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1. 发明授权

US5007479A Hydraulic up-down well jar and method of operating same 失效
标题翻译：液压上下井及其操作方法
公开(公告)号：US5007479A
公开(公告)日：1991-04-16
申请号：US423483
申请日：1989-10-11
申请人： Charles W. Pleasants , Keith W. Scott
发明人： Charles W. Pleasants , Keith W. Scott
IPC分类号： E21B31/113
CPC分类号： E21B31/113
摘要： A hydraulic jar for use in a well and a method of operating same in which an outer housing assembly extends around an inner mandrel assembly in a coaxial relation thereto to define two fluid chambers separated by a piston. The housing assembly is movable relative to the mandrel assembly to force the fluid from one of the chambers to the other. The fluid flow rate is varied between a relative low flow rate and a relative high flow rate in response to the relative position of the housing assembly causing corresponding movement at the latter assembly. A high impact load is transferred to a member connected to the jar in response to a movement at the relatively high flow rate. The jar can be used to create a high impact load in both an upward direction and a downward direction.
摘要翻译：一种用于井中的液压缸及其操作方法，其中外壳组件围绕内心轴组件以与其同轴的关系延伸以限定由活塞分隔的两个流体室。壳体组件相对于心轴组件是可移动的，以迫使流体从一个腔室到另一个腔室。响应于壳体组件的相对位置引起在后一组件处的相应运动，流体流速在相对低的流速和相对高的流量之间变化。响应于相对较高流速的运动，高冲击载荷传递到连接到罐的构件。罐子可用于在向上方向和向下方向上产生高冲击载荷。

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