新型耐温抗盐降失水剂的合成与测试

Synthesis and Test of Novel Temperature-Resistant and Salt-Tolerant Fluid Loss Additive

为了弥补国内固井降失水剂的不足,选取2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、N,N-二甲基丙烯酰胺(DMAA)、新型双羧基化合物(XX)为原料合成了共聚物型降失水剂,对其结构进行了表征,全面探讨了各种反应条件对合成降失水剂性能的影响.结果表明,在AMPS、DMAA、XX物质的量的比为70∶25∶5时,固含量为12%,反应温度为60,℃,引发剂加量为0.5%,pH值为8和反应时间为2,h的条件下合成的降失水剂效果最佳,其在200,℃时和饱和盐水水泥浆中,都可将水泥浆API失水量控制在100,mL以内,且可解决因高温水解造成的超缓凝和稠化时间倒挂问题.

To make up for the deficiency of the domestic fluid loss additive, the monomers of 2-acrylamido-2- methyl-propane sulphonic acid （AMPS）, N, N-dimethyl-acrylamide （DMAA）and new compound with double car boxyl （ XX ） were chosen to synthesize a kind of fluid loss additive belonging to copolymer. The structure of the fluid loss additive was characterized. At the same time, the influence of reaction conditions on its properties was compre hensively discussed. Results show that on the condition of the mole ratio being 70 ： 25 ： 5 for AMPS, DMAA and XX, the mass fraction of monomers being 12%, reaction temperature being 60 ℃, initiator dosage being 0.5%, reaction pH being 8 and polymerization time being 2 h, the fluid loss additive presents best performance. For one thing, the API fluid loss can be controlled below 100 mL at 200 ℃ and in saturated brine cement slurry; for another, the problem of the far delayed solidification and inverted thickening time resulting from pyrohydrolysis can be solved.