During overlying rock strata being fractured, the surface gas drainage boreholes may be damaged due to ground movement.

在长壁工作面通过的过程中，地面垂直钻孔可能随岩层移动而发生破坏。

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Test results of surface gas extraction technology from boreholes in the goaf in Zhangbei Coal Mine, Huainan Mining Group are introduced in the paper.

本文介绍了淮南矿区张北矿地面钻孔抽采采空区瓦斯技术的试验成果。

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This paper elucidated the theoretical basis for controlling the fluidization parameters by calculating the SGV surface gas velocity in he LLDPE reactor.

通过对LLDPE聚合反应器表观气速(sgv)值的计算，为流化参数的控制提供了理论依据。

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"There is some near-surface gas hydrate, " she said Wednesday.

CNN: Study: Tap natural gas from Alaska's frozen areas

Occurrences of flammable tap water, if not the result of existing gas transport pipelines, can be explained by totally unrelated gas leaks that occasionally occur around coal beds, which are far closer to the surface than natural gas deposits.

FORBES: Slurring Natural Gas With Flaming Faucets And Other Propaganda

The gel purportedly turns to vapor underground, then returns to the surface with the gas.

FORBES: Can No-Water Fracking Quiet Critics?