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Forced Annular Velocity Shoe for Wellbore Cleaning

IP.com Disclosure Number: IPCOM000241306D
Publication Date: 2015-Apr-15
Document File: 3 page(s) / 117K

Publishing Venue

The IP.com Prior Art Database

Abstract

Large ID Shoes are frequently needed for reverse circulating cleaning operations (e.g. with reverse circulating tool). Examples of this application would be cleaning debris from around a packer stem, or retrieving head for a retrievable bridge plug. Shoes are also sometimes used for cleaning debris off of the low side of the hole in deviated wellbores. The challenge to this application is that the large ID in the shoe required to geometrically put the debris in contact with the moving fluid, often results in lower than desired fluid velocity to effectively move the debris in the desired direction and remove it from the wellbore. The shoe design in this disclosure allows for increased fluid velocity without changing the OD geometry of the shoe. A shoe that contains a tubular fixed within its ID that creates a dead space in the center of the shoe, forcing the flow into the annular space between the tubular and the ID of the shoe. This 'forced annulus' has a much lower total flow area than the shoe itself, resulting in a higher fluid velocity through the shoe. This tubular can be sized specific to the application (e.g., to slide over a stem or allow a specific size of debris to into the annular space).

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Forced Annular Velocity Shoe for Wellbore Cleaning

Large ID Shoes are frequently needed for reverse circulating cleaning operations (e.g.  with reverse circulating tool).  Examples of this application would be cleaning debris from around a packer stem, or retrieving head for a retrievable bridge plug.  Shoes are also sometimes used for cleaning debris off of the low side of the hole in deviated wellbores.  The challenge to this application is that the large ID in the shoe required to geometrically put the debris in contact with the moving fluid, often results in lower than desired fluid velocity to effectively move the debris in the desired direction and remove it from the wellbore.  The shoe design in this disclosure allows for increased fluid velocity without changing the OD geometry of the shoe.

A shoe that contains a tubular fixed within its ID that creates a dead space in the center of the shoe, forcing the flow into the annular space between the tubular and the ID of the shoe.  This 'forced annulus' has a much lower total flow area than the shoe itself, resulting in a higher fluid velocity through the shoe.  This tubular can be sized specific to the application (e.g., to slide over a stem or allow a specific size of debris to into the annular space).