时间稍有延长,在100℃、加量为6%时,延长52 min,抗压强度略有降低,抗析水能力增强;其抗盐能力可达到36%。分析结果表明,该降失水剂靠改变滤饼的电性质和增加水泥浆体相黏度来实现对失水的控制。得出,该降失水剂合成工艺简单,综合性能良好,具有良好的应用前景。

Synthesis and Performance of a High Temperature Filter Loss Reducer for Oil Well Cementing

A filter loss reducer for use in oil well cement slurries was synthesized with(AMPS), N, N-Dimethylacrylamide(DMAA), 3-Allyloxy-2-hydroxy-1-propanesulfonic acid(AHPS) and acryl acid(AA).Molecular structure and thermal stability of the copolymer were characterized using IR and TG.Laboratory evaluation of the copolymer showed that API filter loss of a cement slurry(3%-6%) can be reduced to less than 50 mL.The copolymer functioned well at 180℃ or under contamination of the cement slurry by 36% of salt.Laboratory evaluation shows that the filter loss reducer control filter loss by changing electrical porperties of filter cake and increasing viscosity of cement slurry.Thickening time of the cement slurry was also slightly prolonged.