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Experimental study on the influence of coal powders on the performance of water-based polymer drilling fluid

机译：煤粉对水基聚合物钻井液性能影响的实验研究

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Coal powders, as cuttings, invade the drilling fluid along a coal seam during coalbed methane development, thereby changing the properties of the drilling fluid. Therefore, this work aims to investigate the influence of coal powders on drilling fluid performance. The powders of lignite, anthracite, and contrasting shale were added to a water-based polymer drilling fluid. Then, the rheology, filtration, lubricity, and adhesiveness were measured, and the natural degradation, as well as the wettability were further evaluated. The results show that some parameters of the drilling fluid, including viscosity, lubrication coefficient, adhesion coefficient, contact angle, and surface tension, increase after adding coal powders, while other parameters, such as filtration loss and natural degradation, decrease. Compared with lignite and shale, anthracite powders, with the lowest mineral content, exhibit the smallest change in the rheological property, lubricity, adhesion, and natural degradation of the drilling fluid. Moreover, the content and size of the coal powders generally have opposing effects on the drilling fluid. When the coal powder content reaches 3 wt.%, the surface tension and contact angle of the drilling fluid show more evident changes than other parameters. Based on the analysis of the stress intensity factor, the drilling fluid with coal powders exceeding 100 mesh can reduce the capillary force in microfractures, and in combination with other factors (such as reduced filtration loss and sealing and supporting of the microfractures), improves wellbore stability. Therefore, coal powders with suitable particle sizes and concentration levels are expected to become a new drilling fluid material to protect coal field reservoirs.
机译：煤粉作为切割，在煤层气开发期间沿煤层沿煤层侵入钻孔，从而改变了钻井液的性质。因此，这项工作旨在探讨煤粉对钻井液性能的影响。将褐煤，无烟煤和对比物的粉末添加到水基聚合物钻井液中。然后，进一步评估了测量流变学，过滤，润滑性和粘合性，以及自然降解以及润湿性。结果表明，钻孔流体的一些参数，包括粘度，润滑系数，粘附系数，接触角和表面张力，加入煤粉后增加，而其他参数，如过滤损失和自然降解，降低。与褐煤和页岩相比，矿物质含量最低的无烟煤粉末，表现出钻井液的流变性，润滑性，粘附性和自然降解的最小变化。此外，煤粉的含量和尺寸通常对钻井液具有相反的作用。当煤粉含量达到3重量％时，钻井液的表面张力和接触角显示比其他参数更明显的变化。基于对应力强度因数的分析，煤粉超过100目的钻井液可以减少微磨术中的毛细管力，并与其他因素组合（例如降低过滤损失和密封和微磨料的支撑），改善了井筒稳定。因此，预期具有合适粒度和浓度水平的煤粉是保护煤田储层的新钻井液材料。

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