瓦斯排放井的套管具有直径大、重量大，在下入井筒过程中，经常出现套管被挤毁的现象。
Casings used in gas drainage Wells have large diameter and heavy weight, during the lowering process, compressive collapsing is an ordinary phenomenon.
瓦斯排放井的套管具有直径大、重量大，在下入井筒过程中，经常出现套管被挤毁的现象。
Casings used in gas drainage Wells have large diameter and heavy weight, during the lowering process, compressive collapsing is an ordinary phenomenon.
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