Seismic Explosive System

a technology of explosive system and seismic charge, which is applied in the field of explosive system, can solve problems such as the detonation of seismic charg

Inactive Publication Date: 2012-07-19
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This actuation voltage causes detonation of the Detonating Device which in turn causes detonation of the seismic charge.

Method used

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Embodiment Construction

[0017]It will be appreciated that the present invention may take many forms and embodiments. In the following description, some embodiments of the invention are described and numerous details are set forth to provide an understanding of the present invention. Those skilled in the art will appreciate, however, that the present invention may be practiced without those details and that numerous variations and modifications from the described embodiments may be possible. The following description is thus intended to illustrate and not to limit the present invention.

[0018]In this specification and the appended claims: (a) the term “Detonating Device” means a device which contains only secondary explosives and which when detonated causes a seismic charge to detonate. Examples of a Detonating Device include EBWs, EFIs and SBC slapper detonators; and (b) two items are “operative coupled” if they are directly connected or connected through an intermediate device.

[0019]With reference first to...

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Abstract

An explosive package is provided for use in seismic exploration which comprises a seismic charge and an addressable switch for selecting that seismic charge for detonation. A fireset is operatively coupled to the addressable switch for receiving a firing voltage via the addressable switch and for producing an actuation voltage. The actuation voltage may, for example be produced by increasing the magnitude of the firing voltage. The actuation voltage is provided to a Detonating Device, which is a device that contains secondary explosives. Examples of a Detonating Device include an exploding bridge wire detonator, an exploding foil initiator detonator and a semiconductor bridge slapper device. Such explosive packages may be arranged in a system for use in seismic exploration which comprises a base unit for providing selection, firing and trigger signals and a plurality of explosive packages that are located at spaced intervals along the earth's surface.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an explosive system for seismic charges which is safe from detonation by radio frequency (RF) signals and electrostatic discharge (ESD).[0003]2. Description of the Prior Art[0004]The current art of explosive seismic exploration relies on fast-acting electric detonators that typically function in less than 1 millisecond, and up to 1,000 detonators may be fired essentially simultaneously by a relatively low-voltage capacitor discharge. Because of their fast action, seismic electric detonators rely on a very sensitive primary explosive like lead styphnate, lead azide and diazodinitrophenol (DDNP). These seismic electric detonators can never be considered totally safe because they may be actuated by electrostatic discharge or stray voltage and are also susceptible to actuation by stray current and distant lightning strikes.[0005]Accordingly, for safety reasons, seismic charges are currently ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F42B3/12F42B3/10F23Q21/00
CPCF42D1/055F42B3/18F42C15/42F42D1/045G01V1/06G01V1/104
Inventor KNEISL, PHILIP
Owner SCHLUMBERGER TECH CORP
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