完井是指人們在鑽井作業完成後,讓油井做好生產準備的過程。這一過程主要包括安裝生產管英語Production tubing和相關的井下工具,以及根據需要進行穿孔。有時還包括套管的穿入和固井過程。在鑽井之後,如果鑽井液被清除,油井最終會自我封閉。套管可以確保這種情況不會發生,同時還可以保護井流不受外部侵入物(如水或沙)的影響。 [1]

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