초록 ▼

A slip for an expanding hanger or patch is disclosed. The slip is mounted over the hanger body and has an internal profile that nests within a mating profile on the exterior of the hanger. When a compressive force is applied to the hanger, it shrinks longitudinally and as a result the slip is cammed

A slip for an expanding hanger or patch is disclosed. The slip is mounted over the hanger body and has an internal profile that nests within a mating profile on the exterior of the hanger. When a compressive force is applied to the hanger, it shrinks longitudinally and as a result the slip is cammed radially to the extent the inside diameter of the surrounding tubing permits. When the swage is advanced, the diameter of the hanger increases forcing the slip into preferably penetrating contact with the inside wall of the surrounding tubular.

대표청구항 ▼

We claim: 1. A downhole tool for engagement with an existing tubular downhole, comprising: a body having a longitudinal axis and defining an innermost bore therethrough said innermost bore also being the innermost bore of the tool; at least one slip mounted to said body, said body and slip insertab

We claim: 1. A downhole tool for engagement with an existing tubular downhole, comprising: a body having a longitudinal axis and defining an innermost bore therethrough said innermost bore also being the innermost bore of the tool; at least one slip mounted to said body, said body and slip insertable into the tubular downhole and defining a clearance therebetween, said slip actuated to move radially with respect to said longitudinal axis into initial or enhanced contact with the existing tubular in response to a longitudinal dimension change of said body resulting from stress from expansion of said body; the length of said body is reduced to move said slip radially; said slip is cammed radially when the length of said body is reduced. 2. The tool of claim 1, wherein: said radial movement of said slips due to said camming is limited by said clearance. 3. A downhole tool for engagement with an existing tubular downhole, comprising: a body having a longitudinal axis; at least one slip mounted to said body, said body and slip insertable into the tubular downhole and defining a clearance therebetween, said slip actuated to move radially with respect to said longitudinal axis in response to a longitudinal dimension change of said body resulting from stress from expansion of said body; the length of said body is reduced to move said slip radially; said slip is cammed radially when the length of said body is reduced; said slip and said body are engaged to each other using at least one projection on one of said body and said slip initially extending into at least one depression on the other of said body and said slip. 4. The tool of claim 3, wherein: said body comprises at least one shoulder, that is engaged by said slip when said reduction of body length causes said projection to move toward a more misaligned position with respect to said depression. 5. The tool of claim 4, wherein: wherein said body further comprises a recess, said slip is disposed substantially within said recess when said projection and depression are fully aligned. 6. The tool of claim 3, wherein: the maximum amount of camming of said slip due to shrinkage in length of said body, when not limited by said clearance, is defined by fully misaligning said projection and said depression. 7. The tool of claim 4, wherein: said slip comprises at least two slips and said shoulder comprises at least two shoulders, each said slip engaging a corresponding shoulder upon said longitudinal reduction in length of said body; said slips and their corresponding shoulders are arranged on said body in mirror image orientation on said body. 8. The tool of claim 4, wherein: said slip comprises at least two slips and said shoulder comprises at least two shoulders, each said slip engaging a corresponding shoulder upon said longitudinal reduction in length of said body; said slips and their corresponding shoulders are arranged on said body in the same orientation on said body. 9. The tool of claim 3, wherein: said at least one projection and said at least one depression comprise a plurality of paired projections and depressions. 10. The tool of claim 9, wherein: said body comprises at least one shoulder that is engaged by said slip when said reduction of body length causes said projection to move toward a more misaligned position with respect to said depression; said paired projections and depressions become more misaligned due to length reduction of said body, the further they are disposed from a fixed location on said body. 11. The tool of claim 4, wherein: said shoulder, when contacted by said slip as the length of said body is reduced assists in forcing said projection into misalignment with said depression to move said slip radially. 12. The tool of claim 7, wherein: said at least two slips comprise at least four slips with two arranged adjacent opposed ends of said body, whereupon expansion a portion of the downhole tubular is isolated. 13. The tool of claim 7, wherein: said mirror image orientation of said shoulders provides support to one slip when applied loads to said body in a first direction, when supported by said slip from the downhole tubular, and to another slip when applied loads are in a second direction opposite said first direction. 14. The tool of claim 3, wherein: said projection and depression have a generally trapezoidal cross-section further comprising generally parallel end surfaces such that, if sufficient clearance is initially available, said end surface of said depression on said slip exits said projection on said body and said slip obtains support off an inner surface resting on said end surface of said projection on said body.