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Self-Expanding Sand Retention Device

IP.com Disclosure Number: IPCOM000124463D
Publication Date: 2005-Apr-21
Document File: 3 page(s) / 189K

Publishing Venue

The IP.com Prior Art Database

Abstract

This relates to an expandable sand screen device constructed of a single sheet of hyperelastic or shape-memory material. The sheet is slit or perforated to a size compatible to the formation sand and rolled and welded into a tube. The resulting tube is folded and constrained to allow transport down hole. Once down hole, the constraint is removed and the tube takes on its original shape.

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Title: Self-Expanding Sand Retention Device

Authors: Matt Hackworth & Craig Johnson

                                                                          

Introduction

This relates to forming an expandable sand retention device from hyperelastic or shape-memory materials and then using trapped elastic energy to perform the expansion.

Summary

This relates to an expandable sand screen device constructed of a single sheet of hyperelastic or shape-memory material.  The sheet is slit or perforated to a size compatible to the formation sand and rolled and welded into a tube.  The resulting tube is folded and constrained to allow transport down hole.  Once down hole, the constraint is removed and the tube takes on its original shape.

Detailed Description

In order to achieve a through-tubing expandable system, very high expansion ratios are needed – on the order of 350%.  Thinking conventionally about expandable sand screens, it is possible to create a base pipe that expands 350% without much problem, especially one that uses the bistable concept.  A technical challenge here is transporting the filter media down hole.  By creating a single-layer, expanding structure from a hyperelastic material (such as a nickel titanium alloy), this is possible.  It can be made by:

 

  1. Cutting small slots or holes in a Ni-Ti sheet (at least 1 mm thick) whose opening size is appropriate to the formation sand.
  2. Rolling...