Wellbore anchor
AssigneeAtlantic Richfield Company
InventorWillie H. Thornton, Jr.
Life of this patent
Estimating the term…
Abstract
A wellbore anchor tool employing at least one pair of individual slip segments which wrap at least partially around a mandrel passing through the tool, the individual slip segments carrying bearing surfaces and restraint members for holding the slip segments in the tool but at the same time in slidable engagement with the tool.
Claims30
A wellbore anchor tool having a long axis, said tool comprising a mandrel extending along said long axis for at least part of the length of said tool, at least one pair of individual slip segments, each individual slip segment having first and second opposing sides, said first side having a plurality of slip wickers thereon, said second side having a cavity therein, said cavity extending along at least part of said second side so that each individual slip segment mates with and wraps partially around said mandrel along said long axis of said tool, said pair of slip segments in combination when mated with said mandrel in opposing relationship wrapping essentially around said mandrel, each individual slip segment having on its cavity side a slanted surface which extends away from said mandrel toward said first side thereby defining a sloping drive surface on said slip segment, said slanted surface and opposing mandrel defining a drive opening which narrows as said drive surface approaches said mandrel, at least one drive member carried by said mandrel, said drive member having a sloping surface which mates with said drive surface of said slip segments so that when said drive member is forced into said drive opening said slip segments are moved transverse to said long axis, each said slip segment carrying at least one retaining member for holding said slip segment in said tool and in slidable engagement with said tool.
A wellbore anchor tool having a long axis, said tool comprising a curvilinear mandrel extending along said long axis for at least part of the length of said tool, at least two pair of individual slip segments, each pair of individual slip segments being carried spaced apart from adjacent pairs along said mandrel, each individual slip segment having first and second opposing sides, said first side carrying a plurality of slip wickers, said second side having a curvilinear cavity that mates with said mandrel and extends along at least part of said second side so that each individual slip segment wraps partially around said mandrel along said long axis of said tool, each said pair of slip segments when mated with said mandrel in opposing relationship in combination wrap essentially around said mandrel, each individual slip segment having on its curvilinear cavity side a slanted surface which extends away from said mandrel toward said first side thereby providing a sloping drive surface on said slip segment and defining a drive opening between said drive surface and said mandrel which gradually narrows as said drive surface approaches said mandrel, a drive member carried by said mandrel adjacent the drive openings of each said pair of slip segments, each said drive member having a pair of sloping surfaces which mate with said drive surfaces of said adjacent pair of slip segments so that when each said drive member is forced into said drive openings of each pair of slip segments said pair of slip segments are moved away from said mandrel transversely to said long axis of said tool, each said slip segment carrying at least one retaining member for holding said slip segment in said tool and in slidable engagement with said tool.
In an individual slip segment having a long axis, first and second opposing ends, first and second opposing sides extending between said first and second ends, said first and second sides extending along said long axis, said first side extending essentially the full length of said segment and carrying a plurality of slip wickers along at least a portion of the length thereof, the improvement comprising said second side being composed of at least a first portion and a second portion, said first portion having first and second ends and extending along said long axis from said second end of said segment for a substantial length of said second side to said second end of said first portion, said second end of said first portion being intermediate said first and second ends of said segment, said second portion slanting from said second end of said first portion to a juncture point in the vicinity where said first side and said first end of said segment meet, said second side being further characterized by a cavity that extends along said long axis for at least the full length of said first portion, said cavity extending through at least said first portion so said segment can wrap partially around an elongate member which elongate member extends for at least the long axis length of said segment and penetrates said cavity through said second side.
Dependencies are inferred from the claim text.