CAJ | 학술논문

汶川地震断裂带科学钻探工程钻遇地层非常复杂，地层破碎、膨胀缩径，坍塌、掉块严重，多次出现卡埋钻等事故，同时复杂地层取心率偏低。 WFSD-2孔在取心率很低井段，为补取岩心运用套管开窗侧钻技术；而在WFSD-4孔施工中，套管内出现卡钻事故，为绕障采用套管开窗侧钻技术。介绍了复杂事故井套管开窗侧钻从准备到实施的工艺流程和技术措施。套管开窗侧钻的成功应用为后续工程实施节约了时间和成本，对今后类似作业具有很好的指导和借鉴作用。
문천지진단렬대과학찬탐공정찬우지층비상복잡，지층파쇄、팽창축경，담탑、도괴엄중，다차출현잡매찬등사고，동시복잡지층취심솔편저。 WFSD-2공재취심솔흔저정단，위보취암심운용투관개창측찬기술；이재WFSD-4공시공중，투관내출현잡찬사고，위요장채용투관개창측찬기술。개소료복잡사고정투관개창측찬종준비도실시적공예류정화기술조시。투관개창측찬적성공응용위후속공정실시절약료시간화성본，대금후유사작업구유흔호적지도화차감작용。
During the drilling operation of Wenchuan earthquake fault science drilling project (WFSD), due to stratum breaking, borehole shrinkage and borehole walls'collapse, drilling accidents occurred frequently and core recovery has been low.In the borehole section of WFSD-2, where the core recovery was poor, sidetracking technology was used to get better core recovery and core quality.During the drilling of WFSD-4 hole, pipe stuck accidents occurred within the casing, cas-ing sidetracking technology was used to by pass the obstacle in the hole.This article describes the casing sidetracking tech-nology used in complex formations, referring to the technical measures adopted from preparation to implementation period. The successful application of sidetracking save project implementation time and cost, this will be good guidance and refer-ence for future similar operations.