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Packer Elements with Embedded Rings

IP.com Disclosure Number: IPCOM000202694D
Publication Date: 2010-Dec-22
Document File: 2 page(s) / 18K

Publishing Venue

The IP.com Prior Art Database

Abstract

Open hole packers with a small retracted OD and a large expanded OD are required. To function properly, these packers require very long and thin rubber elements which must be greatly compressed on one end in order to have sufficient rubber volume to expand and fill the drilled hole ID when set. For a long, thin, packer element to set properly; it is desirable for the anti-extrusion mechanism at the opposite end of the applied setting force to be set first. Therefore, force must be transferred through the rubber element to expand the backup. Also, the force must be transferred through the rubber element to radially expand the element itself in a controlled manner. By embedding properly sized and spaced rings in the rubber packer element, the combined compressive strength of the rubber packer element and the rings can be increased so that the rubber can be expanded and set in the desired controlled sequence.

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Abstract:

Open hole packers with a small retracted OD and a large expanded OD are required. To function properly, these packers require very long and thin rubber elements which must be greatly compressed on one end in order to have sufficient rubber volume to expand and fill the drilled hole ID when set. For a long, thin, packer element to set properly; it is desirable for the anti- extrusion mechanism at the opposite end of the applied setting force to be set first. Therefore, force must be transferred through the rubber element to expand the backup. Also, the force must be transferred through the rubber element to radially expand the element itself in a controlled manner. By embedding properly sized and spaced rings in the rubber packer element, the combined compressive strength of the rubber packer element and the rings can be increased so that the rubber can be expanded and set in the desired controlled sequence.

Description:

The invention disclosed is an improved high expansion packer element with embedded rings. The embedded rings may be made of Polytetrafluoroethylene (PTFE), metal, plastic, rubber, wire mesh, or other suitable compounds. Polytetrafluoroethylene is a preferred material for the rings because it is relatively inert and it has high elongation. The size and spacing of the rings may be varied by the packer designer to control the expansion of the rubber elements. For example, the rings may be close together at the end where the force to...