CAJ | 학술논문

在大口径深井取心钻进施工中，为了提高钻进效率、改善钻柱受力条件、封隔不稳定地层等，经常会下入活动套管。由于深井地层复杂、应力较大，井斜和井壁稳定性不易控制，如何保证安全、顺利地起、下活动套管，防止活动套管事故便成为施工中的突出问题。着重介绍了在施工过程中下入活动套管的技术方法及相关措施，并就施工过程中可能出现的相关问题提出了解决办法和思路。
재대구경심정취심찬진시공중，위료제고찬진효솔、개선찬주수력조건、봉격불은정지층등，경상회하입활동투관。유우심정지층복잡、응력교대，정사화정벽은정성불역공제，여하보증안전、순리지기、하활동투관，방지활동투관사고편성위시공중적돌출문제。착중개소료재시공과정중하입활동투관적기술방법급상관조시，병취시공과정중가능출현적상관문제제출료해결판법화사로。
The retrievable casing is often used for coring drilling in large diameter deep well construction to increase the drilling efficiency, improve the loading conditions of drill string and seal unstable strata.Because of the complex strata, the large stress and the difficulties in controlling the wall inclination and stability, the prevention of retrievable casing accident is important.The paper introduces the methods of retrievable casing lowing and the relative measures, puts forward the so-lutions to the related problems that may arise in the construction process.