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Downhole tool string

Inactive Publication Date: 2019-07-18
QINTERRA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a method for safely severing a tubular structure in a well, such as a drill pipe string, without damaging the downhole equipment. This is achieved by using a pipe-severing tool that is triggered to cut the tubular structure at a specific point in time, creating a shockwave that is protected from harming the remainder of the downhole tool string. The method allows for higher amounts of explosives or chemicals to be used for better severing without damaging the main components in the downhole tool string. The method also includes steps of triggering the pipe-severing tool, removing the free pipe from the well, and lowering the upper part of the downhole tool to the pipe-severing tool for re-use. Overall, the invention ensures safe and efficient removal of tubular structures from wells.

Problems solved by technology

This results in costly downtime, ranging anywhere from several thousands of dollars up to several millions of dollars per day of downtime, therefore it is critical to resolve the problem as quickly as possible.

Method used

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Examples

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Embodiment Construction

[0040]It should be noted that the above-mentioned and below-discussed embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb “comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article “a” or “an” preceding an element does not exclude the presence of a plurality of such elements. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

[0041]FIG. 1 shows an embodiment of the downhole tool string 100 in accordance with the invention. This embodiment uses a drill collar-severing tool, but the invention is not limited to such severing tool. T...

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Abstract

The invention relates to a relates to a downhole tool string wherein the upper part of the string includes a release tool for releasably coupling with a pipe-severing tool.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is continuation of U.S. application Ser. No. 15 / 536,489 filed Jun. 15, 2017 which is the National Phase of PCT Application No. PCT / NO2015 / 050244 filed 15 Dec. 2015, which claims priority to Norwegian Patent Application No. 20141536 filed 19 Dec. 2014, each of which is incorporated herein by reference.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH[0002]Not applicableNAMES OF THE PARTIES TO A JOINT RESEARCH AGREEMENT[0003]Not applicableREFERENCE TO A SEQUENCE LISTING[0004]Not applicableBACKGROUND OF THE INVENTION[0005]The invention relates to a method for recovering a tubular structure from a well, and in particular to a method for recovering a stuck drill pipe from a well, particularly a highly deviated or horizontal well. The invention further relates to a downhole tool for use in such method.[0006]Pipe recovery operations are used in drilling operations in the oil and gas industry, where the drill string can become stu...

Claims

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Application Information

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IPC IPC(8): E21B29/00E21B29/02E21B23/01
CPCE21B29/002E21B29/02E21B23/01E21B2023/008E21B23/001
Inventor ARNALY, GEORGES EMILE
Owner QINTERRA TECH
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