逐级封堵水泥封井技术

油田老区二次加密开发,需对一部分低效井进行封堵,而笼统封井封堵成功率低,不能满足老区开发需求,为此,开展了逐级封堵水泥封井技术研究。研制了Y441-112封隔器、丢手接头及注水泥器等工具,实现了逐层封堵、逐级丢手功能,保证了水泥浆高效安全注入工艺管柱。该工艺消除了笼统挤注封井因层间压力差异引起的水泥注入不均、封堵效果不好的问题。目前该工艺共现场应用34口井,成功率100%,封堵效果较好,满足了老区二次改造需求。

Research on cement capping technique of progressive plugging

For the purpose of secondary infill development of original area of oilfield, some low-efficiency wells shall be plugged, while the low success rate of general plugging cannot meet the demand for development of original area. To solve this problem, the cement capping technique of progressive plugging is developed. Y441-112 packer, release sub and cement injector are developed to realize the function of plugging in layers and progress release and ensure that the cement slurry is injected into the process pipe string efficiently and safely. This technique solves the problems of uneven cement injection and bad plugging effect caused by interlayer pressure difference resulting from general squeeze and injection for shut-in. Currently, this technique has been applied in 34 wells and the success rate is 100%, with good plugging effect and meeting the demand for secondary reconstruction of original area.