Unconsolidated sand reservoir always be buried not deep, because of it's low cementation and high content of clay and sundry, the unconsolidatedrock is easy to sanding during exploitation.
疏松砂岩气藏由于埋藏较浅、岩石胶结性差，并且粘土和杂基含量高，使得这类气藏在开采过程中容易出砂。
2
The reservoir rock of main oilfields in Bohai is unconsolidated and sand controls are needed, therefore, special technical problems must be resolved in production.
渤海主要油田的岩石胶结疏松，均需要防砂，因此，在开采中应对特殊的工艺问题进行攻关。
3
To drill soft, unconsolidated, usually shallow formations by eroding the "rock" below the bit by hydraulic impact loading alone.