Ball-casting hydraulic sizing collar
A grading hoop, hydraulic type technology, applied in the field of grading hoop, can solve the problems that affect the smooth progress of well completion operations, shut down the hole in advance, and inconvenient on-site operation, and achieve the effect of ensuring permanence, reasonable structure and convenient use
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[0016] The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.
[0017] In the present invention, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout of the accompanying drawing 1 of the specification. The layout direction of the graph is determined.
[0018] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:
[0019] As shown in accompanying drawing 1, this pitching hydraulic type grading hoop comprises mandrel 1, outer cylinder 2, upper joint 7 and lower joint 18; The inner side and the outer side of the lower part are fixedly installed together; the outer side of the lower end of the mandrel 1 and the inner side of the lower end of the outer cylinder 2 are fixedly ins...
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