Abstract
To meet the technical requirements of high-temperature drilling engineering, a highly inhibitive, high-temperature-resistant shale inhibitor for water-based drilling fluids (WBDFs) is crucial. This paper reports a new type of small molecule organosilicate polymer (ADMOS) was synthesized through emulsion polymerization. Its inhibitive properties were evaluated using the linear swell test and cutting dispersion test, The results were compared to those for other conventional inhibitors. The results show that ADMOS forms a hydrophobic polymer membrane through chemical and physical synergistic adsorption, which effectively increases the inhibition of clay hydration expansion and dispersion. Its performance is better than that of other common inhibitors. The chemical adsorption of Si-O-Si bonds between ADMOS and clay particles was confirmed for the first time through the 29Si NMR experiment. Further, the introduction of siloxane groups in the ADMOS molecular chain effectively strengthens the adsorption stability of polymer inhibitors in high-temperature environments (150 °C) and has potential application in high-temperature deep wells.
Published Version
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