高含盐量高密度钻井泥浆降粘剂的合成及其降粘性能研究

Study on the synthesis and properties of viscosity reducer in high salinity and high density drilling mud

针对深井钻探用高含盐量高密度泥浆的降粘问题,通过2-丙烯酰胺-2-甲基丙磺酸与顺丁烯二酸酐共聚制备一类降粘剂,并分别采用FT-IR、1H NMR和TG分析降粘剂的分子结构和热稳定性.探究单体浓度、单体投加比、引发剂加入量对降粘剂性能的影响,从而得出最佳的合成条件.研究降粘剂的加量对降粘效果的影响,结果表明仅加入降粘剂的降粘效果难以满足施工要求,但通过与表面改性剂RHA复配使用,200℃老化16 h后,泥浆降粘率高达36.2%,有望解决高含盐量高密度泥浆降粘的难题.

For reducing the viscosity of high salinity and high density drilling mud used in deep well,a viscosity agent was synthesized by 2-acrylamide-2-methyl propane sulfonic acid and maleic anhydride. The chemical structure and thermal stability of the viscosity reducer was analyzed by FT-IR and TG. To get the best synthesis condition, factors such as monomer concentration, monomer proportion, initiator content were studied. The effect of viscosity reducer's content in the mud was also researched. The results showed that it was hard to make the mud's rheological properties meet the requirements of the construction site when only the synthetic viscosity reducer was added. However,when the viscosity reducer was added compound with a surface modifier RHA into the mud,its viscosity-reducing rate can be still as high as 36. 2% after continuously aging at a temperature of 200 ℃ for 16 hours. This approach is expected to solve the viscosity-reducing problem of high salinity and high density drilling mud in the future.