下套管失返性漏失正注反挤置换法工艺技术

Normal injection and reverse squeeze displacement process for lost return leakage in RIH of casing

摘要:

柳杨堡气田水平井二开下套管基本上都会出现失返性漏失，主要表现在下套管过程中虽然采取分段循环措施，仍然会在下至2800～3100 m井段出现不返浆。现场采取套管直接下入井底，然后应用正注反挤置换法沟通建立正常循环，保证正常固井，有效解决了套管固井井漏施工难题，同时为在其他区块解决类似情况探索了一套工艺技术。

Abstract:

In Liuyangbao Gas Field， lost return leakage generally occurs in the horizontal well during running casing through the horizontal section. This is mainly reflected in the fact that drilling slurry will not return out of the well when casing is set from 2800 to 3100m， though staged circulation is adopted. In the field， casing was directly run to the bottom of the well， and then the normal injection and reverse squeeze displacement method was used to establish circulation to ensure normal cementing. The method has solved effectively the problem of lost circulation in casing cementing， and provides solution for the similar situation in other blocks．