三层管底喷取心钻具在海相第四系和新近系中的应用

Application of Sampling Drilling Tools of Three Layer Pipes in the Marine Quaternary System

摘要:

在海相第四系和新近系地层中钻进存在流塑、软塑等淤泥地层取心困难，砂层中堵心、被冲刷、样品扰动等现象时有发生。针对上述问题，设计了三层管底喷取心钻具，并在施工中加以改进。通过在南黄海科钻CSDP-2孔第四系、新近系中施工验证，证明该钻具具有很好的取心效果。

Abstract:

If wanting to get the ideal coring effect in the quaternary system and neogene , you must overcome the coring difficulties during drilling in flow model, RuanSu silt stratum , which are core block,washing out and disturbed samples etc. in the sand,Three layer tube coring drilling tool with bottom jet bit is mainly designed for quaternary loose and neogene, weak formation coring drilling and the structure is improved during drilling. The drilling tool is tested in the East China Sea the CSDP-2 holes in the quaternary, and it shows that the newly improved structure of the drilling tool could obtain the very good coring effect.