Downhole expandable bore liner-filter
First Claim
1. A downhole expandable bore liner and well screen assembly comprising:
- a tubular base-pipe, the base-pipe having a central axis, a pipe-length and a tube wall with the tube wall having a plurality of through perforations for passing fluids, a filter-cover covering an outside tube-surface of the base-pipe, the filter-cover made of a compressible/self-expanding filter material and having a compressed-thickness, an expanded-thickness, a compressed outer-diameter and an expanded outer-diameter;
a plurality of runners disposed at the outer cover-surface, the runners in a spaced relationship to each other and extending the pipe-length of the base pipe; and
constriction means holding the runners in spaced relationship to each other and the filter-cover in a compressed configuration.
1 Assignment
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Accused Products
Abstract
A downhole expandable bore liner and well screen filter assembly has a perforated tubular base-pipe overlain with a self expanding filter-cover. A set of runners or bumpers extends the length of the outside of the filter-cover. A releaseable constriction mechanism holds the liner/filter assembly in a compressed configuration during insertion of the assembly down a well bore to facilitate insertion of the liner/filter assembly into its downhole position. Once positioned downhole in the well bore, the mechanism is released, and the liner/filter assembly takes its expanded or uncompressed configuration and interfaces with the walls of the well bore. In its uncompressed configuration, the liner/filter assembly can contact and press against the walls of the well bore, which contact serves to stabilize the assembly and to center it in the downhole well bore. The resilient and malleable nature of the filter material of the filter-cover can engage and at least partially fill and stabilize the irregularities in the formation wall of the well bore. Additionally, the resilient and malleable nature of the filter material of the filter-cover allows the assembly to utilize an expandable base-pipe in complement with the expandible filter material.
41 Citations
18 Claims
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1. A downhole expandable bore liner and well screen assembly comprising:
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a tubular base-pipe, the base-pipe having a central axis, a pipe-length and a tube wall with the tube wall having a plurality of through perforations for passing fluids, a filter-cover covering an outside tube-surface of the base-pipe, the filter-cover made of a compressible/self-expanding filter material and having a compressed-thickness, an expanded-thickness, a compressed outer-diameter and an expanded outer-diameter;
a plurality of runners disposed at the outer cover-surface, the runners in a spaced relationship to each other and extending the pipe-length of the base pipe; and
constriction means holding the runners in spaced relationship to each other and the filter-cover in a compressed configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification