水平井清砂十分困难，早期防砂是水平开采油必不可少的措施。
It is very difficult to remove sand from horizontal Wells, therefore, sand control at early production stage is extremely important.
随着平均开采深度和水平开采范围的增大，岩爆逐步地成为矿井地质灾害的主要起因。
As the depth of mining and horizontal extents increasing, rock-burst becomes the main cause of mining disaster.
针对我国多水平开采矿井的实际情况，建立了具有两级缓冲仓柔性连接运输系统可靠性的计算机模拟模型。
In view of real situations in multi level underground mines, a computer simulation model of reliability of mining haulage system with two ore bins has been established.
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