水平井管柱液压扶正器的研制与初步应用

Development and application of hydraulic centralizer for horizontal well

针对水平井管柱受重力效应影响,导致封隔器胶筒受力不均,密封性能下降,不能长期有效分隔水平井层段的问题,开展工艺技术研究,研制出了水平井管柱液压扶正器。通过地面模拟试验,对工具设计思路、加工材质、装配工艺及性能进行了验证。经现场试验及应用,该工具坐封扶正时能够确保水平井管柱处于居中位置,保证了封隔器的密封性能,满足有效分隔目的层段的要求;在释放扶正力时,可安全可靠撤回扶正机构,减少了修井作业时的安全隐患。适用于水平井、斜井及大位移井的分段压裂、堵水、注水等工艺施工,具有较高的推广应用价值。

The pipe string in horizontal well is affected by gravitational force,resulting in uneven stress on packer rubber,thus reduced its sealing property and made it incapable of long-term isolation for horizontal intervals.To solve this problem,hydraulic centralizer has been developed for horizontal well.The centralizer has been tested for design concept,material,assembly process and performance through model tests.Field test and application have shown that this tool can centralize the pipe string in horizontal well,ensure packer sealing property and effectively isolate target intervals.When the centralizing force is released,the centralizing mechanism can be withdrawn safely,thereby reduced risks in workover operation.This centralizer can be applied to multistage fracturing,water shutoff and water injection in horizontal well,deviated well and extended reach well,and is highly worth popularizing.