涪陵页岩气井长水平段漏失井固井技术应用研究

Application Study on Cementing Technology for Absorption Well in Long Horizontal Section of Fuling Shale Gas Well

涪陵页岩气井钻井过程中井漏频繁,类型多样,严重影响了工程质量,特别是三开长水平段发生漏失油基钻井液甚至固井时发生漏失,影响了固井质量及后期页岩气的开采。针对长水平段漏失井特点,研究了一系列井眼准备技术、高效纤维隔离液封堵技术、管外浆柱结构优化技术、漏失井固井压稳技术,增强堵漏性能,提高固井质量。随着区域不断地扩大,地质情况复杂多变,提出了下一步的研究方向及建议。

Various types of lost circulation occured frequently in Fuling shale gas well drilling, which seriously impacted the engineering quality, especially the oil - based drilling fluid leakage happened in the third segment of long horizontal section and even in cementation stage, both cementation quality and late shale gas exploitation were affected. In view of the characteristics of absorption well, a series of borehole preparation techniques, high performance fiber, spacer fluid plug- ging, optimal outside pipe slurry column structure, wall Stability under pressure for absorption well cementation were studied to improve plugging performance and cementation quality. With enlargement of the exploitation area, the geological conditions will be more complicated, the paper puts forward the further research direction and the suggestion.