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2. 发明授权

US5381631A Method and apparatus for cutting metal casings with an ultrahigh-pressure abrasive fluid jet 失效
标题翻译：用超高压磨料流体射流切割金属外壳的方法和装置
公开(公告)号：US5381631A
公开(公告)日：1995-01-17
申请号：US48659
申请日：1993-04-15
申请人： Chidambaram Raghavan , John Olsen , Curtis L. Anderson , Alton J. LaLande
发明人： Chidambaram Raghavan , John Olsen , Curtis L. Anderson , Alton J. LaLande
IPC分类号： B24C1/04 , B24C3/32 , B24C5/04 , E21B29/06 , E21B43/114 , B24C3/00
CPC分类号： E21B29/06 , B24C1/045 , B24C3/325 , B24C5/04 , E21B43/114
摘要： A method and apparatus for cutting metal casings with an ultrahigh-pressure abrasive fluid jet is shown and described. Examples of such casings include piles and conductors of offshore oil production platforms. In accordance with a preferred embodiment of the present invention illustrated herein, the apparatus is lowered inside the casing to be cut to a desired depth where it is secured to an inner surface of the casing. An ultrahigh-pressure stream of fluid is forced through a nozzle provided in a jet manifold of the apparatus to produce an ultrahigh-pressure fluid jet, into which a volume of abrasives is entrained, thereby generating an abrasive fluid jet. A drive mechanism is provided to rotate the abrasive fluid jet in a substantially horizontal plane to produce a circumferential cut in the casing. The abrasive fluid jet may also be moved in a vertical plane if necessary to complete the cut, for example if the initial cut is in the form of a helix. The performance of the jet is monitored by listening to the sound intensity of the jet with hydrophones.In accordance with the present invention, the cut in the casing may be made by the abrasive fluid jet in either a water or air environment, an air environment being created in a vicinity of the abrasive fluid jet by displacing a volume of water. The volume of abrasives may be entrained in the ultrahigh-pressure fluid jet by a vacuum created by the jet passing through the nozzle or, in an alternative embodiment, the abrasives may be entrained in a pressurized stream of a low density medium such that the pressurized abrasives are injected into the ultrahigh-pressure fluid jet.
摘要翻译：示出并描述了用超高压磨料流体射流切割金属壳体的方法和装置。这种壳体的实例包括海上石油生产平台的桩和导体。根据本文所示的本发明的优选实施例，该装置在被切割的壳体内部被降低到期望的深度，在该深度处固定到壳体的内表面。超高压流体流被强制通过设置在设备的喷射歧管中的喷嘴，以产生超高压流体射流，其中夹带有大量研磨剂，从而产生磨料流体射流。提供驱动机构以在大致水平的平面中旋转研磨流体射流，以在壳体中产生圆周切口。如果必要的话，研磨流体射流也可以在垂直平面中移动以完成切割，例如，如果初始切割是螺旋形式的话。通过用水听器监听射流的声强来监测射流的性能。根据本发明，壳体中的切割可以通过在水或空气环境中的磨料流体射流来制造，通过移动一定量的水而在磨料流体射流附近产生空气环境。研磨剂的体积可以通过由穿过喷嘴的射流产生的真空而夹带在超高压流体射流中，或者在替代实施例中，研磨剂可以夹带在低密度介质的加压流中，使得加压研磨剂被注入到超高压流体射流中。

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