对于严重出砂地层的油水井，即使采取了机械或者化学防砂措施，也不能保证油水井的长期稳产，不得不提出防砂管柱进行更换。
Generally, it is not enough to take mechanical or chemical sand-prevention methods for those high sand production Wells, resulting in replacing the sand-prevention tubings.
粉细砂岩油井由于埋藏浅、地层压实程度低、胶结疏松，在较大生产压差下容易出砂。
The fine siltstone reservoir is likely to produce sand under larger pressure drops because of its shallow depth, worse compaction and unconsolidated.
地层压力越高临界生产压力越低，因而越不易出砂。
Meanwhile, high formation pressure will reduce the possibility of sand production.
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