岩心钻探中采用塑料管护孔方法

Plastic casing for Hole Protection in Core Drilling

摘要:

岩金钻探的某些浅部松散或胶结层，采用塑料管与钢套管配合护壁，即外层管用塑料管代替一次性投入使用，内层管沿用钢套管隔离保护，有效地降低了钻探成本，为“以塑代钢”综合治理复杂地层积累了经验。

Abstract:

Plastic casing is used to protect borehole wall cooperating with steel casing at some shallow loose orcemented layers, that is,plastic casing,is put into use as exterior casing in upper part of hole and steel casing is still used as inner tube for isolating protection.It reduces cost,and accumulates experiences for treating comples for-matiors with plastic instead of steel.