Patent ID: 7204306
Filing Date: 2007-04-17
Classification: E21B

Abstract:
1. A device for installation of profile liners, the device comprising a plurality of in-series connected mandrel assemblies, including a lower mandrel assembly and an upper mandrel assembly, each of the plurality of mandrel assemblies including: (i) a housing with a central straight-through channel and a plurality of inclined slots, (ii) a rod accommodated in the central straight-through channel of the housing, (iii) a plurality of rams mounted in the inclined slots of the housing, and (iv) a plurality of pushers mounted tightly in the housing, the plurality of pushers being disposed such that the rod interacts with the plurality of rams through the plurality of pushers; wherein the rams of each of the plurality of mandrel assemblies are disposable in either a working position or a non-operating position, the rod of the lower mandrel assembly being spring-loaded to bias the plurality of rams of the lower mandrel assembly to the working position and the rod of the upper mandrel assembly being spring-loaded to bias the plurality of rams of the upper mandrel assembly to the non-operating position, wherein each of the plurality of mandrel assemblies, in its working position, circumscribes a circle having a maximum diameter, the maximum diameter of the circle circumscribed by the upper mandrel assembly being greater than the maximum diameter of the circle circumscribed by the lower mandrel assembly.