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在鑽进复杂的地层当中,除了采用适当的鑽进方法,如冲击鑽进、管下扩孔鑽进、特殊的冲洗液、止水混合液及凝固液以外,在很多情況下都须要依賴于下套管护孔,才能顺利地通过。当然在下套管时,操作最方便的乃是从孔口一直下到预期深度,但对—些深度大(或角度大),施工久的鑽孔成套的下入套管,也有一定的困难,如套管消耗大、难起拔等,而当遇到复杂地层时,又往往不可能一次成套下入套管,这时就需要根据具体情况采用埋套管或分段下入的办法。
In addition to drilling into complex formations, in addition to using appropriate drilling methods such as percussion drilling, reaming downhole drilling, special flushing fluids, stopwashing and coagulating fluids, in many cases depend on Under the casing protection hole, in order to successfully pass. Of course, in the next casing, the most convenient operation from the orifice down to the expected depth, but for some of the depth (or angle), the construction of a long set of drilling into the casing, there are some difficulties, Such as casing expensive, hard to pull, etc., and when encountered in complex formations, it is often impossible to complete a set of casing, then you need to use under specific circumstances buried casing or sub-approach.