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Multiple point initiation for non-axisymmetric shaped charge

a multi-point initiation and charge technology, applied in the direction of explosive charges, fluid removal, borehole/well accessories, etc., can solve the problems of non-uniform collapse of liner, production flow to be stopped, and the typical complicated procedure of well abandonmen

Inactive Publication Date: 2018-07-19
DYNAENERGETICS EURO GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes an apparatus and method for creating a non-axisymmetric shaped charge that can collapses a liner evenly using a multiple initiation points. This charge is designed for use in perforating guns and includes a casing with optional guiding members. The technical effect of this invention is a more symmetrical and uniform collapse of the liner, which improves the performance and reliability of the perforating gun.

Problems solved by technology

Because round perforation holes have to be of a sufficient diameter in order to avoid bridging and screen out, holes of insufficient diameters leads to decreased flow which can cause production flow to be halted, which is costly.
Well abandonment typically involves complicated procedures where the wellbore must be shut in and permanently sealed using cement.
Since commercially available slot-shaped charges provide a side face or back end single initiation point, in addition to the aforementioned disadvantages associated with conically-shaped charges, the ballistic energy generated is often insufficient, resulting in a non-uniform collapse of the liner.
When this occurs, the wells and / or oilfield may not be properly closed.
As a result, groundwater contamination and / or threats to health, safety and the environment may occur.
It is less favorable for the detonation shock waves to be induced at a single point of initiation for such slot-shaped charges, particularly including the v-shaped inlay / liner due to the geometry of these charges.

Method used

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  • Multiple point initiation for non-axisymmetric shaped charge
  • Multiple point initiation for non-axisymmetric shaped charge
  • Multiple point initiation for non-axisymmetric shaped charge

Examples

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Embodiment Construction

[0024]Reference will now be made in detail to various embodiments. Each example is provided by way of explanation, and is not meant as a limitation and does not constitute a definition of all possible embodiments.

[0025]As used herein, the term “non-axisymmetric” means not axisymmetric as defined hereinabove, and includes non-circular and non-conical shapes. As an example, and with reference to the shaped charge found in FIG. 2, the distance between a point on the periphery of the body from the central axis y-y found at L3 is not equal to the distance found at L4. As used herein, the term “multiple” means more than one.

[0026]A non-axisymmetric shaped charge is generally described herein, having particular use in conjunction with a perforating gun assembly. In an embodiment, the non-axisymmetric shaped charge is configured for use with a perforating gun assembly, in particular for oilfield or gas well drilling or completions. The non-axisymmetric shaped charge provides multiple initia...

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Abstract

A non-axisymmetric shaped charge including a casing, such as a non-axisymmetric shaped casing, and a liner housed therein, is generally described in which the casing includes multiple initiation points extending in a planar arrangement along an external surface of the casing. The non-axisymmetric shaped charge may include a plurality of guiding members positioned on the external surface. The non-axisymmetric shaped charge is capable of creating sufficient ballistic energy to uniformly collapse the liner.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to PCT Application No. PCT / EP2016 / 069293 filed Aug. 12, 2016, which claims the benefit of U.S. Provisional Application No. 62 / 206,496 filed Aug. 18, 2015, each of which is incorporated herein by reference in its entirety.FIELD[0002]A non-axisymmetric shaped charge for use in a perforating gun, is generally described, wherein the non-axisymmetric shaped charge has multiple initiation points and a plurality of guiding members.BACKGROUND[0003]Perforating gun assemblies are used in many oilfield or gas well completions. In particular, the assemblies are used to generate holes in steel casing pipe / tubing and / or cement lining a well to gain access to the oil and / or gas deposit formation. These assemblies are usually cylindrical and include a detonating cord arranged within the interior of the assembly and connected to shaped charge perforators (or shaped charges) disposed therein. Typically, shaped charges are c...

Claims

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Application Information

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IPC IPC(8): F42B1/028E21B43/117F42B1/036F42B3/26
CPCF42B1/028E21B43/117F42B1/036F42B3/26F42B3/08
Inventor MCNELIS, LIAMSHAHINPOUR, ARASHMUELLER, JOERG
Owner DYNAENERGETICS EURO GMBH