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Co-modification of Bentonite by CTAB and Silane and its Performance in Oil-Based Drilling Mud

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Clays and Clay Minerals

Abstract

The stability, dispersion, and rheological properties of clay suspensions are important in the process of drilling. Organic clays were obtained traditionally by cation exchange, which is thermally unstable due to weak electrostatic interaction between the cationic surfactant and clay minerals. The purpose of the present study was to yield a stable and well dispersed organic bentonite (OBent) as a rheological additive for oil-based drilling mud. The co-modified method was used to modify bentonite by a cationic surfactant (cetyltrimethoxyammonium bromide: CTAB) and a silane coupling agent (hexadecyltrimethoxysilane: HDTMS). Firstly, the basal spacing of bentonite was enlarged by intercalation of CTAB, and the thermal stability of bentonite was improved by covalent bonds of HDTMS onto the bentonite platelets. The as-prepared OBent was characterized by infrared analysis, X-ray diffraction analysis, thermogravimetric analysis, and scanning electron microscopy. The hydrophobicity, solubility, viscosity, and tribological performance of the OBent were also recorded. The test results showed that the hydrophobicity of the co-modified bentonite was improved significantly, and was greater than that of bentonite modified with single surfactant CTAB or HDTMS. The bentonite modified by the surfactant together with the silane coupling agent had stable rheology and a lower coefficient of friction than the single surfactant-modified bentonite because more HDTMS entered into the interlayer spaces and formed chemical bonds at the inner surface of platelets.

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Acknowledgments

The authors acknowledge the financial support provided by National Natural Science Foundation of China (grant Nos. 51775168, 21671053, 51875172, 51605143, and 51605469), by the scientific and technological innovation team of Henan Province University (grant No. 19IRTSTHN024), Science and Technology Development Plan Project of Henan Province (202102210254), and Key Scientific Research Project of Colleges and Universities in Henan Province (20A150003)

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Funding sources are as stated in the Acknowledgments.

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Authors and Affiliations

  1. Engineering Research Center for Nanomaterials, Henan University, Kaifeng, 475004, Henan, China

    Miao Guo, Guangbin Yang, Shengmao Zhang, Yujuan Zhang, Chuanping Gao, Chunli Zhang & Pingyu Zhang

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  1. Miao Guo
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  2. Guangbin Yang
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  3. Shengmao Zhang
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  6. Chunli Zhang
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Correspondence to Guangbin Yang or Pingyu Zhang.

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(Received 1 May 2020; revised 23 July 2020; AE: Jun Kawamata)

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Guo, M., Yang, G., Zhang, S. et al. Co-modification of Bentonite by CTAB and Silane and its Performance in Oil-Based Drilling Mud. Clays Clay Miner. 68, 646–655 (2020). https://doi.org/10.1007/s42860-020-00093-7

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