Synthesis and Performance of High Temperature Filter Loss Reducer ZFA-1 for Oil Well Cement Slurries
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摘要: 针对水溶性聚合物在强碱下耐高温性能的局限性，笔者突破传统水溶性共聚物的研究思路，设计并合成了无机非金属材料-有机聚合物高温降失水剂ZFA-1。通过实验确定了ZFA-1的最佳合成工艺：AM：IA：AMPS物质的量比为6.0：2.5：1.5，分子量调节剂加量为0.005%，偶联剂加量为0.5%，无机材料加量为5%，引发剂加量为0.5%，单体质量分数为25%，体系pH值为6，引发温度为55℃，反应时间为6 h；分别采用红外光谱（FT-IR）、热重分析（DSC/DTG）对ZFA-1进行了表征。结果表明，ZFA-1为预期结构的产物，在326℃时失重率仅为7.81%，主要是由于偶联剂和无机材料的引入增加了其在高温下的稳定性。对ZFA-1的性能评价结果表明，当ZFA-1加量为1.0%~1.5%时，可将水泥浆在93~200℃、6.9 MPa时的失水量控制在50 mL以内，具有优良的抗盐性能，且对水泥石的抗压强度无不良影响。Abstract: Water-soluble polymers have limited temperature resistance in high pH environment. To improve the high temperature performance of filter loss reducers, a new high temperature filter loss reducer, ZFA-1, was developed using a quite different way of synthesis than conventional way of synthesizing water-soluble copolymers. ZFA-1 is an inorganic non-metallic material compounded with organic polymer. The optimum synthesis conditions was determined as follow through experiment:molar ratio of AM:IA:AMPS=6.0:2.5:1.5, the concentration of molecular weight modifier=0.005%, concentration of coupling agent=0.5%, concentration of inorganic material=5%, concentration of initiator=0.5%, mass fraction of monomers=25%, pH of the reaction system=6, initiation temperature=55℃, and the reaction time=6 h. Characterization of the synthesis product with FT-IR and DSC/DTG showed that the product obtained had the molecular structure as expected. The ratio of weight loss of ZFA-1 at 326℃ was only 7.81%, which can be credited to the introduction of coupling agent and inorganic material that improve the high temperature stability of the final product ZFA-1. Laboratory evaluation of ZFA-1 showed that at concentrations of 1.0% -1.5%, the filtration rate of cement slurries can be controlled within 50 mL at 93-200℃ and 6.9 MPa. ZFA-1 has excellent salt-resistance and no negative effect on the compressive strength of set cement.
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