Study of ground collapse induced by large-diameter horizontal directional drilling in a sand layer using numerical modeling
Study of ground collapse induced by large-diameter horizontal directional drilling in a sand layer using numerical modeling
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DOI：
10.1139/cgj-2014-0388
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发表时间：
2015-02
影响因子：
3.6
通讯作者：
Biao Shu;B. Ma
中科院分区：
文献类型：
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作者：
Biao Shu;B. Ma
随着大直径水平定向钻井（HDD）成为在河流下方建造石油和天然气管道以及公用事业管道的首选方法，当在松散的地质层（例如砂）中钻井时，出现了潜在的地面塌陷问题。地面塌陷是钻孔塌陷的结果，可能对地形和附近设施造成重大损害。本调查考虑了一个实际的1.219米直径的HDD跨河工程引起的地面塌陷的潜在原因，使用FLAC3D数值模拟工具。分析表明，破坏区首先在钻孔顶部发展，由于上面的沙子不稳定，导致随后的钻孔坍塌，并最终导致地面塌陷。模拟了连续扩孔循环，结果表明与单次扩孔循环相比，影响很小。井眼坍塌以及随之发生的地面坍塌的风险随着井眼直径的增加而增加。护理人员...
With large-diameter horizontal directional drilling (HDD) becoming the preferred method to construct oil and gas pipelines and utility pipelines beneath rivers, the issue of potential ground collapse arises when drilling in loose geological layers such as sand. Ground collapse is a result of borehole collapse and may cause significant damage to the topography and nearby facilities. The present investigation considered the potential causes of ground collapse induced by an actual 1.219 m diameter HDD river-crossing project, using the FLAC3D numerical modeling tool. The analysis showed that the failure zone first developed at the crown of the borehole, resulting in subsequent borehole collapse due to instability of the sand above, and eventually leading to ground collapse. Sequential reaming cycles have been simulated and the results indicate very little effect in comparison with a single reaming cycle. The risk of borehole collapse, and consequent ground collapse, increases with borehole diameter. Parametri...