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在开发阿拉斯加塞克西部油田时,通过套管开窗下入扶正器多次失败,不仅浪费了时间,还浪费了扶正器。为了解决套管开窗后扶正器持续损坏问题,建立了模型并进行现场测试。文中列举了几种扶正器的损坏情况,模拟了通过套管窗口下入尾管的扭矩和拉力状况。需要把侧向载荷施加在尾管上,才能弥补弯曲对扶正器性能的影响,但扶正器出故障的几率更大,可以把扶正器只下到预测有尾管弯曲的地方。螺旋型扶正器为成功通过套管窗口提供了更大的机会。小外径多刮刀扶正器在性能上超过了大外径少刮刀扶正器。本文讨论了测试前安装扶正器应注意的问题,详细描述了施加在窗口处扶正器上的载荷模拟情况,列出了几种工业上常用的扶正器的现场测试结果。
In the development of the western Seychelles field in Alaska, the failure to open the centralizer through casing windows wastes time and wastes the centralizer. In order to solve the problem of continuous damage to centralizer after casing window opening, a model was established and tested on site. The article lists several types of centralizer damage, simulating the torque and tension conditions through the casing window into the tail pipe. The lateral load needs to be applied to the tail pipe to compensate for the effect of bending on the performance of the centralizer, but the centralizer is more likely to fail and the centralizer can only be lowered to where the tail pipe is predicted to be bent. Spiral centralizers provide a greater chance of successful passage through the cannula window. Small diameter multi-blade centralizer performance than the large diameter less scraper centralizer. This article discusses the issues to be noted when installing a centralizer prior to testing, details the simulated load imposed on the centralizer at the window, and presents field-tested results of several commercially available centralizers.