| 摘要 |
The invention provides a hydraulic anchor packer for use in a well bore comprising an inflatable packer element (36) incorporating a cylinder (38) and an elastomer sleeve (44) provided on the exterior surface thereof. The elastomer sleeve (44) is retained by retaining means adjacent the cylinder (38) at the end portions of the sleeve (44) but free of the cylinder (38) intermediate the end portions. An aperture (48) is defined by the wall of the cylinder (38) for connecting the exterior of the cylinder (38) in a region where the elastomer sleeve (44) is free thereof to the interior of the cylinder (38). The anchor packer further comprises means (60, 62) for causing fluid from within the cylinder (38) to flow through the aperture (48) and between the elastomer sleeve (44) and exterior surface of the cylinder (38). The means (60, 62) is thereby adapted to radially expand the elastomer sleeve (44). Means (56) is further provided for trapping fluid which has flowed into the chamber between the elastomer sleeve (44) and the cylinder (38) to prevent relaxation of the elastomer sleeve (44). The invention has the advantage over the prior art of providing a hydraulic anchor packer which is simple and inexpensive to manufacture and use, and which is suitable for use in both cased and uncased well bores.
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