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Pump off junk mill

a junk mill and dump technology, applied in the direction of fluid removal, earth drilling and mining, borehole/well accessories, etc., can solve the problems of time-consuming and expensive, unable to function correctly, and merely operating a dedicated run for the purpose of clearing junk,

Inactive Publication Date: 2009-12-31
RODGERS TROY AUSTIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention is a device for removing junk from a well. It consists of a mill body and a milling core that can be separated by dropping a ball bearing and feeding water under pressure. The device has a movable collet for controlling the separation of the milling core from the mill body and a check valve inside the core. The technical effect of this invention is to provide a simple and effective tool for removing junk from a well."

Problems solved by technology

A significant disadvantage of this tool is that it must be positioned at the end of a work string and thus is typically used on a single run.
To operate a dedicated run merely for the purposes of clearing junk is both time-consuming and expensive.
Thus, when large debris is present the tool cannot function correctly and, in fact, generally shuts down into a mode that allows the fluid including the junk to by-pass the tool.
Additionally, junk tends to ‘ball-up’ at the scrapers or wipers as the larger pieces of junk are swept away from the inlet port up the annulus to become jammed or located around the wiper blades.

Method used

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Examples

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Embodiment Construction

[0018]This invention relates to a pump off junk mill that does not have to be removed from a downhole. The tungsten carbide mill has a full opening through the center with a back pressure valve and core which is connected to a string of tubing that latches into the system. A check valve assembly and the mill core is removed from the tubing by dropping a ball bearing down the tubing and then pumping fluid. A collet located in the milling core is urged to shift, allowing the milling core and its components to be released and drop to the bottom leaving the mill body in tact with the tubing string.

[0019]Thus, the mill body can be used for future cleanouts without removing it from the tubing string.

[0020]Existing mills must be pumped off entirely which leaves the mill as “junk” in the well in addition to junk hanging up in perforations, all of which can result in blocking the well. With existing mills, the premature releasing of the mill prior to the completion of the drilling process ca...

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PUM

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Abstract

A device for removing junk from a well by attaching to a tubing string a mill body with a removable milling core and lowering the assembly into a well. A movable collet and check valve are located in the milling core. The milling core can be separated from the mill body by dropping a ball bearing into the tubing and then feeding water under pressure into the tubing behind the ball bearing.

Description

REFERENCE TO RELATED APPLICATIONS[0001]This patent application claims the benefit of U.S. Provisional Application No. 61076089 filed on 26 Jun. 2008, the disclosure of which is incorporated herein in its entirety by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a downhole junk removal tool for use in removing junk from a well bore.[0004]2. Description of Related Art[0005]Pump off junk mills are used to remove various downhole obstructions, commonly referred to in the petroleum recovery industry as “junk.” Junk mills are frequently used to clean out various metallic and non-metallic obstructions that are in a downhole. Junk is anything that is not supposed to be in the downhole and can include various objects that are accidentally dropped downhole from the surface such as hand tools, wrenches, or parts that have broken off during drilling such as drill bit teeth, nozzles, etc., or accumulated cement or other sediment left b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B29/00E21B31/00
CPCE21B34/14E21B31/002
Inventor RODGERS, TROY AUSTIN
Owner RODGERS TROY AUSTIN