新型固井降失水剂 HTF-210C 的研发及性能评价
Preparation and Performance of New Fluid Loss Additive HTF-210C for Oil Well Cementing

题，通过引入一种偏硅酸盐，研制了高温降失水剂 HTF-210C．经红外分析表明，偏硅酸盐是以共混的形 式存在于降失水剂中；经热重分析表明该降失水剂具有良好的耐热性能，耐热温度可达 300,℃；经水泥浆性能评价 表明，该降失水剂控滤失性能好，抗盐达饱和，与其他外加剂配伍性好，低温强度发展快，稠化曲线无“鼓包”、 “包芯”现象，且重复性好，稳定性高．
additives and declining the growth of cement strength or even over retarding at low temperature，a new type of high temperature fluid loss additive，called HTF-210C，was developed by introducing metasilicate. The in- frared spectrograms were conducted to verify the coordination of metasilicate with copolymer. The result indicates that metasilicate is not involved in the polymerization reaction. Through TG analysis，the HTF-210C performs high tem- perature resistance and its chemical structure is stable below 300,℃. The evaluation results show that the HTF-210C has excellent fluid loss control ability，salt tolerant ability，good compatibility with other additives and rapid devel- opment of compressive strength at low temperature. The phenomena of “false set” or “abnormal gel” did not appear in the thickening experiments of the cement slurry containing the HTF-210C under high temperature and high pressure. HTF-210C also has high stability and good reproducibility