CAJ | 학술논문

护壁技术是解决复杂地层钻探难题的关键技术之一。介绍了一些特殊的套管护壁技术在WFSD-4号孔钻探中的应用情况，包括在小间隙条件下下大直径套管技术、复杂钻孔活动套管护壁取心技术和用于强缩径地层的两阶段下套管固井技术等。
호벽기술시해결복잡지층찬탐난제적관건기술지일。개소료일사특수적투관호벽기술재WFSD-4호공찬탐중적응용정황，포괄재소간극조건하하대직경투관기술、복잡찬공활동투관호벽취심기술화용우강축경지층적량계단하투관고정기술등。
Borehole wall protection is one of the key technologies for resolving drilling problems in Complex Strata.This pa-per introduces some special casing adopted in the drilling operation of the borehole WFSD-4, including large diameter cas-ing technology in small clearance condition, retrievable casing technology for small diameter core drilling in existing large borehole and two phase casing and cementing technology used in strong borehole shrinkage section.