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Sodium hydroxymethyl lignosulfonate (NaHLS) was prepared by hydroxymethylation of sodium lignosulfonate (NaLS) with formaldehyde. NaLS and NaHLS were characterized using Fourier transform infrared (FTIR) and transmission electron microscopy. The performance of NaLS- or NaHLS-modified drilling fluid was evaluated. The results showed that both NaHLS and NaLS can be used as low-temperature thickeners, high-temperature thinners, and filtration-loss control agents. For each of the technical performance measures, NaHLS is more effective than NaLS under any condition, especially under higher temperatures (180°C). In addition, the performance of NaHLS is similar to that of ferric chomium lignin sulfonate (FCLS), which means that it can be developed as a chromium-free drilling fluid additive. A test of the influence of NaHLS on the growth of wheat seedlings showed that NaHLS solution benefits the growth even better than a commercial culture solution.
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Chen et al. (2014) studied this question.
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