套损井开窗侧钻水平井挖潜剩余油技术

Technique of tapping the potential of residual oil in casing damage wells based on side tracking

套损井开窗侧钻水平井技术是大庆油田针对套损井综合治理和长垣老区油田剩余油挖潜的需要开展的一项试验研究。该技术立足套损井区目的层精细描述的研究成果,采取相应的修井措施对高含水或低产液的套损井进行修井,确保开窗点以上套管完好,下部及射孔井段水泥有效封固。选定套损井段上部的完好套管开窗侧钻水平井钻开目的层。工艺包括套损井的选井选层和修井要求、开窗位置的确定、钻具及施工参数、水平井井眼轨迹控制及完井方式等。该技术作为一种修井、开窗侧钻、水平井钻井等多学科交叉的综合工艺,现场试验取得了较好的挖潜效果。为这类套损井的修复利用和老区开发后期的剩余油挖潜探索了一种新方法。

This is an experimental study carried out by Daqing Oilfield to meet the requirement of comprehensive treatment of casing damage wells and potential tapping of residual oil in old oilfields in Changyuan area. To ensure the casing to work well above the windowing point and the cementing to be sealed effectively below the windowing point and at the perforated interval, workover operation is conducted on the casing damage wells of high water cut or low fluid production, based on the research results of fine description of target zones in casing damage well blocks. Perfect casing above casing well interval is selected and side tracking is conducted in the target zone. The process includes the selection of wells and zones, the determination ofworkover requirements and windowing location, the drilling tools and operating parameters, the horizontal well track control and well completion ways. The technique is a comprehensive process combining well workover, side tracking and horizontal well drilling, and the potential tapping result obtained in the field test is satisfying. This provides a new method for the workover of similar casing damage wells and the potential tapping of residual oil at the production tail of old oilfields.