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High temperature and high pressure rheological properties of high-density water-based drilling fluids for deep wells

机译：深井高密度水基钻井液的高温高压流变特性

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To maintain tight control over rheological properties of high-density water-based drilling fluids, it is essential to understand the factors influencing the rheology of water-based drilling fluids. This paper examines temperature effects on the rheological properties of two types of high-density water-based drilling fluids (fresh water-based and brine-based) under high temperature and high pressure (HTHP) with a Farm 50SL rheometer. On the basis of the water-based drilling fluid systems formulated in laboratory, this paper mainly describes the influences of different types and concentration of clay, the content of a colloid stabilizer named GHJ-1 and fluid density on the rheological parameters such as viscosity and shear stress. In addition, the effects of aging temperature and aging time of the drilling fluid on these parameters were also examined. Clay content and proportions for different densities of brine-based fluids were recommended to effectively regulate the rheological properties. Four rheological models, the Bingham, power law, Casson and H-B models, were employed to fit the rheological parameters. It turns out that the H-B model was the best one to describe the rheological properties of the high-density drilling fluid under HTHP conditions and power law model produced the worst fit. In addition, a new mathematical model that describes the apparent viscosity as a function of temperature and pressure was established and has been applied on site.
机译：为了保持对高密度水基钻井液流变性的严格控制，必须了解影响水基钻井液流变性的因素。本文使用Farm 50SL流变仪研究温度对高温高压下两种类型的高密度水基钻井液（新鲜水基和盐水基）的流变性的影响。本文在实验室配制的水基钻井液体系的基础上，主要描述了黏土种类和浓度，胶体稳定剂GHJ-1的含量以及流体密度等对流变学参数如粘度和粘度的影响。剪应力。此外，还检查了钻井液的时效温度和时效时间对这些参数的影响。建议使用不同密度的盐水基粘土的粘土含量和比例，以有效调节流变性能。四种流变模型，Bingham模型，幂律模型，Casson模型和H-B模型，都用于拟合流变参数。结果表明，H-B模型是描述HTHP条件下高密度钻井液流变特性的最佳模型，幂律模型的拟合效果最差。此外，建立了描述表观粘度随温度和压力变化的新数学模型，并已在现场应用。

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