岩心钻探经常钻遇的孔内复杂情况之一是钻进松散,松软和水敏性的地层。在钻进中,如果泥浆类型选择不当,泥浆性能与地层不相适应,就往往发生孔壁缩径、塌陷崩落、钻头泡包、粘附卡钻等孔内事故,不但严重的影响钻探效率,而且造成经济的重大损失。为了拟制水敏性地层的水化膨胀和塌陷崩落,达到安全钻进之目的,就必须改善泥浆性 Core drilling One of the most complicated holes encountered during drilling is loose, soft, and water-sensitive formations. During the drilling, if the mud type is not properly selected and the mud performance is not compatible with the formation, pore borehole shrinkage, collapse caving, bit blister, sticking stuck drill and other holes often occur, which not only seriously affect the drilling efficiency, But also caused great economic losses. In order to simulate hydration expansion and collapse collapse of water-sensitive formations and achieve the purpose of safe drilling, it is necessary to improve the muddy nature