通过结构分析和工艺分析，在大量工艺试验的基础上，选用高溃散性树脂砂制作型芯，并成功地研制出大型薄壁复杂结构的封闭型腔铸件。
The resin sand with high collapsibility is chosen to make the core of the near closed hollow ring on the basis of many technological experimentations through analysis of structure and process.
疏松砂岩气藏由于埋藏较浅、岩石胶结性差，并且粘土和杂基含量高，使得这类气藏在开采过程中容易出砂。
Unconsolidated sand reservoir always be buried not deep, because of it's low cementation and high content of clay and sundry, the unconsolidated rock is easy to sanding during exploitation.
虽然气举系统受出砂等影响较小，但经济性分析显示，相比esp系统，气举的产量和盈利能力均较低。
Though the gas lift system was relatively unaffected by factors such as solids production, an economic analysis determined that gas lift was less productive and profitable than an ESP system.
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