汶川地震断裂带科学钻探项目取心钻进技术

Coring Drilling Technology in Wenchuan Earthquake Fault Scientific Drilling Project

汶川地震断裂带科学钻探(WFSD)项目钻孔的主要目的之一是通过有效的技术手段,在极其破碎的地层中获取满足地学要求的原状岩心。通过在WFSD-2、WFSD-3两个钻孔采取隔液取心钻进、尖齿PDC小钻压取心钻进、孔底动力取心钻进、半合管无损出心等关键技术,高质量地达到了工程的取心要求,并有效地提高了难钻进、易堵心地层机械钻速和回次进尺。

Wenchuan earthquakeg Fracture Scientific Drilling （WFSD） was carrying out in the serious broken formation, one of the purposes is obtaining original cores to meet the geosciences requirements. Technologies of isolated fluid coring drilling, polycrystalline diamond compact （PDC） with sharp teeth and low drilling weight coring drilling, bottom hole pow- er coting drilling and split barrel undamaged coring were applied in WFSD - 2 and WFSD - 3. The results indicated that the rate of drilling speed and roundtrip footage were improved in the serious broken formation. Whatg even more important was that the high-quality original cores had been obtained by these improved drilling technologies.