Packer washout assembly

a technology for washing out and packing tools, which is applied in the direction of sealing/packing, fluid removal, borehole/well accessories, etc., can solve the problems of preventing the release of packing tools, time-consuming and expensive procedures, and the need for improved tools to be cost-effective and substantially maintenance-fr

Inactive Publication Date: 2007-03-22
WITCHER HAROLD L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A concern of well operators when setting a retrievable packer is the possibility of debris, such as sand, shale, or rust, settling on top of the packer and prohibiting the release of the packer.
Finally, if all the a...

Method used

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Examples

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Embodiment Construction

[0012] Referring now to FIG. 1, a packer washout assembly 10 constructed in accordance with the present invention for removing debris, such as sand, silt, shale, and rust, from the top of a packer 20 to permit the packer to be released is schematically illustrated. A well bore 12 is shown to be lined with a casing 14 extending down from a wellhead 15. The casing 14 provides a permanent borehole through which production operations may be conducted. The casing 14 is affixed in the well bore 12 in a conventional manner, such as by cement (not shown), and is provided with perforations 16 open to a producing subterranean formation 17.

[0013] The packer washout assembly 10 includes a tubing string 18, a packer 20, and a packerwashout sub 22. The tubing string 18 provides fluid communication between the producing subterranean formation 17 and a surface 24 such that a reservoir fluid (not shown), for example oil and / or natural gas, is produced through the tubing string 18. The casing 14 a...

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PUM

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Abstract

A packer washout assembly for removing debris from a well bore is disclosed. The packer washout assembly includes a tubing string positioned in the well bore and forming an annulus with the well bore. A packer is interposed in the tubing string and is sealable against the interior of the well bore. A packer washout sub is connected to an upper end of the packer. The packer washout sub includes a mandrel having at least one fluid flow port extending through a sidewall and a rupture disk positioned in the fluid flow port of the mandrel. The rupture disk is adapted to rupture upon the application of a predetermined pressure within the fluid passage of the mandrel so as to place the fluid passage in fluid communication with the annulus to permit fluid to pass through the fluid port from the mandrel to the annulus and thereby circulate fluid over the top of the packer so as to wash debris from the top of the packer.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates generally to an apparatus for washing debris from a well bore, and more particularly, but not by way of limitation, to an apparatus and method for washing debris from a packer set in a well bore to permit the packer to be released. [0003] 2. Brief Description of Related Art [0004] Packers are downhole tools widely used in the completion of oil and gas wells to isolate and control producing and injected fluids. A variety of packers are known. Packers are often classified as either permanent or retrievable. A permanent packer is recovered from the well bore by using milling tools, while a retrievable packer is designed to be released and retrieved on the production tubing or on a workstring. [0005] A concern of well operators when setting a retrievable packer is the possibility of debris, such as sand, shale, or rust, settling on top of the packer and prohibiting the release of the packer...

Claims

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Application Information

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IPC IPC(8): E21B37/00
CPCE21B33/12E21B31/03
Inventor WITCHER, HAROLD L.
Owner WITCHER HAROLD L
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