川西地区水平井下套管复杂情况分析及改进措施

Casing RIH Difficulties and Improvement Measures for Horizontal Wells in Western Sichuan Province

摘要:

在钻完井过程中，水平井下套管至水平段遇阻卡情况普遍存在，极端情况甚至出现套管卡死的现象。川西地区地质情况较为复杂，水平井下套管难度大，复杂情况多。本文通过对多口典型井下套管遇阻情况和原因进行分析，得出套管遇阻卡情况主要分为：突然遇阻和阻力渐增导致阻卡两种情况，并针对这两种情况提出了相应的改进措施。

Abstract:

During the drilling and well completion process, sticking often occurs when casing is run into the horizontal section during RIH of casing, and in some extreme cases casing may be tightly stuck. It is much more serious in western Sichuan due to relatively complex geological conditions. Analysis of some typical sticking cases and their causes leads to the following conclusion: there are 2 main types of sticking: sudden sticking and sticking due to increasing resistance; and the relevant improvement measures are put forward.