近年来,侧钻井在塔河油田的比例在逐年增加,为满足部分侧钻井的地质避水要求,通常采取从石炭系巴楚组或奥陶系上部桑塔木组泥岩段进行开窗侧钻。但泥岩在钻井液的浸泡下易发生坍塌、掉块等不稳定情况,而且所钻遇石炭系与奥陶系地层压力相差较大,为了能够安全钻进,需要下一层技术套管进行封隔上部不稳定泥岩段。本文详细介绍了Ф139.7mm膨胀管在TH10233CH井的应用。 In recent years, the proportion of lateral drilling wells in Tahe Oilfield has been increasing year by year. In order to meet the geological water-avoidance requirements of some side-drilled wells, lateral drilling is usually carried out from mudstone sections of Bachu Formation or upper Ordovician upper Santam Group . However, the mudstone prone to collapse under the immersion of the drilling fluid, falling blocks and other instability, and the drilling Carboniferous and Ordovician strata differ greatly in pressure, in order to be safe drilling, the need for the next layer of technical casing for sealing Upper unstable mudstone section. This article describes in detail the application of Ф139.7mm expansion pipe in TH10233CH well.