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Resistor-based Ignition System for a Core Gun

a resistance-based ignition and core gun technology, applied in the field of resistor-based ignition systems for core guns, can solve the problems of b>hazardous to handle, negative safety issues with the current system, and b>hazardous to handle, and achieve the effect of eliminating safety risks

Inactive Publication Date: 2013-09-05
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a new way to make a core gun igniter assembly. The assembly uses a resistor that is welded onto a circuit, instead of being soldered. When the circuit is turned on, this resistor creates the heat needed to ignite the propellant, which then pushes the core barrel into the surrounding formation to get the desired sample. The use of a certain type of ignition mix is also eliminated, which makes the process safer.

Problems solved by technology

However there are several negatives and safety issues with the current system.
TK1 mix 12 is hazardous to handle when dry and is sensitive to electrostatic discharge, friction and impact.
The TK1 mix 12 is a fine titanium power which could be hazardous to handle in certain stages of manufacturing process.
The ignition mix 12 has in the past caused small fires and presented a personnel safety hazard when assembled into a cartridge 26.
Despite such risks core guns have been assembled with this dangerous ignition mix for many years.

Method used

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  • Resistor-based Ignition System for a Core Gun
  • Resistor-based Ignition System for a Core Gun
  • Resistor-based Ignition System for a Core Gun

Examples

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Embodiment Construction

[0012]FIG. 3a shows a resistor 48 that when energized creates heat to burn the propellant 50 in the cartridge 52. The resistor is preferably under 50 ohms and is secured at opposed ends with welds 54 and 56. The barrel 58 is secured by the tether 60 that operates in the same manner as in FIG. 1a. Additional barrels such as 62 can be used in the core gun body 64. The core sample of the formation 66 is captured in the passage 64.

[0013]Those skilled in the art will appreciate that the elimination of the nichrome wire coated with the ignition mix that had been in persistent use in the past for years for core guns posed safety issues that caused fires and threatened personal injury for the assembly workers. The soldering process for attaching the wire also created reliability issues with the possibility that the barrel would not be propelled into the formation.

[0014]Now the core gun with a welded resistor of preferably under 50 ohms to set off the propellant to launch the barrel, the ass...

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Abstract

A core gun igniter assembly features a resistor under 50 ohms that is welded rather than soldered to a circuit. Upon energizing the circuit, the resistor creates the heat needed to directly set off the propellant to directly drive the core barrel into the surrounding formation to obtain the desired core sample. The use of a titanium powder ignition mix on a nichrome wire with its attendant safety risks is eliminated.

Description

FIELD OF THE INVENTION[0001]The field of the invention is igniter systems for explosively operated subterranean tools and more particularly core guns.BACKGROUND OF THE INVENTION[0002]As shown in FIG. 1a, core gun cartridges have been manufactured for many years using Nichrome wire 10 coated with TK1 ignition mix 12 to ignite the main load of the propellant 14. However there are several negatives and safety issues with the current system. TK1 mix 12 is hazardous to handle when dry and is sensitive to electrostatic discharge, friction and impact. The TK1 mix 12 is a fine titanium power which could be hazardous to handle in certain stages of manufacturing process. The manufacturing process of TK1 12 is relatively a ill defined process and is left up to operator judgment to ensure a consistent product. Solder process sometimes fails do to cold solder joints.[0003]FIG. 1a shows the core barrel 16 tethered with a wire rope 18, a portion of which remains attached to the barrel 16 for retri...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B43/116
CPCE21B49/04
Inventor BRUNNER, GEORGE A.CANNON, EDWIN A.
Owner BAKER HUGHES INC
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