【摘要】 水力压裂工艺过程中 ,裂缝中压力梯度的变化会造成支撑剂回流现象 ,这势必对地面流程造成严重的冲蚀破坏。文章在了解多种地面流程防护措施的基础上 ,采用水力学的方法进行了研究 ,提出在节流油嘴上游高压低速区重力沉砂的方法。此外 ,还介绍了一种有效分离固体颗粒的装置———砂粒捕集器的设计思路和原理。装置模型实验结果表明 ,此种方法能除去天然气以及携砂液中的支撑剂 ,实现对地面流程的有效防护。更多还原

【Abstract】 In the process of hydrofracturing,the change of pressure gradient in fractures will cause the fracturing proppant backflow,by which the surface flow process may be seriously damaged because of washout.On the basis of understanding many kinds of surface flow process protection measures,a method of gravitational sand settling at the high pressure low speed section of choke upstream is put forward in the paper through studying by use of hydraulic method.In addition,the design thought and principle of sand grain catcher (a device for separating solids effectively) are introduced also.The analogue experimental results of the device show that the proppants in both natural gas and sand carried fluids can be removed by applying such a method,thus protecting the surface flow process efficiently.更多还原