地下储气库多井眼重入封井技术研究及应用

老井封堵改造是储气库建设的基础核心工作，多井眼老井主要特征为同一井筒内有多个井眼，封井工艺复杂度更高，亟需一种快速可靠的封井手段。通过系统分析多井眼老井封堵面临的相邻井眼干扰、井眼状况不明、轨迹预测不准、测深存在偏差等技术难点，提出了基于国产无源磁导向工具的救援井防碰、测距、轨迹控制、录井技术一体化解决方案。在冀东油田海上储气库2口不同井况多井眼老井进行了现场试验，均顺利完成重入封井目标。该技术方案为储气库多井眼封井提供了完备的解决思路，具备良好的推广应用价值。

Research and application on re-entry well capping technology for multiple boreholes in underground gas storage

Capping and reconstructing old wells is the basic core work in gas storage construction. The main feature of multi-borehole old wells is that there are multiple boreholes in the same wellbore, and the capping process is very complicated, which urgently needs a fast and reliable well capping method. By systematically analyzing the technical difficulties faced by capping multi-borehole old wells, including adjacent borehole interference, unknown borehole status, inaccurate trajectory prediction, and deviation in sounding, a solution integrating rescue well anti-collision, ranging, trajectory control, and logging technology, which is based on domestic passive magnetic steering tools, was proposed. On-site tests were carried out in two old wells with different well conditions and multiple boreholes in the offshore gas storage in Jidong Oilfield, and the re-entry well capping target was successfully completed. This technical solution provides a complete solution for capping multiple boreholes in gas storage, and has good promotion and application value.