| 摘要 |
<p>Device for carrying a replacement safety valve in a well tube, with a straddle structure for placement inside a damaged "Down Hole Safety Valve" nipple seal area. It is comprising a pair of sealing assemblies (15, 16) to be activated upon setting of the device to seal said nipple seal area, and a locking dog assembly (17) for locking the device in the well tube, said elements being carried by a tubular mandrel (12). At least one of the sealing assemblies (15, 16) comprises a expandable element (22; 34) being activated by a pair of annular press elements (19, 20).</p> |
