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Micro-manganese as a weight agent for improving the suspension capability of drilling fluid and the study of its mechanism

机译：微锰作为一种重量试剂，用于改善钻井液的悬浮能力及其机制的研究

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The contradiction between the sag stability of weighted materials and the rheological properties of drilling fluids is one of the main technical difficulties in high-density drilling fluids. Thus, understanding the suspension mechanism of weighting materials is the key to improving the sag stability of weighting materials. In this study, micro-manganese (Mn3O4) was compared with the commonly used weighting agent barite to study the suspension mechanism of Mn3O4. The weighting effect of Mn3O4 and barite was evaluated by static and dynamic sag tests, rheological property measurements and filtration property tests. The evaluation experiment results showed that the sag stability of Mn3O4 was better than that of barite, and Mn3O4 could significantly increase the suspension capacity of drilling fluids and improve their rheology property. The scanning electron microscopy (SEM) and other test results indicate that the small and uniform spherical structure of micro-manganese not only causes it to have less friction, but also intense Brownian motion in drilling fluid, which weakens the sag caused by gravity. The large specific surface area of Mn3O4 results in the strong adsorption of water molecules and polymers in drilling fluids, resulting in the formation of a hydrated film on the surface of the Mn3O4 particles and physical crosslinking with polymer chains. This prevents sagging caused by the adsorption of small particles to form large particles. The key findings of this work are expected to provide a basis for improving the sag stability of weighting materials in drilling fluids and better the application of micro-manganese in drilling fluids.
机译：加权材料的下垂稳定性与钻井液流变性质之间的矛盾是高密度钻井液中的主要技术困难之一。因此，了解加权材料的悬架机制是提高加权材料稳定性的关键。在该研究中，将微锰（MN3O4）与常用的加权剂重晶体进行比较，以研究Mn3O4的悬浮机制。通过静态和动态下垂试验，流变性能测量和过滤性能测试评估Mn3O4和重晶石的加权效果。评价实验结果表明，MN3O4的下垂稳定性优于重晶石的稳定性，MN3O4可显着提高钻井液的悬浮能力，提高其流变性。扫描电子显微镜（SEM）和其他测试结果表明，微锰的小而均匀的球形结构不仅使其具有较少的摩擦，而且在钻井液中也具有强烈的布朗运动，这削弱了引起的重力引起的凹陷。 MN3O4的大的比表面积导致钻井液中的水分子和聚合物的强烈吸附，导致Mn3O4颗粒表面上的水合膜形成，与聚合物链的物理交联。这可以防止由小颗粒的吸附形成大颗粒引起的下垂。预计这项工作的关键结果将为提高钻井液中加权材料的下垂稳定性以及更好地应用微锰在钻井液中的应用提供依据。

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    《RSC Advances》 |2019年第61期|共15页
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  • 正文语种 eng
  • 中图分类 化学;
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