Self conforming screen

A technology for screens and adaptable materials, which is applied in wellbore/well components, production fluids, earthwork drilling and production, etc. It can solve the problem that the screen has annulus gap, does not want solid output, and can expand the outside of the screen Issues such as limited size

Active Publication Date: 2008-05-07
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, if there is an empty area, the same problem exists that the flexible expander has a limited outer dimension to expand the screen outwards.
Therefore, when using flexible expanders, there is still the problem of leaving annulus gaps on the outside of the screen, which can result in the production of unwanted solids when the well is producing from this zone

Method used

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  • Self conforming screen
  • Self conforming screen

Examples

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Embodiment Construction

[0011] Figure 1 shows a portion of a length of screen 10 . It has a base pipe 12 above which is a screen 14 above which is an external adaptation layer 16 . Layer 16 has a plurality of holes 18 . The base pipe 12 also has holes 20 . The actual filter material or screen 14 may be a wire mesh or fabric or other known filter products. The conforming layer 16 is preferably soft so that it will flow when the screen 10 expands. Preferred materials are those that swell when exposed to wellbore fluids for an extended period of time. Three examples are nitrile, natural rubber and AFLAS. In an alternative embodiment, the compliant layer 16 expands sufficiently to contact the wellbore after placement in the wellbore without the screen 10 expanding. Shown schematically at ends 22 and 24 of screen 10 are snap rings 26 and 28 . As the screen 10 expands, these stop rings will restrain the compliant layer 16 to prevent longitudinal movement of the compliant layer 16 in the annulus outsi...

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PUM

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Abstract

A screen assembly has a material that conforms to the borehole shape after insertion. The assembly comprises a compliant layer that takes the borehole shape on expansion. The outer layer is formed having holes to permit production flow. The material that is selected preferably swells with heat a nd preferably comprises a shape memory foam that is thermoset. The base pipe ca n have a screen over it to act as an underlayment for support of the conformin g layer or alternatively for screening. The conforming layer can expand by itself or expansion can also occur from within the base pipe.

Description

[0001] priority information [0002] This application is a continuation-in-part of US Patent Application Serial No. 10 / 226,941 filed August 23,2002. technical field [0003] The technical field of the invention is downhole screens, and more particularly downhole screens that are expandable in openholes to seal off irregularly shaped wellbores. Background technique [0004] In the past, gravel packs on the outside of downhole screens have dominated sand control methods. The idea is to fill the annulus outside the screen with sand to prevent the production of unwanted solids from the formation. More recently, with the advent of pipe expansion techniques, it has been recognized that gravel packs would not be needed if the screens were expanded in situ to eliminate the surrounding annulus that was previously sand-packed. Due to the irregular shape of the wellbore, the use of screen expansion technology as an alternative to gravel packing has been problematic. Fixed expanders ...

Claims

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Application Information

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IPC IPC(8): E21B43/08
CPCE21B43/08E21B43/10E21B43/108E21B43/086E21B43/103E21B43/082
Inventor R·贝内特
Owner BAKER HUGHES INC
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