扩张式封隔器性能分析及试验研究

针对具有单向护肩结构的大扩张比封隔器入井测试问题进行了研究,由于该封隔器扩张比达到40%,远高于常规封隔器,为防止封隔器胶筒坐封过程中发生大的挤压变形和向上位移,在封隔器胶筒上端设计了护肩机构,而常规封隔器上环空试压方法不能验证护肩功能,并容易导致封隔器解封。为此对大扩张比封隔器实际坐封状态进行了有限元计算和地面测试,在此基础上设计了能够实现下环空测试封隔器性能的管串结构和试验工艺,并完成了入井试验。试验结果表明封隔器下环空试压达到18MPa,封隔器护肩坐封过程中能够胀开保护胶筒并在上提解封时实现收缩。研究所形成的计算及试验工艺方法实现了对封隔器工作状态的有效测试,为封隔器功能完善、结构改进提供了参考依据。

Performance Analysis and Experiment Research on Expansion Packer

Large expansion ratio expandable packer with one-way shoulder protector was researched for problem of field test.The expansion ratio is over 40%and more than other regular packers,so the shoulder protector structure was devised on the top of the packer to protect the rubber and improve the performances.The upper annular pressure test methodthat was commonly used could notget the performance of the shoulder protector structure fully,and make the pacer release.In order to resolve the problem,the setting and sealing examination process was computed and tested.Then the lower annular pressure test string was devised,which can test performance of the shoulder protector fully,and the experiment was completed.The sealing pressure was 18MPa and the shoulder protector worked well.So the method in the paper resolved the test problem of large expansion pacer,which is helpful for the devise and optimization of structure of the expansion pacer.